Espruino Hardware Reference
The Espruino Interpreter runs on a variety of different hardware. Please click on the thumbnails below to see technical data on each board.
Official Boards
The official boards are designed specifically for the Espruino JavaScript interpreter. They come with Espruino pre-installed so are ready out of the box. Got a problem? We provide support on the Espruino forums.
![Bangle.js](img/BANGLEJS_thumb.jpg)
Bangle.js 📚
![Bangle.js 2](img/BANGLEJS2_thumb.jpg)
Bangle.js 2 📚
![Puck.js](img/PUCKJS_thumb.jpg)
Puck.js 📚
![Pixl.js](img/PIXLJS_thumb.jpg)
Pixl.js 📚
![MDBT42Q Module](img/MDBT42Q_thumb.jpg)
MDBT42Q Module 📚
![Original Espruino Board](img/ESPRUINOBOARD_thumb.jpg)
Original Espruino Board 📚
![Espruino Pico](img/PICO_R1_3_thumb.jpg)
Espruino Pico 📚
![Espruino WiFi](img/ESPRUINOWIFI_thumb.jpg)
Espruino WiFi 📚
Unsupported boards ▼
Espruino Software Reference
Version 2v21
Contents
- Globals
- AES
- Array
- ArrayBuffer
- ArrayBufferView
- Bangle
- BluetoothDevice
- BluetoothRemoteGATTCharacteristic
- BluetoothRemoteGATTServer
- BluetoothRemoteGATTService
- Boolean
- CC3000
- console
- crypto
- DataView
- Date
- dgram
- dgramSocket
- Dickens
- E
- Error
- ESP32
- ESP8266
- Ethernet
- File
- Flash
- Float32Array
- Float64Array
- fs
- Function
- Graphics
- heatshrink
- http
- httpCRq
- httpCRs
- httpSRq
- httpSRs
- httpSrv
- I2C
- Int16Array
- Int32Array
- Int8Array
- InternalError
- Jolt
- JSON
- Math
- Microbit
- Modules
- neopixel
- net
- NetworkJS
- NodeMCU
- NRF
- Nucleo
- Number
- Object
- OneWire
- Pin
- Pixl
- process
- Promise
- Puck
- Qwiic
- ReferenceError
- RegExp
- Serial
- Server
- Socket
- SPI
- Stepper
- Storage
- StorageFile
- String
- SyntaxError
- TelnetServer
- tensorflow
- TFMicroInterpreter
- tls
- tv
- TypeError
- Uint16Array
- Uint24Array
- Uint32Array
- Uint8Array
- Uint8ClampedArray
- Unistroke
- url
- Waveform
- Wifi
- WioLTE
- WIZnet
- WLAN
Globals
Methods and Fields
- variable __FILE__
- function acceleration()
- function analogRead(pin)
- function analogWrite(pin, value, options)
- variable arguments
- function atob(base64Data)
- Bluetooth
- function btoa(binaryData)
- function changeInterval(id, time)
- function clearInterval(id, ...)
- function clearTimeout(id, ...)
- function clearWatch(id, ...)
- function compass()
- function decodeURIComponent(str)
- function digitalPulse(pin, value, time)
- function digitalRead(pin)
- function digitalWrite(pin, value)
- function dump()
- function echo(echoOn)
- function edit(funcName)
- function encodeURIComponent(str)
- function eval(code)
- variable FET
- function getPinMode(pin)
- function getSerial()
- function getTime()
- variable global
- variable HIGH
- I2C1
- I2C2
- I2C3
- variable Infinity
- function isFinite(x)
- function isNaN(x)
- function load(filename)
- LoopbackA
- LoopbackB
- variable LOW
- variable NaN
- function parseFloat(string)
- function parseInt(string, radix)
- function peek16(addr, count)
- function peek32(addr, count)
- function peek8(addr, count)
- function pinMode(pin, mode, automatic)
- function poke16(addr, value)
- function poke32(addr, value)
- function poke8(addr, value)
- function print(text, ...)
- function require(moduleName)
- function reset(clearFlash)
- function save()
- variable SCL
- variable SDA
- Serial1
- Serial2
- Serial3
- Serial4
- Serial5
- Serial6
- function setBusyIndicator(pin)
- function setDeepSleep(sleep)
- function setInterval(function, timeout, args, ...)
- function setSleepIndicator(pin)
- function setTime(time)
- function setTimeout(function, timeout, args, ...)
- function setWatch(function, pin, options)
- function shiftOut(pins, options, data)
- function show(image)
- SPI1
- SPI2
- SPI3
- Telnet
- Terminal
- function trace(root)
- USB
- variable VIBRATE
variable __FILE__ ⇒
Call type:
variable __FILE__
Returns
The filename of the JavaScript that is currently executing
Description
The filename of the JavaScript that is currently executing.
If load
has been called with a filename (eg load("myfile.js")
) then
__FILE__
is set to that filename. Otherwise (eg load()
) or immediately
after booting, __FILE__
is not set.
function acceleration ⇒
Call type:
function acceleration()
Returns
An object with x, y, and z fields in it
Description
Note: This function is only available on the BBC micro:bit board
Get the current acceleration of the micro:bit from the on-board accelerometer
This is deprecated. Please use Microbit.accel
instead.
Note: This is only available in BBC micro:bit boards
function analogRead ⇒
Call type:
function analogRead(pin)
Parameters
pin
- The pin to use
You can find out which pins to use by looking at your board's reference page and searching for pins with the ADC
markers.
Returns
The analog Value of the Pin between 0 and 1
Description
Get the analogue value of the given pin
This is different to Arduino which only returns an integer between 0 and 1023
However only pins connected to an ADC will work (see the datasheet)
Note: if you didn't call pinMode
beforehand then this function will also
reset pin's state to "analog"
function analogWrite ⇒
Call type:
function analogWrite(pin, value, options)
Parameters
pin
- The pin to use
You can find out which pins to use by looking at your board's reference page and searching for pins with the PWM
or DAC
markers.
value
- A value between 0 and 1
options
- An object containing options for analog output - see below
Description
Set the analog Value of a pin. It will be output using PWM.
Objects can contain:
freq
- pulse frequency in Hz, e.g.analogWrite(A0,0.5,{ freq : 10 });
- specifying a frequency will force PWM output, even if the pin has a DACsoft
- boolean, If true software PWM is used if hardware is not available.forceSoft
- boolean, If true software PWM is used even if hardware PWM or a DAC is available
On nRF52-based devices (Puck.js, Pixl.js, MDBT42Q, etc) hardware PWM runs at 16MHz, with a maximum output frequency of 4MHz (but with only 2 bit (0..3) accuracy). At 1Mhz, you have 4 bits (0..15), 1kHz = 14 bits and so on.
Note: if you didn't call pinMode
beforehand then this function will also
reset pin's state to "output"
variable arguments ⇒
Call type:
variable arguments
Returns
An array containing all the arguments given to the function
Description
A variable containing the arguments given to the function:
function hello() {
console.log(arguments.length, JSON.stringify(arguments));
}
hello() // 0 []
hello("Test") // 1 ["Test"]
hello(1,2,3) // 3 [1,2,3]
Note: Due to the way Espruino works this is doesn't behave exactly the same
as in normal JavaScript. The length of the arguments array will never be less
than the number of arguments specified in the function declaration:
(function(a){ return arguments.length; })() == 1
. Normal JavaScript
interpreters would return 0
in the above case.
function atob ⇒
Call type:
function atob(base64Data)
Parameters
base64Data
- A string of base64 data to decode
Returns
A string containing the decoded data
Description
Decode the supplied base64 string into a normal string
Note: This is not available in devices with low flash memory
Bluetooth ⇒
Instance of Serial
Description
The Bluetooth Serial port - used when data is sent or received over Bluetooth
Smart on nRF51/nRF52 chips.
Note: This is only available in devices with Bluetooth LE capability
function btoa
⇒
The Bluetooth Serial port - used when data is sent or received over Bluetooth Smart on nRF51/nRF52 chips.
Note: This is only available in devices with Bluetooth LE capability
Call type:
function btoa(binaryData)
Parameters
binaryData
- A string of data to encode
Returns
A base64 encoded string
Description
Encode the supplied string (or array) into a base64 string
Note: This is not available in devices with low flash memory
function changeInterval ⇒
Call type:
function changeInterval(id, time)
Parameters
id
- The id returned by a previous call to setInterval
time
- The new time period in ms
Description
Change the Interval on a callback created with setInterval
, for example:
var id = setInterval(function () { print('foo'); }, 1000); // every second
changeInterval(id, 1500); // now runs every 1.5 seconds
This takes effect immediately and resets the timeout, so in the example above,
regardless of when you call changeInterval
, the next interval will occur
1500ms after it.
function clearInterval ⇒
Call type:
function clearInterval(id, ...)
Parameters
id, ...
- The id returned by a previous call to setInterval. Only one argument is allowed.
Description
Clear the Interval that was created with setInterval
, for example:
var id = setInterval(function () { print('foo'); }, 1000);
clearInterval(id);
If no argument is supplied, all timeouts and intervals are stopped.
To avoid accidentally deleting all Intervals, if a parameter is supplied but is undefined
then an Exception will be thrown.
function clearTimeout ⇒
Call type:
function clearTimeout(id, ...)
Parameters
id, ...
- The id returned by a previous call to setTimeout. Only one argument is allowed.
Description
Clear the Timeout that was created with setTimeout
, for example:
var id = setTimeout(function () { print('foo'); }, 1000);
clearTimeout(id);
If no argument is supplied, all timeouts and intervals are stopped.
To avoid accidentally deleting all Timeouts, if a parameter is supplied but is undefined
then an Exception will be thrown.
function clearWatch ⇒
Call type:
function clearWatch(id, ...)
Parameters
id, ...
- The id returned by a previous call to setWatch. Only one argument is allowed. (or pass nothing to clear all watches)
Description
Clear the Watch that was created with setWatch. If no parameter is supplied, all watches will be removed.
To avoid accidentally deleting all Watches, if a parameter is supplied but is undefined
then an Exception will be thrown.
function compass ⇒
Call type:
function compass()
Returns
An object with x, y, and z fields in it
Description
Note: This function is only available on the BBC micro:bit board
Get the current compass position for the micro:bit from the on-board magnetometer
This is deprecated. Please use Microbit.mag
instead.
Note: This is only available in BBC micro:bit boards
function decodeURIComponent ⇒
Call type:
function decodeURIComponent(str)
Parameters
str
- A string to decode from a URI
Returns
A string containing the decoded data
Description
Convert any groups of characters of the form '%ZZ', into characters with hex code '0xZZ'
Note: This is not available in devices with low flash memory
function digitalPulse ⇒
Call type:
function digitalPulse(pin, value, time)
Parameters
pin
- The pin to use
value
- Whether to pulse high (true) or low (false)
time
- A time in milliseconds, or an array of times (in which case a square wave will be output starting with a pulse of 'value')
Description
Pulse the pin with the value for the given time in milliseconds. It uses a
hardware timer to produce accurate pulses, and returns immediately (before the
pulse has finished). Use digitalPulse(A0,1,0)
to wait until a previous pulse
has finished.
e.g. digitalPulse(A0,1,5);
pulses A0 high for 5ms.
digitalPulse(A0,1,[5,2,4]);
pulses A0 high for 5ms, low for 2ms, and high for
4ms
Note: if you didn't call pinMode
beforehand then this function will also
reset pin's state to "output"
digitalPulse is for SHORT pulses that need to be very accurate. If you're doing anything over a few milliseconds, use setTimeout instead.
function digitalRead ⇒
Call type:
function digitalRead(pin)
Parameters
pin
- The pin to use
Returns
The digital Value of the Pin
Description
Get the digital value of the given pin.
Note: if you didn't call pinMode
beforehand then this function will also
reset pin's state to "input"
If the pin argument is an array of pins (e.g. [A2,A1,A0]
) the value returned
will be an number where the last array element is the least significant bit, for
example if A0=A1=1
and A2=0
, digitalRead([A2,A1,A0]) == 0b011
If the pin argument is an object with a read
method, the read
method will be
called and the integer value it returns passed back.
function digitalWrite ⇒
Call type:
function digitalWrite(pin, value)
Parameters
pin
- The pin to use
value
- Whether to pulse high (true) or low (false)
Description
Set the digital value of the given pin.
Note: if you didn't call pinMode
beforehand then this function will also
reset pin's state to "output"
If pin argument is an array of pins (e.g. [A2,A1,A0]
) the value argument will
be treated as an array of bits where the last array element is the least
significant bit.
In this case, pin values are set least significant bit first (from the
right-hand side of the array of pins). This means you can use the same pin
multiple times, for example digitalWrite([A1,A1,A0,A0],0b0101)
would pulse A0
followed by A1.
If the pin argument is an object with a write
method, the write
method will
be called with the value passed through.
function dump ⇒
Call type:
function dump()
Description
Output current interpreter state in a text form such that it can be copied to a new device
Espruino keeps its current state in RAM (even if the function code is stored in
Flash). When you type dump()
it dumps the current state of code in RAM plus
the hardware state, then if there's code saved in flash it writes "// Code saved
with E.setBootCode" and dumps that too.
Note: 'Internal' functions are currently not handled correctly. You will
need to recreate these in the onInit
function.
Note: This is not available in devices with low flash memory
function echo ⇒
Call type:
function echo(echoOn)
Parameters
echoOn
-
Description
Should Espruino echo what you type back to you? true = yes (Default), false = no. When echo is off, the result of executing a command is not returned. Instead, you must use 'print' to send output.
function edit ⇒
Call type:
function edit(funcName)
Parameters
funcName
- The name of the function to edit (either a string or just the unquoted name)
Description
Fill the console with the contents of the given function, so you can edit it.
NOTE: This is a convenience function - it will not edit 'inner functions'. For that, you must edit the 'outer function' and re-execute it.
Note: This is not available in devices with low flash memory
function encodeURIComponent ⇒
Call type:
function encodeURIComponent(str)
Parameters
str
- A string to encode as a URI
Returns
A string containing the encoded data
Description
Convert a string with any character not alphanumeric or - _ . ! ~ * ' ( )
converted to the form %XY
where XY
is its hexadecimal representation
Note: This is not available in devices with low flash memory
function eval ⇒
Call type:
function eval(code)
Parameters
code
-
Returns
The result of evaluating the string
Description
Evaluate a string containing JavaScript code
variable FET ⇒
Call type:
variable FET
Returns
See description above
Description
On Puck.js V2 (not v1.0) this is the pin that controls the FET, for high-powered outputs.
Note: This is only available in Puck.js devices
function getPinMode ⇒
Call type:
function getPinMode(pin)
Parameters
pin
- The pin to check
Returns
The pin mode, as a string
Description
Return the current mode of the given pin. See pinMode
for more information on
returned values.
Note: This is not available in devices with low flash memory
function getSerial ⇒
Call type:
function getSerial()
Returns
The board's serial number
Description
Get the serial number of this board
function getTime ⇒
Call type:
function getTime()
Returns
See description above
Description
Return the current system time in Seconds (as a floating point number)
variable global ⇒
Call type:
variable global
Returns
The global scope
Description
A reference to the global scope, where everything is defined.
variable HIGH ⇒
Call type:
variable HIGH
Returns
Logic 1 for Arduino compatibility - this is the same as just typing 1
I2C1 ⇒
Instance of I2C
Description
The first I2C port
Note: This is only available in devices with more than 1 I2C peripherals
I2C2
⇒
The first I2C port
Note: This is only available in devices with more than 1 I2C peripherals
Instance of I2C
Description
The second I2C port
Note: This is only available in devices with more than 2 I2C peripherals
I2C3
⇒
The second I2C port
Note: This is only available in devices with more than 2 I2C peripherals
Instance of I2C
Description
The third I2C port
Note: This is only available in devices with more than 3 I2C peripherals
variable Infinity
⇒
The third I2C port
Note: This is only available in devices with more than 3 I2C peripherals
Call type:
variable Infinity
Returns
Positive Infinity (1/0)
function isFinite ⇒
Call type:
function isFinite(x)
Parameters
x
-
Returns
True is the value is a Finite number, false if not.
Description
Is the parameter a finite number or not? If needed, the parameter is first converted to a number.
function isNaN ⇒
Call type:
function isNaN(x)
Parameters
x
-
Returns
True is the value is NaN, false if not.
Description
Whether the x is NaN (Not a Number) or not
function load ⇒
Call type:
function load(filename)
Parameters
filename
- [optional] The name of a text JS file to load from Storage after reset
Description
Restart and load the program out of flash - this has an effect similar to completely rebooting Espruino (power off/power on), but without actually performing a full reset of the hardware.
This command only executes when the Interpreter returns to the Idle state - for
instance a=1;load();a=2;
will still leave 'a' as undefined (or what it was
set to in the saved program).
Espruino will resume from where it was when you last typed save()
. If you want
code to be executed right after loading (for instance to initialise devices
connected to Espruino), add an init
event handler to E
with
E.on('init',
function() { ... your_code ... });
. This will then be automatically executed by
Espruino every time it starts.
If you specify a filename in the argument then that file will be loaded from
Storage after reset in much the same way as calling reset()
then
eval(require("Storage").read(filename))
LoopbackA ⇒
Instance of Serial
Description
LoopbackB
⇒
Instance of Serial
Description
variable LOW
⇒
Call type:
variable LOW
Returns
Logic 0 for Arduino compatibility - this is the same as just typing 0
variable NaN ⇒
Call type:
variable NaN
Returns
Not a Number
function parseFloat ⇒
Call type:
function parseFloat(string)
Parameters
string
-
Returns
The value of the string
Description
Convert a string representing a number into an float
function parseInt ⇒
Call type:
function parseInt(string, radix)
Parameters
string
-
radix
- [optional] The Radix of the string
Returns
The integer value of the string (or NaN)
Description
Convert a string representing a number into an integer
function peek16 ⇒
Call type:
function peek16(addr, count)
Parameters
addr
- The address in memory to read
count
- [optional] the number of items to read. If >1 a Uint16Array will be returned.
Returns
The value of memory at the given location
Description
Read 16 bits of memory at the given location - DANGEROUS!
function peek32 ⇒
Call type:
function peek32(addr, count)
Parameters
addr
- The address in memory to read
count
- [optional] the number of items to read. If >1 a Uint32Array will be returned.
Returns
The value of memory at the given location
Description
Read 32 bits of memory at the given location - DANGEROUS!
function peek8 ⇒
Call type:
function peek8(addr, count)
Parameters
addr
- The address in memory to read
count
- [optional] the number of items to read. If >1 a Uint8Array will be returned.
Returns
The value of memory at the given location
Description
Read 8 bits of memory at the given location - DANGEROUS!
function pinMode ⇒
Call type:
function pinMode(pin, mode, automatic)
Parameters
pin
- The pin to set pin mode for
mode
- The mode - a string that is either 'analog', 'input', 'inputpullup', 'inputpulldown', 'output', 'opendrain', 'afoutput' or 'afopendrain'. Do not include this argument or use 'auto' if you want to revert to automatic pin mode setting.
automatic
- Optional, default is false. If true, subsequent commands will automatically change the state (see notes below)
Description
Set the mode of the given pin.
auto
/undefined
- Don't change state, but allowdigitalWrite
/etc to automatically change state as appropriateanalog
- Analog inputinput
- Digital inputinput_pullup
- Digital input with internal ~40k pull-up resistorinput_pulldown
- Digital input with internal ~40k pull-down resistoroutput
- Digital outputopendrain
- Digital output that only ever pulls down to 0v. Sending a logical1
leaves the pin open circuitopendrain_pullup
- Digital output that pulls down to 0v. Sending a logical1
enables internal ~40k pull-up resistoraf_output
- Digital output from built-in peripheralaf_opendrain
- Digital output from built-in peripheral that only ever pulls down to 0v. Sending a logical1
leaves the pin open circuitNote:
digitalRead
/digitalWrite
/etc set the pin mode automatically unlesspinMode
has been called first. If you wantdigitalRead
/etc to set the pin mode automatically after you have calledpinMode
, simply call it again with no mode argument (pinMode(pin)
),auto
as the argument (
), or with the 3rd 'automatic' argument set to true (pinMode(pin, "auto")
).pinMode(pin, "output", true)
function poke16 ⇒
Call type:
function poke16(addr, value)
Parameters
addr
- The address in memory to write
value
- The value to write, or an array of values
Description
Write 16 bits of memory at the given location - VERY DANGEROUS!
function poke32 ⇒
Call type:
function poke32(addr, value)
Parameters
addr
- The address in memory to write
value
- The value to write, or an array of values
Description
Write 32 bits of memory at the given location - VERY DANGEROUS!
function poke8 ⇒
Call type:
function poke8(addr, value)
Parameters
addr
- The address in memory to write
value
- The value to write, or an array of values
Description
Write 8 bits of memory at the given location - VERY DANGEROUS!
function print ⇒
Call type:
function print(text, ...)
Parameters
text, ...
-
Description
Print the supplied string(s) to the console
Note:* If you're connected to a computer (not a wall adaptor) via USB but *you are not running a terminal app then when you print data Espruino may pause execution and wait until the computer requests the data it is trying to print.
function require ⇒
Call type:
function require(moduleName)
Parameters
moduleName
- A String containing the name of the given module
Returns
The result of evaluating the string
Description
Load the given module, and return the exported functions and variables.
For example:
var s = require("Storage");
s.write("test", "hello world");
print(s.read("test"));
// prints "hello world"
Check out the page on Modules for an explanation of what modules are and how you can use them.
function reset ⇒
Call type:
function reset(clearFlash)
Parameters
clearFlash
- Remove saved code from flash as well
Description
Reset the interpreter - clear program memory in RAM, and do not load a saved program from flash. This does NOT reset the underlying hardware (which allows you to reset the device without it disconnecting from USB).
This command only executes when the Interpreter returns to the Idle state - for
instance a=1;reset();a=2;
will still leave 'a' as undefined.
The safest way to do a full reset is to hit the reset button.
If reset()
is called with no arguments, it will reset the board's state in RAM
but will not reset the state in flash. When next powered on (or when load()
is
called) the board will load the previously saved code.
Calling reset(true)
will cause all saved code in flash memory to be cleared
as well.
function save ⇒
Call type:
function save()
Description
Save the state of the interpreter into flash (including the results of calling
setWatch
, setInterval
, pinMode
, and any listeners). The state will then be
loaded automatically every time Espruino powers on or is hard-reset. To see what
will get saved you can call dump()
.
Note: If you set up intervals/etc in onInit()
and you have already called
onInit
before running save()
, when Espruino resumes there will be two copies
of your intervals - the ones from before the save, and the ones from after -
which may cause you problems.
For more information about this and other options for saving, please see the Saving code on Espruino page.
This command only executes when the Interpreter returns to the Idle state - for
instance a=1;save();a=2;
will save 'a' as 2.
When Espruino powers on, it will resume from where it was when you typed
save()
. If you want code to be executed right after loading (for instance to
initialise devices connected to Espruino), add a function called onInit
, or
add a init
event handler to E
with
E.on('init', function() { ... your_code
... });
. This will then be automatically executed by Espruino every time it
starts.
In order to stop the program saved with this command being loaded automatically, check out the Troubleshooting guide
Note: This is not available in Bangle.js smartwatches
variable SCL ⇒
Call type:
variable SCL
Returns
See description above
Description
The pin marked SDA on the Arduino pin footprint. This is connected directly to pin A5.
Note: This is only available in Pixl.js boards
variable SDA ⇒
Call type:
variable SDA
Returns
See description above
Description
The pin marked SDA on the Arduino pin footprint. This is connected directly to pin A4.
Note: This is only available in Pixl.js boards
Serial1 ⇒
Instance of Serial
Description
The first Serial (USART) port
Note: This is only available in devices with more than 1 USART peripherals
Serial2
⇒
The first Serial (USART) port
Note: This is only available in devices with more than 1 USART peripherals
Instance of Serial
Description
The second Serial (USART) port
Note: This is only available in devices with more than 2 USART peripherals
Serial3
⇒
The second Serial (USART) port
Note: This is only available in devices with more than 2 USART peripherals
Instance of Serial
Description
The third Serial (USART) port
Note: This is only available in devices with more than 3 USART peripherals
Serial4
⇒
The third Serial (USART) port
Note: This is only available in devices with more than 3 USART peripherals
Instance of Serial
Description
The fourth Serial (USART) port
Note: This is only available in devices with more than 4 USART peripherals
Serial5
⇒
The fourth Serial (USART) port
Note: This is only available in devices with more than 4 USART peripherals
Instance of Serial
Description
The fifth Serial (USART) port
Note: This is only available in devices with more than 5 USART peripherals
Serial6
⇒
The fifth Serial (USART) port
Note: This is only available in devices with more than 5 USART peripherals
Instance of Serial
Description
The sixth Serial (USART) port
Note: This is only available in devices with more than 6 USART peripherals
function setBusyIndicator
⇒
The sixth Serial (USART) port
Note: This is only available in devices with more than 6 USART peripherals
Call type:
function setBusyIndicator(pin)
Parameters
pin
-
Description
When Espruino is busy, set the pin specified here high. Set this to undefined to disable the feature.
Note: This is not available in devices with low flash memory
function setDeepSleep ⇒
Call type:
function setDeepSleep(sleep)
Parameters
sleep
-
Description
Set whether we can enter deep sleep mode, which reduces power consumption to around 100uA. This only works on STM32 Espruino Boards (nRF52 boards sleep automatically).
Please see http://www.espruino.com/Power+Consumption for more details on this.
Note: This is only available in STM32 devices (including Espruino Original, Pico and WiFi) and EFM32 devices
function setInterval ⇒
Call type:
function setInterval(function, timeout, args, ...)
Parameters
function
- A Function or String to be executed
timeout
- The time between calls to the function (max 3153600000000 = 100 years
args, ...
- Optional arguments to pass to the function when executed
Returns
An ID that can be passed to clearInterval
Description
Call the function (or evaluate the string) specified REPEATEDLY after the timeout in milliseconds.
For instance:
setInterval(function () {
console.log("Hello World");
}, 1000);
// or
setInterval('console.log("Hello World");', 1000);
// both print 'Hello World' every second
You can also specify extra arguments that will be sent to the function when it is executed. For example:
setInterval(function (a,b) {
console.log(a+" "+b);
}, 1000, "Hello", "World");
// prints 'Hello World' every second
If you want to stop your function from being called, pass the number that was
returned by setInterval
into the clearInterval
function.
Note: If setDeepSleep(true)
has been called and the interval is greater
than 5 seconds, Espruino may execute the interval up to 1 second late. This is
because Espruino can only wake from deep sleep every second - and waking early
would cause Espruino to waste power while it waited for the correct time.
function setSleepIndicator ⇒
Call type:
function setSleepIndicator(pin)
Parameters
pin
-
Description
When Espruino is asleep, set the pin specified here low (when it's awake, set it high). Set this to undefined to disable the feature.
Please see http://www.espruino.com/Power+Consumption for more details on this.
Note: This is not available in devices with low flash memory
function setTime ⇒
Call type:
function setTime(time)
Parameters
time
-
Description
Set the current system time in seconds (time
can be a floating point value).
This is used with getTime
, the time reported from setWatch
, as well as when
using new Date()
.
Date.prototype.getTime()
reports the time in milliseconds, so you can set the
time to a Date
object using:
setTime((new Date("Tue, 19 Feb 2019 10:57")).getTime()/1000)
To set the timezone for all new Dates, use E.setTimeZone(hours)
.
function setTimeout ⇒
Call type:
function setTimeout(function, timeout, args, ...)
Parameters
function
- A Function or String to be executed
timeout
- The time until the function will be executed (max 3153600000000 = 100 years
args, ...
- Optional arguments to pass to the function when executed
Returns
An ID that can be passed to clearTimeout
Description
Call the function (or evaluate the string) specified ONCE after the timeout in milliseconds.
For instance:
setTimeout(function () {
console.log("Hello World");
}, 1000);
// or
setTimeout('console.log("Hello World");', 1000);
// both print 'Hello World' after a second
You can also specify extra arguments that will be sent to the function when it is executed. For example:
setTimeout(function (a,b) {
console.log(a+" "+b);
}, 1000, "Hello", "World");
// prints 'Hello World' after 1 second
If you want to stop the function from being called, pass the number that was
returned by setTimeout
into the clearTimeout
function.
Note: If setDeepSleep(true)
has been called and the interval is greater
than 5 seconds, Espruino may execute the interval up to 1 second late. This is
because Espruino can only wake from deep sleep every second - and waking early
would cause Espruino to waste power while it waited for the correct time.
function setWatch ⇒
Call type:
function setWatch(function, pin, options)
Parameters
function
- A Function or String to be executed
pin
- The pin to watch
options
- If a boolean or integer, it determines whether to call this once (false = default) or every time a change occurs (true). Can be an object of the form { repeat: true/false(default), edge:'rising'/'falling'/'both'(default), debounce:10}
- see below for more information.
Returns
An ID that can be passed to clearWatch
Description
Call the function specified when the pin changes. Watches set with setWatch
can be removed using clearWatch
.
If the options
parameter is an object, it can contain the following
information (all optional):
{
// Whether to keep producing callbacks, or remove the watch after the first callback
repeat: true/false(default),
// Trigger on the rising or falling edge of the signal. Can be a string, or 1='rising', -1='falling', 0='both'
edge:'rising'(default for built-in buttons)/'falling'/'both'(default for pins),
// Use software-debouncing to stop multiple calls if a switch bounces
// This is the time in milliseconds to wait for bounces to subside, or 0 to disable
debounce:10 (0 is default for pins, 25 is default for built-in buttons),
// Advanced: If the function supplied is a 'native' function (compiled or assembly)
// setting irq:true will call that function in the interrupt itself
irq : false(default)
// Advanced: If specified, the given pin will be read whenever the watch is called
// and the state will be included as a 'data' field in the callback
data : pin
// Advanced: On Nordic devices, a watch may be 'high' or 'low' accuracy. By default low
// accuracy is used (which is better for power consumption), but this means that
// high speed pulses (less than 25us) may not be reliably received. Setting hispeed=true
// allows for detecting high speed pulses at the expense of higher idle power consumption
hispeed : true
}
The function
callback is called with an argument, which is an object of type
{state:bool, time:float, lastTime:float}
.
state
is whether the pin is currently a1
or a0
time
is the time in seconds at which the pin changed statelastTime
is the time in seconds at which the pin last changed state. When usingedge:'rising'
oredge:'falling'
, this is not the same as when the function was last called.data
is included ifdata:pin
was specified in the options, and can be used for reading in clocked data
For instance, if you want to measure the length of a positive pulse you could use
setWatch(function(e) { console.log(e.time-e.lastTime); }, BTN, {
repeat:true, edge:'falling' });
. This will only be called on the falling edge
of the pulse, but will be able to measure the width of the pulse because
e.lastTime
is the time of the rising edge.
Internally, an interrupt writes the time of the pin's state change into a queue
with the exact time that it happened, and the function supplied to setWatch
is
executed only from the main message loop. However, if the callback is a native
function void (bool state)
then you can add irq:true
to options, which will
cause the function to be called from within the IRQ. When doing this, interrupts
will happen on both edges and there will be no debouncing.
Note: if you didn't call pinMode
beforehand then this function will reset
pin's state to "input"
Note: The STM32 chip (used in the Espruino Board and
Pico) cannot watch two pins with the same number - e.g. A0
and B0
.
Note: On nRF52 chips (used in Puck.js, Pixl.js, MDBT42Q) setWatch
disables
the GPIO output on that pin. In order to be able to write to the pin again you
need to disable the watch with clearWatch
.
function shiftOut ⇒
Call type:
function shiftOut(pins, options, data)
Parameters
pins
- A pin, or an array of pins to use
options
- Options, for instance the clock (see below)
data
- The data to shift out (see E.toUint8Array
for info on the forms this can take)
Description
Shift an array of data out using the pins supplied least significant bit first, for example:
// shift out to single clk+data
shiftOut(A0, { clk : A1 }, [1,0,1,0]);
// shift out a whole byte (like software SPI)
shiftOut(A0, { clk : A1, repeat: 8 }, [1,2,3,4]);
// shift out via 4 data pins
shiftOut([A3,A2,A1,A0], { clk : A4 }, [1,2,3,4]);
options
is an object of the form:
{
clk : pin, // a pin to use as the clock (undefined = no pin)
clkPol : bool, // clock polarity - default is 0 (so 1 normally, pulsing to 0 to clock data in)
repeat : int, // number of clocks per array item
}
Each item in the data
array will be output to the pins, with the first pin in
the array being the MSB and the last the LSB, then the clock will be pulsed in
the polarity given.
repeat
is the amount of times shift data out for each array item. For instance
we may want to shift 8 bits out through 2 pins - in which case we need to set
repeat to 4.
function show ⇒
Call type:
function show(image)
Parameters
image
- The image to show
Description
Note: This function is only available on the BBC micro:bit board
Show an image on the in-built 5x5 LED screen.
Image can be:
- A number where each bit represents a pixel (so 25 bits). e.g.
5
or0x1FFFFFF
- A string, e.g:
show("10001")
. Newlines are ignored, and anything that is not a space or0
is treated as a 1. - An array of 4 bytes (more will be ignored), e.g
show([1,2,3,0])
For instance the following works for images:
show("# #"+
" # "+
" # "+
"# #"+
" ### ")
This means you can also use Espruino's graphics library:
var g = Graphics.createArrayBuffer(5,5,1)
g.drawString("E",0,0)
show(g.buffer)
Note: This is only available in BBC micro:bit boards
SPI1 ⇒
Instance of SPI
Description
The first SPI port
Note: This is only available in devices with more than 1 SPI peripherals
SPI2
⇒
The first SPI port
Note: This is only available in devices with more than 1 SPI peripherals
Instance of SPI
Description
The second SPI port
Note: This is only available in devices with more than 2 SPI peripherals
SPI3
⇒
The second SPI port
Note: This is only available in devices with more than 2 SPI peripherals
Instance of SPI
Description
The third SPI port
Note: This is only available in devices with more than 3 SPI peripherals
Telnet
⇒
The third SPI port
Note: This is only available in devices with more than 3 SPI peripherals
Instance of Serial
Description
A telnet serial device that maps to the built-in telnet console server (devices
that have built-in wifi only).
Note: This is only available in devices with Telnet enabled (Linux, ESP8266 and ESP32)
Terminal
⇒
A telnet serial device that maps to the built-in telnet console server (devices that have built-in wifi only).
Note: This is only available in devices with Telnet enabled (Linux, ESP8266 and ESP32)
Instance of Serial
Description
A simple VT100 terminal emulator.
When data is sent to the Terminal
object, Graphics.getInstance()
is called
and if an instance of Graphics
is found then characters are written to it.
Note: This is only available in devices with VT100 terminal emulation enabled (Pixl.js only)
function trace
⇒
A simple VT100 terminal emulator.
When data is sent to the Terminal
object, Graphics.getInstance()
is called
and if an instance of Graphics
is found then characters are written to it.
Note: This is only available in devices with VT100 terminal emulation enabled (Pixl.js only)
Call type:
function trace(root)
Parameters
root
- The symbol to output (optional). If nothing is specified, everything will be output
Description
Output debugging information
Note: This is not included on boards with low amounts of flash memory, or the Espruino board.
Note: This is not available in devices with low flash memory
USB ⇒
Instance of Serial
Description
The USB Serial port
Note: This is only available in devices with USB
variable VIBRATE
⇒
The USB Serial port
Note: This is only available in devices with USB
Call type:
variable VIBRATE
Returns
See description above
Description
The Bangle.js's vibration motor.
Note: This is only available in Bangle.js smartwatches
AES Class
Class containing AES encryption/decryption
Note: This library is currently only included in builds for boards where
there is space. For other boards there is crypto.js
which implements SHA1 in
JS.
Methods and Fields
AES.decrypt ⇒
Call type:
AES.decrypt(passphrase, key, options)
Parameters
passphrase
- Message to decrypt
key
- Key to encrypt message - must be an ArrayBuffer of 128, 192, or 256 BITS
options
- [optional] An object, may specify { iv : new Uint8Array(16), mode : 'CBC|CFB|CTR|OFB|ECB' }
Returns
Returns an ArrayBuffer
AES.encrypt ⇒
Call type:
AES.encrypt(passphrase, key, options)
Parameters
passphrase
- Message to encrypt
key
- Key to encrypt message - must be an ArrayBuffer of 128, 192, or 256 BITS
options
- [optional] An object, may specify { iv : new Uint8Array(16), mode : 'CBC|CFB|CTR|OFB|ECB' }
Returns
Returns an ArrayBuffer
Array Class
This is the built-in JavaScript class for arrays.
Arrays can be defined with []
, new Array()
, or
new
Array(length)
Methods and Fields
- constructor Array(args, ...)
- function Array.concat(args, ...)
- function Array.every(function, thisArg)
- function Array.fill(value, start, end)
- function Array.filter(function, thisArg)
- function Array.find(function)
- function Array.findIndex(function)
- function Array.forEach(function, thisArg)
- function Array.includes(value, startIndex)
- function Array.indexOf(value, startIndex)
- Array.isArray(var)
- function Array.join(separator)
- property Array.length
- function Array.map(function, thisArg)
- function Array.pop()
- function Array.push(arguments, ...)
- function Array.reduce(callback, initialValue)
- function Array.reverse()
- function Array.shift()
- function Array.slice(start, end)
- function Array.some(function, thisArg)
- function Array.sort(var)
- function Array.splice(index, howMany, elements, ...)
- function Array.toString(radix)
- function Array.unshift(elements, ...)
constructor Array ⇒
Call type:
new Array(args, ...)
Parameters
args, ...
- The length of the array OR any number of items to add to the array
Returns
An Array
Description
Create an Array. Either give it one integer argument (>=0) which is the length of the array, or any number of arguments
function Array.concat ⇒
Call type:
function Array.concat(args, ...)
Parameters
args, ...
- Any items to add to the array
Returns
An Array
Description
Create a new array, containing the elements from this one and any arguments, if any argument is an array then those elements will be added.
Note: This is not available in devices with low flash memory
function Array.every ⇒
Call type:
function Array.every(function, thisArg)
Parameters
function
- Function to be executed
thisArg
- [optional] If specified, the function is called with 'this' set to thisArg
Returns
A boolean containing the result
Description
Return 'true' if the callback returns 'true' for every element in the array
function Array.fill ⇒
Call type:
function Array.fill(value, start, end)
Parameters
value
- The value to fill the array with
start
- Optional. The index to start from (or 0). If start is negative, it is treated as length+start where length is the length of the array
end
- Optional. The index to end at (or the array length). If end is negative, it is treated as length+end.
Returns
This array
Description
Fill this array with the given value, for every index >= start
and < end
Note: This is not available in devices with low flash memory
function Array.filter ⇒
Call type:
function Array.filter(function, thisArg)
Parameters
function
- Function to be executed
thisArg
- [optional] If specified, the function is called with 'this' set to thisArg
Returns
An array containing the results
Description
Return an array which contains only those elements for which the callback function returns 'true'
function Array.find ⇒
Call type:
function Array.find(function)
Parameters
function
- Function to be executed
Returns
The array element where function
returns true
, or undefined
Description
Return the array element where function
returns true
, or undefined
if it
doesn't returns true
for any element.
["Hello","There","World"].find(a=>a[0]=="T")
// returns "There"
Note: This is not available in devices with low flash memory
function Array.findIndex ⇒
Call type:
function Array.findIndex(function)
Parameters
function
- Function to be executed
Returns
The array element's index where function
returns true
, or -1
Description
Return the array element's index where function
returns true
, or -1
if it
doesn't returns true
for any element.
["Hello","There","World"].findIndex(a=>a[0]=="T")
// returns 1
Note: This is not available in devices with low flash memory
function Array.forEach ⇒
Call type:
function Array.forEach(function, thisArg)
Parameters
function
- Function to be executed
thisArg
- [optional] If specified, the function is called with 'this' set to thisArg
Description
Executes a provided function once per array element.
function Array.includes ⇒
Call type:
function Array.includes(value, startIndex)
Parameters
value
- The value to check for
startIndex
- [optional] the index to search from, or 0 if not specified
Returns
true
if the array includes the value, false
otherwise
Description
Return true
if the array includes the value, false
otherwise
Note: This is not available in devices with low flash memory
function Array.indexOf ⇒
Call type:
function Array.indexOf(value, startIndex)
Parameters
value
- The value to check for
startIndex
- [optional] the index to search from, or 0 if not specified
Returns
the index of the value in the array, or -1
Description
Return the index of the value in the array, or -1
Array.isArray ⇒
Call type:
Array.isArray(var)
Parameters
var
- The variable to be tested
Returns
True if var is an array, false if not.
Description
Returns true if the provided object is an array
function Array.join ⇒
Call type:
function Array.join(separator)
Parameters
separator
- The separator
Returns
A String representing the Joined array
Description
Join all elements of this array together into one string, using 'separator'
between them. e.g. [1,2,3].join(' ')=='1 2 3'
property Array.length ⇒
Call type:
property Array.length
Returns
The length of the array
Description
Find the length of the array
function Array.map ⇒
Call type:
function Array.map(function, thisArg)
Parameters
function
- Function used to map one item to another
thisArg
- [optional] If specified, the function is called with 'this' set to thisArg
Returns
An array containing the results
Description
Return an array which is made from the following:
A.map(function) =
[function(A[0]), function(A[1]), ...]
function Array.pop ⇒
Call type:
function Array.pop()
Returns
The value that is popped off
Description
Remove and return the value on the end of this array.
This is the opposite of [1,2,3].shift()
, which removes an element from the
beginning of the array.
function Array.push ⇒
Call type:
function Array.push(arguments, ...)
Parameters
arguments, ...
- One or more arguments to add
Returns
The new size of the array
Description
Push a new value onto the end of this array'
This is the opposite of [1,2,3].unshift(0)
, which adds one or more elements to
the beginning of the array.
function Array.reduce ⇒
Call type:
function Array.reduce(callback, initialValue)
Parameters
callback
- Function used to reduce the array
initialValue
- if specified, the initial value to pass to the function
Returns
The value returned by the last function called
Description
Execute previousValue=initialValue
and then
previousValue =
callback(previousValue, currentValue, index, array)
for each element in the
array, and finally return previousValue.
Note: This is not available in devices with low flash memory
function Array.reverse ⇒
Call type:
function Array.reverse()
Returns
The array, but reversed.
Description
Reverse all elements in this array (in place)
Note: This is not available in devices with low flash memory
function Array.shift ⇒
Call type:
function Array.shift()
Parameters
Returns
The element that was removed
Description
Remove and return the first element of the array.
This is the opposite of [1,2,3].pop()
, which takes an element off the end.
Note: This is not available in devices with low flash memory
function Array.slice ⇒
Call type:
function Array.slice(start, end)
Parameters
start
- Start index
end
- [optional] End index
Returns
A new array
Description
Return a copy of a portion of this array (in a new array)
function Array.some ⇒
Call type:
function Array.some(function, thisArg)
Parameters
function
- Function to be executed
thisArg
- [optional] If specified, the function is called with 'this' set to thisArg
Returns
A boolean containing the result
Description
Return 'true' if the callback returns 'true' for any of the elements in the array
function Array.sort ⇒
Call type:
function Array.sort(var)
Parameters
var
- A function to use to compare array elements (or undefined)
Returns
This array object
Description
Do an in-place quicksort of the array
Note: This is not available in devices with low flash memory
function Array.splice ⇒
Call type:
function Array.splice(index, howMany, elements, ...)
Parameters
index
- Index at which to start changing the array. If negative, will begin that many elements from the end
howMany
- An integer indicating the number of old array elements to remove. If howMany is 0, no elements are removed.
elements, ...
- One or more items to add to the array
Returns
An array containing the removed elements. If only one element is removed, an array of one element is returned.
Description
Both remove and add items to an array
function Array.toString ⇒
Call type:
function Array.toString(radix)
Parameters
radix
- unused
Returns
A String representing the array
Description
Convert the Array to a string
function Array.unshift ⇒
Call type:
function Array.unshift(elements, ...)
Parameters
elements, ...
- One or more items to add to the beginning of the array
Returns
The new array length
Description
Add one or more items to the start of the array, and return its new length.
This is the opposite of [1,2,3].push(4)
, which puts one or more elements on
the end.
Note: This is not available in devices with low flash memory
ArrayBuffer Class
This is the built-in JavaScript class for array buffers.
If you want to access arrays of differing types of data you may also find
DataView
useful.
Methods and Fields
constructor ArrayBuffer ⇒
Call type:
new ArrayBuffer(byteLength)
Parameters
byteLength
- The length in Bytes
Returns
An ArrayBuffer object
Description
Create an Array Buffer object
property ArrayBuffer.byteLength ⇒
Call type:
property ArrayBuffer.byteLength
Returns
The Length in bytes
Description
The length, in bytes, of the ArrayBuffer
ArrayBufferView Class
This is the built-in JavaScript class that is the prototype for:
- Uint8Array
- UintClamped8Array
- Int8Array
- Uint16Array
- Int16Array
- Uint24Array (Espruino-specific - not standard JS)
- Uint32Array
- Int32Array
- Float32Array
- Float64Array
If you want to access arrays of differing types of data you may also find
DataView
useful.
Methods and Fields
- property ArrayBufferView.buffer
- property ArrayBufferView.byteLength
- property ArrayBufferView.byteOffset
- function ArrayBufferView.fill(value, start, end)
- function ArrayBufferView.filter(function, thisArg)
- function ArrayBufferView.find(function)
- function ArrayBufferView.findIndex(function)
- function ArrayBufferView.forEach(function, thisArg)
- function ArrayBufferView.includes(value, startIndex)
- function ArrayBufferView.indexOf(value, startIndex)
- function ArrayBufferView.join(separator)
- function ArrayBufferView.map(function, thisArg)
- function ArrayBufferView.reduce(callback, initialValue)
- function ArrayBufferView.reverse()
- function ArrayBufferView.set(arr, offset)
- function ArrayBufferView.slice(start, end)
- function ArrayBufferView.sort(var)
- function ArrayBufferView.subarray(begin, end)
property ArrayBufferView.buffer ⇒
Call type:
property ArrayBufferView.buffer
Returns
An ArrayBuffer object
Description
The buffer this view references
property ArrayBufferView.byteLength ⇒
Call type:
property ArrayBufferView.byteLength
Returns
The Length
Description
The length, in bytes, of the ArrayBufferView
property ArrayBufferView.byteOffset ⇒
Call type:
property ArrayBufferView.byteOffset
Returns
The byte Offset
Description
The offset, in bytes, to the first byte of the view within the backing
ArrayBuffer
function ArrayBufferView.fill ⇒
Call type:
function ArrayBufferView.fill(value, start, end)
Parameters
value
- The value to fill the array with
start
- Optional. The index to start from (or 0). If start is negative, it is treated as length+start where length is the length of the array
end
- Optional. The index to end at (or the array length). If end is negative, it is treated as length+end.
Returns
This array
Description
Fill this array with the given value, for every index >= start
and < end
Note: This is not available in devices with low flash memory
function ArrayBufferView.filter ⇒
Call type:
function ArrayBufferView.filter(function, thisArg)
Parameters
function
- Function to be executed
thisArg
- [optional] If specified, the function is called with 'this' set to thisArg
Returns
An array containing the results
Description
Return an array which contains only those elements for which the callback function returns 'true'
Note: This is not available in devices with low flash memory
function ArrayBufferView.find ⇒
Call type:
function ArrayBufferView.find(function)
Parameters
function
- Function to be executed
Returns
The array element where function
returns true
, or undefined
Description
Return the array element where function
returns true
, or undefined
if it
doesn't returns true
for any element.
Note: This is not available in devices with low flash memory
function ArrayBufferView.findIndex ⇒
Call type:
function ArrayBufferView.findIndex(function)
Parameters
function
- Function to be executed
Returns
The array element's index where function
returns true
, or -1
Description
Return the array element's index where function
returns true
, or -1
if it
doesn't returns true
for any element.
Note: This is not available in devices with low flash memory
function ArrayBufferView.forEach ⇒
Call type:
function ArrayBufferView.forEach(function, thisArg)
Parameters
function
- Function to be executed
thisArg
- [optional] If specified, the function is called with 'this' set to thisArg
Description
Executes a provided function once per array element.
function ArrayBufferView.includes ⇒
Call type:
function ArrayBufferView.includes(value, startIndex)
Parameters
value
- The value to check for
startIndex
- [optional] the index to search from, or 0 if not specified
Returns
true
if the array includes the value, false
otherwise
Description
Return true
if the array includes the value, false
otherwise
Note: This is not available in devices with low flash memory
function ArrayBufferView.indexOf ⇒
Call type:
function ArrayBufferView.indexOf(value, startIndex)
Parameters
value
- The value to check for
startIndex
- [optional] the index to search from, or 0 if not specified
Returns
the index of the value in the array, or -1
Description
Return the index of the value in the array, or -1
function ArrayBufferView.join ⇒
Call type:
function ArrayBufferView.join(separator)
Parameters
separator
- The separator
Returns
A String representing the Joined array
Description
Join all elements of this array together into one string, using 'separator'
between them. e.g. [1,2,3].join(' ')=='1 2 3'
function ArrayBufferView.map ⇒
Call type:
function ArrayBufferView.map(function, thisArg)
Parameters
function
- Function used to map one item to another
thisArg
- [optional] If specified, the function is called with 'this' set to thisArg
Returns
An array containing the results
Description
Return an array which is made from the following:
A.map(function) =
[function(A[0]), function(A[1]), ...]
Note: This returns an ArrayBuffer
of the same type it was called on. To
get an Array
, use Array.map
, e.g. [].map.call(myArray, x=>x+1)
function ArrayBufferView.reduce ⇒
Call type:
function ArrayBufferView.reduce(callback, initialValue)
Parameters
callback
- Function used to reduce the array
initialValue
- if specified, the initial value to pass to the function
Returns
The value returned by the last function called
Description
Execute previousValue=initialValue
and then
previousValue =
callback(previousValue, currentValue, index, array)
for each element in the
array, and finally return previousValue.
Note: This is not available in devices with low flash memory
function ArrayBufferView.reverse ⇒
Call type:
function ArrayBufferView.reverse()
Returns
This array
Description
Reverse the contents of this ArrayBufferView
in-place
Note: This is not available in devices with low flash memory
function ArrayBufferView.set ⇒
Call type:
function ArrayBufferView.set(arr, offset)
Parameters
arr
- Floating point index to access
offset
- [optional] The offset in this array at which to write the values
Description
Copy the contents of array
into this one, mapping this[x+offset]=array[x];
function ArrayBufferView.slice ⇒
Call type:
function ArrayBufferView.slice(start, end)
Parameters
start
- Start index
end
- [optional] End index
Returns
A new array
Description
Return a copy of a portion of this array (in a new array).
Note: This currently returns a normal Array
, not an ArrayBuffer
Note: This is not available in devices with low flash memory
function ArrayBufferView.sort ⇒
Call type:
function ArrayBufferView.sort(var)
Parameters
var
- A function to use to compare array elements (or undefined)
Returns
This array object
Description
Do an in-place quicksort of the array
Note: This is not available in devices with low flash memory
function ArrayBufferView.subarray ⇒
Call type:
function ArrayBufferView.subarray(begin, end)
Parameters
begin
- Element to begin at, inclusive. If negative, this is from the end of the array. The entire array is included if this isn't specified
end
- Element to end at, exclusive. If negative, it is relative to the end of the array. If not specified the whole array is included
Returns
An ArrayBufferView
of the same type as this one, referencing the same data
Description
Returns a smaller part of this array which references the same data (it doesn't copy it).
Note: This is not available in devices with low flash memory
Bangle Class
Class containing utility functions for the Bangle.js Smart Watch
Methods and Fields
- event Bangle.accel(xyz)
- Bangle.accelRd(reg, cnt)
- Bangle.accelWr(reg, data)
- event Bangle.aiGesture(gesture, weights)
- Bangle.appRect
- event Bangle.backlight(on)
- Bangle.barometerRd(reg, cnt)
- Bangle.barometerWr(reg, data)
- Bangle.beep(time, freq)
- Bangle.buzz(time, strength)
- event Bangle.charging(charging)
- Bangle.compassRd(reg, cnt)
- Bangle.compassWr(reg, data)
- Bangle.dbg()
- event Bangle.drag(event)
- Bangle.drawWidgets()
- event Bangle.faceUp(up)
- Bangle.factoryReset(noReboot)
- event Bangle.gesture(xyz)
- Bangle.getAccel()
- Bangle.getCompass()
- Bangle.getGPSFix()
- Bangle.getHealthStatus(range)
- Bangle.getLCDMode()
- Bangle.getLogo()
- Bangle.getOptions()
- Bangle.getPressure()
- Bangle.getStepCount()
- event Bangle.GPS(fix)
- event Bangle.GPS-raw(nmea, dataLoss)
- event Bangle.health(info)
- event Bangle.HRM(hrm)
- event Bangle.HRM-env(env)
- event Bangle.HRM-raw(hrm)
- Bangle.hrmRd(reg, cnt)
- Bangle.hrmWr(reg, data)
- Bangle.ioWr(mask, isOn)
- Bangle.isBacklightOn()
- Bangle.isBarometerOn()
- Bangle.isCharging()
- Bangle.isCompassOn()
- Bangle.isGPSOn()
- Bangle.isHRMOn()
- Bangle.isLCDOn()
- Bangle.isLocked()
- event Bangle.lcdPower(on)
- Bangle.lcdWr(cmd, data)
- Bangle.load(file)
- Bangle.loadWidgets()
- event Bangle.lock(on, reason)
- event Bangle.mag(xyz)
- event Bangle.midnight()
- Bangle.off()
- event Bangle.pressure(e)
- Bangle.project(latlong)
- Bangle.resetCompass()
- Bangle.setBacklight(isOn)
- Bangle.setBarometerPower(isOn, appID)
- Bangle.setCompassPower(isOn, appID)
- Bangle.setGPSPower(isOn, appID)
- Bangle.setHRMPower(isOn, appID)
- Bangle.setLCDBrightness(brightness)
- Bangle.setLCDMode(mode)
- Bangle.setLCDOffset(y)
- Bangle.setLCDOverlay(img, x, y)
- Bangle.setLCDPower(isOn)
- Bangle.setLCDRotation(d)
- Bangle.setLCDTimeout(isOn)
- Bangle.setLocked(isLocked)
- Bangle.setOptions(options)
- Bangle.setPollInterval(interval)
- Bangle.setStepCount(count)
- Bangle.setUI(type, callback)
- Bangle.showClock()
- Bangle.showLauncher()
- Bangle.showRecoveryMenu()
- Bangle.showTestScreen()
- Bangle.softOff()
- event Bangle.step(up)
- event Bangle.stroke(event)
- event Bangle.swipe(directionLR, directionUD)
- event Bangle.tap(data)
- event Bangle.touch(button, xy)
- event Bangle.twist()
event Bangle.accel ⇒
Call type:
Bangle.on('accel', function(xyz) { ... });
Parameters
xyz
-
Description
Accelerometer data available with {x,y,z,diff,mag}
object as a parameter.
x
is X axis (left-right) ing
y
is Y axis (up-down) ing
z
is Z axis (in-out) ing
diff
is difference between this and the last reading ing
mag
is the magnitude of the acceleration ing
You can also retrieve the most recent reading with Bangle.getAccel()
.
Note: This is only available in Bangle.js smartwatches
Bangle.accelRd ⇒
Call type:
Bangle.accelRd(reg, cnt)
Parameters
reg
-
cnt
- If specified, returns an array of the given length (max 128). If not (or 0) it returns a number
Returns
See description above
Description
Reads a register from the accelerometer
Note: On Espruino 2v06 and before this function only returns a number (cnt
is ignored).
Note: This is only available in Bangle.js smartwatches
Bangle.accelWr ⇒
Call type:
Bangle.accelWr(reg, data)
Parameters
reg
-
data
-
Description
Writes a register on the accelerometer
Note: This is only available in Bangle.js smartwatches
event Bangle.aiGesture ⇒
Call type:
Bangle.on('aiGesture', function(gesture, weights) { ... });
Parameters
gesture
- The name of the gesture (if '.tfnames' exists, or the index. 'undefined' if not matching
weights
- An array of floating point values output by the model
Description
Emitted when a 'gesture' (fast movement) is detected, and a Tensorflow model is
in storage in the ".tfmodel"
file.
If a ".tfnames"
file is specified as a comma-separated list of names, it will
be used to decode gesture
from a number into a string.
Note: This is only available in Bangle.js smartwatches
Bangle.appRect ⇒
Call type:
Bangle.appRect
Returns
An object of the form {x,y,w,h,x2,y2}
Description
Returns the rectangle on the screen that is currently reserved for the app.
Note: This is only available in Bangle.js smartwatches
event Bangle.backlight ⇒
Call type:
Bangle.on('backlight', function(on) { ... });
Parameters
on
- true
if backlight is on
Description
Has the backlight been turned on or off? Can be used to stop tasks that are no
longer useful if want to see in sun screen only. Also see Bangle.isBacklightOn()
Note: This is only available in Bangle.js smartwatches
Bangle.barometerRd ⇒
Call type:
Bangle.barometerRd(reg, cnt)
Parameters
reg
-
cnt
- If specified, returns an array of the given length (max 128). If not (or 0) it returns a number
Returns
See description above
Description
Reads a register from the barometer IC
Note: This is only available in DTNO1_F5 and Bangle.js 2 smartwatches and DICKENS
Bangle.barometerWr ⇒
Call type:
Bangle.barometerWr(reg, data)
Parameters
reg
-
data
-
Description
Writes a register on the barometer IC
Note: This is only available in DTNO1_F5 and Bangle.js 2 smartwatches and DICKENS
Bangle.beep ⇒
Call type:
Bangle.beep(time, freq)
Parameters
time
- [optional] Time in ms (default 200)
freq
- [optional] Frequency in hz (default 4000)
Returns
A promise, completed when beep is finished
Description
Use the piezo speaker to Beep for a certain time period and frequency
Note: This is only available in Bangle.js smartwatches
Bangle.buzz ⇒
Call type:
Bangle.buzz(time, strength)
Parameters
time
- [optional] Time in ms (default 200)
strength
- [optional] Power of vibration from 0 to 1 (Default 1)
Returns
A promise, completed when vibration is finished
Description
Use the vibration motor to buzz for a certain time period
Note: This is only available in Bangle.js smartwatches
event Bangle.charging ⇒
Call type:
Bangle.on('charging', function(charging) { ... });
Parameters
charging
- true
if charging
Description
Is the battery charging or not?
Note: This is only available in Bangle.js smartwatches
Bangle.compassRd ⇒
Call type:
Bangle.compassRd(reg, cnt)
Parameters
reg
-
cnt
- If specified, returns an array of the given length (max 128). If not (or 0) it returns a number
Returns
See description above
Description
Read a register on the Magnetometer/Compass
Note: This is only available in Bangle.js smartwatches
Bangle.compassWr ⇒
Call type:
Bangle.compassWr(reg, data)
Parameters
reg
-
data
-
Description
Writes a register on the Magnetometer/Compass
Note: This is only available in Bangle.js smartwatches
Bangle.dbg ⇒
Call type:
Bangle.dbg()
Returns
See description above
Description
Reads debug info. Exposes the current values of accHistoryIdx
, accGestureCount
, accIdleCount
, pollInterval
and others.
Please see the declaration of this function for more information (click the ==>
link above this description)
Note: This is only available in Bangle.js smartwatches
event Bangle.drag ⇒
Call type:
Bangle.on('drag', function(event) { ... });
Parameters
event
- Object of form {x,y,dx,dy,b}
containing touch coordinates, difference in touch coordinates, and an integer b
containing number of touch points (currently 1 or 0)
Description
Emitted when the touchscreen is dragged or released
The touchscreen extends past the edge of the screen and while x
and y
coordinates are arranged such that they align with the LCD's pixels, if your
finger goes towards the edge of the screen, x
and y
could end up larger than
175 (the screen's maximum pixel coordinates) or smaller than 0. Coordinates from
the touch
event are clipped.
Note: This is only available in Bangle.js smartwatches
Bangle.drawWidgets ⇒
Call type:
Bangle.drawWidgets()
Description
Draw any onscreen widgets that were loaded with Bangle.loadWidgets()
.
Widgets should redraw themselves when something changes - you'll only need to
call drawWidgets if you decide to clear the entire screen with g.clear()
.
Note: This is only available in Bangle.js smartwatches
Note: This is only available in Bangle.js smartwatches with DICKENS
event Bangle.faceUp ⇒
Call type:
Bangle.on('faceUp', function(up) { ... });
Parameters
up
- true
if face-up
Description
Has the watch been moved so that it is face-up, or not face up?
Note: This is only available in Bangle.js smartwatches
Bangle.factoryReset ⇒
Call type:
Bangle.factoryReset(noReboot)
Parameters
noReboot
- Do not reboot the watch when done (default false, so will reboot)
Description
Erase all storage and reload it with the default contents.
This is only available on Bangle.js 2.0. On Bangle.js 1.0 you need to use
Install Default Apps
under the More...
tab of http://banglejs.com/apps
Note: This is only available in Bangle.js 2 smartwatches and EMULATED and DICKENS
event Bangle.gesture ⇒
Call type:
Bangle.on('gesture', function(xyz) { ... });
Parameters
xyz
- An Int8Array of XYZXYZXYZ data
Description
Emitted when a 'gesture' (fast movement) is detected
Note: This is only available in Bangle.js smartwatches
Bangle.getAccel ⇒
Call type:
Bangle.getAccel()
Returns
An object containing accelerometer readings (as below)
Description
Get the most recent accelerometer reading. Data is in the same format as the
Bangle.on('accel',
event.
x
is X axis (left-right) ing
y
is Y axis (up-down) ing
z
is Z axis (in-out) ing
diff
is difference between this and the last reading ing
(calculated by comparing vectors, not magnitudes)td
is the elapsedmag
is the magnitude of the acceleration ing
Note: This is only available in Bangle.js smartwatches
Bangle.getCompass ⇒
Call type:
Bangle.getCompass()
Returns
An object containing magnetometer readings (as below)
Description
Get the most recent Magnetometer/Compass reading. Data is in the same format as
the Bangle.on('mag',
event.
Returns an {x,y,z,dx,dy,dz,heading}
object
x/y/z
raw x,y,z magnetometer readingsdx/dy/dz
readings based on calibration since magnetometer turned onheading
in degrees based on calibrated readings (will be NaN if magnetometer hasn't been rotated around 360 degrees).
Note: In 2v15 firmware and earlier the heading is inverted (360-heading). There's a fix in the bootloader which will apply a fix for those headings, but old apps may still expect an inverted value.
To get this event you must turn the compass on with Bangle.setCompassPower(1)
.
Note: This is only available in Bangle.js smartwatches
Bangle.getGPSFix ⇒
Call type:
Bangle.getGPSFix()
Returns
A GPS fix object with {lat,lon,...}
Description
Get the last available GPS fix info (or undefined
if GPS is off).
The fix info received is the same as you'd get from the Bangle.GPS
event.
Note: This is only available in Bangle.js smartwatches
Bangle.getHealthStatus ⇒
Call type:
Bangle.getHealthStatus(range)
Parameters
range
- What time period to return data for, see below:
Returns
Returns an object containing various health info
Description
range
is one of:
undefined
or'10min'
- health data so far in this 10 minute block (eg. 9:00.00 - 9:09.59)'last'
- health data during the last 10 minute block'day'
- the health data so far for the day
getHealthStatus
returns an object containing:
movement
is the 32 bit sum of allacc.diff
readings since power on (and rolls over). It is the difference in accelerometer values asg*8192
steps
is the number of steps during this periodbpm
the best BPM reading from HRM sensor during this periodbpmConfidence
best BPM confidence (0-100%) during this period
Note: This is only available in Bangle.js smartwatches
Bangle.getLCDMode ⇒
Call type:
Bangle.getLCDMode()
Returns
The LCD mode as a String
Description
The current LCD mode.
See Bangle.setLCDMode
for examples.
Note: This is only available in Bangle.js smartwatches
Bangle.getLogo ⇒
Call type:
Bangle.getLogo()
Returns
An image to be used with g.drawImage
(as a String)
Description
- On platforms with an LCD of >=8bpp this is 222 x 104 x 2 bits
- Otherwise it's 119 x 56 x 1 bits
Note: This is only available in Bangle.js smartwatches
Bangle.getOptions ⇒
Call type:
Bangle.getOptions()
Returns
The current state of all options
Description
Return the current state of options as set by Bangle.setOptions
Note: This is only available in Bangle.js smartwatches
Bangle.getPressure ⇒
Call type:
Bangle.getPressure()
Returns
A promise that will be resolved with {temperature, pressure, altitude}
Description
Read temperature, pressure and altitude data. A promise is returned which will
be resolved with {temperature, pressure, altitude}
.
If the Barometer has been turned on with Bangle.setBarometerPower
then this
will return with the next reading as of 2v21 (or the existing reading on 2v20 or earlier). If the Barometer is off,
conversions take between 500-750ms.
Altitude assumes a sea-level pressure of 1013.25 hPa
If there's no pressure device (for example, the emulator),
this returns undefined
, rather than a Promise.
Bangle.getPressure().then(d=>{
console.log(d);
// {temperature, pressure, altitude}
});
Note: This is only available in DTNO1_F5 and Bangle.js 2 smartwatches and DICKENS
Bangle.getStepCount ⇒
Call type:
Bangle.getStepCount()
Returns
The number of steps recorded by the step counter
Description
Returns the current amount of steps recorded by the step counter
Note: This is only available in Bangle.js smartwatches
event Bangle.GPS ⇒
Call type:
Bangle.on('GPS', function(fix) { ... });
Parameters
fix
- An object with fix info (see below)
Description
GPS data, as an object. Contains:
{ "lat": number, // Latitude in degrees
"lon": number, // Longitude in degrees
"alt": number, // altitude in M
"speed": number, // Speed in kph
"course": number, // Course in degrees
"time": Date, // Current Time (or undefined if not known)
"satellites": 7, // Number of satellites
"fix": 1 // NMEA Fix state - 0 is no fix
"hdop": number, // Horizontal Dilution of Precision
}
If a value such as lat
is not known because there is no fix, it'll be NaN
.
hdop
is a value from the GPS receiver that gives a rough idea of accuracy of
lat/lon based on the geometry of the satellites in range. Multiply by 5 to get a
value in meters. This is just a ballpark estimation and should not be considered
remotely accurate.
To get this event you must turn the GPS on with Bangle.setGPSPower(1)
.
Note: This is only available in Bangle.js smartwatches
event Bangle.GPS-raw ⇒
Call type:
Bangle.on('GPS-raw', function(nmea, dataLoss) { ... });
Parameters
nmea
- A string containing the raw NMEA data from the GPS
dataLoss
- This is set to true if some lines of GPS data have previously been lost (eg because system was too busy to queue up a GPS-raw event)
Description
Raw NMEA GPS / u-blox data messages received as a string
To get this event you must turn the GPS on with Bangle.setGPSPower(1)
.
Note: This is only available in Bangle.js smartwatches
event Bangle.health ⇒
Call type:
Bangle.on('health', function(info) { ... });
Parameters
info
- An object containing the last 10 minutes health data
Description
See Bangle.getHealthStatus()
for more information. This is used for health
tracking to allow Bangle.js to record historical exercise data.
Note: This is only available in Bangle.js smartwatches
event Bangle.HRM ⇒
Call type:
Bangle.on('HRM', function(hrm) { ... });
Parameters
hrm
- An object with heart rate info (see below)
Description
Heat rate data, as an object. Contains:
{ "bpm": number, // Beats per minute
"confidence": number, // 0-100 percentage confidence in the heart rate
"raw": Uint8Array, // raw samples from heart rate monitor
}
To get this event you must turn the heart rate monitor on with
Bangle.setHRMPower(1)
.
Note: This is only available in Bangle.js smartwatches
event Bangle.HRM-env ⇒
Call type:
Bangle.on('HRM-env', function(env) { ... });
Parameters
env
- An integer containing current environment reading (light level)
Description
Called when an environment sample heart rate sensor data is available (this is the amount of light received by the HRM sensor from the environment when its LED is off). On the newest VC31B based watches this is only 4 bit (0..15).
To get it you need to turn the HRM on with Bangle.setHRMPower(1)
and also set Bangle.setOptions({hrmPushEnv:true})
.
It is also possible to poke registers with Bangle.hrmWr
to increase the poll rate if needed. See https://banglejs.com/apps/?id=flashcount for an example of this.
Note: This is only available in Bangle.js 2 smartwatches
event Bangle.HRM-raw ⇒
Call type:
Bangle.on('HRM-raw', function(hrm) { ... });
Parameters
hrm
- A object containing instant readings from the heart rate sensor
Description
Called when heart rate sensor data is available - see Bangle.setHRMPower(1)
.
hrm
is of the form:
{ "raw": -1, // raw value from sensor
"filt": -1, // bandpass-filtered raw value from sensor
"bpm": 88.9, // last BPM value measured
"confidence": 0 // confidence in the BPM value
}
Note: This is only available in Bangle.js smartwatches
Bangle.hrmRd ⇒
Call type:
Bangle.hrmRd(reg, cnt)
Parameters
reg
-
cnt
- If specified, returns an array of the given length (max 128). If not (or 0) it returns a number
Returns
See description above
Description
Read a register on the Heart rate monitor
Note: This is only available in Bangle.js smartwatches
Bangle.hrmWr ⇒
Call type:
Bangle.hrmWr(reg, data)
Parameters
reg
-
data
-
Description
Writes a register on the Heart rate monitor
Note: This is only available in Bangle.js 2 smartwatches
Bangle.ioWr ⇒
Call type:
Bangle.ioWr(mask, isOn)
Parameters
mask
-
isOn
-
Description
Changes a pin state on the IO expander
Note: This is only available in Bangle.js 1 smartwatches
Bangle.isBacklightOn ⇒
Call type:
Bangle.isBacklightOn()
Returns
Is the backlight on or not?
Description
Also see the Bangle.backlight
event
Note: This is only available in Bangle.js smartwatches
Bangle.isBarometerOn ⇒
Call type:
Bangle.isBarometerOn()
Returns
Is the Barometer on?
Description
Is the Barometer powered?
Set power with Bangle.setBarometerPower(...);
Note: This is only available in DTNO1_F5 and Bangle.js 2 smartwatches and DICKENS
Bangle.isCharging ⇒
Call type:
Bangle.isCharging()
Returns
Is the battery charging or not?
Bangle.isCompassOn ⇒
Call type:
Bangle.isCompassOn()
Returns
Is the Compass on?
Description
Is the compass powered?
Set power with Bangle.setCompassPower(...);
Note: This is only available in Bangle.js smartwatches
Bangle.isGPSOn ⇒
Call type:
Bangle.isGPSOn()
Returns
Is the GPS on?
Description
Is the GPS powered?
Set power with Bangle.setGPSPower(...);
Note: This is only available in Bangle.js smartwatches
Bangle.isHRMOn ⇒
Call type:
Bangle.isHRMOn()
Returns
Is HRM on?
Description
Is the Heart rate monitor powered?
Set power with Bangle.setHRMPower(...);
Note: This is only available in Bangle.js smartwatches
Bangle.isLCDOn ⇒
Call type:
Bangle.isLCDOn()
Returns
Is the display on or not?
Description
Also see the Bangle.lcdPower
event
Note: This is only available in Bangle.js smartwatches
Bangle.isLocked ⇒
Call type:
Bangle.isLocked()
Returns
Is the screen locked or not?
Description
Also see the Bangle.lock
event
Note: This is only available in Bangle.js smartwatches
event Bangle.lcdPower ⇒
Call type:
Bangle.on('lcdPower', function(on) { ... });
Parameters
on
- true
if screen is on
Description
Has the screen been turned on or off? Can be used to stop tasks that are no
longer useful if nothing is displayed. Also see Bangle.isLCDOn()
Note: This is only available in Bangle.js smartwatches
Bangle.lcdWr ⇒
Call type:
Bangle.lcdWr(cmd, data)
Parameters
cmd
-
data
-
Description
Writes a command directly to the ST7735 LCD controller
Note: This is only available in Bangle.js smartwatches
Bangle.load ⇒
Call type:
Bangle.load(file)
Parameters
file
- [optional] A string containing the file name for the app to be loaded
Description
This behaves the same as the global load()
function, but if fast
loading is possible (Bangle.setUI
was called with a remove
handler)
then instead of a complete reload, the remove
handler will be
called and the new app will be loaded straight after with eval
.
This should only be used if the app being loaded also uses widgets
(eg it contains a Bangle.loadWidgets()
call).
load()
is slower, but safer. As such, care should be taken
when using Bangle.load()
with Bangle.setUI({..., remove:...})
as if your remove handler doesn't completely clean up after your app,
memory leaks or other issues could occur - see Bangle.setUI
for more
information.
Note: This is only available in Bangle.js smartwatches
Bangle.loadWidgets ⇒
Call type:
Bangle.loadWidgets()
Description
Load all widgets from flash Storage. Call this once at the beginning of your application if you want any on-screen widgets to be loaded.
They will be loaded into a global WIDGETS
array, and can be rendered with
Bangle.drawWidgets
.
Note: This is only available in Bangle.js smartwatches
event Bangle.lock ⇒
Call type:
Bangle.on('lock', function(on, reason) { ... });
Parameters
on
- true
if screen is locked, false
if it is unlocked and touchscreen/buttons will work
reason
- (2v20 onwards) If known, the reason for locking/unlocking - 'button','js','tap','doubleTap','faceUp','twist','timeout'
Description
Has the screen been locked? Also see Bangle.isLocked()
Note: This is only available in Bangle.js smartwatches
event Bangle.mag ⇒
Call type:
Bangle.on('mag', function(xyz) { ... });
Parameters
xyz
-
Description
Magnetometer/Compass data available with {x,y,z,dx,dy,dz,heading}
object as a
parameter
x/y/z
raw x,y,z magnetometer readingsdx/dy/dz
readings based on calibration since magnetometer turned onheading
in degrees based on calibrated readings (will be NaN if magnetometer hasn't been rotated around 360 degrees).
Note: In 2v15 firmware and earlier the heading is inverted (360-heading). There's a fix in the bootloader which will apply a fix for those headings, but old apps may still expect an inverted value.
To get this event you must turn the compass on with Bangle.setCompassPower(1)
.
You can also retrieve the most recent reading with Bangle.getCompass()
.
Note: This is only available in Bangle.js smartwatches
event Bangle.midnight ⇒
Call type:
Bangle.on('midnight', function() { ... });
Description
Emitted at midnight (at the point the day
health info is reset to 0).
Can be used for housekeeping tasks that don't want to be run during the day.
Note: This is only available in Bangle.js smartwatches
Bangle.off ⇒
Call type:
Bangle.off()
Description
Turn Bangle.js off. It can only be woken by pressing BTN1.
Note: This is only available in Bangle.js smartwatches
event Bangle.pressure ⇒
Call type:
Bangle.on('pressure', function(e) { ... });
Parameters
e
- An object containing {temperature,pressure,altitude}
Description
When Bangle.setBarometerPower(true)
is called, this event is fired containing
barometer readings.
Same format as Bangle.getPressure()
Note: This is only available in Bangle.js smartwatches
Bangle.project ⇒
Call type:
Bangle.project(latlong)
Parameters
latlong
- {lat:..., lon:...}
Returns
{x:..., y:...}
Description
Perform a Spherical Web Mercator
projection of latitude
and longitude into x
and y
coordinates, which are roughly equivalent to
meters from {lat:0,lon:0}
.
This is the formula used for most online mapping and is a good way to compare GPS coordinates to work out the distance between them.
Note: This is only available in Bangle.js smartwatches
Bangle.resetCompass ⇒
Call type:
Bangle.resetCompass()
Parameters
Description
Resets the compass minimum/maximum values. Can be used if the compass isn't providing a reliable heading any more.
Note: This is only available in Bangle.js smartwatches
Bangle.setBacklight ⇒
Call type:
Bangle.setBacklight(isOn)
Parameters
isOn
- True if the LCD backlight should be on, false if not
Description
This function can be used to turn Bangle.js's LCD backlight off or on.
This function resets the Bangle's 'activity timer' (like pressing a button or
the screen would) so after a time period of inactivity set by
Bangle.setOptions({backlightTimeout: X});
the backlight will turn off.
If you want to keep the backlight on permanently (until apps are changed) you can do:
Bangle.setOptions({backlightTimeout: 0}) // turn off the timeout
Bangle.setBacklight(1); // keep screen on
Of course, the backlight depends on Bangle.setLCDPower
too, so any lcdPowerTimeout/setLCDTimeout will
also turn the backlight off. The use case is when you require the backlight timeout
to be shorter than the power timeout.
Note: This is only available in Bangle.js smartwatches
Bangle.setBarometerPower ⇒
Call type:
Bangle.setBarometerPower(isOn, appID)
Parameters
isOn
- True if the barometer IC should be on, false if not
appID
- A string with the app's name in, used to ensure one app can't turn off something another app is using
Returns
Is the Barometer on?
Description
Set the power to the barometer IC. Once enabled, Bangle.pressure
events are
fired each time a new barometer reading is available.
When on, the barometer draws roughly 50uA
Note: This is only available in DTNO1_F5 and Bangle.js 2 smartwatches and DICKENS
Bangle.setCompassPower ⇒
Call type:
Bangle.setCompassPower(isOn, appID)
Parameters
isOn
- True if the Compass should be on, false if not
appID
- A string with the app's name in, used to ensure one app can't turn off something another app is using
Returns
Is the Compass on?
Description
Set the power to the Compass
When on, data is output via the mag
event on Bangle
:
Bangle.setCompassPower(true, "myapp");
Bangle.on('mag',print);
When on, the compass draws roughly 2mA
Note: This is only available in Bangle.js smartwatches
Bangle.setGPSPower ⇒
Call type:
Bangle.setGPSPower(isOn, appID)
Parameters
isOn
- True if the GPS should be on, false if not
appID
- A string with the app's name in, used to ensure one app can't turn off something another app is using
Returns
Is the GPS on?
Description
Set the power to the GPS.
When on, data is output via the GPS
event on Bangle
:
Bangle.setGPSPower(true, "myapp");
Bangle.on('GPS',print);
When on, the GPS draws roughly 20mA
Note: This is only available in Bangle.js smartwatches
Bangle.setHRMPower ⇒
Call type:
Bangle.setHRMPower(isOn, appID)
Parameters
isOn
- True if the heart rate monitor should be on, false if not
appID
- A string with the app's name in, used to ensure one app can't turn off something another app is using
Returns
Is HRM on?
Description
Set the power to the Heart rate monitor
When on, data is output via the HRM
event on Bangle
:
Bangle.setHRMPower(true, "myapp");
Bangle.on('HRM',print);
When on, the Heart rate monitor draws roughly 5mA
Note: This is only available in Bangle.js smartwatches
Bangle.setLCDBrightness ⇒
Call type:
Bangle.setLCDBrightness(brightness)
Parameters
brightness
- The brightness of Bangle.js's display - from 0(off) to 1(on full)
Description
This function can be used to adjust the brightness of Bangle.js's display, and hence prolong its battery life.
Due to hardware design constraints, software PWM has to be used which means that the display may flicker slightly when Bluetooth is active and the display is not at full power.
Power consumption
- 0 = 7mA
- 0.1 = 12mA
- 0.2 = 18mA
- 0.5 = 28mA
- 0.9 = 40mA (switching overhead)
- 1 = 40mA
Note: This is only available in Bangle.js smartwatches
Bangle.setLCDMode ⇒
Call type:
Bangle.setLCDMode(mode)
Parameters
mode
- The LCD mode (See below)
Description
This function can be used to change the way graphics is handled on Bangle.js.
Available options for Bangle.setLCDMode
are:
Bangle.setLCDMode()
orBangle.setLCDMode("direct")
(the default) - The drawable area is 240x240 16 bit. Unbuffered, so draw calls take effect immediately. Terminal and vertical scrolling work (horizontal scrolling doesn't).Bangle.setLCDMode("doublebuffered")
- The drawable area is 240x160 16 bit, terminal and scrolling will not work.g.flip()
must be called for draw operations to take effect.Bangle.setLCDMode("120x120")
- The drawable area is 120x120 8 bit,g.getPixel
, terminal, and full scrolling work. Uses an offscreen buffer stored on Bangle.js,g.flip()
must be called for draw operations to take effect.Bangle.setLCDMode("80x80")
- The drawable area is 80x80 8 bit,g.getPixel
, terminal, and full scrolling work. Uses an offscreen buffer stored on Bangle.js,g.flip()
must be called for draw operations to take effect.
You can also call Bangle.setLCDMode()
to return to normal, unbuffered
"direct"
mode.
Note: This is only available in Bangle.js smartwatches
Bangle.setLCDOffset ⇒
Call type:
Bangle.setLCDOffset(y)
Parameters
y
- The amount of pixels to shift the LCD up or down
Description
This can be used to move the displayed memory area up or down temporarily. It's used for displaying notifications while keeping the main display contents intact.
Note: This is only available in Bangle.js smartwatches
Bangle.setLCDOverlay ⇒
Call type:
Bangle.setLCDOverlay(img, x, y)
Parameters
img
- An image, or undefined to clear
x
- The X offset the graphics instance should be overlaid on the screen with
y
- The Y offset the graphics instance should be overlaid on the screen with
Description
Overlay an image or graphics instance on top of the contents of the graphics buffer.
This only works on Bangle.js 2 because Bangle.js 1 doesn't have an offscreen buffer accessible from the CPU.
// display an alarm clock icon on the screen
var img = require("heatshrink").decompress(atob(`lss4UBvvv///ovBlMyqoADv/VAwlV//1qtfAQX/BINXDoPVq/9DAP
/AYIKDrWq0oREAYPW1QAB1IWCBQXaBQWq04WCAQP6BQeqA4P1AQPq1WggEK1WrBAIkBBQJsCBYO///fBQOoPAcqCwP3BQnwgECCwP9
GwIKCngWC14sB7QKCh4CBCwN/64KDgfACwWn6vWGwYsBCwOputWJgYsCgGqytVBQYsCLYOlqtqwAsFEINVrR4BFgghBBQosDEINWIQ
YsDEIQ3DFgYhCG4msSYeVFgnrFhMvOAgsEkE/FhEggYWCFgIhDkEACwQKBEIYKBCwSGFBQJxCQwYhBBQTKDqohCBQhCCEIJlDXwrKE
BQoWHBQdaCwuqJoI4CCwgKECwJ9CJgIKDq+qBYUq1WtBQf+BYIAC3/VBQX/tQKDz/9BQY5BAAVV/4WCBQJcBKwVf+oHBv4wCAAYhB`));
Bangle.setLCDOverlay(img,66,66);
Or use a Graphics
instance:
var ovr = Graphics.createArrayBuffer(100,100,1,{msb:true}); // 1bpp
ovr.drawLine(0,0,100,100);
ovr.drawRect(0,0,99,99);
Bangle.setLCDOverlay(ovr,38,38);
Although Graphics
can be specified directly, it can often make more sense to
create an Image from the Graphics
instance, as this gives you access
to color palettes and transparent colors. For instance this will draw a colored
overlay with rounded corners:
var ovr = Graphics.createArrayBuffer(100,100,2,{msb:true});
ovr.setColor(1).fillRect({x:0,y:0,w:99,h:99,r:8});
ovr.setColor(3).fillRect({x:2,y:2,w:95,h:95,r:7});
ovr.setColor(2).setFont("Vector:30").setFontAlign(0,0).drawString("Hi",50,50);
Bangle.setLCDOverlay({
width:ovr.getWidth(), height:ovr.getHeight(),
bpp:2, transparent:0,
palette:new Uint16Array([0,0,g.toColor("#F00"),g.toColor("#FFF")]),
buffer:ovr.buffer
},38,38);
Note: This is only available in Bangle.js 2 smartwatches and DICKENS
Bangle.setLCDPower ⇒
Call type:
Bangle.setLCDPower(isOn)
Parameters
isOn
- True if the LCD should be on, false if not
Description
This function can be used to turn Bangle.js's LCD off or on.
This function resets the Bangle's 'activity timer' (like pressing a button or
the screen would) so after a time period of inactivity set by
Bangle.setLCDTimeout
the screen will turn off.
If you want to keep the screen on permanently (until apps are changed) you can do:
Bangle.setLCDTimeout(0); // turn off the timeout
Bangle.setLCDPower(1); // keep screen on
When on full, the LCD draws roughly 40mA. You can adjust When brightness
using Bangle.setLCDBrightness
.
Note: This is only available in Bangle.js smartwatches
Bangle.setLCDRotation ⇒
Call type:
Bangle.setLCDRotation(d)
Parameters
d
- The number of degrees to the LCD display (0, 90, 180 or 270)
Description
Sets the rotation of the LCD display (relative to its nominal orientation)
Note: This is only available in Bangle.js smartwatches
Bangle.setLCDTimeout ⇒
Call type:
Bangle.setLCDTimeout(isOn)
Parameters
isOn
- The timeout of the display in seconds, or 0
/undefined
to turn power saving off. Default is 10 seconds.
Description
This function can be used to turn Bangle.js's LCD power saving on or off.
With power saving off, the display will remain in the state you set it with
Bangle.setLCDPower
.
With power saving on, the display will turn on if a button is pressed, the watch
is turned face up, or the screen is updated (see Bangle.setOptions
for
configuration). It'll turn off automatically after the given timeout.
Note: This function also sets the Backlight and Lock timeout (the time at
which the touchscreen/buttons start being ignored). To set both separately, use
Bangle.setOptions
Note: This is only available in Bangle.js smartwatches
Bangle.setLocked ⇒
Call type:
Bangle.setLocked(isLocked)
Parameters
isLocked
- true
if the Bangle is locked (no user input allowed)
Description
This function can be used to lock or unlock Bangle.js (e.g. whether buttons and touchscreen work or not)
Note: This is only available in Bangle.js smartwatches
Bangle.setOptions ⇒
Call type:
Bangle.setOptions(options)
Parameters
options
-
Description
Set internal options used for gestures, etc...
wakeOnBTN1
should the LCD turn on when BTN1 is pressed? default =true
wakeOnBTN2
(Bangle.js 1) should the LCD turn on when BTN2 is pressed? default =true
wakeOnBTN3
(Bangle.js 1) should the LCD turn on when BTN3 is pressed? default =true
wakeOnFaceUp
should the LCD turn on when the watch is turned face up? default =false
wakeOnTouch
should the LCD turn on when the touchscreen is pressed? On Bangle.js 1 this is a physical press on the touchscreen, on Bangle.js 2 we have to use the accelerometer as the touchscreen cannot be left powered without running the battery down. default =false
wakeOnDoubleTap
(2v20 onwards) should the LCD turn on when the watch is double-tapped on the screen? This uses the accelerometer, not the touchscreen itself. default =false
wakeOnTwist
should the LCD turn on when the watch is twisted? default =true
twistThreshold
How much acceleration to register a twist of the watch strap? Can be negative for opposite direction. default =800
twistMaxY
Maximum acceleration in Y to trigger a twist (low Y means watch is facing the right way up). default =-800
twistTimeout
How little time (in ms) must a twist take from low->high acceleration? default =1000
gestureStartThresh
how big a difference before we consider a gesture started? default =sqr(800)
gestureEndThresh
how small a difference before we consider a gesture ended? default =sqr(2000)
gestureInactiveCount
how many samples do we keep after a gesture has ended? default =4
gestureMinLength
how many samples must a gesture have before we notify about it? default =10
powerSave
after a minute of not being moved, Bangle.js will change the accelerometer poll interval down to 800ms (10x accelerometer samples). On movement it'll be raised to the default 80ms. IfBangle.setPollInterval
is used this is disabled, and for it to work the poll interval must be either 80ms or 800ms. default =true
. SettingpowerSave:false
will disable this automatic power saving, but will not change the poll interval from its current value. If you desire a specific interval (e.g. the default 80ms) you must set it manually withBangle.setPollInterval(80)
after settingpowerSave:false
.lockTimeout
how many milliseconds before the screen lockslcdPowerTimeout
how many milliseconds before the screen turns offbacklightTimeout
how many milliseconds before the screen's backlight turns offbtnLoadTimeout
how many milliseconds does the home button have to be pressed for before the clock is reloaded? 1500ms default, or 0 means never.hrmPollInterval
set the requested poll interval (in milliseconds) for the heart rate monitor. On Bangle.js 2 only 10,20,40,80,160,200 ms are supported, and polling rate may not be exact. The algorithm's filtering is tuned for 20-40ms poll intervals, so higher/lower intervals may effect the reliability of the BPM reading. You must call this beforeBangle.setHRMPower
- calling when the HRM is already on will not affect the poll rate.hrmSportMode
- on the newest Bangle.js 2 builds with with the proprietary heart rate algorithm, this is the sport mode passed to the algorithm. Seelibs/misc/vc31_binary/algo.h
for more info. -1 = auto, 0 = normal (default), 1 = running, 2 = ...hrmGreenAdjust
- (Bangle.js 2, 2v19+) if false (default is true) the green LED intensity won't be adjusted to get the HRM sensor 'exposure' correct. This is reset when the HRM is initialised withBangle.setHRMPower
.hrmWearDetect
- (Bangle.js 2, 2v19+) if false (default is true) HRM readings won't be turned off if the watch isn't on your arm (based on HRM proximity sensor). This is reset when the HRM is initialised withBangle.setHRMPower
.hrmPushEnv
- (Bangle.js 2, 2v19+) if true (default is false) HRM environment readings will be produced asBangle.on(
HRM-env, ...)
events. This is reset when the HRM is initialised withBangle.setHRMPower
.seaLevelPressure
(Bangle.js 2) Normally 1013.25 millibars - this is used for calculating altitude with the pressure sensorlcdBufferPtr
(Bangle.js 2 2v21+) Return a pointer to the first pixel of the 3 bit graphics buffer used by Bangle.js for the screen (stride = 178 bytes)
Where accelerations are used they are in internal units, where 8192 = 1g
Note: This is only available in Bangle.js smartwatches
Bangle.setPollInterval ⇒
Call type:
Bangle.setPollInterval(interval)
Parameters
interval
- Polling interval in milliseconds (Default is 80ms - 12.5Hz to match accelerometer)
Description
Set how often the watch should poll its sensors (accel/hr/mag) for new data and kick the Watchdog timer. It isn't recommended that you make this interval much larger than 1000ms, but values up to 4000ms are allowed.
Calling this will set Bangle.setOptions({powerSave: false})
- disabling the
dynamic adjustment of poll interval to save battery power when Bangle.js is
stationary.
Note: This is only available in Bangle.js smartwatches
Bangle.setStepCount ⇒
Call type:
Bangle.setStepCount(count)
Parameters
count
- The value with which to reload the step counter
Description
Sets the current value of the step counter
Note: This is only available in Bangle.js smartwatches
Bangle.setUI ⇒
Call type:
Bangle.setUI(type, callback)
Parameters
type
- The type of UI input: 'updown', 'leftright', 'clock', 'clockupdown' or undefined to cancel. Can also be an object (see below)
callback
- A function with one argument which is the direction
Description
This puts Bangle.js into the specified UI input mode, and calls the callback provided when there is user input.
Currently supported interface types are:
- 'updown' - UI input with upwards motion
cb(-1)
, downwards motioncb(1)
, and selectcb()
- Bangle.js 1 uses BTN1/3 for up/down and BTN2 for select
- Bangle.js 2 uses touchscreen swipe up/down and tap
- 'leftright' - UI input with left motion
cb(-1)
, right motioncb(1)
, and selectcb()
- Bangle.js 1 uses BTN1/3 for left/right and BTN2 for select
- Bangle.js 2 uses touchscreen swipe left/right and tap/BTN1 for select
- 'clock' - called for clocks. Sets
Bangle.CLOCK=1
and allows a button to start the launcher- Bangle.js 1 BTN2 starts the launcher
- Bangle.js 2 BTN1 starts the launcher
- 'clockupdown' - called for clocks. Sets
Bangle.CLOCK=1
, allows a button to start the launcher, but also provides up/down functionality- Bangle.js 1 BTN2 starts the launcher, BTN1/BTN3 call
cb(-1)
andcb(1)
- Bangle.js 2 BTN1 starts the launcher, touchscreen tap in top/bottom right
hand side calls
cb(-1)
andcb(1)
- Bangle.js 1 BTN2 starts the launcher, BTN1/BTN3 call
{mode:"custom", ...}
allows you to specify custom handlers for different interactions. See below.undefined
removes all user interaction code
While you could use setWatch/etc manually, the benefit here is that you don't
end up with multiple setWatch
instances, and the actual input method (touch,
or buttons) is implemented dependent on the watch (Bangle.js 1 or 2)
Note: You can override this function in boot code to change the interaction mode with the watch. For instance you could make all clocks start the launcher with a swipe by using:
(function() {
var sui = Bangle.setUI;
Bangle.setUI = function(mode, cb) {
var m = ("object"==typeof mode) ? mode.mode : mode;
if (m!="clock") return sui(mode,cb);
sui(); // clear
Bangle.CLOCK=1;
Bangle.swipeHandler = Bangle.showLauncher;
Bangle.on("swipe", Bangle.swipeHandler);
};
})();
The first argument can also be an object, in which case more options can be specified:
Bangle.setUI({
mode : "custom",
back : function() {}, // optional - add a 'back' icon in top-left widget area and call this function when it is pressed , also call it when the hardware button is clicked (does not override btn if defined)
remove : function() {}, // optional - add a handler for when the UI should be removed (eg stop any intervals/timers here)
redraw : function() {}, // optional - add a handler to redraw the UI. Not needed but it can allow widgets/etc to provide other functionality that requires the screen to be redrawn
touch : function(n,e) {}, // optional - (mode:custom only) handler for 'touch' events
swipe : function(dir) {}, // optional - (mode:custom only) handler for 'swipe' events
drag : function(e) {}, // optional - (mode:custom only) handler for 'drag' events (Bangle.js 2 only)
btn : function(n) {}, // optional - (mode:custom only) handler for 'button' events (n==1 on Bangle.js 2, n==1/2/3 depending on button for Bangle.js 1)
clock : 0 // optional - if set the behavior of 'clock' mode is added (does not override btn if defined)
});
If remove
is specified, Bangle.showLauncher
, Bangle.showClock
, Bangle.load
and some apps
may choose to just call the remove
function and then load a new app without resetting Bangle.js.
As a result, if you specify 'remove' you should make sure you test that after calling Bangle.setUI()
without arguments your app is completely unloaded, otherwise you may end up with memory leaks or
other issues when switching apps. Please see http://www.espruino.com/Bangle.js+Fast+Load for more details on this.
Note: This is only available in Bangle.js smartwatches
Note: This is only available in Bangle.js smartwatches with DICKENS
Bangle.showClock ⇒
Call type:
Bangle.showClock()
Description
Load the Bangle.js clock - this has the same effect as calling Bangle.load()
.
Note: This is only available in Bangle.js smartwatches
Bangle.showLauncher ⇒
Call type:
Bangle.showLauncher()
Description
Load the Bangle.js app launcher, which will allow the user to select an application to launch.
Note: This is only available in Bangle.js smartwatches
Bangle.showRecoveryMenu ⇒
Call type:
Bangle.showRecoveryMenu()
Description
Show a 'recovery' menu that allows you to perform certain tasks on your Bangle.
You can also enter this menu by restarting your Bangle while holding down the button.
Note: This is only available in Bangle.js smartwatches
Note: This is only available in Bangle.js smartwatches with Bangle.js 1 smartwatches
Bangle.showTestScreen ⇒
Call type:
Bangle.showTestScreen()
Description
(2v20 and later) Show a test screen that lights green when each sensor on the Bangle works and reports within range.
Swipe on the screen when all items are green and the Bangle will turn bluetooth off
and display a TEST PASS
screen for 60 minutes, after which it will turn off.
You can enter this menu by restarting your Bangle while holding down the button,
then choosing Test
from the recovery menu.
Note: This is only available in Bangle.js 2 smartwatches
Bangle.softOff ⇒
Call type:
Bangle.softOff()
Description
Turn Bangle.js (mostly) off, but keep the CPU in sleep mode until BTN1 is pressed to preserve the RTC (current time).
Note: This is only available in Bangle.js smartwatches
event Bangle.step ⇒
Call type:
Bangle.on('step', function(up) { ... });
Parameters
up
- The number of steps since Bangle.js was last reset
Description
Called whenever a step is detected by Bangle.js's pedometer.
Note: This is only available in Bangle.js smartwatches
event Bangle.stroke ⇒
Call type:
Bangle.on('stroke', function(event) { ... });
Parameters
event
- Object of form {xy:Uint8Array([x1,y1,x2,y2...])}
containing touch coordinates
Description
Emitted when the touchscreen is dragged for a large enough distance to count as a gesture.
If Bangle.strokes is defined and populated with data from Unistroke.new
, the
event
argument will also contain a stroke
field containing the most closely
matching stroke name.
For example:
Bangle.strokes = {
up : Unistroke.new(new Uint8Array([57, 151, ... 158, 137])),
alpha : Unistroke.new(new Uint8Array([161, 55, ... 159, 161])),
};
Bangle.on('stroke',o=>{
print(o.stroke);
g.clear(1).drawPoly(o.xy);
});
// Might print something like
{
"xy": new Uint8Array([149, 50, ... 107, 136]),
"stroke": "alpha"
}
Note: This is only available in Bangle.js 2 smartwatches
event Bangle.swipe ⇒
Call type:
Bangle.on('swipe', function(directionLR, directionUD) { ... });
Parameters
directionLR
- -1
for left, 1
for right, 0
for up/down
directionUD
- -1
for up, 1
for down, 0
for left/right (Bangle.js 2 only)
Description
Emitted when a swipe on the touchscreen is detected (a movement from left->right, right->left, down->up or up->down)
Bangle.js 1 is only capable of detecting left/right swipes as it only contains a 2 zone touchscreen.
Note: This is only available in Bangle.js smartwatches
event Bangle.tap ⇒
Call type:
Bangle.on('tap', function(data) { ... });
Parameters
data
- {dir, double, x, y, z}
Description
If the watch is tapped, this event contains information on the way it was tapped.
dir
reports the side of the watch that was tapped (not the direction it was
tapped in).
{
dir : "left/right/top/bottom/front/back",
double : true/false // was this a double-tap?
x : -2 .. 2, // the axis of the tap
y : -2 .. 2, // the axis of the tap
z : -2 .. 2 // the axis of the tap
Note: This is only available in Bangle.js smartwatches
event Bangle.touch ⇒
Call type:
Bangle.on('touch', function(button, xy) { ... });
Parameters
button
- 1
for left, 2
for right
xy
- Object of form {x,y,type}
containing touch coordinates (if the device supports full touch). Clipped to 0..175 (LCD pixel coordinates) on firmware 2v13 and later.type
is only available on Bangle.js 2 and is an integer, either 0 for swift touches or 2 for longer ones.
Description
Emitted when the touchscreen is pressed
Note: This is only available in Bangle.js smartwatches
event Bangle.twist ⇒
Call type:
Bangle.on('twist', function() { ... });
Description
This event happens when the watch has been twisted around it's axis - for instance as if it was rotated so someone could look at the time.
To tweak when this happens, see the twist*
options in Bangle.setOptions()
Note: This is only available in Bangle.js smartwatches
BluetoothDevice Class
A Web Bluetooth-style device - you can request one using
NRF.requestDevice(address)
For example:
var gatt;
NRF.requestDevice({ filters: [{ name: 'Puck.js abcd' }] }).then(function(device) {
console.log("found device");
return device.gatt.connect();
}).then(function(g) {
gatt = g;
console.log("connected");
return gatt.startBonding();
}).then(function() {
console.log("bonded", gatt.getSecurityStatus());
gatt.disconnect();
}).catch(function(e) {
console.log("ERROR",e);
});
Methods and Fields
- property BluetoothDevice.gatt
- event BluetoothDevice.gattserverdisconnected(reason)
- event BluetoothDevice.passkey(passkey)
- event BluetoothDevice.passkeyRequest()
- property BluetoothDevice.rssi
- function BluetoothDevice.sendPasskey(passkey)
property BluetoothDevice.gatt ⇒
Call type:
property BluetoothDevice.gatt
Returns
A BluetoothRemoteGATTServer
for this device
event BluetoothDevice.gattserverdisconnected ⇒
Call type:
BluetoothDevice.on('gattserverdisconnected', function(reason) { ... });
Parameters
reason
- The reason code reported back by the BLE stack - see Nordic's ble_hci.h
file for more information
Description
Called when the device gets disconnected.
To connect and then print Disconnected
when the device is disconnected, just
do the following:
var gatt;
NRF.connect("aa:bb:cc:dd:ee:ff").then(function(gatt) {
gatt.device.on('gattserverdisconnected', function(reason) {
console.log("Disconnected ",reason);
});
});
Or:
var gatt;
NRF.requestDevice(...).then(function(device) {
device.on('gattserverdisconnected', function(reason) {
console.log("Disconnected ",reason);
});
});
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
event BluetoothDevice.passkey ⇒
Call type:
BluetoothDevice.on('passkey', function(passkey) { ... });
Parameters
passkey
- A 6 character numeric String to be displayed
Description
Called when the device pairs and sends a passkey that Espruino should display.
For this to be used, you'll have to specify that there's a display using
NRF.setSecurity
This is not part of the Web Bluetooth Specification. It has been added specifically for Espruino.
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
event BluetoothDevice.passkeyRequest ⇒
Call type:
BluetoothDevice.on('passkeyRequest', function() { ... });
Description
Called when the device pairs, displays a passkey, and wants Espruino to tell it what the passkey was.
Respond with BluetoothDevice.sendPasskey("123456")
with a 6 character string
containing only 0..9
.
For this to be used, you'll have to specify that there's a keyboard using
NRF.setSecurity
This is not part of the Web Bluetooth Specification. It has been added specifically for Espruino.
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
property BluetoothDevice.rssi ⇒
Call type:
property BluetoothDevice.rssi
Returns
The last received RSSI (signal strength) for this device
function BluetoothDevice.sendPasskey ⇒
Call type:
function BluetoothDevice.sendPasskey(passkey)
Parameters
passkey
- A 6 character numeric String to be returned to the device
Description
To be used as a response when the event BluetoothDevice.sendPasskey
has been
received.
This is not part of the Web Bluetooth Specification. It has been added specifically for Espruino.
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
BluetoothRemoteGATTCharacteristic Class
Web Bluetooth-style GATT characteristic - get this using
BluetoothRemoteGATTService.getCharacteristic(s)
https://webbluetoothcg.github.io/web-bluetooth/#bluetoothremotegattcharacteristic
Methods and Fields
- event BluetoothRemoteGATTCharacteristic.characteristicvaluechanged()
- function BluetoothRemoteGATTCharacteristic.readValue()
- property BluetoothRemoteGATTCharacteristic.service
- function BluetoothRemoteGATTCharacteristic.startNotifications()
- function BluetoothRemoteGATTCharacteristic.stopNotifications()
- function BluetoothRemoteGATTCharacteristic.writeValue(data)
event BluetoothRemoteGATTCharacteristic.characteristicvaluechanged ⇒
Call type:
BluetoothRemoteGATTCharacteristic.on('characteristicvaluechanged', function() { ... });
Description
Called when a characteristic's value changes, after
BluetoothRemoteGATTCharacteristic.startNotifications
has been called.
...
return service.getCharacteristic("characteristic_uuid");
}).then(function(c) {
c.on('characteristicvaluechanged', function(event) {
console.log("-> "+event.target.value);
});
return c.startNotifications();
}).then(...
The first argument is of the form
{target :
BluetoothRemoteGATTCharacteristic}
, and
BluetoothRemoteGATTCharacteristic.value
will then contain the new value (as a
DataView).
Note: This is only available in devices with Bluetooth LE capability
function BluetoothRemoteGATTCharacteristic.readValue ⇒
Call type:
function BluetoothRemoteGATTCharacteristic.readValue()
Returns
Description
Read a characteristic's value, return a promise containing a DataView
var device;
NRF.connect(device_address).then(function(d) {
device = d;
return d.getPrimaryService("service_uuid");
}).then(function(s) {
console.log("Service ",s);
return s.getCharacteristic("characteristic_uuid");
}).then(function(c) {
return c.readValue();
}).then(function(d) {
console.log("Got:", JSON.stringify(d.buffer));
device.disconnect();
}).catch(function() {
console.log("Something's broken.");
});
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) and ESP32 boards
property BluetoothRemoteGATTCharacteristic.service ⇒
Call type:
property BluetoothRemoteGATTCharacteristic.service
Returns
The BluetoothRemoteGATTService
this Service came from
function BluetoothRemoteGATTCharacteristic.startNotifications ⇒
Call type:
function BluetoothRemoteGATTCharacteristic.startNotifications()
Returns
A Promise
that is resolved (or rejected) with data when notifications have been added
Description
Starts notifications - whenever this characteristic's value changes, a
characteristicvaluechanged
event is fired and characteristic.value
will then
contain the new value as a DataView
.
var device;
NRF.connect(device_address).then(function(d) {
device = d;
return d.getPrimaryService("service_uuid");
}).then(function(s) {
console.log("Service ",s);
return s.getCharacteristic("characteristic_uuid");
}).then(function(c) {
c.on('characteristicvaluechanged', function(event) {
console.log("-> ",event.target.value); // this is a DataView
});
return c.startNotifications();
}).then(function(d) {
console.log("Waiting for notifications");
}).catch(function() {
console.log("Something's broken.");
});
For example, to listen to the output of another Puck.js's Nordic Serial port service, you can use:
var gatt;
NRF.connect("pu:ck:js:ad:dr:es random").then(function(g) {
gatt = g;
return gatt.getPrimaryService("6e400001-b5a3-f393-e0a9-e50e24dcca9e");
}).then(function(service) {
return service.getCharacteristic("6e400003-b5a3-f393-e0a9-e50e24dcca9e");
}).then(function(characteristic) {
characteristic.on('characteristicvaluechanged', function(event) {
console.log("RX: "+JSON.stringify(event.target.value.buffer));
});
return characteristic.startNotifications();
}).then(function() {
console.log("Done!");
});
Note: This is only available in devices with Bluetooth LE capability
function BluetoothRemoteGATTCharacteristic.stopNotifications ⇒
Call type:
function BluetoothRemoteGATTCharacteristic.stopNotifications()
Returns
A Promise
that is resolved (or rejected) with data when notifications have been removed
Description
Stop notifications (that were requested with
BluetoothRemoteGATTCharacteristic.startNotifications
)
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
function BluetoothRemoteGATTCharacteristic.writeValue ⇒
Call type:
function BluetoothRemoteGATTCharacteristic.writeValue(data)
Parameters
data
- The data to write
Returns
A Promise
that is resolved (or rejected) when the characteristic is written
Description
Write a characteristic's value
var device;
NRF.connect(device_address).then(function(d) {
device = d;
return d.getPrimaryService("service_uuid");
}).then(function(s) {
console.log("Service ",s);
return s.getCharacteristic("characteristic_uuid");
}).then(function(c) {
return c.writeValue("Hello");
}).then(function(d) {
device.disconnect();
}).catch(function() {
console.log("Something's broken.");
});
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) and ESP32 boards
BluetoothRemoteGATTServer Class
Web Bluetooth-style GATT server - get this using NRF.connect(address)
or
NRF.requestDevice(options)
and response.gatt.connect
https://webbluetoothcg.github.io/web-bluetooth/#bluetoothremotegattserver
Methods and Fields
- function BluetoothRemoteGATTServer.connect(options)
- property BluetoothRemoteGATTServer.connected
- function BluetoothRemoteGATTServer.disconnect()
- function BluetoothRemoteGATTServer.getPrimaryService(service)
- function BluetoothRemoteGATTServer.getPrimaryServices()
- function BluetoothRemoteGATTServer.getSecurityStatus()
- property BluetoothRemoteGATTServer.handle
- function BluetoothRemoteGATTServer.setRSSIHandler(callback)
- function BluetoothRemoteGATTServer.startBonding(forceRePair)
function BluetoothRemoteGATTServer.connect ⇒
Call type:
function BluetoothRemoteGATTServer.connect(options)
Parameters
options
- [optional] (Espruino-specific) An object of connection options (see below)
Returns
A Promise
that is resolved (or rejected) when the connection is complete
Description
Connect to a BLE device - returns a promise, the argument of which is the
BluetoothRemoteGATTServer
connection.
See NRF.requestDevice
for usage examples.
options
is an optional object containing:
{
minInterval // min connection interval in milliseconds, 7.5 ms to 4 s
maxInterval // max connection interval in milliseconds, 7.5 ms to 4 s
}
By default the interval is 20-200ms (or 500-1000ms if
NRF.setLowPowerConnection(true)
was called. During connection Espruino
negotiates with the other device to find a common interval that can be used.
For instance calling:
NRF.requestDevice({ filters: [{ namePrefix: 'Pixl.js' }] }).then(function(device) {
return device.gatt.connect({minInterval:7.5, maxInterval:7.5});
}).then(function(g) {
will force the connection to use the fastest connection interval possible (as long as the device at the other end supports it).
Note: The Web Bluetooth spec states that if a device hasn't advertised its
name, when connected to a device the central (in this case Espruino) should
automatically retrieve the name from the corresponding characteristic (0x2a00
on service 0x1800
). Espruino does not automatically do this.
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) and ESP32 boards
property BluetoothRemoteGATTServer.connected ⇒
Call type:
property BluetoothRemoteGATTServer.connected
Returns
Whether the device is connected or not
function BluetoothRemoteGATTServer.disconnect ⇒
Call type:
function BluetoothRemoteGATTServer.disconnect()
Returns
A Promise
that is resolved (or rejected) when the disconnection is complete (non-standard)
Description
Disconnect from a previously connected BLE device connected with
BluetoothRemoteGATTServer.connect
- this does not disconnect from something
that has connected to the Espruino.
Note: While .disconnect
is standard Web Bluetooth, in the spec it returns
undefined not a Promise
for implementation reasons. In Espruino we return a
Promise
to make it easier to detect when Espruino is free to connect to
something else.
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) and ESP32 boards
function BluetoothRemoteGATTServer.getPrimaryService ⇒
Call type:
function BluetoothRemoteGATTServer.getPrimaryService(service)
Parameters
service
- The service UUID
Returns
A Promise
that is resolved (or rejected) when the primary service is found (the argument contains a BluetoothRemoteGATTService
)
Description
See NRF.connect
for usage examples.
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) and ESP32 boards
function BluetoothRemoteGATTServer.getPrimaryServices ⇒
Call type:
function BluetoothRemoteGATTServer.getPrimaryServices()
Returns
A Promise
that is resolved (or rejected) when the primary services are found (the argument contains an array of BluetoothRemoteGATTService
)
function BluetoothRemoteGATTServer.getSecurityStatus ⇒
Call type:
function BluetoothRemoteGATTServer.getSecurityStatus()
Returns
An object
Description
Return an object with information about the security state of the current connection:
{
connected // The connection is active (not disconnected).
encrypted // Communication on this link is encrypted.
mitm_protected // The encrypted communication is also protected against man-in-the-middle attacks.
bonded // The peer is bonded with us
}
See BluetoothRemoteGATTServer.startBonding
for information about negotiating a
secure connection.
This is not part of the Web Bluetooth Specification. It has been added specifically for Puck.js.
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
property BluetoothRemoteGATTServer.handle ⇒
Call type:
property BluetoothRemoteGATTServer.handle
Returns
The handle to this device (if it is currently connected) - the handle is an internal value used by the Bluetooth Stack
function BluetoothRemoteGATTServer.setRSSIHandler ⇒
Call type:
function BluetoothRemoteGATTServer.setRSSIHandler(callback)
Parameters
callback
- The callback to call with the RSSI value, or undefined to stop
Description
Start/stop listening for RSSI values on the active GATT connection
// Start listening for RSSI value updates
gattServer.setRSSIHandler(function(rssi) {
console.log(rssi); // prints -85 (or similar)
});
// Stop listening
gattServer.setRSSIHandler();
RSSI is the 'Received Signal Strength Indication' in dBm
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) and ESP32 boards
function BluetoothRemoteGATTServer.startBonding ⇒
Call type:
function BluetoothRemoteGATTServer.startBonding(forceRePair)
Parameters
forceRePair
- If the device is already bonded, re-pair it
Returns
A Promise
that is resolved (or rejected) when the bonding is complete
Description
Start negotiating bonding (secure communications) with the connected device, and return a Promise that is completed on success or failure.
var gatt;
NRF.requestDevice({ filters: [{ name: 'Puck.js abcd' }] }).then(function(device) {
console.log("found device");
return device.gatt.connect();
}).then(function(g) {
gatt = g;
console.log("connected");
return gatt.startBonding();
}).then(function() {
console.log("bonded", gatt.getSecurityStatus());
gatt.disconnect();
}).catch(function(e) {
console.log("ERROR",e);
});
This is not part of the Web Bluetooth Specification. It has been added specifically for Espruino.
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
BluetoothRemoteGATTService Class
Web Bluetooth-style GATT service - get this using
BluetoothRemoteGATTServer.getPrimaryService(s)
https://webbluetoothcg.github.io/web-bluetooth/#bluetoothremotegattservice
Methods and Fields
- property BluetoothRemoteGATTService.device
- function BluetoothRemoteGATTService.getCharacteristic(characteristic)
- function BluetoothRemoteGATTService.getCharacteristics()
property BluetoothRemoteGATTService.device ⇒
Call type:
property BluetoothRemoteGATTService.device
Returns
The BluetoothDevice
this Service came from
function BluetoothRemoteGATTService.getCharacteristic ⇒
Call type:
function BluetoothRemoteGATTService.getCharacteristic(characteristic)
Parameters
characteristic
- The characteristic UUID
Returns
A Promise
that is resolved (or rejected) when the characteristic is found (the argument contains a BluetoothRemoteGATTCharacteristic
)
Description
See NRF.connect
for usage examples.
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) and ESP32 boards
function BluetoothRemoteGATTService.getCharacteristics ⇒
Call type:
function BluetoothRemoteGATTService.getCharacteristics()
Returns
A Promise
that is resolved (or rejected) when the characteristic is found (the argument contains an array of BluetoothRemoteGATTCharacteristic
)
Boolean Class
Methods and Fields
constructor Boolean ⇒
Call type:
new Boolean(value)
Parameters
value
- A single value to be converted to a number
Returns
A Boolean object
Description
Creates a boolean
CC3000 Library
Methods and Fields
CC3000.connect ⇒
Call type:
require("CC3000").connect(spi, cs, en, irq)
Parameters
spi
- Device to use for SPI (or undefined to use the default). SPI should be 1,000,000 baud, and set to 'mode 1'
cs
- The pin to use for Chip Select
en
- The pin to use for Enable
irq
- The pin to use for Interrupts
Returns
A WLAN Object
Description
Initialise the CC3000 and return a WLAN object
console Class
An Object that contains functions for writing to the interactive console
Methods and Fields
- console.debug(text, ...)
- console.error(text, ...)
- console.info(text, ...)
- console.log(text, ...)
- console.warn(text, ...)
console.debug ⇒
Call type:
console.debug(text, ...)
Parameters
text, ...
- One or more arguments to print
Description
Implemented in Espruino as an alias of console.log
console.error ⇒
Call type:
console.error(text, ...)
Parameters
text, ...
- One or more arguments to print
Description
Implemented in Espruino as an alias of console.log
console.info ⇒
Call type:
console.info(text, ...)
Parameters
text, ...
- One or more arguments to print
Description
Implemented in Espruino as an alias of console.log
console.log ⇒
Call type:
console.log(text, ...)
Parameters
text, ...
- One or more arguments to print
Description
Print the supplied string(s) to the console
Note:* If you're connected to a computer (not a wall adaptor) via USB but *you are not running a terminal app then when you print data Espruino may pause execution and wait until the computer requests the data it is trying to print.
console.warn ⇒
Call type:
console.warn(text, ...)
Parameters
text, ...
- One or more arguments to print
Description
Implemented in Espruino as an alias of console.log
crypto Library
Cryptographic functions
Note: This library is currently only included in builds for boards where
there is space. For other boards there is crypto.js
which implements SHA1 in
JS.
Methods and Fields
- require("crypto").AES
- require("crypto").PBKDF2(passphrase, salt, options)
- require("crypto").SHA1(message)
- require("crypto").SHA224(message)
- require("crypto").SHA256(message)
- require("crypto").SHA384(message)
- require("crypto").SHA512(message)
crypto.AES ⇒
Call type:
require("crypto").AES
Returns
See description above
Description
Class containing AES encryption/decryption
Note: This is only available in devices that support AES (Espruino Pico, Espruino WiFi or Linux)
crypto.PBKDF2 ⇒
Call type:
require("crypto").PBKDF2(passphrase, salt, options)
Parameters
passphrase
- Passphrase
salt
- Salt for turning passphrase into a key
options
- Object of Options, { keySize: 8 (in 32 bit words), iterations: 10, hasher: 'SHA1'/'SHA224'/'SHA256'/'SHA384'/'SHA512' }
Returns
Returns an ArrayBuffer
Description
Password-Based Key Derivation Function 2 algorithm, using SHA512
Note: This is only available in devices with TLS and SSL support (Espruino Pico and Espruino WiFi only)
crypto.SHA1 ⇒
Call type:
require("crypto").SHA1(message)
Parameters
message
- The message to apply the hash to
Returns
Returns a 20 byte ArrayBuffer
Description
Performs a SHA1 hash and returns the result as a 20 byte ArrayBuffer.
Note: On some boards (currently only Espruino Original) there isn't space for a fully unrolled SHA1 implementation so a slower all-JS implementation is used instead.
Note: This is only available in devices that support Crypto Functionality (Espruino Pico, Original, Espruino WiFi, Espruino BLE devices, Linux or ESP8266)
crypto.SHA224 ⇒
Call type:
require("crypto").SHA224(message)
Parameters
message
- The message to apply the hash to
Returns
Returns a 20 byte ArrayBuffer
Description
Performs a SHA224 hash and returns the result as a 28 byte ArrayBuffer
Note: This is only available in devices that support SHA256 (Espruino Pico, Espruino WiFi, Espruino BLE devices or Linux)
crypto.SHA256 ⇒
Call type:
require("crypto").SHA256(message)
Parameters
message
- The message to apply the hash to
Returns
Returns a 20 byte ArrayBuffer
Description
Performs a SHA256 hash and returns the result as a 32 byte ArrayBuffer
Note: This is only available in devices that support SHA256 (Espruino Pico, Espruino WiFi, Espruino BLE devices or Linux)
crypto.SHA384 ⇒
Call type:
require("crypto").SHA384(message)
Parameters
message
- The message to apply the hash to
Returns
Returns a 20 byte ArrayBuffer
Description
Performs a SHA384 hash and returns the result as a 48 byte ArrayBuffer
Note: This is only available in devices that support SHA512 (Espruino Pico, Espruino WiFi, Espruino BLE devices or Linux)
crypto.SHA512 ⇒
Call type:
require("crypto").SHA512(message)
Parameters
message
- The message to apply the hash to
Returns
Returns a 32 byte ArrayBuffer
Description
Performs a SHA512 hash and returns the result as a 64 byte ArrayBuffer
Note: This is only available in devices that support SHA512 (Espruino Pico, Espruino WiFi, Espruino BLE devices or Linux)
DataView Class
This class helps
Methods and Fields
- constructor DataView(buffer, byteOffset, byteLength)
- function DataView.getFloat32(byteOffset, littleEndian)
- function DataView.getFloat64(byteOffset, littleEndian)
- function DataView.getInt16(byteOffset, littleEndian)
- function DataView.getInt32(byteOffset, littleEndian)
- function DataView.getInt8(byteOffset, littleEndian)
- function DataView.getUint16(byteOffset, littleEndian)
- function DataView.getUint32(byteOffset, littleEndian)
- function DataView.getUint8(byteOffset, littleEndian)
- function DataView.setFloat32(byteOffset, value, littleEndian)
- function DataView.setFloat64(byteOffset, value, littleEndian)
- function DataView.setInt16(byteOffset, value, littleEndian)
- function DataView.setInt32(byteOffset, value, littleEndian)
- function DataView.setInt8(byteOffset, value, littleEndian)
- function DataView.setUint16(byteOffset, value, littleEndian)
- function DataView.setUint32(byteOffset, value, littleEndian)
- function DataView.setUint8(byteOffset, value, littleEndian)
constructor DataView ⇒
Call type:
new DataView(buffer, byteOffset, byteLength)
Parameters
buffer
- The ArrayBuffer
to base this on
byteOffset
- [optional] The offset of this view in bytes
byteLength
- [optional] The length in bytes
Returns
A DataView
object
Description
Create a DataView
object that can be used to access the data in an
ArrayBuffer
.
var b = new ArrayBuffer(8)
var v = new DataView(b)
v.setUint16(0,"0x1234")
v.setUint8(3,"0x56")
console.log("0x"+v.getUint32(0).toString(16))
// prints 0x12340056
Note: This is not available in devices with low flash memory
function DataView.getFloat32 ⇒
Call type:
function DataView.getFloat32(byteOffset, littleEndian)
Parameters
byteOffset
- The offset in bytes to read from
littleEndian
- [optional] Whether to read in little endian - if false or undefined data is read as big endian
Returns
the index of the value in the array, or -1
function DataView.getFloat64 ⇒
Call type:
function DataView.getFloat64(byteOffset, littleEndian)
Parameters
byteOffset
- The offset in bytes to read from
littleEndian
- [optional] Whether to read in little endian - if false or undefined data is read as big endian
Returns
the index of the value in the array, or -1
function DataView.getInt16 ⇒
Call type:
function DataView.getInt16(byteOffset, littleEndian)
Parameters
byteOffset
- The offset in bytes to read from
littleEndian
- [optional] Whether to read in little endian - if false or undefined data is read as big endian
Returns
the index of the value in the array, or -1
function DataView.getInt32 ⇒
Call type:
function DataView.getInt32(byteOffset, littleEndian)
Parameters
byteOffset
- The offset in bytes to read from
littleEndian
- [optional] Whether to read in little endian - if false or undefined data is read as big endian
Returns
the index of the value in the array, or -1
function DataView.getInt8 ⇒
Call type:
function DataView.getInt8(byteOffset, littleEndian)
Parameters
byteOffset
- The offset in bytes to read from
littleEndian
- [optional] Whether to read in little endian - if false or undefined data is read as big endian
Returns
the index of the value in the array, or -1
function DataView.getUint16 ⇒
Call type:
function DataView.getUint16(byteOffset, littleEndian)
Parameters
byteOffset
- The offset in bytes to read from
littleEndian
- [optional] Whether to read in little endian - if false or undefined data is read as big endian
Returns
the index of the value in the array, or -1
function DataView.getUint32 ⇒
Call type:
function DataView.getUint32(byteOffset, littleEndian)
Parameters
byteOffset
- The offset in bytes to read from
littleEndian
- [optional] Whether to read in little endian - if false or undefined data is read as big endian
Returns
the index of the value in the array, or -1
function DataView.getUint8 ⇒
Call type:
function DataView.getUint8(byteOffset, littleEndian)
Parameters
byteOffset
- The offset in bytes to read from
littleEndian
- [optional] Whether to read in little endian - if false or undefined data is read as big endian
Returns
the index of the value in the array, or -1
function DataView.setFloat32 ⇒
Call type:
function DataView.setFloat32(byteOffset, value, littleEndian)
Parameters
byteOffset
- The offset in bytes to read from
value
- The value to write
littleEndian
- [optional] Whether to read in little endian - if false or undefined data is read as big endian
function DataView.setFloat64 ⇒
Call type:
function DataView.setFloat64(byteOffset, value, littleEndian)
Parameters
byteOffset
- The offset in bytes to read from
value
- The value to write
littleEndian
- [optional] Whether to read in little endian - if false or undefined data is read as big endian
function DataView.setInt16 ⇒
Call type:
function DataView.setInt16(byteOffset, value, littleEndian)
Parameters
byteOffset
- The offset in bytes to read from
value
- The value to write
littleEndian
- [optional] Whether to read in little endian - if false or undefined data is read as big endian
function DataView.setInt32 ⇒
Call type:
function DataView.setInt32(byteOffset, value, littleEndian)
Parameters
byteOffset
- The offset in bytes to read from
value
- The value to write
littleEndian
- [optional] Whether to read in little endian - if false or undefined data is read as big endian
function DataView.setInt8 ⇒
Call type:
function DataView.setInt8(byteOffset, value, littleEndian)
Parameters
byteOffset
- The offset in bytes to read from
value
- The value to write
littleEndian
- [optional] Whether to read in little endian - if false or undefined data is read as big endian
function DataView.setUint16 ⇒
Call type:
function DataView.setUint16(byteOffset, value, littleEndian)
Parameters
byteOffset
- The offset in bytes to read from
value
- The value to write
littleEndian
- [optional] Whether to read in little endian - if false or undefined data is read as big endian
function DataView.setUint32 ⇒
Call type:
function DataView.setUint32(byteOffset, value, littleEndian)
Parameters
byteOffset
- The offset in bytes to read from
value
- The value to write
littleEndian
- [optional] Whether to read in little endian - if false or undefined data is read as big endian
function DataView.setUint8 ⇒
Call type:
function DataView.setUint8(byteOffset, value, littleEndian)
Parameters
byteOffset
- The offset in bytes to read from
value
- The value to write
littleEndian
- [optional] Whether to read in little endian - if false or undefined data is read as big endian
Date Class
The built-in class for handling Dates.
Note: By default the time zone is GMT+0, however you can change the timezone
using the E.setTimeZone(...)
function.
For example E.setTimeZone(1)
will be GMT+0100
However if you have daylight savings time set with E.setDST(...)
then the
timezone set by E.setTimeZone(...)
will be ignored.
Methods and Fields
- constructor Date(args, ...)
- function Date.getDate()
- function Date.getDay()
- function Date.getFullYear()
- function Date.getHours()
- function Date.getIsDST()
- function Date.getMilliseconds()
- function Date.getMinutes()
- function Date.getMonth()
- function Date.getSeconds()
- function Date.getTime()
- function Date.getTimezoneOffset()
- Date.now()
- Date.parse(str)
- function Date.setDate(dayValue)
- function Date.setFullYear(yearValue, monthValue, dayValue)
- function Date.setHours(hoursValue, minutesValue, secondsValue, millisecondsValue)
- function Date.setMilliseconds(millisecondsValue)
- function Date.setMinutes(minutesValue, secondsValue, millisecondsValue)
- function Date.setMonth(monthValue, dayValue)
- function Date.setSeconds(secondsValue, millisecondsValue)
- function Date.setTime(timeValue)
- function Date.toISOString()
- function Date.toJSON()
- function Date.toLocalISOString()
- function Date.toString()
- function Date.toUTCString()
- function Date.valueOf()
constructor Date ⇒
Call type:
new Date(args, ...)
Parameters
args, ...
- Either nothing (current time), one numeric argument (milliseconds since 1970), a date string (see Date.parse
), or [year, month, day, hour, minute, second, millisecond]
Returns
A Date object
Description
Creates a date object
function Date.getDate ⇒
Call type:
function Date.getDate()
Returns
See description above
Description
Day of the month 1..31
function Date.getDay ⇒
Call type:
function Date.getDay()
Returns
See description above
Description
Day of the week (0=sunday, 1=monday, etc)
function Date.getFullYear ⇒
Call type:
function Date.getFullYear()
Returns
See description above
Description
The year, e.g. 2014
function Date.getHours ⇒
Call type:
function Date.getHours()
Returns
See description above
Description
0..23
function Date.getIsDST ⇒
Call type:
function Date.getIsDST()
Returns
true if daylight savings time is in effect
Description
This returns a boolean indicating whether daylight savings time is in effect.
Note: This is not available in devices with low flash memory
function Date.getMilliseconds ⇒
Call type:
function Date.getMilliseconds()
Returns
See description above
Description
0..999
function Date.getMinutes ⇒
Call type:
function Date.getMinutes()
Returns
See description above
Description
0..59
function Date.getMonth ⇒
Call type:
function Date.getMonth()
Returns
See description above
Description
Month of the year 0..11
function Date.getSeconds ⇒
Call type:
function Date.getSeconds()
Returns
See description above
Description
0..59
function Date.getTime ⇒
Call type:
function Date.getTime()
Returns
See description above
Description
Return the number of milliseconds since 1970
function Date.getTimezoneOffset ⇒
Call type:
function Date.getTimezoneOffset()
Returns
The difference, in minutes, between UTC and local time
Description
This returns the time-zone offset from UTC, in minutes.
Note: This is not available in devices with low flash memory
Date.now ⇒
Call type:
Date.now()
Returns
See description above
Description
Get the number of milliseconds elapsed since 1970 (or on embedded platforms, since startup).
Note: Desktop JS engines return an integer value for Date.now()
, however Espruino
returns a floating point value, accurate to fractions of a millisecond.
Date.parse ⇒
Call type:
Date.parse(str)
Parameters
str
- A String
Returns
The number of milliseconds since 1970
Description
Parse a date string and return milliseconds since 1970. Data can be either '2011-10-20T14:48:00', '2011-10-20' or 'Mon, 25 Dec 1995 13:30:00 +0430'
function Date.setDate ⇒
Call type:
function Date.setDate(dayValue)
Parameters
dayValue
- the day of the month, between 0 and 31
Returns
The number of milliseconds since 1970
Description
Day of the month 1..31
Note: This is not available in devices with low flash memory
function Date.setFullYear ⇒
Call type:
function Date.setFullYear(yearValue, monthValue, dayValue)
Parameters
yearValue
- The full year - eg. 1989
monthValue
- [optional] the month, between 0 and 11
dayValue
- [optional] the day, between 0 and 31
Returns
The number of milliseconds since 1970
function Date.setHours ⇒
Call type:
function Date.setHours(hoursValue, minutesValue, secondsValue, millisecondsValue)
Parameters
hoursValue
- number of hours, 0..23
minutesValue
- number of minutes, 0..59
secondsValue
- [optional] number of seconds, 0..59
millisecondsValue
- [optional] number of milliseconds, 0..999
Returns
The number of milliseconds since 1970
Description
0..23
Note: This is not available in devices with low flash memory
function Date.setMilliseconds ⇒
Call type:
function Date.setMilliseconds(millisecondsValue)
Parameters
millisecondsValue
- number of milliseconds, 0..999
Returns
The number of milliseconds since 1970
function Date.setMinutes ⇒
Call type:
function Date.setMinutes(minutesValue, secondsValue, millisecondsValue)
Parameters
minutesValue
- number of minutes, 0..59
secondsValue
- [optional] number of seconds, 0..59
millisecondsValue
- [optional] number of milliseconds, 0..999
Returns
The number of milliseconds since 1970
Description
0..59
Note: This is not available in devices with low flash memory
function Date.setMonth ⇒
Call type:
function Date.setMonth(monthValue, dayValue)
Parameters
monthValue
- The month, between 0 and 11
dayValue
- [optional] the day, between 0 and 31
Returns
The number of milliseconds since 1970
Description
Month of the year 0..11
Note: This is not available in devices with low flash memory
function Date.setSeconds ⇒
Call type:
function Date.setSeconds(secondsValue, millisecondsValue)
Parameters
secondsValue
- number of seconds, 0..59
millisecondsValue
- [optional] number of milliseconds, 0..999
Returns
The number of milliseconds since 1970
Description
0..59
Note: This is not available in devices with low flash memory
function Date.setTime ⇒
Call type:
function Date.setTime(timeValue)
Parameters
timeValue
- the number of milliseconds since 1970
Returns
the number of milliseconds since 1970
Description
Set the time/date of this Date class
function Date.toISOString ⇒
Call type:
function Date.toISOString()
Returns
A String
Description
Converts to a ISO 8601 String, e.g: 2014-06-20T14:52:20.123Z
Note: This always assumes a timezone of GMT
function Date.toJSON ⇒
Call type:
function Date.toJSON()
Returns
A String
Description
Calls Date.toISOString
to output this date to JSON
function Date.toLocalISOString ⇒
Call type:
function Date.toLocalISOString()
Returns
A String
Description
Converts to a ISO 8601 String (with timezone information), e.g:
2014-06-20T14:52:20.123-0500
Note: This is not available in devices with low flash memory
function Date.toString ⇒
Call type:
function Date.toString()
Returns
A String
Description
Converts to a String, e.g: Fri Jun 20 2014 14:52:20 GMT+0000
Note: This uses whatever timezone was set with E.setTimeZone()
or
E.setDST()
function Date.toUTCString ⇒
Call type:
function Date.toUTCString()
Returns
A String
Description
Converts to a String, e.g: Fri, 20 Jun 2014 14:52:20 GMT
Note: This always assumes a timezone of GMT
function Date.valueOf ⇒
Call type:
function Date.valueOf()
Returns
See description above
Description
Return the number of milliseconds since 1970
dgram Library
This library allows you to create UDP/DATAGRAM servers and clients
In order to use this, you will need an extra module to get network connectivity.
This is designed to be a cut-down version of the node.js library. Please see the Internet page for more information on how to use it.
Methods and Fields
dgram.createSocket ⇒
Call type:
require("dgram").createSocket(type, callback)
Parameters
type
- Socket type to create e.g. 'udp4'. Or options object { type: 'udp4', reuseAddr: true, recvBufferSize: 1024 }
callback
- A function(sckt)
that will be called with the socket when a connection is made. You can then call sckt.send(...)
to send data, and sckt.on('message', function(data) { ... })
and sckt.on('close', function() { ... })
to deal with the response.
Returns
Returns a new dgram.Socket object
Description
Create a UDP socket
dgramSocket Class
An actual socket connection - allowing transmit/receive of TCP data
Methods and Fields
- function dgramSocket.addMembership(group, ip)
- function dgramSocket.bind(port, callback)
- function dgramSocket.close()
- event dgramSocket.close(had_error)
- event dgramSocket.message(msg, rinfo)
- function dgramSocket.send(buffer, offset, length, args, ...)
function dgramSocket.addMembership ⇒
Call type:
function dgramSocket.addMembership(group, ip)
Parameters
group
- A string containing the group ip to join
ip
- A string containing the ip to join with
function dgramSocket.bind ⇒
Call type:
function dgramSocket.bind(port, callback)
Parameters
port
- The port to bind at
callback
- A function(res) that will be called when the socket is bound. You can then call res.on('message', function(message, info) { ... })
and res.on('close', function() { ... })
to deal with the response.
Returns
The dgramSocket instance that 'bind' was called on
function dgramSocket.close ⇒
Call type:
function dgramSocket.close()
Description
Close the socket
event dgramSocket.close ⇒
Call type:
dgramSocket.on('close', function(had_error) { ... });
Parameters
had_error
- A boolean indicating whether the connection had an error (use an error event handler to get error details).
Description
Called when the connection closes.
event dgramSocket.message ⇒
Call type:
dgramSocket.on('message', function(msg, rinfo) { ... });
Parameters
msg
- A string containing the received message
rinfo
- Sender address,port containing information
Description
The 'message' event is called when a datagram message is received. If a handler
is defined with X.on('message', function(msg) { ... })
then it will be called`
function dgramSocket.send ⇒
Call type:
function dgramSocket.send(buffer, offset, length, args, ...)
Parameters
buffer
- A string containing message to send
offset
- Offset in the passed string where the message starts [optional]
length
- Number of bytes in the message [optional]
args, ...
- Destination port number, Destination IP address string
E Class
This is the built-in JavaScript class for Espruino utility functions.
Methods and Fields
- event E.AMS(info)
- event E.ANCS(info)
- E.asm(callspec, assemblycode, ...)
- E.asUTF8(str)
- E.clip(x, min, max)
- E.compiledC(code)
- E.connectSDCard(spi, csPin)
- E.convolve(arr1, arr2, offset)
- E.CRC32(data)
- E.decodeUTF8(str, lookup, replaceFn)
- E.defrag()
- E.dumpFragmentation()
- E.dumpFreeList()
- E.dumpLockedVars()
- E.dumpStr()
- E.dumpTimers()
- E.dumpVariables()
- E.enableWatchdog(timeout, isAuto)
- event E.errorFlag(errorFlags)
- E.FFT(arrReal, arrImage, inverse)
- E.flashFatFS(options)
- E.fromUTF8(str)
- E.getAddressOf(v, flatAddress)
- E.getAnalogVRef()
- E.getBattery()
- E.getConsole()
- E.getErrorFlags()
- E.getFlags()
- E.getRTCPrescaler(calibrate)
- E.getSizeOf(v, depth)
- E.getTemperature()
- E.HSBtoRGB(hue, sat, bri, format)
- E.hwRand()
- event E.init()
- E.isUTF8(str)
- E.kickWatchdog()
- event E.kill()
- E.lockConsole()
- E.lookupNoCase(haystack, needle, returnKey)
- E.mapInPlace(from, to, map, bits)
- E.memoryArea(addr, len)
- E.memoryMap(baseAddress, registers)
- E.nativeCall(addr, sig, data)
- E.openFile(path, mode)
- E.pipe(source, destination, options)
- E.reboot()
- E.reverseByte(x)
- E.sendUSBHID(data)
- E.setBootCode(code, alwaysExec)
- E.setClock(options)
- E.setConsole(device, options)
- E.setDST(params, ...)
- E.setFlags(flags)
- E.setPassword(password)
- E.setRTCPrescaler(prescaler)
- E.setTimeZone(zone)
- E.setUSBHID(opts)
- E.showAlert(message, options)
- E.showMenu(menu)
- E.showMessage(message, options)
- E.showPrompt(message, options)
- E.showScroller(options)
- E.srand(v)
- E.stopEventPropagation()
- E.sum(arr)
- E.toArrayBuffer(str)
- E.toFlatString(args, ...)
- E.toJS(arg)
- E.toString(args, ...)
- event E.touch(x, y, b)
- E.toUint8Array(args, ...)
- E.unmountSD()
- E.variance(arr, mean)
event E.AMS ⇒
Call type:
E.on('AMS', function(info) { ... });
Parameters
info
- An object (see below)
Description
Called when a media event arrives on an Apple iOS device Bangle.js is connected to
{
id : "artist"/"album"/"title"/"duration",
value : "Some text",
truncated : bool // the 'value' was too big to be sent completely
}
Note: This is only available in Bangle.js smartwatches
event E.ANCS ⇒
Call type:
E.on('ANCS', function(info) { ... });
Parameters
info
- An object (see below)
Description
Called when a notification arrives on an Apple iOS device Bangle.js is connected to
{
event:"add",
uid:42,
category:4,
categoryCnt:42,
silent:true,
important:false,
preExisting:true,
positive:false,
negative:true
}
You can then get more information with NRF.ancsGetNotificationInfo
, for instance:
E.on('ANCS', event => {
NRF.ancsGetNotificationInfo( event.uid ).then(a=>print("Notify",E.toJS(a)));
});
Note: This is only available in Bangle.js smartwatches
E.asm ⇒
Call type:
E.asm(callspec, assemblycode, ...)
Parameters
callspec
- The arguments this assembly takes - e.g. void(int)
assemblycode, ...
- One of more strings of assembler code
Description
Provide assembly to Espruino.
This function is not part of Espruino. Instead, it is detected by the
Espruino IDE (or command-line tools) at upload time and is replaced with machine
code and an E.nativeCall
call.
See the documentation on the Assembler for more information.
Note: This is not available in devices with low flash memory
E.asUTF8 ⇒
Call type:
E.asUTF8(str)
Parameters
str
- The string to turn into a UTF8 Unicode String
Returns
A String
Description
By default, strings in Espruino are standard 8 bit binary strings
unless they contain Unicode chars or a \u####
escape code
that doesn't map to the range 0..255.
However calling E.asUTF8 will convert one of those strings to UTF8.
var s = String.fromCharCode(0xF0,0x9F,0x8D,0x94);
var u = E.asUTF8(s);
s.length // 4
s[0] // "\xF0"
u.length // 1
u[0] // hamburger emoji
NOTE: UTF8 is currently only available on Bangle.js devices
Note: This is not available in devices with low flash memory
E.clip ⇒
Call type:
E.clip(x, min, max)
Parameters
x
- A floating point value to clip
min
- The smallest the value should be
max
- The largest the value should be
Returns
The value of x, clipped so as not to be below min or above max.
Description
Clip a number to be between min and max (inclusive)
Note: This is not available in devices with low flash memory
E.compiledC ⇒
Call type:
E.compiledC(code)
Parameters
code
- A Templated string of C code
Description
Provides the ability to write C code inside your JavaScript file.
This function is not part of Espruino. Instead, it is detected by the
Espruino IDE (or command-line tools) at upload time, is sent to our web service
to be compiled, and is replaced with machine code and an E.nativeCall
call.
See the documentation on Inline C for more information and examples.
Note: This is not available in devices with low flash memory
E.connectSDCard ⇒
Call type:
E.connectSDCard(spi, csPin)
Parameters
spi
- The SPI object to use for communication
csPin
- The pin to use for Chip Select
Description
Setup the filesystem so that subsequent calls to E.openFile
and
require('fs').*
will use an SD card on the supplied SPI device and pin.
It can even work using software SPI - for instance:
// DI/CMD = C7
// DO/DAT0 = C8
// CK/CLK = C9
// CD/CS/DAT3 = C6
var spi = new SPI();
spi.setup({mosi:C7, miso:C8, sck:C9});
E.connectSDCard(spi, C6);
console.log(require("fs").readdirSync());
See the page on File IO for more information.
Note: We'd strongly suggest you add a pullup resistor from CD/CS pin to 3.3v. It is good practise to avoid accidental writes before Espruino is initialised, and some cards will not work reliably without one.
Note: If you want to remove an SD card after you have started using it, you
must call E.unmountSD()
or you may cause damage to the card.
Note: This is not available in devices with low flash memory
E.convolve ⇒
Call type:
E.convolve(arr1, arr2, offset)
Parameters
arr1
- An array to convolve
arr2
- An array to convolve
offset
- The mean value of the array
Returns
The variance of the given buffer
Description
Convolve arr1 with arr2. This is equivalent to
v=0;for (i in arr1) v+=arr1[i] *
arr2[(i+offset) % arr2.length]
Note: This is not available in devices with low flash memory
E.CRC32 ⇒
Call type:
E.CRC32(data)
Parameters
data
- Iterable data to perform CRC32 on (each element treated as a byte)
Returns
The CRC of the supplied data
Description
Perform a standard 32 bit CRC (Cyclic redundancy check) on the supplied data (one byte at a time) and return the result as an unsigned integer.
Note: This is not available in devices with low flash memory
E.decodeUTF8 ⇒
Call type:
E.decodeUTF8(str, lookup, replaceFn)
Parameters
str
- A string of UTF8-encoded data
lookup
- An array containing a mapping of character code -> replacement string
replaceFn
- If not in lookup, replaceFn(charCode)
is called and the result used if it's a function, or if it's a string, the string value is used
Returns
A string containing all UTF8 sequences flattened to 8 bits
Description
Decode a UTF8 string.
- Any decoded character less than 256 gets passed straight through
- Otherwise if
lookup
is an array and an item with that char code exists inlookup
then that is used - Otherwise if
lookup
is an object and an item with that char code (as lowercase hex) exists inlookup
then that is used - Otherwise
replaceFn(charCode)
is called and the result used ifreplaceFn
is a function - If
replaceFn
is a string, that is used - Or finally if nothing else matches, the character is ignored
For instance:
let unicodeRemap = {
0x20ac:"\u0080", // Euro symbol
0x2026:"\u0085", // Ellipsis
};
E.decodeUTF8("UTF-8 Euro: \u00e2\u0082\u00ac", unicodeRemap, '[?]') == "UTF-8 Euro: \u0080"
Note: This is not available in devices with low flash memory
E.defrag ⇒
Call type:
E.defrag()
Description
BETA: defragment memory!
Note: This is not available in devices with low flash memory
E.dumpFragmentation ⇒
Call type:
E.dumpFragmentation()
Description
Show fragmentation.
is free space
#
is a normal variableL
is a locked variable (address used, cannot be moved)=
represents data in a Flat String (must be contiguous)
Note: This is not available in devices with low flash memory
E.dumpFreeList ⇒
Call type:
E.dumpFreeList()
Description
Dump any locked variables that aren't referenced from global
- for debugging
memory leaks only.
Note: This is not available in release builds
E.dumpLockedVars ⇒
Call type:
E.dumpLockedVars()
Description
Dump any locked variables that aren't referenced from global
- for debugging
memory leaks only.
Note: This does a linear scan over memory, finding variables
that are currently locked. In some cases it may show variables
like Unknown 66
which happen when part of a string has ended
up placed in memory ahead of the String that it's part of. See https://github.com/espruino/Espruino/issues/2345
Note: This is not available in release builds
E.dumpStr ⇒
Call type:
E.dumpStr()
Returns
A String
Description
Get the current interpreter state in a text form such that it can be copied to a new device
Note: This is not available in devices with low flash memory
E.dumpTimers ⇒
Call type:
E.dumpTimers()
Description
Output the current list of Utility Timer Tasks - for debugging only
Note: This is not available in devices with low flash memory
E.dumpVariables ⇒
Call type:
E.dumpVariables()
Description
Dumps a comma-separated list of all allocated variables along with the variables they link to. Can be used to visualise where memory is used.
Note: This is not available in devices with low flash memory
E.enableWatchdog ⇒
Call type:
E.enableWatchdog(timeout, isAuto)
Parameters
timeout
- The timeout in seconds before a watchdog reset
isAuto
- If undefined or true, the watchdog is kicked automatically. If not, you must call E.kickWatchdog()
yourself
Description
Enable the watchdog timer. This will reset Espruino if it isn't able to return to the idle loop within the timeout.
If isAuto
is false, you must call E.kickWatchdog()
yourself every so often
or the chip will reset.
E.enableWatchdog(0.5); // automatic mode
while(1); // Espruino will reboot because it has not been idle for 0.5 sec
E.enableWatchdog(1, false);
setInterval(function() {
if (everything_ok)
E.kickWatchdog();
}, 500);
// Espruino will now reset if everything_ok is false,
// or if the interval fails to be called
NOTE: This is only implemented on STM32, nRF5x and ESP32 devices (all official Espruino boards).
NOTE:* On STM32 (Pico, WiFi, Original) with setDeepSleep(1)
you need to
explicitly wake Espruino up with an interval of less than the watchdog timeout
or the watchdog will fire and the board will reboot. You can do this with
setInterval("", time_in_milliseconds)
.
*NOTE: On ESP32, the timeout will be rounded to the nearest second.
Note: This is not available in devices with low flash memory
event E.errorFlag ⇒
Call type:
E.on('errorFlag', function(errorFlags) { ... });
Parameters
errorFlags
- An array of new error flags, as would be returned by E.getErrorFlags()
. Error flags that were present before won't be reported.
Description
This event is called when an error is created by Espruino itself (rather than JS
code) which changes the state of the error flags reported by E.getErrorFlags()
This could be low memory, full buffers, UART overflow, etc. E.getErrorFlags()
has a full description of each type of error.
This event will only be emitted when error flag is set. If the error flag was
already set nothing will be emitted. To clear error flags so that you do get a
callback each time a flag is set, call E.getErrorFlags()
.
E.FFT ⇒
Call type:
E.FFT(arrReal, arrImage, inverse)
Parameters
arrReal
- An array of real values
arrImage
- An array of imaginary values (or if undefined, all values will be taken to be 0)
inverse
- Set this to true if you want an inverse FFT - otherwise leave as 0
Description
Performs a Fast Fourier Transform (FFT) in 32 bit floats on the supplied data
and writes it back into the original arrays. Note that if only one array is
supplied, the data written back is the modulus of the complex result
sqrt(r*r+i*i)
.
In order to perform the FFT, there has to be enough room on the stack to allocate two arrays of 32 bit floating point numbers - this will limit the maximum size of FFT possible to around 1024 items on most platforms.
Note: on the Original Espruino board, FFTs are performed in 64bit arithmetic as there isn't space to include the 32 bit maths routines (2x more RAM is required).
Note: This is not available in devices with low flash memory
E.flashFatFS ⇒
Call type:
E.flashFatFS(options)
Parameters
options
- [optional] An object { addr : int=0x300000, sectors : int=256, format : bool=false }
addr : start address in flash
sectors: number of sectors to use
format: Format the media
Returns
True on success, or false on failure
Description
Change the parameters used for the flash filesystem. The default address is the last 1Mb of 4Mb Flash, 0x300000, with total size of 1Mb.
Before first use the media needs to be formatted.
fs=require("fs");
try {
fs.readdirSync();
} catch (e) { //'Uncaught Error: Unable to mount media : NO_FILESYSTEM'
console.log('Formatting FS - only need to do once');
E.flashFatFS({ format: true });
}
fs.writeFileSync("bang.txt", "This is the way the world ends\nnot with a bang but a whimper.\n");
fs.readdirSync();
This will create a drive of 100 * 4096 bytes at 0x300000. Be careful with the selection of flash addresses as you can overwrite firmware! You only need to format once, as each will erase the content.
E.flashFatFS({ addr:0x300000,sectors:100,format:true });
Note: This is only available in devices with filesystem in Flash support enabled (ESP32 only)
E.fromUTF8 ⇒
Call type:
E.fromUTF8(str)
Parameters
str
- The string to check
Returns
A String
Description
Given a UTF8 String (see E.asUTF8
) this returns the underlying representation
of that String.
E.fromUTF8("\u03C0") == "\xCF\x80"
NOTE: UTF8 is currently only available on Bangle.js devices
Note: This is not available in devices with low flash memory
E.getAddressOf ⇒
Call type:
E.getAddressOf(v, flatAddress)
Parameters
v
- A variable to get the address of
flatAddress
- (boolean) If true
and a Flat String or Flat ArrayBuffer is supplied, return the address of the data inside it - otherwise 0. If false
(the default) return the address of the JsVar itself.
Returns
The address of the given variable
Description
Return the address in memory of the given variable. This can then be used with
peek
and poke
functions. However, changing data in JS variables directly
(flatAddress=false) will most likely result in a crash.
This functions exists to allow embedded targets to set up peripherals such as DMA so that they write directly to JS variables.
See http://www.espruino.com/Internals for more information
Note: This is not available in devices with low flash memory
E.getAnalogVRef ⇒
Call type:
E.getAnalogVRef()
Returns
The voltage (in Volts) that a reading of 1 from analogRead
actually represents - usually around 3.3v
Description
Check the internal voltage reference. To work out an actual voltage of an input
pin, you can use analogRead(pin)*E.getAnalogVRef()
Note: This value is calculated by reading the voltage on an internal voltage reference with the ADC. It will be slightly noisy, so if you need this for accurate measurements we'd recommend that you call this function several times and average the results.
While this is implemented on Espruino boards, it may not be implemented on other devices. If so it'll return NaN.
Note: This is not available in devices with low flash memory
E.getBattery ⇒
Call type:
E.getBattery()
Returns
A percentage between 0 and 100
Description
In devices that come with batteries, this function returns the battery charge percentage as an integer between 0 and 100.
Note: this is an estimation only, based on battery voltage. The temperature
of the battery (as well as the load being drawn from it at the time
E.getBattery
is called) will affect the readings.
Note: This is only available in Puck.js devices and Pixl.js boards and Bangle.js smartwatches
E.getConsole ⇒
Call type:
E.getConsole()
Returns
The current console device as a string, or just null
if the console is null
Description
Returns the current console device - see E.setConsole
for more information.
E.getErrorFlags ⇒
Call type:
E.getErrorFlags()
Returns
An array of error flags
Description
Get and reset the error flags. Returns an array that can contain:
'FIFO_FULL'
: The receive FIFO filled up and data was lost. This could be state
transitions for setWatch, or received characters.
'BUFFER_FULL'
: A buffer for a stream filled up and characters were lost. This
can happen to any stream - Serial,HTTP,etc.
'CALLBACK'
: A callback (setWatch
, setInterval
, on('data',...)
) caused an
error and so was removed.
'LOW_MEMORY'
: Memory is running low - Espruino had to run a garbage collection
pass or remove some of the command history
'MEMORY'
: Espruino ran out of memory and was unable to allocate some data that
it needed.
'UART_OVERFLOW'
: A UART received data but it was not read in time and was
lost
Note: This is not available in devices with low flash memory
E.getFlags ⇒
Call type:
E.getFlags()
Returns
An object containing flag names and their values
Description
Get Espruino's interpreter flags that control the way it handles your JavaScript code.
deepSleep
- Allow deep sleep modes (also set by setDeepSleep)pretokenise
- When adding functions, pre-minify them and tokenise reserved wordsunsafeFlash
- Some platforms stop writes/erases to interpreter memory to stop you bricking the device accidentally - this removes that protectionunsyncFiles
- When writing files, don't flush all data to the SD card after each command (the default is to flush). This is much faster, but can cause filesystem damage if power is lost without the filesystem unmounted.
E.getRTCPrescaler ⇒
Call type:
E.getRTCPrescaler(calibrate)
Parameters
calibrate
- If false
, the current value. If true
, the calculated 'correct' value
Returns
The RTC prescaler's current value
Description
Gets the RTC's current prescaler value if calibrate
is undefined or false.
If calibrate
is true, the low speed oscillator's speed is calibrated against
the high speed oscillator (usually +/- 20 ppm) and a suggested value to be fed
into E.setRTCPrescaler(...)
is returned.
See E.setRTCPrescaler
for more information.
Note: This is only available in Espruino Pico boards and Espruino WiFi boards and 'Original' Espruino boards
E.getSizeOf ⇒
Call type:
E.getSizeOf(v, depth)
Parameters
v
- A variable to get the size of
depth
- The depth that detail should be provided for. If depth<=0 or undefined, a single integer will be returned
Returns
Information about the variable size - see below
Description
Return the number of variable blocks used by the supplied variable. This is useful if you're running out of memory and you want to be able to see what is taking up most of the available space.
If depth>0
and the variable can be recursed into, an array listing all
property names (including internal Espruino names) and their sizes is returned.
If depth>1
there is also a more
field that inspects the objects' children's
children.
For instance E.getSizeOf(function(a,b) { })
returns 5
.
But E.getSizeOf(function(a,b) { }, 1)
returns:
[
{
"name": "a",
"size": 1 },
{
"name": "b",
"size": 1 },
{
"name": "\xFFcod",
"size": 2 }
]
In this case setting depth to 2
will make no difference as there are no more
children to traverse.
See http://www.espruino.com/Internals for more information
Note: This is not available in devices with low flash memory
E.getTemperature ⇒
Call type:
E.getTemperature()
Returns
The temperature in degrees C
Description
Use the microcontroller's internal thermistor to work out the temperature.
On Puck.js v2.0 this will use the on-board PCT2075TP temperature sensor, but on other devices it may not be desperately well calibrated.
While this is implemented on Espruino boards, it may not be implemented on other devices. If so it'll return NaN.
Note:* This is not entirely accurate and varies by a few degrees from chip
to chip. It measures the *die temperature, so when connected to USB it could
be reading 10 over degrees C above ambient temperature. When running from
battery with setDeepSleep(true)
it is much more accurate though.
E.HSBtoRGB ⇒
Call type:
E.HSBtoRGB(hue, sat, bri, format)
Parameters
hue
- The hue, as a value between 0 and 1
sat
- The saturation, as a value between 0 and 1
bri
- The brightness, as a value between 0 and 1
format
- If true
or 1
, return an array of [R,G,B] values betwen 0 and 255. If 16
, return a 16 bit number. undefined
/24
is the same as normal (returning a 24 bit number)
Returns
A 24 bit number containing bytes representing red, green, and blue 0xBBGGRR
. Or if asArray
is true, an array [R,G,B]
Description
Convert hue, saturation and brightness to red, green and blue (packed into an
integer if asArray==false
or an array if asArray==true
).
This replaces Graphics.setColorHSB
and Graphics.setBgColorHSB
. On devices
with 24 bit colour it can be used as: Graphics.setColor(E.HSBtoRGB(h, s, b))
,
or on devices with 26 bit colour use Graphics.setColor(E.HSBtoRGB(h, s, b, 16))
You can quickly set RGB items in an Array or Typed Array using
array.set(E.HSBtoRGB(h, s, b, true), offset)
, which can be useful with arrays
used with require("neopixel").write
.
Note: This is not available in devices with low flash memory
E.hwRand ⇒
Call type:
E.hwRand()
Returns
A random number
Description
Unlike 'Math.random()' which uses a pseudo-random number generator, this method reads from the internal voltage reference several times, XOR-ing and rotating to try and make a relatively random value from the noise in the signal.
Note: This is not available in devices with low flash memory
event E.init ⇒
Call type:
E.on('init', function() { ... });
Description
This event is called right after the board starts up, and has a similar effect
to creating a function called onInit
.
For example to write "Hello World"
every time Espruino starts, use:
E.on('init', function() {
console.log("Hello World!");
});
Note:* that subsequent calls to E.on('init',
will *add a new handler,
rather than replacing the last one. This allows you to write modular code -
something that was not possible with onInit
.
E.isUTF8 ⇒
Call type:
E.isUTF8(str)
Parameters
str
- The string to check
Returns
True if the given String is treated as UTF8 by Espruino
Description
By default, strings in Espruino are standard 8 bit binary strings
unless they contain Unicode chars or a \u####
escape code
that doesn't map to the range 0..255.
This checks if a String is being treated by Espruino as a UTF8 String
See E.asUTF8
to convert to a UTF8 String
NOTE: UTF8 is currently only available on Bangle.js devices
Note: This is not available in devices with low flash memory
E.kickWatchdog ⇒
Call type:
E.kickWatchdog()
Description
Kicks a Watchdog timer set up with E.enableWatchdog(..., false)
. See
E.enableWatchdog
for more information.
NOTE: This is only implemented on STM32 and nRF5x devices (all official Espruino boards).
Note: This is not available in devices with low flash memory
event E.kill ⇒
Call type:
E.on('kill', function() { ... });
Description
This event is called just before the device shuts down for commands such as
reset()
, load()
, save()
, E.reboot()
or Bangle.off()
For example to write "Bye!"
just before shutting down use:
E.on('kill', function() {
console.log("Bye!");
});
NOTE: This event is not called when the device is 'hard reset' - for example by removing power, hitting an actual reset button, or via a Watchdog timer reset.
E.lockConsole ⇒
Call type:
E.lockConsole()
Description
If a password has been set with E.setPassword()
, this will lock the console so
the password needs to be entered to unlock it.
E.lookupNoCase ⇒
Call type:
E.lookupNoCase(haystack, needle, returnKey)
Parameters
haystack
- The Array/Object/Function to search
needle
- The key to search for
returnKey
- If true, return the key, else return the value itself
Returns
The value in the Object matching 'needle', or if returnKey==true
the key's name - or undefined
Description
Search in an Object, Array, or Function
E.mapInPlace ⇒
Call type:
E.mapInPlace(from, to, map, bits)
Parameters
from
- An ArrayBuffer to read elements from
to
- An ArrayBuffer to write elements too
map
- An array or function(value,index)
to use to map one element to another, or undefined
to provide no mapping
bits
- If specified, the number of bits per element (MSB first) - otherwise use a 1:1 mapping. If negative, use LSB first.
Description
Take each element of the from
array, look it up in map
(or call
map(value,index)
if it is a function), and write it into the corresponding
element in the to
array.
You can use an array to map:
var a = new Uint8Array([1,2,3,1,2,3]);
var lut = new Uint8Array([128,129,130,131]);
E.mapInPlace(a, a, lut);
// a = [129, 130, 131, 129, 130, 131]
Or undefined
to pass straight through, or a function to do a normal 'mapping':
var a = new Uint8Array([0x12,0x34,0x56,0x78]);
var b = new Uint8Array(8);
E.mapInPlace(a, b, undefined); // straight through
// b = [0x12,0x34,0x56,0x78,0,0,0,0]
E.mapInPlace(a, b, (value,index)=>index); // write the index in the first 4 (because a.length==4)
// b = [0,1,2,3,4,0,0,0]
E.mapInPlace(a, b, undefined, 4); // 4 bits from 8 bit input -> 2x as many outputs, msb-first
// b = [1, 2, 3, 4, 5, 6, 7, 8]
E.mapInPlace(a, b, undefined, -4); // 4 bits from 8 bit input -> 2x as many outputs, lsb-first
// b = [2, 1, 4, 3, 6, 5, 8, 7]
E.mapInPlace(a, b, a=>a+2, 4);
// b = [3, 4, 5, 6, 7, 8, 9, 10]
var b = new Uint16Array(4);
E.mapInPlace(a, b, undefined, 12); // 12 bits from 8 bit input, msb-first
// b = [0x123, 0x456, 0x780, 0]
E.mapInPlace(a, b, undefined, -12); // 12 bits from 8 bit input, lsb-first
// b = [0x412, 0x563, 0x078, 0]
Note: This is not available in devices with low flash memory
E.memoryArea ⇒
Call type:
E.memoryArea(addr, len)
Parameters
addr
- The address of the memory area
len
- The length (in bytes) of the memory area
Returns
A String
Description
This creates and returns a special type of string, which references a
specific address in memory. It can be used in order to use sections of
Flash memory directly in Espruino (for example Storage
uses it
to allow files to be read directly from Flash).
Note: As of 2v21, Calling E.memoryArea
with an address of 0 will return undefined
E.memoryMap ⇒
Call type:
E.memoryMap(baseAddress, registers)
Parameters
baseAddress
- The base address (added to every address in registers
)
registers
- An object containing {name:address}
Returns
An object where each field is memory-mapped to a register.
Description
Create an object where every field accesses a specific 32 bit address in the microcontroller's memory. This is perfect for accessing on-chip peripherals.
// for NRF52 based chips
var GPIO = E.memoryMap(0x50000000,{OUT:0x504, OUTSET:0x508, OUTCLR:0x50C, IN:0x510, DIR:0x514, DIRSET:0x518, DIRCLR:0x51C});
GPIO.DIRSET = 1; // set GPIO0 to output
GPIO.OUT ^= 1; // toggle the output state of GPIO0
Note: This is not available in devices with low flash memory
E.nativeCall ⇒
Call type:
E.nativeCall(addr, sig, data)
Parameters
addr
- The address in memory of the function (or offset in data
if it was supplied
sig
- The signature of the call, returnType (arg1,arg2,...)
. Allowed types are void
,bool
,int
,double
,float
,Pin
,JsVar
data
- (Optional) A string containing the function itself. If not supplied then 'addr' is used as an absolute address.
Returns
The native function
Description
ADVANCED: It's very easy to crash Espruino using this function if you get the code/arguments you supply wrong!
Create a native function that executes the code at the given address, e.g.
E.nativeCall(0x08012345,'double (double,double)')(1.1, 2.2)
If you're executing a thumb function, you'll almost certainly need to set the bottom bit of the address to 1.
Note it's not guaranteed that the call signature you provide can be used - there are limits on the number of arguments allowed (5).
When supplying data
, if it is a 'flat string' then it will be used directly,
otherwise it'll be converted to a flat string and used.
The argument types in sig
are:
void
- returns nothingbool
- boolean valueint
- 32 bit integerdouble
- 64 bit floating pointfloat
- 32 bit floating point (2v21 and later)Pin
- Espruino 'pin' value (8 bit integer)JsVar
- Pointer to an Espruino JsVar structure
Note: This is not available in devices with low flash memory
E.openFile ⇒
Call type:
E.openFile(path, mode)
Parameters
path
- the path to the file to open.
mode
- The mode to use when opening the file. Valid values for mode are 'r' for read, 'w' for write new, 'w+' for write existing, and 'a' for append. If not specified, the default is 'r'.
Returns
A File object
Description
Open a file
E.pipe ⇒
Call type:
E.pipe(source, destination, options)
Parameters
source
- The source file/stream that will send content. As of 2v19 this can also be a String
destination
- The destination file/stream that will receive content from the source.
options
- [optional] An object { chunkSize : int=64, end : bool=true, complete : function }
chunkSize : The amount of data to pipe from source to destination at a time
complete : a function to call when the pipe activity is complete
end : call the 'end' function on the destination when the source is finished
Description
Pipe one stream to another.
This can be given any object with a read
method as a source, and any object with a .write(data)
method as a destination.
Data will be piped from source
to destination
in the idle loop until source.read(...)
returns undefined
.
For instance:
``` // Print a really big string to the console, 1 character at a time and write 'Finished!' at the end E.pipe("This is a really big String", {write: print}, {chunkSize:1, complete:()=>print("Finished!")});
// Pipe the numbers 1 to 100 to a StorageFile in Storage E.pipe({ n:0, read : function() { if (this.n<100) return (this.n++)+"\n"; }}, require("Storage").open("testfile","w"));
// Pipe a StorageFile straight to the Bluetooth UART E.pipe(require("Storage").open("testfile","r"), Bluetooth);
// Pipe a normal file in Storage (not StorageFile) straight to the Bluetooth UART E.pipe(require("Storage").read("blob.txt"), Bluetooth);
// Pipe a normal file in Storage as a response to an HTTP request function onPageRequest(req, res) { res.writeHead(200, {'Content-Type': 'text/plain'}); E.pipe(require("Storage").read("webpage.txt"), res); } require("http").createServer(onPageRequest).listen(80); ```
Note: This is not available in devices with low flash memory
E.reboot ⇒
Call type:
E.reboot()
Description
Forces a hard reboot of the microcontroller - as close as possible to if the reset pin had been toggled.
Note: This is different to reset()
, which performs a software reset of
Espruino (resetting the interpreter and pin states, but not all the hardware)
E.reverseByte ⇒
Call type:
E.reverseByte(x)
Parameters
x
- A byte value to reverse the bits of
Returns
The byte with reversed bits
Description
Reverse the 8 bits in a byte, swapping MSB and LSB.
For example, E.reverseByte(0b10010000) == 0b00001001
.
Note that you can reverse all the bytes in an array with:
arr =
arr.map(E.reverseByte)
Note: This is not available in devices with low flash memory
E.sendUSBHID ⇒
Call type:
E.sendUSBHID(data)
Parameters
data
- An array of bytes to send as a USB HID packet
Returns
1 on success, 0 on failure
E.setBootCode ⇒
Call type:
E.setBootCode(code, alwaysExec)
Parameters
code
- The code to execute (as a string)
alwaysExec
- Whether to always execute the code (even after a reset)
Description
This writes JavaScript code into Espruino's flash memory, to be executed on
startup. It differs from save()
in that save()
saves the whole state of the
interpreter, whereas this just saves JS code that is executed at boot.
Code will be executed before onInit()
and E.on('init', ...)
.
If alwaysExec
is true
, the code will be executed even after a call to
reset()
. This is useful if you're making something that you want to program,
but you want some code that is always built in (for instance setting up a
display or keyboard).
To remove boot code that has been saved previously, use E.setBootCode("")
Note: this removes any code that was previously saved with save()
E.setClock ⇒
Call type:
E.setClock(options)
Parameters
options
- Platform-specific options for setting clock speed
Returns
The actual frequency the clock has been set to
Description
This sets the clock frequency of Espruino's processor. It will return 0
if it
is unimplemented or the clock speed cannot be changed.
Note: On pretty much all boards, UART, SPI, I2C, PWM, etc will change frequency and will need setting up again in order to work.
STM32F4
Options is of the form { M: int, N: int, P: int, Q: int }
- see the 'Clocks'
section of the microcontroller's reference manual for what these mean.
- System clock = 8Mhz * N / ( M * P )
- USB clock (should be 48Mhz) = 8Mhz * N / ( M * Q )
Optional arguments are:
latency
- flash latency from 0..15PCLK1
- Peripheral clock 1 divisor (default: 2)PCLK2
- Peripheral clock 2 divisor (default: 4)
The Pico's default is {M:8, N:336, P:4, Q:7, PCLK1:2, PCLK2:4}
, use
{M:8,
N:336, P:8, Q:7, PCLK:1, PCLK2:2}
to halve the system clock speed while keeping
the peripherals running at the same speed (omitting PCLK1/2 will lead to the
peripherals changing speed too).
On STM32F4 boards (e.g. Espruino Pico), the USB clock needs to be kept at 48Mhz or USB will fail to work. You'll also experience USB instability if the processor clock falls much below 48Mhz.
ESP8266
Just specify an integer value, either 80 or 160 (for 80 or 160Mhz)
Note: This is not available in devices with low flash memory
E.setConsole ⇒
Call type:
E.setConsole(device, options)
Parameters
device
-
options
- [optional] object of options, see below
Description
Changes the device that the JS console (otherwise known as the REPL) is attached to. If the console is on a device, that device can be used for programming Espruino.
Rather than calling Serial.setConsole
you can call
E.setConsole("DeviceName")
.
This is particularly useful if you just want to remove the console.
E.setConsole(null)
will make the console completely inaccessible.
device
may be "Serial1"
,"USB"
,"Bluetooth"
,"Telnet"
,"Terminal"
, any
other hardware Serial
device, or null
to disable the console completely.
options
is of the form:
{
force : bool // default false, force the console onto this device so it does not move
// if false, changes in connection state (e.g. USB/Bluetooth) can move
// the console automatically.
}
Note: This is not available in devices with low flash memory
E.setDST ⇒
Call type:
E.setDST(params, ...)
Parameters
params, ...
- An array containing the settings for DST, or undefined
to disable
Description
Set the daylight savings time parameters to be used with Date
objects.
The parameters are - dstOffset: The number of minutes daylight savings time adds to the clock (usually 60) - set to 0 to disable DST - timezone: The time zone, in minutes, when DST is not in effect - positive east of Greenwich - startDowNumber: The index of the day-of-week in the month when DST starts - 0 for first, 1 for second, 2 for third, 3 for fourth and 4 for last - startDow: The day-of-week for the DST start calculation - 0 for Sunday, 6 for Saturday - startMonth: The number of the month that DST starts - 0 for January, 11 for December - startDayOffset: The number of days between the selected day-of-week and the actual day that DST starts - usually 0 - startTimeOfDay: The number of minutes elapsed in the day before DST starts - endDowNumber: The index of the day-of-week in the month when DST ends - 0 for first, 1 for second, 2 for third, 3 for fourth and 4 for last - endDow: The day-of-week for the DST end calculation - 0 for Sunday, 6 for Saturday - endMonth: The number of the month that DST ends - 0 for January, 11 for December - endDayOffset: The number of days between the selected day-of-week and the actual day that DST ends - usually 0 - endTimeOfDay: The number of minutes elapsed in the day before DST ends
To determine what the dowNumber, dow, month, dayOffset, timeOfDay
parameters
should be, start with a sentence of the form "DST starts on the last Sunday of
March (plus 0 days) at 03:00". Since it's the last Sunday, we have
startDowNumber = 4, and since it's Sunday, we have startDow = 0. That it is
March gives us startMonth = 2, and that the offset is zero days, we have
startDayOffset = 0. The time that DST starts gives us startTimeOfDay = 3*60.
"DST ends on the Friday before the second Sunday in November at 02:00" would give us endDowNumber=1, endDow=0, endMonth=10, endDayOffset=-2 and endTimeOfDay=120.
Using Ukraine as an example, we have a time which is 2 hours ahead of GMT in
winter (EET) and 3 hours in summer (EEST). DST starts at 03:00 EET on the last
Sunday in March, and ends at 04:00 EEST on the last Sunday in October. So
someone in Ukraine might call E.setDST(60,120,4,0,2,0,180,4,0,9,0,240);
Examples:
// United Kingdom
E.setDST(60,0,4,0,2,0,60,4,0,9,0,120);
// California, USA
E.setDST(60,-480,1,0,2,0,120,0,0,10,0,120);
// Or adjust -480 (-8 hours) for other US states
// Ukraine
E.setDST(60,120,4,0,2,0,180,4,0,9,0,240);
Note: This is not compatible with E.setTimeZone()
. Calling E.setTimeZone()
after this will disable DST.
Note: This is not available in ESPRNODAYLIGHT_SAVING
E.setFlags ⇒
Call type:
E.setFlags(flags)
Parameters
flags
- An object containing flag names and boolean values. You need only specify the flags that you want to change.
Description
Set the Espruino interpreter flags that control the way it handles your JavaScript code.
Run E.getFlags()
and check its description for a list of available flags and
their values.
E.setPassword ⇒
Call type:
E.setPassword(password)
Parameters
password
- The password - max 20 chars
Description
Set a password on the console (REPL). When powered on, Espruino will then demand
a password before the console can be used. If you want to lock the console
immediately after this you can call E.lockConsole()
To remove the password, call this function with no arguments.
Note: There is no protection against multiple password attempts, so someone could conceivably try every password in a dictionary.
Note: This password is stored in memory in plain text. If someone is able to
execute arbitrary JavaScript code on the device (e.g., you use eval
on input
from unknown sources) or read the device's firmware then they may be able to
obtain it.
E.setRTCPrescaler ⇒
Call type:
E.setRTCPrescaler(prescaler)
Parameters
prescaler
- The amount of counts for one second of the RTC - this is a 15 bit integer value (0..32767)
Description
Sets the RTC's prescaler's maximum value. This is the counter that counts up on each oscillation of the low speed oscillator. When the prescaler counts to the value supplied, one second is deemed to have passed.
By default this is set to the oscillator's average speed as specified in the datasheet, and usually that is fine. However on early Espruino Pico boards the STM32F4's internal oscillator could vary by as much as 15% from the value in the datasheet. In that case you may want to alter this value to reflect the true RTC speed for more accurate timekeeping.
To change the RTC's prescaler value to a computed value based on comparing against the high speed oscillator, just run the following command, making sure it's done a few seconds after the board starts up:
E.setRTCPrescaler(E.getRTCPrescaler(true));
When changing the RTC prescaler, the RTC 'follower' counters are reset and it can take a second or two before readings from getTime are stable again.
To test, you can connect an input pin to a known frequency square wave and then
use setWatch
. If you don't have a frequency source handy, you can check
against the high speed oscillator:
// connect pin B3 to B4
analogWrite(B3, 0.5, {freq:0.5});
setWatch(function(e) {
print(e.time - e.lastTime);
}, B4, {repeat:true});
Note: This is only used on official Espruino boards containing an STM32 microcontroller. Other boards (even those using an STM32) don't use the RTC and so this has no effect.
Note: This is only available in Espruino Pico boards and Espruino WiFi boards and 'Original' Espruino boards
E.setTimeZone ⇒
Call type:
E.setTimeZone(zone)
Parameters
zone
- The time zone in hours
Description
Set the time zone to be used with Date
objects.
For example E.setTimeZone(1)
will be GMT+0100
Time can be set with setTime
.
Note: If daylight savings time rules have been set with E.setDST()
,
calling E.setTimeZone()
will remove them and move back to using a static
timezone that doesn't change based on the time of year.
E.setUSBHID ⇒
Call type:
E.setUSBHID(opts)
Parameters
opts
- An object containing at least reportDescriptor, an array representing the report descriptor. Pass undefined to disable HID.
Description
USB HID will only take effect next time you unplug and re-plug your Espruino. If
you're disconnecting it from power you'll have to make sure you have save()
d
after calling this function.
Note: This is only available in devices that support USB HID (Espruino Pico and Espruino WiFi)
E.showAlert ⇒
Call type:
E.showAlert(message, options)
Parameters
message
- A message to display. Can include newlines
options
- [optional] a title for the message or an object containing options
Returns
A promise that is resolved when 'Ok' is pressed
Description
Displays a full screen prompt on the screen, with a single 'Ok' button.
When the button is pressed the promise is resolved.
E.showAlert("Hello").then(function() {
print("Ok pressed");
});
// or
E.showAlert("These are\nLots of\nLines","My Title").then(function() {
print("Ok pressed");
});
To remove the window, call E.showAlert()
with no arguments.
Note: This is only available in Bangle.js smartwatches
E.showMenu ⇒
Call type:
E.showMenu(menu)
Parameters
menu
- An object containing name->function mappings to to be used in a menu
Returns
A menu object with draw
, move
and select
functions
Description
Display a menu on the screen, and set up the buttons to navigate through it.
Supply an object containing menu items. When an item is selected, the function it references will be executed. For example:
var boolean = false;
var number = 50;
// First menu
var mainmenu = {
"" : { title : "-- Main Menu --" }, // options
"LED On" : function() { LED1.set(); },
"LED Off" : function() { LED1.reset(); },
"Submenu" : function() { E.showMenu(submenu); },
"A Boolean" : {
value : boolean,
format : v => v?"On":"Off",
onchange : v => { boolean=v; }
},
"A Number" : {
value : number,
min:0,max:100,step:10,
onchange : v => { number=v; }
},
"Exit" : function() { E.showMenu(); }, // remove the menu
};
// Submenu
var submenu = {
"" : { title : "-- SubMenu --",
back : function() { E.showMenu(mainmenu); } },
"One" : undefined, // do nothing
"Two" : undefined // do nothing
};
// Actually display the menu
E.showMenu(mainmenu);
The menu will stay onscreen and active until explicitly removed, which you can
do by calling E.showMenu()
without arguments.
See http://www.espruino.com/graphical_menu for more detailed information.
On Bangle.js there are a few additions over the standard graphical_menu
:
- The options object can contain:
back : function() { }
- add a 'back' button, with the function called when it is pressedremove : function() { }
- add a handler function to be called when the menu is removed- (Bangle.js 2)
scroll : int
- an integer specifying how much the initial menu should be scrolled by
- The object returned by
E.showMenu
contains:- (Bangle.js 2)
scroller
- the object returned byE.showScroller
-scroller.scroll
returns the amount the menu is currently scrolled by
- (Bangle.js 2)
- In the object specified for editable numbers:
- (Bangle.js 2) the
format
function is called withformat(value)
in the main menu,format(value,1)
when in a scrollable list, orformat(value,2)
when in a popup window.
- (Bangle.js 2) the
You can also specify menu items as an array (rather than an Object). This can be
useful if you have menu items with the same title, or you want to push
menu
items onto an array:
var menu = [
{ title:"Something", onchange:function() { print("selected"); } },
{ title:"On or Off", value:false, onchange: v => print(v) },
{ title:"A Value", value:3, min:0, max:10, onchange: v => print(v) },
];
menu[""] = { title:"Hello" };
E.showMenu(menu);
Note: This is only available in Bangle.js smartwatches
Note: This is only available in Bangle.js smartwatches with DICKENS
E.showMessage ⇒
Call type:
E.showMessage(message, options)
Parameters
message
- A message to display. Can include newlines
options
- [optional] a title for the message, or an object of options {title:string, img:image_string}
Description
A utility function for displaying a full screen message on the screen.
Draws to the screen and returns immediately.
E.showMessage("These are\nLots of\nLines","My Title")
or to display an image as well as text:
E.showMessage("Lots of text will wrap automatically",{
title:"Warning",
img:atob("FBQBAfgAf+Af/4P//D+fx/n+f5/v+f//n//5//+f//n////3//5/n+P//D//wf/4B/4AH4A=")
})
Note: This is only available in Bangle.js smartwatches
Note: This is only available in Bangle.js smartwatches with DICKENS
E.showPrompt ⇒
Call type:
E.showPrompt(message, options)
Parameters
message
- A message to display. Can include newlines
options
- [optional] an object of options (see below)
Returns
A promise that is resolved when 'Ok' is pressed
Description
Displays a full screen prompt on the screen, with the buttons requested (or
Yes
and No
for defaults).
When the button is pressed the promise is resolved with the requested values
(for the Yes
and No
defaults, true
and false
are returned).
E.showPrompt("Do you like fish?").then(function(v) {
if (v) print("'Yes' chosen");
else print("'No' chosen");
});
// Or
E.showPrompt("How many fish\ndo you like?",{
title:"Fish",
buttons : {"One":1,"Two":2,"Three":3}
}).then(function(v) {
print("You like "+v+" fish");
});
// Or
E.showPrompt("Continue?", {
title:"Alert",
img:atob("FBQBAfgAf+Af/4P//D+fx/n+f5/v+f//n//5//+f//n////3//5/n+P//D//wf/4B/4AH4A=")}).then(function(v) {
if (v) print("'Yes' chosen");
else print("'No' chosen");
});
To remove the prompt, call E.showPrompt()
with no arguments.
The second options
argument can contain:
{
title: "Hello", // optional Title
buttons : {"Ok":true,"Cancel":false}, // optional list of button text & return value
img: "image_string" // optional image string to draw
remove: function() { } // Bangle.js: optional function to be called when the prompt is removed
}
Note: This is only available in Bangle.js smartwatches
Note: This is only available in Bangle.js smartwatches with DICKENS
E.showScroller ⇒
Call type:
E.showScroller(options)
Parameters
options
- An object containing { h, c, draw, select, back, remove }
(see below)
Returns
A menu object with draw()
and drawItem(itemNo)
functions
Description
Display a scrollable menu on the screen, and set up the buttons/touchscreen to navigate through it and select items.
Supply an object containing:
{
h : 24, // height of each menu item in pixels
c : 10, // number of menu items
// a function to draw a menu item
draw : function(idx, rect) { ... }
// a function to call when the item is selected, touch parameter is only relevant
// for Bangle.js 2 and contains the coordinates touched inside the selected item
select : function(idx, touch) { ... }
// optional function to be called when 'back' is tapped
back : function() { ...}
// Bangle.js: optional function to be called when the scroller should be removed
remove : function() {}
}
For example to display a list of numbers:
E.showScroller({
h : 40, c : 8,
draw : (idx, r) => {
g.setBgColor((idx&1)?"#666":"#999").clearRect(r.x,r.y,r.x+r.w-1,r.y+r.h-1);
g.setFont("6x8:2").drawString("Item Number\n"+idx,r.x+10,r.y+4);
},
select : (idx) => console.log("You selected ", idx)
});
To remove the scroller, just call E.showScroller()
Note: This is only available in Bangle.js smartwatches
Note: This is only available in Bangle.js smartwatches with Bangle.js 2 smartwatches
E.srand ⇒
Call type:
E.srand(v)
Parameters
v
- The 32 bit integer seed to use for the random number generator
Description
Set the seed for the random number generator used by Math.random()
.
Note: This is not available in devices with low flash memory
E.stopEventPropagation ⇒
Call type:
E.stopEventPropagation()
Description
When using events with X.on('foo', function() { ... })
and then X.emit('foo')
you might want to stop subsequent
event handlers from being executed.
Calling this function doing the execution of events will ensure that no subsequent event handlers are executed.
var X = {}; // in Espruino all objects are EventEmitters
X.on('foo', function() { print("A"); })
X.on('foo', function() { print("B"); E.stopEventPropagation(); })
X.on('foo', function() { print("C"); })
X.emit('foo');
// prints A,B but not C
E.sum ⇒
Call type:
E.sum(arr)
Parameters
arr
- The array to sum
Returns
The sum of the given buffer
Description
Sum the contents of the given Array, String or ArrayBuffer and return the result
Note: This is not available in devices with low flash memory
E.toArrayBuffer ⇒
Call type:
E.toArrayBuffer(str)
Parameters
str
- The string to convert to an ArrayBuffer
Returns
An ArrayBuffer that uses the given string
Description
Create an ArrayBuffer from the given string. This is done via a reference, not a copy - so it is very fast and memory efficient.
Note that this is an ArrayBuffer, not a Uint8Array. To get one of those, do:
new Uint8Array(E.toArrayBuffer('....'))
.
E.toFlatString ⇒
Call type:
E.toFlatString(args, ...)
Parameters
args, ...
- The arguments to convert to a Flat String
Returns
A Flat String (or undefined)
Description
Returns a Flat String
representing the data in the arguments, or undefined
if one can't be allocated.
This provides the same behaviour that E.toString
had in Espruino before 2v18 - see E.toString
for
more information.
E.toJS ⇒
Call type:
E.toJS(arg)
Parameters
arg
- The JS variable to convert to a string
Returns
A String
Description
This performs the same basic function as JSON.stringify
, however
JSON.stringify
adds extra characters to conform to the JSON spec which aren't
required if outputting JS.
E.toJS
will also stringify JS functions, whereas JSON.stringify
ignores
them.
For example:
JSON.stringify({a:1,b:2}) == '{"a":1,"b":2}'
E.toJS({a:1,b:2}) == '{a:1,b:2}'
Note: Strings generated with E.toJS
can't be reliably parsed by
JSON.parse
- however they are valid JS so will work with eval
(but this has
security implications if you don't trust the source of the string).
On the desktop JSON5 parsers will parse the
strings produced by E.toJS
without trouble.
E.toString ⇒
Call type:
E.toString(args, ...)
Parameters
args, ...
- The arguments to convert to a String
Returns
A String
Description
Returns a String
representing the data in the arguments.
This creates a string from the given arguments in the same way as E.toUint8Array
. If each argument is:
- A String or an Array, each element is traversed and added as an 8 bit character
{data : ..., count : N}
causesdata
to be repeatedcount
times{callback : fn}
calls the function and adds the result- Anything else is converted to a character directly.
In the case where there's one argument which is an 8 bit typed array backed by a flat string of the same length, the backing string will be returned without doing a copy or other allocation. The same applies if there's a single argument which is itself a flat string.
```JS E.toString(0,1,2,"Hi",3) "\0\1\2Hi\3" E.toString(1,2,{data:[3,4], count:4},5,6) "\1\2\3\4\3\4\3\4\3\4\5\6"
E.toString(1,2,{callback : () => "Hello World"},5,6) ="\1\2Hello World\5\6" ```
Note: Prior to Espruino 2v18 E.toString
would always return a flat string,
or would return undefined
if one couldn't be allocated. Now, it will return
a normal (fragmented) String if a contiguous chunk of memory cannot be allocated.
You can still check if the returned value is a Flat string using E.getAddressOf(str, true)!=0
,
or can use E.toFlatString
instead.
event E.touch ⇒
Call type:
E.on('touch', function(x, y, b) { ... });
Parameters
x
- X coordinate in display coordinates
y
- Y coordinate in display coordinates
b
- Touch count - 0 for released, 1 for pressed
Description
This event is called when a full touchscreen device on an Espruino is interacted with.
Note: This event is not implemented on Bangle.js because it only has a two area touchscreen.
To use the touchscreen to draw lines, you could do:
var last;
E.on('touch',t=>{
if (last) g.lineTo(t.x, t.y);
else g.moveTo(t.x, t.y);
last = t.b;
});
E.toUint8Array ⇒
Call type:
E.toUint8Array(args, ...)
Parameters
args, ...
- The arguments to convert to a Uint8Array
Returns
A Uint8Array
Description
This creates a Uint8Array from the given arguments. These are handled as follows:
Number
-> read as an integer, using the lowest 8 bitsString
-> use each character's numeric value (e.g.String.charCodeAt(...)
)Array
-> Call itself on each elementArrayBuffer
or Typed Array -> use the lowest 8 bits of each elementObject
:{data:..., count: int}
-> call itselfobject.count
times, onobject.data
{callback : function}
-> call the given function, call itself on return value
For example:
E.toUint8Array([1,2,3])
=new Uint8Array([1, 2, 3])
E.toUint8Array([1,{data:2,count:3},3])
=new Uint8Array([1, 2, 2, 2, 3])
E.toUint8Array("Hello")
=new Uint8Array([72, 101, 108, 108, 111])
E.toUint8Array(["hi",{callback:function() { return [1,2,3] }}])
=new Uint8Array([104, 105, 1, 2, 3])
E.unmountSD ⇒
Call type:
E.unmountSD()
Description
Unmount the SD card, so it can be removed. If you remove the SD card without
calling this you may cause corruption, and you will be unable to access another
SD card until you reset Espruino or call E.unmountSD()
.
E.variance ⇒
Call type:
E.variance(arr, mean)
Parameters
arr
- The array to work out the variance for
mean
- The mean value of the array
Returns
The variance of the given buffer
Description
Work out the variance of the contents of the given Array, String or ArrayBuffer and return the result. This is equivalent to
v=0;for (i in arr)
v+=Math.pow(mean-arr[i],2)
Note: This is not available in devices with low flash memory
Error Class
The base class for runtime errors
Methods and Fields
constructor Error ⇒
Call type:
new Error(message)
Parameters
message
- [optional] An message string
Returns
An Error object
Description
Creates an Error object
function Error.toString ⇒
Call type:
function Error.toString()
Returns
A String
ESP32 Class
Class containing utility functions for the ESP32
Methods and Fields
- ESP32.deepSleep(us)
- ESP32.deepSleepExt0(pin, level)
- ESP32.deepSleepExt1(pinVar, mode)
- ESP32.enableBLE(enable)
- ESP32.enableWifi(enable)
- ESP32.getState()
- ESP32.getWakeupCause()
- ESP32.reboot()
- ESP32.setAtten(pin, atten)
- ESP32.setBLE_Debug(level)
- ESP32.setOTAValid(isValid)
ESP32.deepSleep ⇒
Call type:
ESP32.deepSleep(us)
Parameters
us
- Sleeptime in us
Description
Put device in deepsleep state for "us" microseconds.
Note: This is only available in ESP32 boards
ESP32.deepSleepExt0 ⇒
Call type:
ESP32.deepSleepExt0(pin, level)
Parameters
pin
- Pin to trigger wakeup
level
- Logic level to trigger
Description
Put device in deepsleep state until interrupted by pin "pin". Eligible pin numbers are restricted to those GPIOs designated as RTC GPIOs.
Note: This is only available in ESP32 boards
ESP32.deepSleepExt1 ⇒
Call type:
ESP32.deepSleepExt1(pinVar, mode)
Parameters
pinVar
- Array of Pins to trigger wakeup
mode
- Trigger mode
Description
Put device in deepsleep state until interrupted by pins in the "pinVar" array. The trigger "mode" determines the pin state which will wake up the device. Valid modes are:
0: ESP_EXT1_WAKEUP_ALL_LOW
- all nominated pins must be set LOW to trigger wakeup1: ESP_EXT1_WAKEUP_ANY_HIGH
- any of nominated pins set HIGH will trigger wakeup
Eligible pin numbers are restricted to those GPIOs designated as RTC GPIOs.
Note: This is only available in ESP32 boards
ESP32.enableBLE ⇒
Call type:
ESP32.enableBLE(enable)
Parameters
enable
- switches Bluetooth on or off
Description
Switches Bluetooth off/on, removes saved code from Flash, resets the board, and on restart creates jsVars depending on available heap (actual additional 1800)
Note: This is only available in devices with Bluetooth LE capability
ESP32.enableWifi ⇒
Call type:
ESP32.enableWifi(enable)
Parameters
enable
- switches Wifi on or off
Description
Switches Wifi off/on, removes saved code from Flash, resets the board, and on restart creates jsVars depending on available heap (actual additional 3900)
Note: This is only available in ESP32 boards
ESP32.getState ⇒
Call type:
ESP32.getState()
Returns
The state of the ESP32
Description
Returns an object that contains details about the state of the ESP32 with the following fields:
sdkVersion
- Version of the SDK.freeHeap
- Amount of free heap in bytes.BLE
- Status of BLE, enabled if true.Wifi
- Status of Wifi, enabled if true.minHeap
- Minimum heap, calculated by heapcapsgetminimumfree_size
Note: This is only available in ESP32 boards
ESP32.getWakeupCause ⇒
Call type:
ESP32.getWakeupCause()
Returns
The cause of the ESP32's wakeup from sleep
Description
Returns a variable identifying the cause of wakeup from deep sleep. Possible causes include:
0: ESP_SLEEP_WAKEUP_UNDEFINED
- reset was not caused by exit from deep sleep2: ESP_SLEEP_WAKEUP_EXT0
- Wakeup caused by external signal using RTC_IO3: ESP_SLEEP_WAKEUP_EXT1
- Wakeup caused by external signal using RTC_CNTL4: ESP_SLEEP_WAKEUP_TIMER
- Wakeup caused by timer5: ESP_SLEEP_WAKEUP_TOUCHPAD
- Wakeup caused by touchpad6: ESP_SLEEP_WAKEUP_ULP
- Wakeup caused by ULP program
Note: This is only available in ESP32 boards
ESP32.reboot ⇒
Call type:
ESP32.reboot()
Description
Perform a hardware reset/reboot of the ESP32.
Note: This is only available in ESP32 boards
ESP32.setAtten ⇒
Call type:
ESP32.setAtten(pin, atten)
Parameters
pin
- Pin for Analog read
atten
- Attenuate factor
ESP32.setBLE_Debug ⇒
Call type:
ESP32.setBLE_Debug(level)
Parameters
level
- which events should be shown (GAP=1, GATTS=2, GATTC=4). Use 255 for everything
ESP32.setOTAValid ⇒
Call type:
ESP32.setOTAValid(isValid)
Parameters
isValid
- Set whether this app is valid or not. If isValid==false
the device will reboot.
Description
This function is useful for ESP32 OTA Updates
Normally Espruino is uploaded to the factory
partition so this isn't so useful,
but it is possible to upload Espruino to the ota_0
partition (or ota_1 if a different table has been added).
If this is the case, you can use this function to mark the currently running version of Espruino as good or bad. * If set as valid, Espruino will continue running, and the fact that everything is ok is written to flash * If set as invalid (false) Espruino will mark itself as not working properly and will reboot. The ESP32 bootloader will then start and will load any other partition it can find that is marked as ok.
Note: This is only available in ESP32 boards
ESP8266 Library
The ESP8266 library is specific to the ESP8266 version of Espruino, i.e., running Espruino on an ESP8266 module (not to be confused with using the ESP8266 as Wifi add-on to an Espruino board). This library contains functions to handle ESP8266-specific actions. For example:
var esp8266 = require('ESP8266');
esp8266.reboot();
performs a hardware reset of the module.
Class containing utility functions for the ESP8266
Methods and Fields
- require("ESP8266").crc32(arrayOfData)
- require("ESP8266").deepSleep(micros, option)
- require("ESP8266").dumpSocketInfo()
- require("ESP8266").getFreeFlash()
- require("ESP8266").getResetInfo()
- require("ESP8266").getState()
- require("ESP8266").logDebug(enable)
- require("ESP8266").neopixelWrite(pin, arrayOfData)
- require("ESP8266").ping(ipAddr, pingCallback)
- require("ESP8266").printLog()
- require("ESP8266").readLog()
- require("ESP8266").reboot()
- require("ESP8266").setCPUFreq(freq)
- require("ESP8266").setLog(mode)
ESP8266.crc32 ⇒
Call type:
require("ESP8266").crc32(arrayOfData)
Parameters
arrayOfData
- Array of data to CRC
Returns
32-bit CRC
ESP8266.deepSleep ⇒
Call type:
require("ESP8266").deepSleep(micros, option)
Parameters
micros
- Number of microseconds to sleep.
option
- posible values are 0, 1, 2 or 4
Description
Put the ESP8266 into 'deep sleep' for the given number of microseconds, reducing power consumption drastically.
meaning of option values:
0 - the 108th Byte of init parameter decides whether RF calibration will be performed or not.
1 - run RF calibration after waking up. Power consumption is high.
2 - no RF calibration after waking up. Power consumption is low.
4 - no RF after waking up. Power consumption is the lowest.
Note: unlike normal Espruino boards' 'deep sleep' mode, ESP8266 deep sleep actually turns off the processor. After the given number of microseconds have elapsed, the ESP8266 will restart as if power had been turned off and then back on. All contents of RAM will be lost. Connect GPIO 16 to RST to enable wakeup.
Special: 0 microseconds cause sleep forever until external wakeup RST pull down occurs.
Note: This is only available in ESP8266 boards running Espruino
ESP8266.dumpSocketInfo ⇒
Call type:
require("ESP8266").dumpSocketInfo()
Description
Dumps info about all sockets to the log. This is for troubleshooting the socket implementation.
Note: This is only available in ESP8266 boards running Espruino
ESP8266.getFreeFlash ⇒
Call type:
require("ESP8266").getFreeFlash()
Returns
Array of objects with addr
and length
properties describing the free flash areas available
Description
Note: This is deprecated. Use require("Flash").getFree()
Note: This is only available in ESP8266 boards running Espruino
ESP8266.getResetInfo ⇒
Call type:
require("ESP8266").getResetInfo()
Returns
An object with the reset cause information
Description
At boot time the esp8266's firmware captures the cause of the reset/reboot. This function returns this information in an object with the following fields:
reason
: "power on", "wdt reset", "exception", "soft wdt", "restart", "deep sleep", or "reset pin"exccause
: exception causeepc1
,epc2
,epc3
: instruction pointersexcvaddr
: address being accesseddepc
: (?)
Note: This is only available in ESP8266 boards running Espruino
ESP8266.getState ⇒
Call type:
require("ESP8266").getState()
Returns
The state of the ESP8266
Description
Returns an object that contains details about the state of the ESP8266 with the following fields:
sdkVersion
- Version of the SDK.cpuFrequency
- CPU operating frequency in Mhz.freeHeap
- Amount of free heap in bytes.maxCon
- Maximum number of concurrent connections.flashMap
- Configured flash size&map: '512KB:256/256' .. '4MB:512/512'flashKB
- Configured flash size in KB as integerflashChip
- Type of flash chip as string with manufacturer & chip, ex: '0xEF 0x4016`
Note: This is only available in ESP8266 boards running Espruino
ESP8266.logDebug ⇒
Call type:
require("ESP8266").logDebug(enable)
Parameters
enable
- Enable or disable the debug logging.
Description
Enable or disable the logging of debug information. A value of true
enables
debug logging while a value of false
disables debug logging. Debug output is
sent to UART1 (gpio2).
Note: This is only available in ESP8266 boards running Espruino
ESP8266.neopixelWrite ⇒
Call type:
require("ESP8266").neopixelWrite(pin, arrayOfData)
Parameters
pin
- Pin for output signal.
arrayOfData
- Array of LED data.
Description
This function is deprecated. Please use
require("neopixel").write(pin,
data)
instead
Note: This is only available in ESP8266 boards running Espruino
ESP8266.ping ⇒
Call type:
require("ESP8266").ping(ipAddr, pingCallback)
Parameters
ipAddr
- A string representation of an IP address.
pingCallback
- Optional callback function.
Description
DEPRECATED - please use Wifi.ping
instead.
Perform a network ping request. The parameter can be either a String or a numeric IP address.
Note: This is only available in ESP8266 boards running Espruino
ESP8266.printLog ⇒
Call type:
require("ESP8266").printLog()
Description
Prints the contents of the debug log to the console.
Note: This is only available in ESP8266 boards running Espruino
ESP8266.readLog ⇒
Call type:
require("ESP8266").readLog()
Description
Returns one line from the log or up to 128 characters.
Note: This is only available in ESP8266 boards running Espruino
ESP8266.reboot ⇒
Call type:
require("ESP8266").reboot()
Description
Perform a hardware reset/reboot of the esp8266.
Note: This is only available in ESP8266 boards running Espruino
ESP8266.setCPUFreq ⇒
Call type:
require("ESP8266").setCPUFreq(freq)
Parameters
freq
- Desired frequency - either 80 or 160.
Description
Note:* This is deprecated. Use E.setClock(80/160)
*Note: Set the
operating frequency of the ESP8266 processor. The default is 160Mhz.
Warning: changing the cpu frequency affects the timing of some I/O operations, notably of software SPI and I2C, so things may be a bit slower at 80Mhz.
Note: This is only available in ESP8266 boards running Espruino
ESP8266.setLog ⇒
Call type:
require("ESP8266").setLog(mode)
Parameters
mode
- Debug log mode: 0=off, 1=in-memory only, 2=in-mem and uart0, 3=in-mem and uart1.
Description
Set the debug logging mode. It can be disabled (which frees ~1.2KB of heap), enabled in-memory only, or in-memory and output to a UART.
Note: This is only available in ESP8266 boards running Espruino
Ethernet Class
An instantiation of an Ethernet network adaptor
Methods and Fields
- function Ethernet.getHostname(callback)
- function Ethernet.getIP(options)
- function Ethernet.getStatus(options)
- function Ethernet.setHostname(hostname, callback)
- function Ethernet.setIP(options, callback)
function Ethernet.getHostname ⇒
Call type:
function Ethernet.getHostname(callback)
Parameters
callback
- [optional] An callback(err,hostname)
function to be called back with the status information.
Returns
See description above
Description
Returns the hostname
Note: This is only available in builds with support for WIZnet Ethernet modules built in
function Ethernet.getIP ⇒
Call type:
function Ethernet.getIP(options)
Parameters
options
- [optional] An callback(err, ipinfo)
function to be called back with the IP information.
Returns
See description above
Description
Get the current IP address, subnet, gateway and mac address.
Note: This is only available in builds with support for WIZnet Ethernet modules built in
function Ethernet.getStatus ⇒
Call type:
function Ethernet.getStatus(options)
Parameters
options
- [optional] An callback(err, status)
function to be called back with the status information.
Returns
See description above
Description
Get the current status of the ethernet device
Note: This is only available in builds with support for WIZnet Ethernet modules built in
function Ethernet.setHostname ⇒
Call type:
function Ethernet.setHostname(hostname, callback)
Parameters
hostname
- hostname as string
callback
- [optional] An callback(err)
function to be called back with null or error text.
Returns
True on success
Description
Set hostname used during the DHCP request. Minimum 8 and maximum 12 characters,
best set before calling eth.setIP()
. Default is WIZnet010203, 010203 is the
default nic as part of the mac.
Note: This is only available in builds with support for WIZnet Ethernet modules built in
function Ethernet.setIP ⇒
Call type:
function Ethernet.setIP(options, callback)
Parameters
options
- Object containing IP address options { ip : '1.2.3.4', subnet : '...', gateway: '...', dns:'...', mac:':::::' }
, or do not supply an object in order to force DHCP.
callback
- [optional] An callback(err)
function to invoke when ip is set. err==null
on success, or a string on failure.
Returns
True on success
Description
Set the current IP address or get an IP from DHCP (if no options object is specified)
If 'mac' is specified as an option, it must be a string of the form
"00:01:02:03:04:05"
The default mac is 00:08:DC:01:02:03.
Note: This is only available in builds with support for WIZnet Ethernet modules built in
File Class
This is the File object - it allows you to stream data to and from files (As
opposed to the require('fs').readFile(..)
style functions that read an entire
file).
To create a File object, you must type
var fd =
E.openFile('filepath','mode')
- see E.openFile for more
information.
Note: If you want to remove an SD card after you have started using it, you
must call E.unmountSD()
or you may cause damage to the card.
Methods and Fields
- function File.close()
- function File.pipe(destination, options)
- function File.read(length)
- function File.seek(nBytes)
- function File.skip(nBytes)
- function File.write(buffer)
function File.close ⇒
Call type:
function File.close()
Description
Close an open file.
function File.pipe ⇒
Call type:
function File.pipe(destination, options)
Parameters
destination
- The destination file/stream that will receive content from the source.
options
- [optional] An object { chunkSize : int=32, end : bool=true, complete : function }
chunkSize : The amount of data to pipe from source to destination at a time
complete : a function to call when the pipe activity is complete
end : call the 'end' function on the destination when the source is finished
Description
Pipe this file to a stream (an object with a 'write' method)
Note: This is not available in devices with low flash memory
function File.read ⇒
Call type:
function File.read(length)
Parameters
length
- is an integer specifying the number of bytes to read.
Returns
A string containing the characters that were read
Description
Read data in a file in byte size chunks
function File.seek ⇒
Call type:
function File.seek(nBytes)
Parameters
nBytes
- is an integer specifying the number of bytes to skip forwards.
Description
Seek to a certain position in the file
function File.skip ⇒
Call type:
function File.skip(nBytes)
Parameters
nBytes
- is a positive integer specifying the number of bytes to skip forwards.
Description
Skip the specified number of bytes forward in the file
function File.write ⇒
Call type:
function File.write(buffer)
Parameters
buffer
- A string containing the bytes to write
Returns
the number of bytes written
Description
Write data to a file.
Note: By default this function flushes all changes to the SD card, which
makes it slow (but also safe!). You can use E.setFlags({unsyncFiles:1})
to
disable this behaviour and really speed up writes - but then you must be sure to
close all files you are writing before power is lost or you will cause damage to
your SD card's filesystem.
Flash Library
This module allows you to read and write the nonvolatile flash memory of your device.
Also see the Storage
library, which provides a safer file-like interface to
nonvolatile storage.
It should be used with extreme caution, as it is easy to overwrite parts of Flash memory belonging to Espruino or even its bootloader. If you damage the bootloader then you may need external hardware such as a USB-TTL converter to restore it. For more information on restoring the bootloader see
Advanced
Reflashing
in your board's reference pages.
To see which areas of memory you can and can't overwrite, look at the values
reported by process.memory()
.
Note: On Nordic platforms there are checks in place to help you avoid
'bricking' your device be damaging the bootloader. You can disable these with
E.setFlags({unsafeFlash:1})
Methods and Fields
- require("Flash").erasePage(addr)
- require("Flash").getFree()
- require("Flash").getPage(addr)
- require("Flash").read(length, addr)
- require("Flash").write(data, addr)
Flash.erasePage ⇒
Call type:
require("Flash").erasePage(addr)
Parameters
addr
- An address in the page that is to be erased
Description
Erase a page of flash memory
Note: This is not available in devices with low flash memory
Flash.getFree ⇒
Call type:
require("Flash").getFree()
Returns
Array of objects with addr
and length
properties
Description
This method returns an array of objects of the form {addr : #, length : #}
,
representing contiguous areas of flash memory in the chip that are not used for
anything.
The memory areas returned are on page boundaries. This means that you can safely erase the page containing any address here, and you won't risk deleting part of the Espruino firmware.
Note: This is not available in devices with low flash memory
Flash.getPage ⇒
Call type:
require("Flash").getPage(addr)
Parameters
addr
- An address in memory
Returns
An object of the form { addr : #, length : #}
, where addr
is the start address of the page, and length
is the length of it (in bytes). Returns undefined if no page at address
Description
Returns the start and length of the flash page containing the given address.
Note: This is not available in devices with low flash memory
Flash.read ⇒
Call type:
require("Flash").read(length, addr)
Parameters
length
- The amount of data to read (in bytes)
addr
- The address to start reading from
Returns
A Uint8Array of data
Description
Read flash memory from the given address
Note: This is not available in devices with low flash memory
Flash.write ⇒
Call type:
require("Flash").write(data, addr)
Parameters
data
- The data to write
addr
- The address to start writing from
Description
Write data into memory at the given address
In flash memory you may only turn bits that are 1 into bits that are 0. If
you're writing data into an area that you have already written (so read
doesn't return all 0xFF
) you'll need to call erasePage
to clear the entire
page.
Note: This is not available in devices with low flash memory
Float32Array Class
This is the built-in JavaScript class for a typed array of 32 bit floating point values.
Instantiate this in order to efficiently store arrays of data (Espruino's normal arrays store data in a map, which is inefficient for non-sparse arrays).
Arrays of this type include all the methods from ArrayBufferView
Methods and Fields
constructor Float32Array ⇒
Call type:
new Float32Array(arr, byteOffset, length)
Parameters
arr
- The array or typed array to base this off, or an integer which is the array length
byteOffset
- The byte offset in the ArrayBuffer (ONLY IF the first argument was an ArrayBuffer)
length
- The length (ONLY IF the first argument was an ArrayBuffer)
Returns
A typed array
Description
Create a typed array based on the given input. Either an existing Array Buffer,
an Integer as a Length, or a simple array. If an ArrayBufferView
(e.g.
Uint8Array
rather than ArrayBuffer
) is given, it will be completely copied
rather than referenced.
Float64Array Class
This is the built-in JavaScript class for a typed array of 64 bit floating point values.
Instantiate this in order to efficiently store arrays of data (Espruino's normal arrays store data in a map, which is inefficient for non-sparse arrays).
Arrays of this type include all the methods from ArrayBufferView
Methods and Fields
constructor Float64Array ⇒
Call type:
new Float64Array(arr, byteOffset, length)
Parameters
arr
- The array or typed array to base this off, or an integer which is the array length
byteOffset
- The byte offset in the ArrayBuffer (ONLY IF the first argument was an ArrayBuffer). Maximum 65535.
length
- The length (ONLY IF the first argument was an ArrayBuffer)
Returns
A typed array
Description
Create a typed array based on the given input. Either an existing Array Buffer,
an Integer as a Length, or a simple array. If an ArrayBufferView
(e.g.
Uint8Array
rather than ArrayBuffer
) is given, it will be completely copied
rather than referenced.
fs Library
This library handles interfacing with a FAT32 filesystem on an SD card. The API is designed to be similar to node.js's - However Espruino does not currently support asynchronous file IO, so the functions behave like node.js's xxxxSync functions. Versions of the functions with 'Sync' after them are also provided for compatibility.
To use this, you must type var fs = require('fs')
to get access to the
library
See the page on File IO for more information, and for examples on wiring up an SD card if your device doesn't come with one.
Note: If you want to remove an SD card after you have started using it, you
must call E.unmountSD()
or you may cause damage to the card.
Methods and Fields
- require("fs").appendFile(path, data)
- require("fs").appendFileSync(path, data)
- require("fs").mkdir(path)
- require("fs").mkdirSync(path)
- require("fs").pipe(source, destination, options)
- require("fs").readdir(path)
- require("fs").readdirSync(path)
- require("fs").readFile(path)
- require("fs").readFileSync(path)
- require("fs").statSync(path)
- require("fs").unlink(path)
- require("fs").unlinkSync(path)
- require("fs").writeFile(path, data)
- require("fs").writeFileSync(path, data)
fs.appendFile ⇒
Call type:
require("fs").appendFile(path, data)
Parameters
path
- The path of the file to write
data
- The data to write to the file
Returns
True on success, false on failure
Description
Append the data to the given file, created a new file if it doesn't exist
NOTE: Espruino does not yet support Async file IO, so this function behaves like the 'Sync' version.
fs.appendFileSync ⇒
Call type:
require("fs").appendFileSync(path, data)
Parameters
path
- The path of the file to write
data
- The data to write to the file
Returns
True on success, false on failure
Description
Append the data to the given file, created a new file if it doesn't exist
Note: This is not available in devices with low flash memory
fs.mkdir ⇒
Call type:
require("fs").mkdir(path)
Parameters
path
- The name of the directory to create
Returns
True on success, or false on failure
Description
Create the directory
NOTE: Espruino does not yet support Async file IO, so this function behaves like the 'Sync' version.
Note: This is not available in devices with low flash memory
fs.mkdirSync ⇒
Call type:
require("fs").mkdirSync(path)
Parameters
path
- The name of the directory to create
Returns
True on success, or false on failure
Description
Create the directory
Note: This is not available in devices with low flash memory
fs.pipe ⇒
Call type:
require("fs").pipe(source, destination, options)
Parameters
source
- The source file/stream that will send content.
destination
- The destination file/stream that will receive content from the source.
options
- [optional] An object { chunkSize : int=64, end : bool=true, complete : function }
chunkSize : The amount of data to pipe from source to destination at a time
complete : a function to call when the pipe activity is complete
end : call the 'end' function on the destination when the source is finished
Description
Pipe this file to a destination stream (object which has a .write(data)
method).
Note: This is not available in devices with low flash memory
fs.readdir ⇒
Call type:
require("fs").readdir(path)
Parameters
path
- The path of the directory to list. If it is not supplied, '' is assumed, which will list the root directory
Returns
An array of filename strings (or undefined if the directory couldn't be listed)
Description
List all files in the supplied directory, returning them as an array of strings.
NOTE: Espruino does not yet support Async file IO, so this function behaves like the 'Sync' version.
fs.readdirSync ⇒
Call type:
require("fs").readdirSync(path)
Parameters
path
- The path of the directory to list. If it is not supplied, '' is assumed, which will list the root directory
Returns
An array of filename strings (or undefined if the directory couldn't be listed)
Description
List all files in the supplied directory, returning them as an array of strings.
Note: This is not available in devices with low flash memory
fs.readFile ⇒
Call type:
require("fs").readFile(path)
Parameters
path
- The path of the file to read
Returns
A string containing the contents of the file (or undefined if the file doesn't exist)
Description
Read all data from a file and return as a string
NOTE: Espruino does not yet support Async file IO, so this function behaves like the 'Sync' version.
fs.readFileSync ⇒
Call type:
require("fs").readFileSync(path)
Parameters
path
- The path of the file to read
Returns
A string containing the contents of the file (or undefined if the file doesn't exist)
Description
Read all data from a file and return as a string.
Note: The size of files you can load using this method is limited by the
amount of available RAM. To read files a bit at a time, see the File
class.
Note: This is not available in devices with low flash memory
fs.statSync ⇒
Call type:
require("fs").statSync(path)
Parameters
path
- The path of the file to get information on
Returns
An object describing the file, or undefined on failure
Description
Return information on the given file. This returns an object with the following fields:
size: size in bytes dir: a boolean specifying if the file is a directory or not mtime: A Date structure specifying the time the file was last modified
Note: This is not available in devices with low flash memory
fs.unlink ⇒
Call type:
require("fs").unlink(path)
Parameters
path
- The path of the file to delete
Returns
True on success, or false on failure
Description
Delete the given file
NOTE: Espruino does not yet support Async file IO, so this function behaves like the 'Sync' version.
Note: This is not available in devices with low flash memory
fs.unlinkSync ⇒
Call type:
require("fs").unlinkSync(path)
Parameters
path
- The path of the file to delete
Returns
True on success, or false on failure
Description
Delete the given file
Note: This is not available in devices with low flash memory
fs.writeFile ⇒
Call type:
require("fs").writeFile(path, data)
Parameters
path
- The path of the file to write
data
- The data to write to the file
Returns
True on success, false on failure
Description
Write the data to the given file
NOTE: Espruino does not yet support Async file IO, so this function behaves like the 'Sync' version.
fs.writeFileSync ⇒
Call type:
require("fs").writeFileSync(path, data)
Parameters
path
- The path of the file to write
data
- The data to write to the file
Returns
True on success, false on failure
Description
Write the data to the given file
Note: This is not available in devices with low flash memory
Function Class
This is the built-in class for Functions
Methods and Fields
- function Function.apply(this, args)
- function Function.bind(this, params, ...)
- function Function.call(this, params, ...)
- constructor Function(args, ...)
- function Function.replaceWith(newFunc)
function Function.apply ⇒
Call type:
function Function.apply(this, args)
Parameters
this
- The value to use as the 'this' argument when executing the function
args
- Optional Array of Arguments
Returns
The return value of executing this function
Description
This executes the function with the supplied 'this' argument and parameters
function Function.bind ⇒
Call type:
function Function.bind(this, params, ...)
Parameters
this
- The value to use as the 'this' argument when executing the function
params, ...
- Optional Default parameters that are prepended to the call
Returns
The 'bound' function
Description
This executes the function with the supplied 'this' argument and parameters
function Function.call ⇒
Call type:
function Function.call(this, params, ...)
Parameters
this
- The value to use as the 'this' argument when executing the function
params, ...
- Optional Parameters
Returns
The return value of executing this function
Description
This executes the function with the supplied 'this' argument and parameters
constructor Function ⇒
Call type:
new Function(args, ...)
Parameters
args, ...
- Zero or more arguments (as strings), followed by a string representing the code to run
Returns
A Number object
Description
Creates a function
function Function.replaceWith ⇒
Call type:
function Function.replaceWith(newFunc)
Parameters
newFunc
- The new function to replace this function with
Description
This replaces the function with the one in the argument - while keeping the old function's scope. This allows inner functions to be edited, and is used when edit() is called on an inner function.
Graphics Class
This class provides Graphics operations that can be applied to a surface.
Use Graphics.createXXX to create a graphics object that renders in the way you want. See the Graphics page for more information.
Note: On boards that contain an LCD, there is a built-in g
object of
type Graphics
. For instance to draw a line you'd type:
g.drawLine(0,0,100,100)
Methods and Fields
- function Graphics.asBMP()
- function Graphics.asImage(type)
- function Graphics.asURL()
- function Graphics.blendColor(col_a, col_b, amt)
- function Graphics.blit(options)
- property Graphics.buffer
- function Graphics.clear(reset)
- function Graphics.clearRect(x1, y1, x2, y2)
- Graphics.createArrayBuffer(width, height, bpp, options)
- Graphics.createCallback(width, height, bpp, callback)
- Graphics.createImage(str)
- Graphics.createSDL(width, height, bpp)
- function Graphics.drawCircle(x, y, rad)
- function Graphics.drawCircleAA(x, y, r)
- function Graphics.drawEllipse(x1, y1, x2, y2)
- function Graphics.drawImage(image, x, y, options)
- function Graphics.drawImages(layers, options)
- function Graphics.drawLine(x1, y1, x2, y2)
- function Graphics.drawLineAA(x1, y1, x2, y2)
- function Graphics.drawLineString(str, x, y, options)
- function Graphics.drawPoly(poly, closed)
- function Graphics.drawPolyAA(poly, closed)
- function Graphics.drawRect(x1, y1, x2, y2)
- function Graphics.drawSeg(a, ar, r)
- function Graphics.drawString(str, x, y, solid)
- function Graphics.dump()
- function Graphics.fillAnnulus(x, y, r1, r2)
- function Graphics.fillArc(a1, a2, r)
- function Graphics.fillCircle(x, y, rad)
- function Graphics.fillEllipse(x1, y1, x2, y2)
- function Graphics.fillPoly(poly)
- function Graphics.fillPolyAA(poly)
- function Graphics.fillRect(x1, y1, x2, y2)
- function Graphics.fillSeg(a, ar, r1, r2)
- function Graphics.flip(all)
- function Graphics.floodFill(x, y, col)
- function Graphics.getBgColor()
- function Graphics.getBPP()
- function Graphics.getColor()
- function Graphics.getFont()
- function Graphics.getFontHeight()
- function Graphics.getFonts()
- function Graphics.getHeight()
- Graphics.getInstance()
- function Graphics.getModified(reset)
- function Graphics.getPixel(x, y)
- function Graphics.getVectorFontPolys(str, options)
- function Graphics.getWidth()
- function Graphics.imageMetrics(str)
- function Graphics.lineTo(x, y)
- function Graphics.moveTo(x, y)
- function Graphics.quadraticBezier(arr, options)
- function Graphics.reset()
- function Graphics.saveScreenshot(filename)
- function Graphics.scroll(x, y)
- function Graphics.setBgColor(r, g, b)
- function Graphics.setClipRect(x1, y1, x2, y2)
- function Graphics.setColor(r, g, b)
- function Graphics.setFont(name, size)
- function Graphics.setFont12x20(scale)
- function Graphics.setFont6x15(scale)
- function Graphics.setFontAlign(x, y, rotation)
- function Graphics.setFontBitmap()
- function Graphics.setFontCustom(bitmap, firstChar, width, height)
- function Graphics.setFontLight20()
- function Graphics.setFontPBF(file)
- function Graphics.setFontVector(size)
- function Graphics.setPixel(x, y, col)
- function Graphics.setRotation(rotation, reflect)
- function Graphics.setTheme(theme)
- function Graphics.stringMetrics(str)
- function Graphics.stringWidth(str)
- property Graphics.theme
- function Graphics.toColor(r, g, b)
- function Graphics.transformVertices(verts, transformation)
- function Graphics.wrapString(str, maxWidth)
function Graphics.asBMP ⇒
Call type:
function Graphics.asBMP()
Returns
A String representing the Graphics as a Windows BMP file (or 'undefined' if not possible)
Description
Create a Windows BMP file from this Graphics instance, and return it as a String.
Note: This is not available in devices with low flash memory or 'Original' Espruino boards
function Graphics.asImage ⇒
Call type:
function Graphics.asImage(type)
Parameters
type
- The type of image to return. Either object
/undefined to return an image object, or string
to return an image string
Returns
An Image that can be used with Graphics.drawImage
Description
Return this Graphics object as an Image that can be used with
Graphics.drawImage
. Check out the Graphics reference
page for more information on
images.
Will return undefined if data can't be allocated for the image.
The image data itself will be referenced rather than copied if:
- An image
object
was requested (notstring
) - The Graphics instance was created with
Graphics.createArrayBuffer
- Is 8 bpp OR the
{msb:true}
option was given - No other format options (zigzag/etc) were given
Otherwise data will be copied, which takes up more space and may be quite slow.
If the Graphics
object contains transparent
or pelette
fields,
as you might find in an image,
those will be included in the generated image too.
Note: This is not available in devices with low flash memory
function Graphics.asURL ⇒
Call type:
function Graphics.asURL()
Returns
A String representing the Graphics as a URL (or 'undefined' if not possible)
Description
Create a URL of the form data:image/bmp;base64,...
that can be pasted into the
browser.
The Espruino Web IDE can detect this data on the console and render the image inline automatically.
Note: This is not available in devices with low flash memory or 'Original' Espruino boards
function Graphics.blendColor ⇒
Call type:
function Graphics.blendColor(col_a, col_b, amt)
Parameters
col_a
- Color to blend from (either a single integer color value, or a string)
col_b
- Color to blend to (either a single integer color value, or a string)
amt
- The amount to blend. 0=cola, 1=colb, 0.5=halfway between (and so on)
Returns
The color index represented by the blended colors
Description
Blend between two colors, and return the result.
// dark yellow - halfway between red and green
var col = g.blendColor("#f00","#0f0", 0.5);
// Get a color 25% brighter than the theme's background colour
var col = g.blendColor(g.theme.fg,g.theme.bg, 0.75);
// then...
g.setColor(col).fillRect(10,10,100,100);
Note: This is only available in devices with Antialiasing support included (Bangle.js or Linux)
function Graphics.blit ⇒
Call type:
function Graphics.blit(options)
Parameters
options
- options - see below
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Blit one area of the screen (x1,y1 w,h) to another (x2,y2 w,h)
g.blit({
x1:0, y1:0,
w:32, h:32,
x2:100, y2:100,
setModified : true // should we set the modified area?
});
Note: This uses repeated pixel reads and writes, so will not work on platforms that don't support pixel reads.
Note: This is not available in devices with low flash memory or 'Original' Espruino boards
property Graphics.buffer ⇒
Call type:
property Graphics.buffer
Returns
An ArrayBuffer (or not defined on Graphics instances not created with Graphics.createArrayBuffer
)
Description
On Graphics instances with an offscreen buffer, this is an ArrayBuffer
that
provides access to the underlying pixel data.
g=Graphics.createArrayBuffer(8,8,8)
g.drawLine(0,0,7,7)
print(new Uint8Array(g.buffer))
new Uint8Array([
255, 0, 0, 0, 0, 0, 0, 0,
0, 255, 0, 0, 0, 0, 0, 0,
0, 0, 255, 0, 0, 0, 0, 0,
0, 0, 0, 255, 0, 0, 0, 0,
0, 0, 0, 0, 255, 0, 0, 0,
0, 0, 0, 0, 0, 255, 0, 0,
0, 0, 0, 0, 0, 0, 255, 0,
0, 0, 0, 0, 0, 0, 0, 255])
function Graphics.clear ⇒
Call type:
function Graphics.clear(reset)
Parameters
reset
- [optional] If true
, resets the state of Graphics to the default (eg. Color, Font, etc) as if calling Graphics.reset
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Clear the LCD with the Background Color
function Graphics.clearRect ⇒
Call type:
function Graphics.clearRect(x1, y1, x2, y2)
Parameters
x1
- The left X coordinate OR an object containing {x,y,x2,y2}
or {x,y,w,h}
y1
- The top Y coordinate
x2
- The right X coordinate
y2
- The bottom Y coordinate
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Fill a rectangular area in the Background Color
On devices with enough memory, you can specify {x,y,x2,y2,r}
as the first
argument, which allows you to draw a rounded rectangle.
Note: This is not available in devices with low flash memory
Graphics.createArrayBuffer ⇒
Call type:
Graphics.createArrayBuffer(width, height, bpp, options)
Parameters
width
- Pixels wide
height
- Pixels high
bpp
- Number of bits per pixel
options
- An object of other options. { zigzag : true/false(default), vertical_byte : true/false(default), msb : true/false(default), color_order: 'rgb'(default),'bgr',etc }
zigzag
= whether to alternate the direction of scanlines for rowsvertical_byte
= whether to align bits in a byte vertically or notmsb
= when bits<8, store pixels most significant bit first, when bits>8, store most significant byte firstinterleavex
= Pixels 0,2,4,etc are from the top half of the image, 1,3,5,etc from the bottom half. Used for P3 LED panels.color_order
= re-orders the colour values that are supplied via setColor
Returns
The new Graphics object
Description
Create a Graphics object that renders to an Array Buffer. This will have a field called 'buffer' that can get used to get at the buffer itself
Graphics.createCallback ⇒
Call type:
Graphics.createCallback(width, height, bpp, callback)
Parameters
width
- Pixels wide
height
- Pixels high
bpp
- Number of bits per pixel
callback
- A function of the form function(x,y,col)
that is called whenever a pixel needs to be drawn, or an object with: {setPixel:function(x,y,col),fillRect:function(x1,y1,x2,y2,col)}
. All arguments are already bounds checked.
Returns
The new Graphics object
Description
Create a Graphics object that renders by calling a JavaScript callback function to draw pixels
Note: This is not available in devices with low flash memory
Graphics.createImage ⇒
Call type:
Graphics.createImage(str)
Parameters
str
- A String containing a newline-separated image - space/. is 0, anything else is 1
Returns
An Image object that can be used with Graphics.drawImage
Description
Create a simple Black and White image for use with Graphics.drawImage
.
Use as follows:
var img = Graphics.createImage(`
XXXXXXXXX
X X
X X X
X X X
X X
XXXXXXXXX
`);
g.drawImage(img, x,y);
var img = Graphics.createImage(`
.....
.XXX.
.X.X.
.XXX.
.....
`);
g.drawImage(img, x,y);
If the characters at the beginning and end of the string are newlines, they will
be ignored. Spaces are treated as 0
, and any other character is a 1
Note: This is not available in devices with low flash memory or 'Original' Espruino boards
Graphics.createSDL ⇒
Call type:
Graphics.createSDL(width, height, bpp)
Parameters
width
- Pixels wide
height
- Pixels high
bpp
- Bits per pixel (8,16,24 or 32 supported)
Returns
The new Graphics object
Description
Create a Graphics object that renders to SDL window (Linux-based devices only)
Note: This is only available in Linux with SDL support compiled in
function Graphics.drawCircle ⇒
Call type:
function Graphics.drawCircle(x, y, rad)
Parameters
x
- The X axis
y
- The Y axis
rad
- The circle radius
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Draw an unfilled circle 1px wide in the Foreground Color
Note: This is not available in devices with low flash memory
function Graphics.drawCircleAA ⇒
Call type:
function Graphics.drawCircleAA(x, y, r)
Parameters
x
- Centre x-coordinate
y
- Centre y-coordinate
r
- Radius
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Draw a circle, centred at (x,y) with radius r in the current foreground color
Note: This is only available in devices with Antialiasing support included (Bangle.js or Linux)
function Graphics.drawEllipse ⇒
Call type:
function Graphics.drawEllipse(x1, y1, x2, y2)
Parameters
x1
- The left X coordinate
y1
- The top Y coordinate
x2
- The right X coordinate
y2
- The bottom Y coordinate
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Draw an ellipse in the Foreground Color
Note: This is not available in devices with low flash memory
function Graphics.drawImage ⇒
Call type:
function Graphics.drawImage(image, x, y, options)
Parameters
image
- An image to draw, either a String or an Object (see below)
x
- The X offset to draw the image
y
- The Y offset to draw the image
options
- options for scaling,rotation,etc (see below)
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Image can be:
- An object with the following fields
. bpp = bits per pixel (default is 1), transparent (if defined) is the colour that will be treated as transparent, and palette is a color palette that each pixel will be looked up in first{ width : int, height : int, bpp : optional int, buffer : ArrayBuffer/String, transparent: optional int, palette : optional Uint16Array(2/4/16) }
- A String where the the first few bytes are:
width,height,bpp,[transparent,]image_bytes...
. If a transparent colour is specified the top bit ofbpp
should be set. - An ArrayBuffer Graphics object (if
bpp<8
,msb:true
must be set) - this is disabled on devices without much flash memory available. If a Graphics object is supplied, it can also contain transparent/palette fields as if it were an image.
See https://www.espruino.com/Graphics#images-bitmaps for more information about image formats.
Draw an image at the specified position.
- If the image is 1 bit, the graphics foreground/background colours will be used.
- If
img.palette
is a Uint16Array or 2/4/16 elements, color data will be looked from the supplied palette - On Bangle.js, 2 bit images blend from background(0) to foreground(1) colours
- On Bangle.js, 4 bit images use the Apple Mac 16 color palette
- On Bangle.js, 8 bit images use the Web Safe 216 color palette
- Otherwise color data will be copied as-is. Bitmaps are rendered MSB-first
If options
is supplied, drawImage
will allow images to be rendered at any
scale or angle. If options.rotate
is set it will center images at x,y
.
options
must be an object of the form:
{
rotate : float, // the amount to rotate the image in radians (default 0)
scale : float, // the amount to scale the image up (default 1)
frame : int // if specified and the image has frames of data
// after the initial frame, draw one of those frames from the image
filter : bool // (2v19+) when set, if scale<0.75 perform 2x2 supersampling to smoothly downscale the image
}
For example:
// In the top left of the screen
g.drawImage(img,0,0);
// In the top left of the screen, twice as big
g.drawImage(img,0,0,{scale:2});
// In the center of the screen, twice as big, 45 degrees
g.drawImage(img, g.getWidth()/2, g.getHeight()/2,
{scale:2, rotate:Math.PI/4});
function Graphics.drawImages ⇒
Call type:
function Graphics.drawImages(layers, options)
Parameters
layers
- An array of objects {x,y,image,scale,rotate,center} (up to 3)
options
- options for rendering - see below
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Draws multiple images at once - which avoids flicker on unbuffered systems like Bangle.js. Maximum layer count right now is 4.
layers = [ {
{x : int, // x start position
y : int, // y start position
image : string/object,
scale : float, // scale factor, default 1
rotate : float, // angle in radians
center : bool // center on x,y? default is top left
repeat : should this image be repeated (tiled?)
nobounds : bool // if true, the bounds of the image are not used to work out the default area to draw
}
]
options = { // the area to render. Defaults to rendering just enough to cover what's requested
x,y,
width,height
}
Note: This is only available in Bangle.js smartwatches and Linux-based builds
function Graphics.drawLine ⇒
Call type:
function Graphics.drawLine(x1, y1, x2, y2)
Parameters
x1
- The left
y1
- The top
x2
- The right
y2
- The bottom
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Draw a line between x1,y1 and x2,y2 in the current foreground color
function Graphics.drawLineAA ⇒
Call type:
function Graphics.drawLineAA(x1, y1, x2, y2)
Parameters
x1
- The left
y1
- The top
x2
- The right
y2
- The bottom
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Draw a line between x1,y1 and x2,y2 in the current foreground color
Note: This is only available in devices with Antialiasing support included (Bangle.js or Linux)
function Graphics.drawLineString ⇒
Call type:
function Graphics.drawLineString(str, x, y, options)
Parameters
str
- The string
x
- The X position of the start of the text string
y
- The Y position of the middle of the text string
options
- Options for drawing this font (see below)
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Draw a string of text as a fixed-width line font
options
contains:
size
: font size in pixels (char width is half font size) - default 16rotate
: Initial rotation in radians - default 0twist
: Subsequent rotation per character in radians - default 0
Note: This is only available in DICKENS
function Graphics.drawPoly ⇒
Call type:
function Graphics.drawPoly(poly, closed)
Parameters
poly
- An array of vertices, of the form [x1,y1,x2,y2,x3,y3,etc]
closed
- Draw another line between the last element of the array and the first
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Draw a polyline (lines between each of the points in poly
) in the current
foreground color
Note: there is a limit of 64 points (128 XY elements) for polygons
Note: This is not available in devices with low flash memory
function Graphics.drawPolyAA ⇒
Call type:
function Graphics.drawPolyAA(poly, closed)
Parameters
poly
- An array of vertices, of the form [x1,y1,x2,y2,x3,y3,etc]
closed
- Draw another line between the last element of the array and the first
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Draw an antialiased polyline (lines between each of the points in poly
) in
the current foreground color
Note: there is a limit of 64 points (128 XY elements) for polygons
Note: This is only available in devices with Antialiasing support included (Bangle.js or Linux)
function Graphics.drawRect ⇒
Call type:
function Graphics.drawRect(x1, y1, x2, y2)
Parameters
x1
- The left X coordinate OR an object containing {x,y,x2,y2}
or {x,y,w,h}
y1
- The top Y coordinate
x2
- The right X coordinate
y2
- The bottom Y coordinate
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Draw an unfilled rectangle 1px wide in the Foreground Color
function Graphics.drawSeg ⇒
Call type:
function Graphics.drawSeg(a, ar, r)
Parameters
a
- Angle (radians)
ar
- Angle either side (radians)
r
- Radius
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Draw A line between angles a-ar and a+ar at radius r
Note: This is only available in DICKENS
function Graphics.drawString ⇒
Call type:
function Graphics.drawString(str, x, y, solid)
Parameters
str
- The string
x
- The X position of the leftmost pixel
y
- The Y position of the topmost pixel
solid
- For bitmap fonts, should empty pixels be filled with the background color?
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Draw a string of text in the current font.
g.drawString("Hello World", 10, 10);
Images may also be embedded inside strings (e.g. to render Emoji or characters
not in the current font). To do this, just add 0
then the image string (about
Images) For example:
g.drawString("Hi \0\7\5\1\x82 D\x17\xC0");
// draws:
// # # # # #
// # # #
// ### ## #
// # # # # #
// # # ### #####
function Graphics.dump ⇒
Call type:
function Graphics.dump()
Description
Output this image as a bitmap URL of the form data:image/bmp;base64,...
. The
Espruino Web IDE will detect this on the console and will render the image
inline automatically.
This is identical to console.log(g.asURL())
- it is just a convenient function
for easy debugging and producing screenshots of what is currently in the
Graphics instance.
Note: This may not work on some bit depths of Graphics instances. It will also not work for the main Graphics instance of Bangle.js 1 as the graphics on Bangle.js 1 are stored in write-only memory.
Note: This is not available in devices with low flash memory or 'Original' Espruino boards
function Graphics.fillAnnulus ⇒
Call type:
function Graphics.fillAnnulus(x, y, r1, r2)
Parameters
x
- The X axis
y
- The Y axis
r1
- The annulus inner radius
r2
- The annulus outer radius
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Draw a filled annulus in the Foreground Color
Note: This is only available in DICKENS
function Graphics.fillArc ⇒
Call type:
function Graphics.fillArc(a1, a2, r)
Parameters
a1
- Angle 1 (radians)
a2
- Angle 2 (radians)
r
- Radius
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Draw a filled arc between two angles
Note: This is only available in DICKENS
function Graphics.fillCircle ⇒
Call type:
function Graphics.fillCircle(x, y, rad)
Parameters
x
- The X axis
y
- The Y axis
rad
- The circle radius
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Draw a filled circle in the Foreground Color
Note: This is not available in devices with low flash memory
function Graphics.fillEllipse ⇒
Call type:
function Graphics.fillEllipse(x1, y1, x2, y2)
Parameters
x1
- The left X coordinate
y1
- The top Y coordinate
x2
- The right X coordinate
y2
- The bottom Y coordinate
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Draw a filled ellipse in the Foreground Color
Note: This is not available in devices with low flash memory
function Graphics.fillPoly ⇒
Call type:
function Graphics.fillPoly(poly)
Parameters
poly
- An array of vertices, of the form [x1,y1,x2,y2,x3,y3,etc]
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Draw a filled polygon in the current foreground color.
g.fillPoly([
16, 0,
31, 31,
26, 31,
16, 12,
6, 28,
0, 27 ]);
This fills from the top left hand side of the polygon (low X, low Y) down to
but not including the bottom right. When placed together polygons will align
perfectly without overdraw - but this will not fill the same pixels as
drawPoly
(drawing a line around the edge of the polygon).
Note: there is a limit of 64 points (128 XY elements) for polygons
Note: This is not available in devices with low flash memory
function Graphics.fillPolyAA ⇒
Call type:
function Graphics.fillPolyAA(poly)
Parameters
poly
- An array of vertices, of the form [x1,y1,x2,y2,x3,y3,etc]
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Draw a filled polygon in the current foreground color.
g.fillPolyAA([
16, 0,
31, 31,
26, 31,
16, 12,
6, 28,
0, 27 ]);
This fills from the top left hand side of the polygon (low X, low Y) down to
but not including the bottom right. When placed together polygons will align
perfectly without overdraw - but this will not fill the same pixels as
drawPoly
(drawing a line around the edge of the polygon).
Note: there is a limit of 64 points (128 XY elements) for polygons
Note: This is only available in devices with Antialiasing support included (Bangle.js or Linux)
function Graphics.fillRect ⇒
Call type:
function Graphics.fillRect(x1, y1, x2, y2)
Parameters
x1
- The left X coordinate OR an object containing {x,y,x2,y2}
or {x,y,w,h}
y1
- The top Y coordinate
x2
- The right X coordinate
y2
- The bottom Y coordinate
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Fill a rectangular area in the Foreground Color
On devices with enough memory, you can specify {x,y,x2,y2,r}
as the first
argument, which allows you to draw a rounded rectangle.
function Graphics.fillSeg ⇒
Call type:
function Graphics.fillSeg(a, ar, r1, r2)
Parameters
a
- Angle (radians)
ar
- Angle either side (radians)
r1
- Radius
r2
- Radius
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Draw rectangle between angles a-ar and a+ar, and radius r1/r2
Note: This is only available in DICKENS
function Graphics.flip ⇒
Call type:
function Graphics.flip(all)
Parameters
all
- [optional] (only on some devices) If true
then copy all pixels, not just those that have changed.
Description
On instances of graphics that drive a display with an offscreen buffer, calling this function will copy the contents of the offscreen buffer to the screen.
Call this when you have drawn something to Graphics and you want it shown on the screen.
If a display does not have an offscreen buffer, it may not have a g.flip()
method.
On Bangle.js 1, there are different graphics modes chosen with
Bangle.setLCDMode()
. The default mode is unbuffered and in this mode
g.flip()
does not affect the screen contents.
On some devices, this command will attempt to only update the areas of the
screen that have changed in order to increase speed. If you have accessed the
Graphics.buffer
directly then you may need to use Graphics.flip(true)
to
force a full update of the screen.
function Graphics.floodFill ⇒
Call type:
function Graphics.floodFill(x, y, col)
Parameters
x
- X coordinate to start from
y
- Y coordinate to start from
col
- The color to fill with (if undefined, foreground is used)
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Flood fills the given Graphics instance out from a particular point.
Note: This only works on Graphics instances that support readback with getPixel
. It
is also not capable of filling over dithered patterns (eg non-solid colours on Bangle.js 2)
Note: This is not available in devices with low flash memory or 'Original' Espruino boards
function Graphics.getBgColor ⇒
Call type:
function Graphics.getBgColor()
Returns
The integer value of the colour
Description
Get the background color to use for subsequent drawing operations
function Graphics.getBPP ⇒
Call type:
function Graphics.getBPP()
Returns
The bits per pixel of this Graphics instance
Description
The number of bits per pixel of this Graphics instance
Note: Bangle.js 2 behaves a little differently here. The display is 3 bit,
so getBPP
returns 3 and asBMP
/asImage
/etc return 3 bit images. However in
order to allow dithering, the colors returned by Graphics.getColor
and
Graphics.theme
are actually 16 bits.
function Graphics.getColor ⇒
Call type:
function Graphics.getColor()
Returns
The integer value of the colour
Description
Get the color to use for subsequent drawing operations
function Graphics.getFont ⇒
Call type:
function Graphics.getFont()
Returns
Get the name of the current font
Description
Get the font by name - can be saved and used with Graphics.setFont
.
Normally this might return something like "4x6"
, but if a scale factor is
specified, a colon and then the size is reported, like "4x6:2"
Note: For custom fonts, Custom
is currently reported instead of the font
name.
Note: This is not available in devices with low flash memory
function Graphics.getFontHeight ⇒
Call type:
function Graphics.getFontHeight()
Returns
The height in pixels of the current font
Description
Return the height in pixels of the current font
Note: This is not available in devices with low flash memory
function Graphics.getFonts ⇒
Call type:
function Graphics.getFonts()
Returns
And array of font names
Description
Return an array of all fonts currently in the Graphics library.
Note: Vector fonts are specified as Vector#
where #
is the font height.
As there are effectively infinite fonts, just Vector
is included in the list.
Note: This is not available in devices with low flash memory
function Graphics.getHeight ⇒
Call type:
function Graphics.getHeight()
Returns
The height of this Graphics instance
Description
The height of this Graphics instance
Graphics.getInstance ⇒
Call type:
Graphics.getInstance()
Returns
An instance of Graphics
or undefined
Description
On devices like Pixl.js or HYSTM boards that contain a built-in display this will return an instance of the graphics class that can be used to access that display.
Internally, this is stored as a member called gfx
inside the 'hiddenRoot'.
function Graphics.getModified ⇒
Call type:
function Graphics.getModified(reset)
Parameters
reset
- Whether to reset the modified area or not
Returns
An object {x1,y1,x2,y2} containing the modified area, or undefined if not modified
Description
Return the area of the Graphics canvas that has been modified, and optionally clear the modified area to 0.
For instance if g.setPixel(10,20)
was called, this would return
{x1:10,
y1:20, x2:10, y2:20}
Note: This is not available in devices with low flash memory
function Graphics.getPixel ⇒
Call type:
function Graphics.getPixel(x, y)
Parameters
x
- The left
y
- The top
Returns
The color
Description
Get a pixel's color
function Graphics.getVectorFontPolys ⇒
Call type:
function Graphics.getVectorFontPolys(str, options)
Parameters
str
- The string
options
- [optional] {x,y,w,h}
(see below)
Returns
An array of Uint8Arrays for vector font polygons
Description
Return the current string as a series of polygons (using the current vector font). options
is as follows:
x
- X offset of font (default 0)y
- Y offset of font (default 0)w
- Width of font (default 256) - the actual width will likely be less than this as most characters are non-squareh
- Height of font (default 256) - the actual height will likely be less than this as most characters don't fully fill the font box
g.getVectorFontPolys("Hi", {x:-80,y:-128});
Note: This is not available in devices with low flash memory and not NOVECTORFONT
function Graphics.getWidth ⇒
Call type:
function Graphics.getWidth()
Returns
The width of this Graphics instance
Description
The width of this Graphics instance
function Graphics.imageMetrics ⇒
Call type:
function Graphics.imageMetrics(str)
Parameters
str
- The string
Returns
An object containing {width,height,bpp,transparent}
for the image
Description
Return the width and height in pixels of an image (either Graphics, Image
Object, Image String or ArrayBuffer). Returns undefined
if image couldn't be
decoded.
frames
is also included is the image contains more information than you'd
expect for a single bitmap. In this case the bitmap might be an animation with
multiple frames
function Graphics.lineTo ⇒
Call type:
function Graphics.lineTo(x, y)
Parameters
x
- X value
y
- Y value
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Draw a line from the last position of lineTo
or moveTo
to this position
function Graphics.moveTo ⇒
Call type:
function Graphics.moveTo(x, y)
Parameters
x
- X value
y
- Y value
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Move the cursor to a position - see lineTo
function Graphics.quadraticBezier ⇒
Call type:
function Graphics.quadraticBezier(arr, options)
Parameters
arr
- An array of three vertices, six enties in form of [x0,y0,x1,y1,x2,y2]
options
- number of points to calulate
Returns
Array with calculated points
Description
Calculate the square area under a Bezier curve.
x0,y0: start point x1,y1: control point y2,y2: end point
Max 10 points without start point.
Note: This is not available in devices with low flash memory or 'Original' Espruino boards
function Graphics.reset ⇒
Call type:
function Graphics.reset()
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Reset the state of Graphics to the defaults (e.g. Color, Font, etc) that would have been used when Graphics was initialised.
function Graphics.saveScreenshot ⇒
Call type:
function Graphics.saveScreenshot(filename)
Parameters
filename
- If supplied, a file to save, otherwise 'screenshot.img'
function Graphics.scroll ⇒
Call type:
function Graphics.scroll(x, y)
Parameters
x
- X direction. >0 = to right
y
- Y direction. >0 = down
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Scroll the contents of this graphics in a certain direction. The remaining area is filled with the background color.
Note: This uses repeated pixel reads and writes, so will not work on platforms that don't support pixel reads.
Note: This is not available in devices with low flash memory or 'Original' Espruino boards
function Graphics.setBgColor ⇒
Call type:
function Graphics.setBgColor(r, g, b)
Parameters
r
- Red (between 0 and 1) OR* an integer representing the color in the current bit depth and color order *OR a hexidecimal color string of the form '#012345'
g
- Green (between 0 and 1)
b
- Blue (between 0 and 1)
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Set the background color to use for subsequent drawing operations.
See Graphics.setColor
for more information on the mapping of r
, g
, and b
to pixel values.
Note:* On devices with low flash memory, r
*must be an integer representing the color in the current bit depth. It cannot
be a floating point value, and g
and b
are ignored.
function Graphics.setClipRect ⇒
Call type:
function Graphics.setClipRect(x1, y1, x2, y2)
Parameters
x1
- Top left X coordinate
y1
- Top left Y coordinate
x2
- Bottom right X coordinate
y2
- Bottom right Y coordinate
Returns
The instance of Graphics this was called on, to allow call chaining
Description
This sets the 'clip rect' that subsequent drawing operations are clipped to sit between.
These values are inclusive - e.g. g.setClipRect(1,0,5,0)
will ensure that only
pixel rows 1,2,3,4,5 are touched on column 0.
Note: For maximum flexibility on Bangle.js 1, the values here are not range
checked. For normal use, X and Y should be between 0 and
getWidth()-1
/getHeight()-1
.
Note: The x/y values here are rotated, so that if Graphics.setRotation
is
used they correspond to the coordinates given to the draw functions, not to the
physical device pixels.
Note: This is not available in devices with low flash memory
function Graphics.setColor ⇒
Call type:
function Graphics.setColor(r, g, b)
Parameters
r
- Red (between 0 and 1) OR* an integer representing the color in the current bit depth and color order *OR a hexidecimal color string of the form '#012345'
g
- [optional] Green (between 0 and 1)
b
- [optional] Blue (between 0 and 1)
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Set the color to use for subsequent drawing operations.
If just r
is specified as an integer, the numeric value will be written directly into a pixel. eg. On a 24 bit Graphics
instance you set bright blue with either g.setColor(0,0,1)
or g.setColor(0x0000FF)
.
A good shortcut to ensure you get white on all platforms is to use g.setColor(-1)
The mapping is as follows:
- 32 bit:
r,g,b
=>0xFFrrggbb
- 24 bit:
r,g,b
=>0xrrggbb
- 16 bit:
r,g,b
=>0brrrrrggggggbbbbb
(RGB565) - Other bpp:
r,g,b
=> white ifr+g+b > 50%
, otherwise black (user
on its own as an integer)
If you specified color_order
when creating the Graphics
instance, r
,g
and b
will be swapped as you specified.
Note:* On devices with low flash memory, r
*must be an integer representing the color in the current bit depth. It cannot
be a floating point value, and g
and b
are ignored.
function Graphics.setFont ⇒
Call type:
function Graphics.setFont(name, size)
Parameters
name
- The name of the font to use (if undefined, the standard 4x6 font will be used)
size
- The size of the font (or undefined)
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Set the font by name. Various forms are available:
g.setFont("4x6")
- standard 4x6 bitmap fontg.setFont("Vector:12")
- vector font 12px highg.setFont("4x6:2")
- 4x6 bitmap font, doubled in sizeg.setFont("6x8:2x3")
- 6x8 bitmap font, doubled in width, tripled in height
You can also use these forms, but they are not recommended:
g.setFont("Vector12")
- vector font 12px highg.setFont("4x6",2)
- 4x6 bitmap font, doubled in size
g.getFont()
will return the current font as a String.
For a list of available font names, you can use g.getFonts()
.
Note: This is not available in devices with low flash memory
function Graphics.setFont12x20 ⇒
Call type:
function Graphics.setFont12x20(scale)
Parameters
scale
- [optional] If >1 the font will be scaled up by that amount
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Set the current font
function Graphics.setFont6x15 ⇒
Call type:
function Graphics.setFont6x15(scale)
Parameters
scale
- [optional] If >1 the font will be scaled up by that amount
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Set the current font
function Graphics.setFontAlign ⇒
Call type:
function Graphics.setFontAlign(x, y, rotation)
Parameters
x
- X alignment. -1=left (default), 0=center, 1=right
y
- Y alignment. -1=top (default), 0=center, 1=bottom
rotation
- Rotation of the text. 0=normal, 1=90 degrees clockwise, 2=180, 3=270
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Set the alignment for subsequent calls to drawString
Note: This is not available in devices with low flash memory
function Graphics.setFontBitmap ⇒
Call type:
function Graphics.setFontBitmap()
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Make subsequent calls to drawString
use the built-in 4x6 pixel bitmapped Font
It is recommended that you use Graphics.setFont("4x6")
for more flexibility.
function Graphics.setFontCustom ⇒
Call type:
function Graphics.setFontCustom(bitmap, firstChar, width, height)
Parameters
bitmap
- A column-first, MSB-first, 1bpp bitmap containing the font bitmap
firstChar
- The first character in the font - usually 32 (space)
width
- The width of each character in the font. Either an integer, or a string where each character represents the width
height
- The height as an integer (max 255). Bits 8-15 represent the scale factor (eg. 2<<8
is twice the size). Bits 16-23 represent the BPP (0,1=1 bpp, 2=2 bpp, 4=4 bpp)
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Make subsequent calls to drawString
use a Custom Font of the given height. See
the Fonts page for more information about
custom fonts and how to create them.
For examples of use, see the font modules.
Note: while you can specify the character code of the first character with
firstChar
, the newline character 13 will always be treated as a newline and
not rendered.
Note: This is not available in devices with low flash memory
function Graphics.setFontLight20 ⇒
Call type:
function Graphics.setFontLight20()
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Set the current font
function Graphics.setFontPBF ⇒
Call type:
function Graphics.setFontPBF(file)
Parameters
file
- The font as a PBF file
Returns
The instance of Graphics this was called on, to allow call chaining
function Graphics.setFontVector ⇒
Call type:
function Graphics.setFontVector(size)
Parameters
size
- The height of the font, as an integer
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Make subsequent calls to drawString
use a Vector Font of the given height.
It is recommended that you use Graphics.setFont("Vector", size)
for more
flexibility.
Note: This is not available in devices with low flash memory
function Graphics.setPixel ⇒
Call type:
function Graphics.setPixel(x, y, col)
Parameters
x
- The left
y
- The top
col
- The color (if undefined
, the foreground color is useD)
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Set a pixel's color
function Graphics.setRotation ⇒
Call type:
function Graphics.setRotation(rotation, reflect)
Parameters
rotation
- The clockwise rotation. 0 for no rotation, 1 for 90 degrees, 2 for 180, 3 for 270
reflect
- Whether to reflect the image
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Set the current rotation of the graphics device.
function Graphics.setTheme ⇒
Call type:
function Graphics.setTheme(theme)
Parameters
theme
- An object of the form returned by Graphics.theme
Returns
The instance of Graphics this was called on, to allow call chaining
Description
Set the global colour scheme. On Bangle.js, this is reloaded from
settings.json
for each new app loaded.
See Graphics.theme
for the fields that can be provided. For instance you can
change the background to red using:
g.setTheme({bg:"#f00"});
Note: This is not available in devices with low flash memory or 'Original' Espruino boards
function Graphics.stringMetrics ⇒
Call type:
function Graphics.stringMetrics(str)
Parameters
str
- The string
Returns
An object containing {width,height,etc}
for the string - see below
Description
Return the width and height in pixels of a string of text in the current font. The object returned contains:
JS
{
width, // Width of the string in pixels
height, // Height of the string in pixels
unrenderableChars, // If true, the string contains characters that the current font isn't able to render.
imageCount, // How many inline images are in this string?
maxImageHeight, // If there are images, what is the maximum height of all images?
}
function Graphics.stringWidth ⇒
Call type:
function Graphics.stringWidth(str)
Parameters
str
- The string
Returns
The length of the string in pixels
Description
Return the size in pixels of a string of text in the current font
property Graphics.theme ⇒
Call type:
property Graphics.theme
Returns
An object containing the current 'theme' (see below)
Description
Returns an object of the form:
{
fg : 0xFFFF, // foreground colour
bg : 0, // background colour
fg2 : 0xFFFF, // accented foreground colour
bg2 : 0x0007, // accented background colour
fgH : 0xFFFF, // highlighted foreground colour
bgH : 0x02F7, // highlighted background colour
dark : true, // Is background dark (e.g. foreground should be a light colour)
}
These values can then be passed to g.setColor
/g.setBgColor
for example
g.setColor(g.theme.fg2)
. When the Graphics instance is reset, the background
color is automatically set to g.theme.bg
and foreground is set to
g.theme.fg
.
On Bangle.js these values can be changed by writing updated values to theme
in
settings.js
and reloading the app - or they can be changed temporarily by
calling Graphics.setTheme
Note: This is not available in devices with low flash memory or 'Original' Espruino boards
function Graphics.toColor ⇒
Call type:
function Graphics.toColor(r, g, b)
Parameters
r
- Red (between 0 and 1) OR* an integer representing the color in the current bit depth and color order *OR a hexidecimal color string of the form '#rrggbb' or
'#rgb'`
g
- Green (between 0 and 1)
b
- Blue (between 0 and 1)
Returns
The color index represented by the arguments
Description
Work out the color value to be used in the current bit depth based on the arguments.
This is used internally by setColor and setBgColor
// 1 bit
g.toColor(1,1,1) => 1
// 16 bit
g.toColor(1,0,0) => 0xF800
Note: This is not available in devices with low flash memory
function Graphics.transformVertices ⇒
Call type:
function Graphics.transformVertices(verts, transformation)
Parameters
verts
- An array of vertices, of the form [x1,y1,x2,y2,x3,y3,etc]
transformation
- The transformation to apply, either an Object or an Array (see below)
Returns
Array of transformed vertices
Description
Transformation can be:
- An object of the form
{ x: float, // x offset (default 0) y: float, // y offset (default 0) scale: float, // scale factor (default 1) rotate: float, // angle in radians (default 0) }
A six-element array of the form
[a,b,c,d,e,f]
, which represents the 2D transformation matrixa c e b d f 0 0 1
Apply a transformation to an array of vertices.
Note: This is not available in devices with low flash memory or 'Original' Espruino boards
function Graphics.wrapString ⇒
Call type:
function Graphics.wrapString(str, maxWidth)
Parameters
str
- The string
maxWidth
- The width in pixels
Returns
An array of lines that are all less than maxWidth
Description
Wrap a string to the given pixel width using the current font, and return the lines as an array.
To render within the screen's width you can do:
g.drawString(g.wrapString(text, g.getWidth()).join("\n")),
heatshrink Library
Simple library for compression/decompression using heatshrink, an LZSS compression tool.
Espruino uses heatshrink internally to compress RAM down to fit in Flash memory
when save()
is used. This just exposes that functionality.
Functions here take and return buffers of data. There is no support for streaming, so both the compressed and decompressed data must be able to fit in memory at the same time.
var c = require("heatshrink").compress("Hello World");
// =new Uint8Array([....]).buffer
var d = require("heatshrink").decompress(c);
// =new Uint8Array([72, 101, ...]).buffer
E.toString(d)
// ="Hello World"
If you'd like a way to perform compression/decompression on desktop, check out https://github.com/espruino/EspruinoWebTools#heatshrinkjs
Methods and Fields
heatshrink.compress ⇒
Call type:
require("heatshrink").compress(data)
Parameters
data
- The data to compress
Returns
Returns the result as an ArrayBuffer
Description
Compress the data supplied as input, and return heatshrink encoded data as an ArrayBuffer.
No type information is stored, and the data
argument is treated as an array of bytes
(whether it is a String
/Uint8Array
or even Uint16Array
), so the result of
decompressing any compressed data will always be an ArrayBuffer.
If you'd like a way to perform compression/decompression on desktop, check out https://github.com/espruino/EspruinoWebTools#heatshrinkjs
Note: This is not available in devices with low flash memory
heatshrink.decompress ⇒
Call type:
require("heatshrink").decompress(data)
Parameters
data
- The data to decompress
Returns
Returns the result as an ArrayBuffer
Description
Decompress the heatshrink-encoded data supplied as input, and return it as an ArrayBuffer
.
To get the result as a String, wrap require("heatshrink").decompress
in E.toString
: E.toString(require("heatshrink").decompress(...))
If you'd like a way to perform compression/decompression on desktop, check out https://github.com/espruino/EspruinoWebTools#heatshrinkjs
Note: This is not available in devices with low flash memory
http Library
This library allows you to create http servers and make http requests
In order to use this, you will need an extra module to get network connectivity such as the TI CC3000 or WIZnet W5500.
This is designed to be a cut-down version of the node.js library. Please see the Internet page for more information on how to use it.
Methods and Fields
- require("http").createServer(callback)
- require("http").get(options, callback)
- require("http").request(options, callback)
http.createServer ⇒
Call type:
require("http").createServer(callback)
Parameters
callback
- A function(request,response) that will be called when a connection is made
Returns
Returns a new httpSrv object
Description
Create an HTTP Server
When a request to the server is made, the callback is called. In the callback
you can use the methods on the response (httpSRs
) to send data. You can also
add request.on('data',function() { ... })
to listen for POSTed data
http.get ⇒
Call type:
require("http").get(options, callback)
Parameters
options
- A simple URL, or an object containing host,port,path,method fields
callback
- A function(res) that will be called when a connection is made. You can then call res.on('data', function(data) { ... })
and res.on('close', function() { ... })
to deal with the response.
Returns
Returns a new httpCRq object
Description
Request a webpage over HTTP - a convenience function for http.request()
that
makes sure the HTTP command is 'GET', and that calls end
automatically.
require("http").get("http://pur3.co.uk/hello.txt", function(res) {
res.on('data', function(data) {
console.log("HTTP> "+data);
});
res.on('close', function(data) {
console.log("Connection closed");
});
});
See http.request()
and the Internet page and ` for more usage
examples.
http.request ⇒
Call type:
require("http").request(options, callback)
Parameters
options
- An object containing host,port,path,method,headers fields (and also ca,key,cert if HTTPS is enabled)
callback
- A function(res) that will be called when a connection is made. You can then call res.on('data', function(data) { ... })
and res.on('close', function() { ... })
to deal with the response.
Returns
Returns a new httpCRq object
Description
Create an HTTP Request - end()
must be called on it to complete the operation.
options
is of the form:
var options = {
host: 'example.com', // host name
port: 80, // (optional) port, defaults to 80
path: '/', // path sent to server
method: 'GET', // HTTP command sent to server (must be uppercase 'GET', 'POST', etc)
protocol: 'http:', // optional protocol - https: or http:
headers: { key : value, key : value } // (optional) HTTP headers
};
var req = require("http").request(options, function(res) {
res.on('data', function(data) {
console.log("HTTP> "+data);
});
res.on('close', function(data) {
console.log("Connection closed");
});
});
// You can req.write(...) here if your request requires data to be sent.
req.end(); // called to finish the HTTP request and get the response
You can easily pre-populate options
from a URL using
var options =
url.parse("http://www.example.com/foo.html")
There's an example of using http.request
for HTTP POST
here
Note: if TLS/HTTPS is enabled, options can have ca
, key
and cert
fields. See tls.connect
for more information about these and how to use them.
httpCRq Class
The HTTP client request, returned by http.request()
and http.get()
.
Methods and Fields
event httpCRq.drain ⇒
Call type:
httpCRq.on('drain', function() { ... });
Description
An event that is fired when the buffer is empty and it can accept more data to send.
function httpCRq.end ⇒
Call type:
function httpCRq.end(data)
Parameters
data
- A string containing data to send
Description
Finish this HTTP request - optional data to append as an argument
See Socket.write
for more information about the data argument
event httpCRq.error ⇒
Call type:
httpCRq.on('error', function() { ... });
Description
An event that is fired if there is an error making the request and the response
callback has not been invoked. In this case the error event concludes the
request attempt. The error event function receives an error object as parameter
with a code
field and a message
field.
function httpCRq.write ⇒
Call type:
function httpCRq.write(data)
Parameters
data
- A string containing data to send
Returns
For node.js compatibility, returns the boolean false. When the send buffer is empty, a drain
event will be sent
Description
This function writes the data
argument as a string. Data that is passed in
(including arrays) will be converted to a string with the normal JavaScript
toString
method. For more information about sending binary data see
Socket.write
httpCRs Class
The HTTP client response, passed to the callback of http.request()
an
http.get()
.
Methods and Fields
- function httpCRs.available()
- event httpCRs.close()
- event httpCRs.data(data)
- event httpCRs.error()
- property httpCRs.headers
- property httpCRs.httpVersion
- function httpCRs.pipe(destination, options)
- function httpCRs.read(chars)
- property httpCRs.statusCode
- property httpCRs.statusMessage
function httpCRs.available ⇒
Call type:
function httpCRs.available()
Returns
How many bytes are available
Description
Return how many bytes are available to read. If there is a 'data' event handler, this will always return 0.
event httpCRs.close ⇒
Call type:
httpCRs.on('close', function() { ... });
Description
Called when the connection closes with one hadError
boolean parameter, which
indicates whether an error occurred.
event httpCRs.data ⇒
Call type:
httpCRs.on('data', function(data) { ... });
Parameters
data
- A string containing one or more characters of received data
Description
The 'data' event is called when data is received. If a handler is defined with
X.on('data', function(data) { ... })
then it will be called, otherwise data
will be stored in an internal buffer, where it can be retrieved with X.read()
event httpCRs.error ⇒
Call type:
httpCRs.on('error', function() { ... });
Description
An event that is fired if there is an error receiving the response. The error
event function receives an error object as parameter with a code
field and a
message
field. After the error event the close even will also be triggered to
conclude the HTTP request/response.
property httpCRs.headers ⇒
Call type:
property httpCRs.headers
Returns
An object mapping header name to value
Description
The headers received along with the HTTP response
property httpCRs.httpVersion ⇒
Call type:
property httpCRs.httpVersion
Returns
Th
Description
The HTTP version reported back by the server - usually "1.1"
function httpCRs.pipe ⇒
Call type:
function httpCRs.pipe(destination, options)
Parameters
destination
- The destination file/stream that will receive content from the source.
options
- [optional] An object { chunkSize : int=32, end : bool=true, complete : function }
chunkSize : The amount of data to pipe from source to destination at a time
complete : a function to call when the pipe activity is complete
end : call the 'end' function on the destination when the source is finished
Description
Pipe this to a stream (an object with a 'write' method)
Note: This is not available in devices with low flash memory
function httpCRs.read ⇒
Call type:
function httpCRs.read(chars)
Parameters
chars
- The number of characters to read, or undefined/0 for all available
Returns
A string containing the required bytes.
Description
Return a string containing characters that have been received
property httpCRs.statusCode ⇒
Call type:
property httpCRs.statusCode
Returns
The status code as a String
Description
The HTTP response's status code - usually "200"
if all went well
property httpCRs.statusMessage ⇒
Call type:
property httpCRs.statusMessage
Returns
An String Status Message
Description
The HTTP response's status message - Usually "OK"
if all went well
httpSRq Class
The HTTP server request
Methods and Fields
- function httpSRq.available()
- event httpSRq.close()
- event httpSRq.data(data)
- property httpSRq.headers
- property httpSRq.method
- function httpSRq.pipe(destination, options)
- function httpSRq.read(chars)
- property httpSRq.url
function httpSRq.available ⇒
Call type:
function httpSRq.available()
Returns
How many bytes are available
Description
Return how many bytes are available to read. If there is already a listener for data, this will always return 0.
event httpSRq.close ⇒
Call type:
httpSRq.on('close', function() { ... });
Description
Called when the connection closes.
event httpSRq.data ⇒
Call type:
httpSRq.on('data', function(data) { ... });
Parameters
data
- A string containing one or more characters of received data
Description
The 'data' event is called when data is received. If a handler is defined with
X.on('data', function(data) { ... })
then it will be called, otherwise data
will be stored in an internal buffer, where it can be retrieved with X.read()
property httpSRq.headers ⇒
Call type:
property httpSRq.headers
Returns
An object mapping header name to value
Description
The headers to sent to the server with this HTTP request.
property httpSRq.method ⇒
Call type:
property httpSRq.method
Returns
A string
Description
The HTTP method used with this request. Often "GET"
.
function httpSRq.pipe ⇒
Call type:
function httpSRq.pipe(destination, options)
Parameters
destination
- The destination file/stream that will receive content from the source.
options
- [optional] An object { chunkSize : int=32, end : bool=true, complete : function }
chunkSize : The amount of data to pipe from source to destination at a time
complete : a function to call when the pipe activity is complete
end : call the 'end' function on the destination when the source is finished
Description
Pipe this to a stream (an object with a 'write' method)
Note: This is not available in devices with low flash memory
function httpSRq.read ⇒
Call type:
function httpSRq.read(chars)
Parameters
chars
- The number of characters to read, or undefined/0 for all available
Returns
A string containing the required bytes.
Description
Return a string containing characters that have been received
property httpSRq.url ⇒
Call type:
property httpSRq.url
Returns
A string representing the URL
Description
The URL requested in this HTTP request, for instance:
"/"
- the main page"/favicon.ico"
- the web page's icon
httpSRs Class
The HTTP server response
Methods and Fields
- event httpSRs.close()
- event httpSRs.drain()
- function httpSRs.end(data)
- property httpSRs.headers
- function httpSRs.setHeader(name, value)
- function httpSRs.write(data)
- function httpSRs.writeHead(statusCode, headers)
event httpSRs.close ⇒
Call type:
httpSRs.on('close', function() { ... });
Description
Called when the connection closes.
event httpSRs.drain ⇒
Call type:
httpSRs.on('drain', function() { ... });
Description
An event that is fired when the buffer is empty and it can accept more data to send.
function httpSRs.end ⇒
Call type:
function httpSRs.end(data)
Parameters
data
- A string containing data to send
Description
See Socket.write
for more information about the data argument
property httpSRs.headers ⇒
Call type:
property httpSRs.headers
Returns
An object mapping header name to value
Description
The headers to send back along with the HTTP response.
The default contents are:
{
"Connection": "close"
}
function httpSRs.setHeader ⇒
Call type:
function httpSRs.setHeader(name, value)
Parameters
name
- The name of the header as a String
value
- The value of the header as a String
Description
Set a value to send in the header of this HTTP response. This updates the
httpSRs.headers
property.
Any headers supplied to writeHead
will overwrite any headers with the same
name.
function httpSRs.write ⇒
Call type:
function httpSRs.write(data)
Parameters
data
- A string containing data to send
Returns
For node.js compatibility, returns the boolean false. When the send buffer is empty, a drain
event will be sent
Description
This function writes the data
argument as a string. Data that is passed in
(including arrays) will be converted to a string with the normal JavaScript
toString
method. For more information about sending binary data see
Socket.write
function httpSRs.writeHead ⇒
Call type:
function httpSRs.writeHead(statusCode, headers)
Parameters
statusCode
- The HTTP status code
headers
- An object containing the headers
Description
Send the given status code and headers. If not explicitly called this will be done automatically the first time data is written to the response.
This cannot be called twice, or after data has already been sent in the response.
httpSrv Class
The HTTP server created by require('http').createServer
Methods and Fields
function httpSrv.close ⇒
Call type:
function httpSrv.close()
Description
Stop listening for new HTTP connections
function httpSrv.listen ⇒
Call type:
function httpSrv.listen(port)
Parameters
port
- The port to listen on
Returns
The HTTP server instance that 'listen' was called on
Description
Start listening for new HTTP connections on the given port
I2C Class
This class allows use of the built-in I2C ports. Currently it allows I2C Master mode only.
All addresses are in 7 bit format. If you have an 8 bit address then you need to shift it one bit to the right.
Instances
Methods and Fields
- I2C.find(pin)
- constructor I2C()
- function I2C.readFrom(address, quantity)
- function I2C.readReg(address, reg, quantity)
- function I2C.setup(options)
- function I2C.writeTo(address, data, ...)
I2C.find ⇒
Call type:
I2C.find(pin)
Parameters
pin
- A pin to search with
Returns
An object of type I2C
, or undefined
if one couldn't be found.
Description
Try and find an I2C hardware device that will work on this pin (e.g. I2C1
)
May return undefined if no device can be found.
constructor I2C ⇒
Call type:
new I2C()
Returns
An I2C object
Description
Create a software I2C port. This has limited functionality (no baud rate), but it can work on any pins.
Use I2C.setup
to configure this port.
function I2C.readFrom ⇒
Call type:
function I2C.readFrom(address, quantity)
Parameters
address
- The 7 bit address of the device to request bytes from, or an object of the form {address:12, stop:false}
to send this data without a STOP signal.
quantity
- The number of bytes to request
Returns
The data that was returned - as a Uint8Array
Description
Request bytes from the given slave device, and return them as a Uint8Array
(packed array of bytes). This is like using Arduino Wire's requestFrom,
available and read functions. Sends a STOP unless {address:X, stop:false}
is used.
function I2C.readReg ⇒
Call type:
function I2C.readReg(address, reg, quantity)
Parameters
address
- The 7 bit address of the device to request bytes from
reg
- The register on the device to read bytes from
quantity
- The number of bytes to request
Returns
The data that was returned - as a Uint8Array
Description
Request bytes from a register on the given I2C slave device, and return them as a Uint8Array (packed array of bytes).
This is the same as calling I2C.writeTo
and I2C.readFrom
:
I2C.readReg = function(address, reg, quantity) {
this.writeTo({address:address, stop:false}, reg);
return this.readFrom(address, quantity);
};
function I2C.setup ⇒
Call type:
function I2C.setup(options)
Parameters
options
- [optional] A structure containing extra information on initialising the I2C port{scl:pin, sda:pin, bitrate:100000}
You can find out which pins to use by looking at your board's reference page and searching for pins with the I2C
marker. Note that 400kHz is the maximum bitrate for most parts.
Description
Set up this I2C port
If not specified in options, the default pins are used (usually the lowest numbered pins on the lowest port that supports this peripheral)
function I2C.writeTo ⇒
Call type:
function I2C.writeTo(address, data, ...)
Parameters
address
- The 7 bit address of the device to transmit to, or an object of the form {address:12, stop:false}
to send this data without a STOP signal.
data, ...
- One or more items to write. May be ints, strings, arrays, or special objects (see E.toUint8Array
for more info).
Description
Transmit to the slave device with the given address. This is like Arduino's beginTransmission, write, and endTransmission rolled up into one.
Int16Array Class
This is the built-in JavaScript class for a typed array of 16 bit signed integers.
Instantiate this in order to efficiently store arrays of data (Espruino's normal arrays store data in a map, which is inefficient for non-sparse arrays).
Arrays of this type include all the methods from ArrayBufferView
Methods and Fields
constructor Int16Array ⇒
Call type:
new Int16Array(arr, byteOffset, length)
Parameters
arr
- The array or typed array to base this off, or an integer which is the array length
byteOffset
- The byte offset in the ArrayBuffer (ONLY IF the first argument was an ArrayBuffer)
length
- The length (ONLY IF the first argument was an ArrayBuffer)
Returns
A typed array
Description
Create a typed array based on the given input. Either an existing Array Buffer,
an Integer as a Length, or a simple array. If an ArrayBufferView
(e.g.
Uint8Array
rather than ArrayBuffer
) is given, it will be completely copied
rather than referenced.
Int32Array Class
This is the built-in JavaScript class for a typed array of 32 bit signed integers.
Instantiate this in order to efficiently store arrays of data (Espruino's normal arrays store data in a map, which is inefficient for non-sparse arrays).
Arrays of this type include all the methods from ArrayBufferView
Methods and Fields
constructor Int32Array ⇒
Call type:
new Int32Array(arr, byteOffset, length)
Parameters
arr
- The array or typed array to base this off, or an integer which is the array length
byteOffset
- The byte offset in the ArrayBuffer (ONLY IF the first argument was an ArrayBuffer)
length
- The length (ONLY IF the first argument was an ArrayBuffer)
Returns
A typed array
Description
Create a typed array based on the given input. Either an existing Array Buffer,
an Integer as a Length, or a simple array. If an ArrayBufferView
(e.g.
Uint8Array
rather than ArrayBuffer
) is given, it will be completely copied
rather than referenced.
Int8Array Class
This is the built-in JavaScript class for a typed array of 8 bit signed integers.
Instantiate this in order to efficiently store arrays of data (Espruino's normal arrays store data in a map, which is inefficient for non-sparse arrays).
Arrays of this type include all the methods from ArrayBufferView
Methods and Fields
constructor Int8Array ⇒
Call type:
new Int8Array(arr, byteOffset, length)
Parameters
arr
- The array or typed array to base this off, or an integer which is the array length
byteOffset
- The byte offset in the ArrayBuffer (ONLY IF the first argument was an ArrayBuffer)
length
- The length (ONLY IF the first argument was an ArrayBuffer)
Returns
A typed array
Description
Create a typed array based on the given input. Either an existing Array Buffer,
an Integer as a Length, or a simple array. If an ArrayBufferView
(e.g.
Uint8Array
rather than ArrayBuffer
) is given, it will be completely copied
rather than referenced.
InternalError Class
The base class for internal errors
Methods and Fields
constructor InternalError ⇒
Call type:
new InternalError(message)
Parameters
message
- [optional] An message string
Returns
An InternalError object
Description
Creates an InternalError object
function InternalError.toString ⇒
Call type:
function InternalError.toString()
Returns
A String
Jolt Class
Class containing utility functions for the Jolt.js Smart Bluetooth driver
Methods and Fields
Jolt.Q0 ⇒
Call type:
Jolt.Q0
Returns
An object containing the pins for the Q0 connector on Jolt.js {sda,scl,fet}
Description
Q0
and Q1
Qwiic connectors can have their power controlled by a 500mA FET connected to GND.
The sda
and scl
pins on this port are also analog inputs - use analogRead(Jolt.Q0.sda)
/etc
To turn this connector on run Jolt.Q0.setPower(1)
Jolt.Q1 ⇒
Call type:
Jolt.Q1
Returns
An object containing the pins for the Q1 connector on Jolt.js {sda,scl,fet}
Description
Q0
and Q1
Qwiic connectors can have their power controlled by a 500mA FET connected to GND.
The sda
and scl
pins on this port are also analog inputs - use analogRead(Jolt.Q1.sda)
/etc
To turn this connector on run Jolt.Q1.setPower(1)
Jolt.Q2 ⇒
Call type:
Jolt.Q2
Returns
An object containing the pins for the Q2 connector on Jolt.js {sda,scl,gnd,vcc}
Description
Q2
and Q3
have all 4 pins connected to Jolt.js's GPIO (including those usually used for power).
As such only around 8mA of power can be supplied to any connected device.
To use this as a normal Qwiic connector, run Jolt.Q2.setPower(1)
Jolt.Q3 ⇒
Call type:
Jolt.Q3
Returns
An object containing the pins for the Q3 connector on Jolt.js {sda,scl,gnd,vcc}
Description
Q2
and Q3
have all 4 pins connected to Jolt.js's GPIO (including those usually used for power).
As such only around 8mA of power can be supplied to any connected device.
To use this as a normal Qwiic connector, run Jolt.Q3.setPower(1)
Jolt.selfTest ⇒
Call type:
Jolt.selfTest()
Returns
True if the self-test passed
Description
Run a self-test, and return true for a pass. This checks for shorts between pins, so your Jolt shouldn't have anything connected to it.
Note: This self-test auto starts if you hold the button on your Jolt down while inserting the battery, leave it pressed for 3 seconds (while the green LED is lit) and release it soon after all LEDs turn on. 5 red blinks is a fail, 5 green is a pass.
If the self test fails, it'll set the Jolt.js Bluetooth advertising name to
Jolt.js !ERR
where ERR is a 3 letter error code.
Jolt.setDriverMode ⇒
Call type:
Jolt.setDriverMode(driver, mode)
Parameters
driver
- The number of the motor driver (0 or 1)
mode
- The mode of the motor driver (see below)
Description
Sets the mode of the motor drivers. Jolt.js has two motor drivers,
one (0
) for outputs 0..3, and one (1
) for outputs 4..7. They
can be controlled independently.
Mode can be:
undefined
/false
/"off"
- the motor driver is off, all motor driver pins are open circuittrue
/"output"
- [recommended] driver is set to "Independent bridge" mode. All 4 outputs are enabled and are either"motor"
- driver is set to "4 pin interface" mode where pins are paired up (V0+V1, V2+V3, etc). If both in a pair are 0 the output is open circuit (motor coast), if both are 1 both otputs are 0 (motor brake), and if both are different, those values are on the output:
output
mode:
V0 | V1 | Out 0 | Out 1 |
---|---|---|---|
0 | 0 | Low | Low |
0 | 1 | Low | High |
1 | 0 | High | Low |
1 | 1 | High | High |
motor
mode
V0 | V1 | Out 0 | Out 1 |
---|---|---|---|
0 | 0 | Open | Open |
0 | 1 | Low | High |
1 | 0 | High | Low |
1 | 1 | Low | Low |
JSON Class
An Object that handles conversion to and from the JSON data interchange format
Methods and Fields
JSON.parse ⇒
Call type:
JSON.parse(string)
Parameters
string
- A JSON string
Returns
The JavaScript object created by parsing the data string
Description
Parse the given JSON string into a JavaScript object
NOTE: This implementation uses eval() internally, and as such it is unsafe as it can allow arbitrary JS commands to be executed.
JSON.stringify ⇒
Call type:
JSON.stringify(data, replacer, space)
Parameters
data
- The data to be converted to a JSON string
replacer
- This value is ignored
space
- The number of spaces to use for padding, a string, or null/undefined for no whitespace
Returns
A JSON string
Description
Convert the given object into a JSON string which can subsequently be parsed with JSON.parse or eval.
Note: This differs from JavaScript's standard JSON.stringify
in that:
- The
replacer
argument is ignored - Typed arrays like
new Uint8Array(5)
will be dumped as if they were arrays, not as if they were objects (since it is more compact)
Math Class
This is a standard JavaScript class that contains useful Maths routines
Methods and Fields
- Math.abs(x)
- Math.acos(x)
- Math.asin(x)
- Math.atan(x)
- Math.atan2(y, x)
- Math.ceil(x)
- Math.clip(x, min, max)
- Math.cos(theta)
- Math.E
- Math.exp(x)
- Math.floor(x)
- Math.LN10
- Math.LN2
- Math.log(x)
- Math.LOG10E
- Math.LOG2E
- Math.max(args, ...)
- Math.min(args, ...)
- Math.PI
- Math.pow(x, y)
- Math.random()
- Math.round(x)
- Math.sign(x)
- Math.sin(theta)
- Math.sqrt(x)
- Math.SQRT1_2
- Math.SQRT2
- Math.tan(theta)
- Math.wrap(x, max)
Math.abs ⇒
Call type:
Math.abs(x)
Parameters
x
- A floating point value
Returns
The absolute value of x (eg, Math.abs(2)==2
, but also Math.abs(-2)==2
)
Math.acos ⇒
Call type:
Math.acos(x)
Parameters
x
- The value to get the arc cosine of
Returns
The arc cosine of x, between 0 and PI
Math.asin ⇒
Call type:
Math.asin(x)
Parameters
x
- The value to get the arc sine of
Returns
The arc sine of x, between -PI/2 and PI/2
Math.atan ⇒
Call type:
Math.atan(x)
Parameters
x
- The value to get the arc tangent of
Returns
The arc tangent of x, between -PI/2 and PI/2
Math.atan2 ⇒
Call type:
Math.atan2(y, x)
Parameters
y
- The Y-part of the angle to get the arc tangent of
x
- The X-part of the angle to get the arc tangent of
Returns
The arctangent of Y/X, between -PI and PI
Math.ceil ⇒
Call type:
Math.ceil(x)
Parameters
x
- The value to round up
Returns
x, rounded upwards to the nearest integer
Math.clip ⇒
Call type:
Math.clip(x, min, max)
Parameters
x
- A floating point value to clip
min
- The smallest the value should be
max
- The largest the value should be
Returns
The value of x, clipped so as not to be below min or above max.
Description
DEPRECATED - Please use E.clip()
instead. Clip a number to be between min and
max (inclusive)
Note: This is not available in devices with low flash memory
Math.cos ⇒
Call type:
Math.cos(theta)
Parameters
theta
- The angle to get the cosine of
Returns
The cosine of theta
Math.E ⇒
Call type:
Math.E
Returns
The value of E - 2.718281828459045
Math.exp ⇒
Call type:
Math.exp(x)
Parameters
x
- The value raise E to the power of
Returns
E^x
Math.floor ⇒
Call type:
Math.floor(x)
Parameters
x
- The value to round down
Returns
x, rounded downwards to the nearest integer
Math.LN10 ⇒
Call type:
Math.LN10
Returns
The natural logarithm of 10 - 2.302585092994046
Math.LN2 ⇒
Call type:
Math.LN2
Returns
The natural logarithm of 2 - 0.6931471805599453
Math.log ⇒
Call type:
Math.log(x)
Parameters
x
- The value to take the logarithm (base E) root of
Returns
The log (base E) of x
Math.LOG10E ⇒
Call type:
Math.LOG10E
Returns
The base 10 logarithm of e - 0.4342944819032518
Math.LOG2E ⇒
Call type:
Math.LOG2E
Returns
The base 2 logarithm of e - 1.4426950408889634
Math.max ⇒
Call type:
Math.max(args, ...)
Parameters
args, ...
- Floating point values to clip
Returns
The maximum of the supplied values
Description
Find the maximum of a series of numbers
Math.min ⇒
Call type:
Math.min(args, ...)
Parameters
args, ...
- Floating point values to clip
Returns
The minimum of the supplied values
Description
Find the minimum of a series of numbers
Math.PI ⇒
Call type:
Math.PI
Returns
The value of PI - 3.141592653589793
Math.pow ⇒
Call type:
Math.pow(x, y)
Parameters
x
- The value to raise to the power
y
- The power x should be raised to
Returns
x raised to the power y (x^y)
Math.random ⇒
Call type:
Math.random()
Returns
A random number between 0 and 1
Math.round ⇒
Call type:
Math.round(x)
Parameters
x
- The value to round
Returns
x, rounded to the nearest integer
Math.sign ⇒
Call type:
Math.sign(x)
Parameters
x
- The value to get the sign from
Returns
sign on x - -1, 1, or 0
Math.sin ⇒
Call type:
Math.sin(theta)
Parameters
theta
- The angle to get the sine of
Returns
The sine of theta
Math.sqrt ⇒
Call type:
Math.sqrt(x)
Parameters
x
- The value to take the square root of
Returns
The square root of x
Math.SQRT1_2 ⇒
Call type:
Math.SQRT1_2
Returns
The square root of 1/2 - 0.7071067811865476
Math.SQRT2 ⇒
Call type:
Math.SQRT2
Returns
The square root of 2 - 1.4142135623730951
Math.tan ⇒
Call type:
Math.tan(theta)
Parameters
theta
- The angle to get the tangent of
Returns
The tangent of theta
Math.wrap ⇒
Call type:
Math.wrap(x, max)
Parameters
x
- A floating point value to wrap
max
- The largest the value should be
Returns
The value of x, wrapped so as not to be below min or above max.
Description
DEPRECATED - This is not part of standard JavaScript libraries
Wrap a number around if it is less than 0 or greater than or equal to max. For
instance you might do: Math.wrap(angleInDegrees, 360)
Note: This is not available in devices with low flash memory
Microbit Class
Class containing micro:bit's utility functions.
Methods and Fields
- Microbit.accel()
- Microbit.accelOff()
- Microbit.accelOn()
- Microbit.accelWr(addr, data)
- event Microbit.gesture(gesture)
- Microbit.mag()
- Microbit.MIC
- Microbit.MIC_ENABLE
- Microbit.play(waveform, samplesPerSecond, callback)
- Microbit.record(samplesPerSecond, callback, samples)
- Microbit.SPEAKER
Microbit.accel ⇒
Call type:
Microbit.accel()
Returns
An Object {x,y,z}
of acceleration readings in G
Microbit.accelOff ⇒
Call type:
Microbit.accelOff()
Description
Turn off events from the accelerometer (started with Microbit.accelOn
)
Note: This is only available in BBC micro:bit v2 boards
Microbit.accelOn ⇒
Call type:
Microbit.accelOn()
Description
Turn on the accelerometer, and create Microbit.accel
and Microbit.gesture
events.
Note: The accelerometer is currently always enabled - this code just responds to interrupts and reads
Note: This is only available in BBC micro:bit v2 boards
Microbit.accelWr ⇒
Call type:
Microbit.accelWr(addr, data)
Parameters
addr
- Accelerometer address
data
- Data to write
Description
Note: This function is only available on the BBC micro:bit board
Write the given value to the accelerometer
Note: This is only available in BBC micro:bit v2 boards
event Microbit.gesture ⇒
Call type:
Microbit.on('gesture', function(gesture) { ... });
Parameters
gesture
- An Int8Array containing the accelerations (X,Y,Z) from the last gesture detected by the accelerometer
Description
Called when the Micro:bit is moved in a deliberate fashion, and includes data on the detected gesture.
Note: This is only available in BBC micro:bit v2 boards
Microbit.mag ⇒
Call type:
Microbit.mag()
Returns
An Object {x,y,z}
of magnetometer readings as integers
Microbit.MIC ⇒
Call type:
Microbit.MIC
Returns
See description above
Description
The micro:bit's microphone pin
MIC_ENABLE
should be set to 1 before using this
Note: This is only available in BBC micro:bit v2 boards
Microbit.MIC_ENABLE ⇒
Call type:
Microbit.MIC_ENABLE
Returns
See description above
Description
The micro:bit's microphone enable pin
Note: This is only available in BBC micro:bit v2 boards
Microbit.play ⇒
Call type:
Microbit.play(waveform, samplesPerSecond, callback)
Parameters
waveform
- An array of data to play (unsigned 8 bit)
samplesPerSecond
- The number of samples per second for playback default is 4000
callback
- A function to call when playback is finished
Description
Play a waveform on the Micro:bit's speaker
Note: This is only available in BBC micro:bit v2 boards
Microbit.record ⇒
Call type:
Microbit.record(samplesPerSecond, callback, samples)
Parameters
samplesPerSecond
- The number of samples per second for recording - 4000 is recommended
callback
- A function to call with the result of recording (unsigned 8 bit ArrayBuffer)
samples
- [optional] How many samples to record (6000 default)
Description
Records sound from the micro:bit's onboard microphone and returns the result
Note: This is only available in BBC micro:bit v2 boards
Microbit.SPEAKER ⇒
Call type:
Microbit.SPEAKER
Returns
See description above
Description
The micro:bit's speaker pin
Note: This is only available in BBC micro:bit v2 boards
Modules Class
Built-in class that caches the modules used by the require
command
Methods and Fields
- Modules.addCached(id, sourcecode)
- Modules.getCached()
- Modules.removeAllCached()
- Modules.removeCached(id)
Modules.addCached ⇒
Call type:
Modules.addCached(id, sourcecode)
Parameters
id
- The module name to add
sourcecode
- The module's sourcecode
Description
Add the given module to the cache
Modules.getCached ⇒
Call type:
Modules.getCached()
Returns
An array of module names
Description
Return an array of module names that have been cached
Modules.removeAllCached ⇒
Call type:
Modules.removeAllCached()
Description
Remove all cached modules
Modules.removeCached ⇒
Call type:
Modules.removeCached(id)
Parameters
id
- The module name to remove
Description
Remove the given module from the list of cached modules
neopixel Library
This library allows you to write to Neopixel/WS281x/APA10x/SK6812 LED strips
These use a high speed single-wire protocol which needs platform-specific implementation on some devices - hence this library to simplify things.
Methods and Fields
neopixel.write ⇒
Call type:
require("neopixel").write(pin, data)
Parameters
pin
- The Pin the LEDs are connected to
data
- The data to write to the LED strip (must be a multiple of 3 bytes long)
Description
Write to a strip of NeoPixel/WS281x/APA104/APA106/SK6812-style LEDs attached to the given pin.
// set just one pixel, red, green, blue
require("neopixel").write(B15, [255,0,0]);
// Produce an animated rainbow over 25 LEDs
var rgb = new Uint8ClampedArray(25*3);
var pos = 0;
function getPattern() {
pos++;
for (var i=0;i<rgb.length;) {
rgb[i++] = (1 + Math.sin((i+pos)*0.1324)) * 127;
rgb[i++] = (1 + Math.sin((i+pos)*0.1654)) * 127;
rgb[i++] = (1 + Math.sin((i+pos)*0.1)) * 127;
}
return rgb;
}
setInterval(function() {
require("neopixel").write(B15, getPattern());
}, 100);
Note:
Different types of LED have the data in different orders - so don't be surprised by RGB or BGR orderings!
Some LED strips (SK6812) actually take 4 bytes per LED (red, green, blue and white). These are still supported but the array of data supplied must still be a multiple of 3 bytes long. Just round the size up - it won't cause any problems.
On some platforms like STM32, pins capable of hardware SPI MOSI are required.
On STM32,
neopixel.write
chooses a hardware SPI device to output the signal on and uses that. However in order to avoid spikes in the output, if that hardware device is already initialised it will not be re-initialised. This means that if the SPI device was already in use, you may have to useSPIx.setup({baud:3200000, mosi:the_pin})
to force it to be re-setup on the pin.Espruino devices tend to have 3.3v IO, while WS2812/etc run off of 5v. Many WS2812 will only register a logic '1' at 70% of their input voltage - so if powering them off 5v you will not be able to send them data reliably. You can work around this by powering the LEDs off a lower voltage (for example 3.7v from a LiPo battery), can put the output into the
af_opendrain
state and use a pullup resistor to 5v on STM32 based boards (nRF52 are not 5v tolerant so you can't do this), or can use a level shifter to shift the voltage up into the 5v range.
net Library
This library allows you to create TCPIP servers and clients
In order to use this, you will need an extra module to get network connectivity.
This is designed to be a cut-down version of the node.js library. Please see the Internet page for more information on how to use it.
Methods and Fields
net.connect ⇒
Call type:
require("net").connect(options, callback)
Parameters
options
- An object containing host,port fields
callback
- A function(sckt)
that will be called with the socket when a connection is made. You can then call sckt.write(...)
to send data, and sckt.on('data', function(data) { ... })
and sckt.on('close', function() { ... })
to deal with the response.
Returns
Returns a new net.Socket object
Description
Create a TCP socket connection
net.createServer ⇒
Call type:
require("net").createServer(callback)
Parameters
callback
- A function(connection)
that will be called when a connection is made
Returns
Returns a new Server Object
Description
Create a Server
When a request to the server is made, the callback is called. In the callback
you can use the methods on the connection to send data. You can also add
connection.on('data',function() { ... })
to listen for received data
NetworkJS Library
Library that initialises a network device that calls into JavaScript
Methods and Fields
NetworkJS.create ⇒
Call type:
require("NetworkJS").create(obj)
Parameters
obj
- An object containing functions to access the network device
Returns
The object passed in
Description
Initialise the network using the callbacks given and return the first argument. For instance:
require("NetworkJS").create({
create : function(host, port, socketType, options) {
// Create a socket and return its index, host is a string, port is an integer.
// If host isn't defined, create a server socket
console.log("Create",host,port);
return 1;
},
close : function(sckt) {
// Close the socket. returns nothing
},
accept : function(sckt) {
// Accept the connection on the server socket. Returns socket number or -1 if no connection
return -1;
},
recv : function(sckt, maxLen, socketType) {
// Receive data. Returns a string (even if empty).
// If non-string returned, socket is then closed
return null;//or "";
},
send : function(sckt, data, socketType) {
// Send data (as string). Returns the number of bytes sent - 0 is ok.
// Less than 0
return data.length;
}
});
socketType
is an integer - 2 for UDP, or see SocketType in
https://github.com/espruino/Espruino/blob/master/libs/network/network.h for more
information.
NodeMCU Class
This is a built-in class to allow you to use the ESP8266 NodeMCU boards' pin namings to access pins. It is only available on ESP8266-based boards.
Methods and Fields
- NodeMCU.A0
- NodeMCU.D0
- NodeMCU.D1
- NodeMCU.D10
- NodeMCU.D2
- NodeMCU.D3
- NodeMCU.D4
- NodeMCU.D5
- NodeMCU.D6
- NodeMCU.D7
- NodeMCU.D8
- NodeMCU.D9
NodeMCU.A0 ⇒
Call type:
NodeMCU.A0
Returns
A Pin
NodeMCU.D0 ⇒
Call type:
NodeMCU.D0
Returns
A Pin
NodeMCU.D1 ⇒
Call type:
NodeMCU.D1
Returns
A Pin
NodeMCU.D10 ⇒
Call type:
NodeMCU.D10
Returns
A Pin
NodeMCU.D2 ⇒
Call type:
NodeMCU.D2
Returns
A Pin
NodeMCU.D3 ⇒
Call type:
NodeMCU.D3
Returns
A Pin
NodeMCU.D4 ⇒
Call type:
NodeMCU.D4
Returns
A Pin
NodeMCU.D5 ⇒
Call type:
NodeMCU.D5
Returns
A Pin
NodeMCU.D6 ⇒
Call type:
NodeMCU.D6
Returns
A Pin
NodeMCU.D7 ⇒
Call type:
NodeMCU.D7
Returns
A Pin
NodeMCU.D8 ⇒
Call type:
NodeMCU.D8
Returns
A Pin
NodeMCU.D9 ⇒
Call type:
NodeMCU.D9
Returns
A Pin
NRF Class
The NRF class is for controlling functionality of the Nordic nRF51/nRF52 chips.
Most functionality is related to Bluetooth Low Energy, however there are also some functions related to NFC that apply to NRF52-based devices.
Methods and Fields
- event NRF.advertising(isAdvertising)
- NRF.amsCommand(id)
- NRF.amsGetPlayerInfo(id)
- NRF.amsGetTrackInfo(id)
- NRF.amsIsActive()
- NRF.ancsAction(uid, positive)
- NRF.ancsGetAppInfo(id)
- NRF.ancsGetNotificationInfo(uid)
- NRF.ancsIsActive()
- event NRF.bond(status)
- event NRF.characteristicsDiscover()
- event NRF.connect(addr)
- NRF.connect(mac, options)
- event NRF.CTS(info)
- NRF.ctsGetTime()
- NRF.ctsIsActive()
- event NRF.disconnect(reason)
- NRF.disconnect()
- NRF.eraseBonds(callback)
- event NRF.error(msg)
- NRF.filterDevices(devices, filters)
- NRF.findDevices(callback, options)
- NRF.getAddress()
- NRF.getAdvertisingData(data, options)
- NRF.getBattery()
- NRF.getSecurityStatus()
- event NRF.HID()
- NRF.nfcAndroidApp(app)
- event NRF.NFCoff()
- event NRF.NFCon()
- NRF.nfcPair(key)
- NRF.nfcRaw(payload)
- event NRF.NFCrx(arr)
- NRF.nfcSend(payload)
- NRF.nfcStart(payload)
- NRF.nfcStop()
- NRF.nfcURL(url)
- event NRF.passkey(passkey)
- NRF.requestDevice(options)
- NRF.resolveAddress(options)
- NRF.restart(callback)
- event NRF.security(status)
- NRF.sendHIDReport(data, callback)
- event NRF.servicesDiscover()
- NRF.setAddress(addr)
- NRF.setAdvertising(data, options)
- NRF.setConnectionInterval(interval)
- NRF.setLowPowerConnection(lowPower)
- NRF.setRSSIHandler(callback)
- NRF.setScan(callback, options)
- NRF.setScanResponse(data)
- NRF.setSecurity(options)
- NRF.setServices(data, options)
- NRF.setTxPower(power)
- NRF.setWhitelist(whitelisting)
- NRF.sleep()
- NRF.startBonding(forceRepair)
- NRF.updateServices(data)
- NRF.wake()
event NRF.advertising ⇒
Call type:
NRF.on('advertising', function(isAdvertising) { ... });
Parameters
isAdvertising
- Whether we are advertising or not
Description
Called when Bluetooth advertising starts or stops on Espruino
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
NRF.amsCommand ⇒
Call type:
NRF.amsCommand(id)
Parameters
id
- For example, 'play', 'pause', 'volup' or 'voldown'
Description
Send an AMS command to an Apple Media Service device to control music playback
Command is one of play, pause, playpause, next, prev, volup, voldown, repeat, shuffle, skipforward, skipback, like, dislike, bookmark
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
NRF.amsGetPlayerInfo ⇒
Call type:
NRF.amsGetPlayerInfo(id)
Parameters
id
- Either 'name', 'playbackinfo' or 'volume'
Returns
A Promise
that is resolved (or rejected) when the connection is complete
Description
Get Apple Media Service (AMS) info for the current media player. "playbackinfo" returns a concatenation of three comma-separated values:
- PlaybackState: a string that represents the integer value of the playback
state:
- PlaybackStatePaused = 0
- PlaybackStatePlaying = 1
- PlaybackStateRewinding = 2
- PlaybackStateFastForwarding = 3
- PlaybackRate: a string that represents the floating point value of the playback rate.
- ElapsedTime: a string that represents the floating point value of the elapsed time of the current track, in seconds
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
NRF.amsGetTrackInfo ⇒
Call type:
NRF.amsGetTrackInfo(id)
Parameters
id
- Either 'artist', 'album', 'title' or 'duration'
Returns
A Promise
that is resolved (or rejected) when the connection is complete
Description
Get Apple Media Service (AMS) info for the currently-playing track
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
NRF.amsIsActive ⇒
Call type:
NRF.amsIsActive()
Parameters
Returns
True if Apple Media Service (AMS) has been initialised and is active
Description
Check if Apple Media Service (AMS) is currently active on the BLE connection
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
NRF.ancsAction ⇒
Call type:
NRF.ancsAction(uid, positive)
Parameters
uid
- The UID of the notification to respond to
positive
- true
for positive action, false
for negative
Description
Send an ANCS action for a specific Notification UID. Corresponds to posaction/negaction in the 'ANCS' event that was received
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
NRF.ancsGetAppInfo ⇒
Call type:
NRF.ancsGetAppInfo(id)
Parameters
id
- The app ID to get information for
Returns
A Promise
that is resolved (or rejected) when the connection is complete
Description
Get ANCS info for an app (app id is available via NRF.ancsGetNotificationInfo
)
Promise returns:
{
"uid" : int,
"appId" : string,
"title" : string,
"subtitle" : string,
"message" : string,
"messageSize" : string,
"date" : string,
"posAction" : string,
"negAction" : string,
"name" : string,
}
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
NRF.ancsGetNotificationInfo ⇒
Call type:
NRF.ancsGetNotificationInfo(uid)
Parameters
uid
- The UID of the notification to get information for
Returns
A Promise
that is resolved (or rejected) when the connection is complete
Description
Get ANCS info for a notification event received via E.ANCS
, e.g.:
E.on('ANCS', event => {
NRF.ancsGetNotificationInfo( event.uid ).then(a=>print("Notify",E.toJS(a)));
});
Returns:
{
"uid" : integer,
"appId": string,
"title": string,
"subtitle": string,
"message": string,
"messageSize": string,
"date": string,
"posAction": string,
"negAction": string
}
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
NRF.ancsIsActive ⇒
Call type:
NRF.ancsIsActive()
Parameters
Returns
True if Apple Notification Center Service (ANCS) has been initialised and is active
Description
Check if Apple Notification Center Service (ANCS) is currently active on the BLE connection
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
event NRF.bond ⇒
Call type:
NRF.on('bond', function(status) { ... });
Parameters
status
- One of 'request'/'start'/'success'/'fail'
Description
Called during the bonding process to update on status
status
is one of:
"request"
- Bonding has been requested in code viaNRF.startBonding
"start"
- The bonding procedure has started"success"
- The bonding procedure has succeeded (NRF.startBonding
's promise resolves)"fail"
- The bonding procedure has failed (NRF.startBonding
's promise rejects)
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
event NRF.characteristicsDiscover ⇒
Call type:
NRF.on('characteristicsDiscover', function() { ... });
Description
Called with discovered characteristics when discovery is finished
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) and ESP32 boards
event NRF.connect ⇒
Call type:
NRF.on('connect', function(addr) { ... });
Parameters
addr
- The address of the device that has connected
Description
Called when a host device connects to Espruino. The first argument contains the address.
NRF.connect ⇒
Call type:
NRF.connect(mac, options)
Parameters
mac
- The MAC address to connect to
options
- (Espruino-specific) An object of connection options (see BluetoothRemoteGATTServer.connect
for full details)
Returns
A Promise
that is resolved (or rejected) when the connection is complete
Description
Connect to a BLE device by MAC address. Returns a promise, the argument of which
is the BluetoothRemoteGATTServer
connection.
NRF.connect("aa:bb:cc:dd:ee").then(function(server) {
// ...
});
This has the same effect as calling BluetoothDevice.gatt.connect
on a
BluetoothDevice
requested using NRF.requestDevice
. It just allows you to
specify the address directly (without having to scan).
You can use it as follows - this would connect to another Puck device and turn its LED on:
var gatt;
NRF.connect("aa:bb:cc:dd:ee random").then(function(g) {
gatt = g;
return gatt.getPrimaryService("6e400001-b5a3-f393-e0a9-e50e24dcca9e");
}).then(function(service) {
return service.getCharacteristic("6e400002-b5a3-f393-e0a9-e50e24dcca9e");
}).then(function(characteristic) {
return characteristic.writeValue("LED1.set()\n");
}).then(function() {
gatt.disconnect();
console.log("Done!");
});
Note: Espruino Bluetooth devices use a type of BLE address known as 'random static', which is different to a 'public' address. To connect to an Espruino device you'll need to use an address string of the form
"aa:bb:cc:dd:ee
random"
rather than just "aa:bb:cc:dd:ee"
. If you scan for devices with
NRF.findDevices
/NRF.setScan
then addresses are already reported in the
correct format.
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) and ESP32 boards
event NRF.CTS ⇒
Call type:
NRF.on('CTS', function(info) { ... });
Parameters
info
- An object (see below)
Description
Returns time information from the Current Time Service
(if requested with NRF.ctsGetTime
and is activated by calling NRF.setServices(..., {..., cts:true})
)
{
date : // Date object with the current date
day : // if known, 0=sun,1=mon (matches JS `Date`)
reason : [ // reason for the date change
"external", // External time change
"manual", // Manual update
"timezone", // Timezone changed
"DST", // Daylight savings
]
timezone // if LTI characteristic exists, this is the timezone
dst // if LTI characteristic exists, this is the dst adjustment
}
For instance this can be used as follows to update Espruino's time:
E.on('CTS',e=>{
setTime(e.date.getTime()/1000);
});
NRF.ctsGetTime(); // also returns a promise with CTS info
Note: This is only available in Bangle.js smartwatches
NRF.ctsGetTime ⇒
Call type:
NRF.ctsGetTime()
Returns
A Promise
that is resolved (or rejected) when time is received
Description
Read the time from CTS - creates an NRF.on('CTS', ...)
event as well
NRF.ctsGetTime(); // also returns a promise
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
NRF.ctsIsActive ⇒
Call type:
NRF.ctsIsActive()
Parameters
Returns
True if Apple Current Time Service (CTS) has been initialised and is active
Description
Check if Apple Current Time Service (CTS) is currently active on the BLE connection
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
event NRF.disconnect ⇒
Call type:
NRF.on('disconnect', function(reason) { ... });
Parameters
reason
- The reason code reported back by the BLE stack - see Nordic's ble_hci.h
file for more information
Description
Called when a host device disconnects from Espruino.
The most common reason is:
* 19 - REMOTE_USER_TERMINATED_CONNECTION
* 22 - LOCAL_HOST_TERMINATED_CONNECTION
NRF.disconnect ⇒
Call type:
NRF.disconnect()
Description
If a device is connected to Espruino, disconnect from it.
NRF.eraseBonds ⇒
Call type:
NRF.eraseBonds(callback)
Parameters
callback
- [optional] A function to be called while the softdevice is uninitialised. Use with caution - accessing console/bluetooth will almost certainly result in a crash.
Description
Delete all data stored for all peers (bonding data used for secure connections). This cannot be done
while a connection is active, so if there is a connection it will be postponed until everything is disconnected
(which can be done by calling NRF.disconnect()
and waiting).
Booting your device while holding all buttons down together should also have the same effect.
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
event NRF.error ⇒
Call type:
NRF.on('error', function(msg) { ... });
Parameters
msg
- The error string
Description
Called when the Nordic Bluetooth stack (softdevice) generates an error. In pretty much all cases an Exception will also have been thrown.
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
NRF.filterDevices ⇒
Call type:
NRF.filterDevices(devices, filters)
Parameters
devices
- An array of BluetoothDevice
objects, from NRF.findDevices
or similar
filters
- A list of filters (as would be passed to NRF.requestDevice
) to filter devices by
Returns
An array of BluetoothDevice
objects that match the given filters
Description
This function can be used to quickly filter through Bluetooth devices.
For instance if you wish to scan for multiple different types of device at the
same time then you could use NRF.findDevices
with all the filters you're
interested in. When scanning is finished you can then use NRF.filterDevices
to
pick out just the devices of interest.
// the two types of device we're interested in
var filter1 = [{serviceData:{"fe95":{}}}];
var filter2 = [{namePrefix:"Pixl.js"}];
// the following filter will return both types of device
var allFilters = filter1.concat(filter2);
// now scan for both types of device, and filter them out afterwards
NRF.findDevices(function(devices) {
var devices1 = NRF.filterDevices(devices, filter1);
var devices2 = NRF.filterDevices(devices, filter2);
// ...
}, {filters : allFilters});
NRF.findDevices ⇒
Call type:
NRF.findDevices(callback, options)
Parameters
callback
- The callback to call with received advertising packets (as BluetoothDevice
), or undefined to stop
options
- [optional] A time in milliseconds to scan for (defaults to 2000), Or an optional object {filters: ..., timeout : ..., active: bool}
(as would be passed to NRF.requestDevice
) to filter devices by
Description
Utility function to return a list of BLE devices detected in range. Behind the
scenes, this uses NRF.setScan(...)
and collates the results.
NRF.findDevices(function(devices) {
console.log(devices);
}, 1000);
prints something like:
[
BluetoothDevice {
"id" : "e7:e0:57:ad:36:a2 random",
"rssi": -45,
"services": [ "4567" ],
"serviceData" : { "0123" : [ 1 ] },
"manufacturer" : 1424,
"manufacturerData" : new Uint8Array([ ... ]).buffer,
"data": new ArrayBuffer([ ... ]).buffer,
"name": "Puck.js 36a2"
},
BluetoothDevice {
"id": "c0:52:3f:50:42:c9 random",
"rssi": -65,
"data": new ArrayBuffer([ ... ]),
"name": "Puck.js 8f57"
}
]
For more information on the structure returned, see NRF.setScan
.
If you want to scan only for specific devices you can replace the timeout with
an object of the form {filters: ..., timeout : ..., active: bool}
using the
filters described in NRF.requestDevice
. For example to search for devices with
Espruino's manufacturerData
:
NRF.findDevices(function(devices) {
...
}, {timeout : 2000, filters : [{ manufacturerData:{0x0590:{}} }] });
You could then use
BluetoothDevice.gatt.connect(...)
on the device returned to make a connection.
You can also use NRF.connect(...)
on just the id
string returned, which may be useful if you always want to connect to a specific
device.
Note: Using findDevices turns the radio's receive mode on for 2000ms (or however long you specify). This can draw a lot of power (12mA or so), so you should use it sparingly or you can run your battery down quickly.
Note: The 'data' field contains the data of the last packet received.
There may have been more packets. To get data for each packet individually use
NRF.setScan
instead.
NRF.getAddress ⇒
Call type:
NRF.getAddress()
Returns
MAC address - a string of the form 'aa:bb:cc:dd:ee:ff'
Description
Get this device's default Bluetooth MAC address.
For Puck.js, the last 5 characters of this (e.g. ee:ff
) are used in the
device's advertised Bluetooth name.
NRF.getAdvertisingData ⇒
Call type:
NRF.getAdvertisingData(data, options)
Parameters
data
- The data to advertise as an object
options
- [optional] An object of options
Returns
An array containing the advertising data
Description
This is just like NRF.setAdvertising
, except instead of advertising the data,
it returns the packet that would be advertised as an array.
NRF.getBattery ⇒
Call type:
NRF.getBattery()
Returns
Battery level in volts
Description
Get the battery level in volts (the voltage that the NRF chip is running off of).
This is the battery level of the device itself - it has nothing to with any device that might be connected.
NRF.getSecurityStatus ⇒
Call type:
NRF.getSecurityStatus()
Returns
An object
Description
Return an object with information about the security state of the current peripheral connection:
{
connected // The connection is active (not disconnected).
encrypted // Communication on this link is encrypted.
mitm_protected // The encrypted communication is also protected against man-in-the-middle attacks.
bonded // The peer is bonded with us
advertising // Are we currently advertising?
connected_addr // If connected=true, the MAC address of the currently connected device
}
If there is no active connection, {connected:false}
will be returned.
See NRF.setSecurity
for information about negotiating a secure connection.
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
event NRF.HID ⇒
Call type:
NRF.on('HID', function() { ... });
Description
Called with a single byte value when Espruino is set up as a HID device and the computer it is connected to sends a HID report back to Espruino. This is usually used for handling indications such as the Caps Lock LED.
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
NRF.nfcAndroidApp ⇒
Call type:
NRF.nfcAndroidApp(app)
Parameters
app
- The unique identifier of the given Android App
Description
Enables NFC with a record that will launch the given android app.
For example:
NRF.nfcAndroidApp("no.nordicsemi.android.nrftoolbox")
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) with NFC (Puck.js, Pixl.js, MDBT42Q)
event NRF.NFCoff ⇒
Call type:
NRF.on('NFCoff', function() { ... });
Description
Called when an NFC field is no longer detected
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) with NFC (Puck.js, Pixl.js, MDBT42Q)
event NRF.NFCon ⇒
Call type:
NRF.on('NFCon', function() { ... });
Description
Called when an NFC field is detected
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) with NFC (Puck.js, Pixl.js, MDBT42Q)
NRF.nfcPair ⇒
Call type:
NRF.nfcPair(key)
Parameters
key
- 16 byte out of band key
Description
Enables NFC and with an out of band 16 byte pairing key.
For example the following will enable out of band pairing on BLE such that the device will pair when you tap the phone against it:
var bleKey = [0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF, 0x99, 0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11, 0x00];
NRF.on('security',s=>print("security",JSON.stringify(s)));
NRF.nfcPair(bleKey);
NRF.setSecurity({oob:bleKey, mitm:true});
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) with NFC (Puck.js, Pixl.js, MDBT42Q)
NRF.nfcRaw ⇒
Call type:
NRF.nfcRaw(payload)
Parameters
payload
- The NFC NDEF message to deliver to the reader
Description
Enables NFC and starts advertising with Raw data. For example:
NRF.nfcRaw(new Uint8Array([193, 1, 0, 0, 0, 13, 85, 3, 101, 115, 112, 114, 117, 105, 110, 111, 46, 99, 111, 109]));
// same as NRF.nfcURL("http://espruino.com");
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) with NFC (Puck.js, Pixl.js, MDBT42Q)
event NRF.NFCrx ⇒
Call type:
NRF.on('NFCrx', function(arr) { ... });
Parameters
arr
- An ArrayBuffer containign the received data
Description
When NFC is started with NRF.nfcStart
, this is fired when NFC data is
received. It doesn't get called if NFC is started with NRF.nfcURL
or
NRF.nfcRaw
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) with NFC (Puck.js, Pixl.js, MDBT42Q)
NRF.nfcSend ⇒
Call type:
NRF.nfcSend(payload)
Parameters
payload
- Optional tx data
Description
Advanced NFC Functionality. If you just want to advertise a URL, use
NRF.nfcURL
instead.
Acknowledges the last frame and optionally transmits a response. If payload is
an array, then a array.length byte nfc frame is sent. If payload is a int, then
a 4bit ACK/NACK is sent. Note: nfcSend
should always be called after
an NFCrx
event.
NRF.nfcSend(new Uint8Array([0x01, 0x02, ...]));
// or
NRF.nfcSend(0x0A);
// or
NRF.nfcSend();
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) with NFC (Puck.js, Pixl.js, MDBT42Q)
NRF.nfcStart ⇒
Call type:
NRF.nfcStart(payload)
Parameters
payload
- Optional 7 byte UID
Returns
Internal tag memory (first 10 bytes of tag data)
Description
Advanced NFC Functionality. If you just want to advertise a URL, use
NRF.nfcURL
instead.
Enables NFC and starts advertising. NFCrx
events will be fired when data is
received.
NRF.nfcStart();
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) with NFC (Puck.js, Pixl.js, MDBT42Q)
NRF.nfcStop ⇒
Call type:
NRF.nfcStop()
Parameters
Description
Advanced NFC Functionality. If you just want to advertise a URL, use
NRF.nfcURL
instead.
Disables NFC.
NRF.nfcStop();
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) with NFC (Puck.js, Pixl.js, MDBT42Q)
NRF.nfcURL ⇒
Call type:
NRF.nfcURL(url)
Parameters
url
- The URL string to expose on NFC, or undefined
to disable NFC
Description
Enables NFC and starts advertising the given URL. For example:
NRF.nfcURL("http://espruino.com");
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) with NFC (Puck.js, Pixl.js, MDBT42Q)
event NRF.passkey ⇒
Call type:
NRF.on('passkey', function(passkey) { ... });
Parameters
passkey
- A 6 character numeric String to be displayed
Description
(Added in 2v19) Called when a central device connects to Espruino, pairs, and sends a passkey that Espruino should display.
For this to be used, you'll have to specify that your device has a display using NRF.setSecurity({mitm:1, display:1});
For instance:
NRF.setSecurity({mitm:1, display:1});
NRF.on("passkey", key => print("Enter PIN: ",passkey));
It is also possible to specify a static passkey with NRF.setSecurity({passkey:"123456", mitm:1, display:1});
in which case no passkey
event handler is needed (this method works on Espruino 2v02 and later)
Note: A similar event, BluetoothDevice.on("passkey", ...)
is available
for when Espruino is connecting to another device (central mode).
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
NRF.requestDevice ⇒
Call type:
NRF.requestDevice(options)
Parameters
options
- Options used to filter the device to use
Returns
A Promise
that is resolved (or rejected) when the connection is complete
Description
Search for available devices matching the given filters. Since we have no UI
here, Espruino will pick the FIRST device it finds, or it'll call catch
.
options
can have the following fields:
filters
- a list of filters that a device must match before it is returned (see below)timeout
- the maximum time to scan for in milliseconds (scanning stops when a match is found. e.g.NRF.requestDevice({ timeout:2000, filters: [ ... ] })
active
- whether to perform active scanning (requesting 'scan response' packets from any devices that are found). e.g.NRF.requestDevice({ active:true, filters: [ ... ] })
phy
- (NRF52833/NRF52840 only) use the long-range coded phy ("1mbps"
default, can be"1mbps/2mbps/both/coded"
)extended
- (NRF52833/NRF52840 only) support receiving extended-length advertising packets (default=true if phy isn't"1mbps"
)
NOTE: timeout
and active
are not part of the Web Bluetooth standard.
The following filter types are implemented:
services
- list of services as strings (all of which must match). 128 bit services must be in the form '01230123-0123-0123-0123-012301230123'name
- exact device namenamePrefix
- starting characters of device nameid
- exact device address (id:"e9:53:86:09:89:99 random"
) (this is Espruino-specific, and is not part of the Web Bluetooth spec)serviceData
- an object containing service characteristics which must all match (serviceData:{"1809":{}}
). Matching of actual service data is not supported yet.manufacturerData
- an object containing manufacturer UUIDs which must all match (manufacturerData:{0x0590:{}}
). Matching of actual manufacturer data is not supported yet.
NRF.requestDevice({ filters: [{ namePrefix: 'Puck.js' }] }).then(function(device) { ... });
// or
NRF.requestDevice({ filters: [{ services: ['1823'] }] }).then(function(device) { ... });
// or
NRF.requestDevice({ filters: [{ manufacturerData:{0x0590:{}} }] }).then(function(device) { ... });
As a full example, to send data to another Puck.js to turn an LED on:
var gatt;
NRF.requestDevice({ filters: [{ namePrefix: 'Puck.js' }] }).then(function(device) {
return device.gatt.connect();
}).then(function(g) {
gatt = g;
return gatt.getPrimaryService("6e400001-b5a3-f393-e0a9-e50e24dcca9e");
}).then(function(service) {
return service.getCharacteristic("6e400002-b5a3-f393-e0a9-e50e24dcca9e");
}).then(function(characteristic) {
return characteristic.writeValue("LED1.set()\n");
}).then(function() {
gatt.disconnect();
console.log("Done!");
});
Or slightly more concisely, using ES6 arrow functions:
var gatt;
NRF.requestDevice({ filters: [{ namePrefix: 'Puck.js' }]}).then(
device => device.gatt.connect()).then(
g => (gatt=g).getPrimaryService("6e400001-b5a3-f393-e0a9-e50e24dcca9e")).then(
service => service.getCharacteristic("6e400002-b5a3-f393-e0a9-e50e24dcca9e")).then(
characteristic => characteristic.writeValue("LED1.reset()\n")).then(
() => { gatt.disconnect(); console.log("Done!"); } );
Note that you have to keep track of the gatt
variable so that you can
disconnect the Bluetooth connection when you're done.
Note: Using a filter in NRF.requestDevice
filters each advertising packet
individually. As soon as a matching advertisement is received,
NRF.requestDevice
resolves the promise and stops scanning. This means that if
you filter based on a service UUID and a device advertises with multiple packets
(or a scan response when active:true
) only the packet matching the filter is
returned - you may not get the device's name is that was in a separate packet.
To aggregate multiple packets you can use NRF.findDevices
.
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) and ESP32 boards
NRF.resolveAddress ⇒
Call type:
NRF.resolveAddress(options)
Parameters
options
- The address that should be resolved.
Returns
The resolved address, or undefined
if it couldn't be resolved.
Description
Try to resolve a bonded peer's address from a random private resolvable address. If the peer
is not bonded, there will be no IRK and undefined
will be returned.
A bunch of devices, especially smartphones, implement address randomisation and periodically change their bluetooth address to prevent being tracked.
If such a device uses a "random private resolvable address", that address is generated with the help of an identity resolving key (IRK) that is exchanged during bonding.
If we know the IRK of a device, we can check if an address was potentially generated by that device.
The following will check an address against the IRKs of all bonded devices, and return the actual address of a bonded device if the given address was likely generated using that device's IRK:
NRF.on('connect',addr=> {
// addr could be "aa:bb:cc:dd:ee:ff private-resolvable"
if (addr.endsWith("private-resolvable")) {
let resolved = NRF.resolveAddress(addr);
// resolved is "aa:bb:cc:dd:ee:ff public"
if (resolved) addr = resolved;
}
console.log("Device connected: ", addr);
})
You can get the current connection's address using NRF.getSecurityStatus().connected_addr
,
so can for instance do NRF.resolveAddress(NRF.getSecurityStatus().connected_addr)
.
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) with PEERMANAGERENABLED
NRF.restart ⇒
Call type:
NRF.restart(callback)
Parameters
callback
- [optional] A function to be called while the softdevice is uninitialised. Use with caution - accessing console/bluetooth will almost certainly result in a crash.
Description
Restart the Bluetooth softdevice (if there is currently a BLE connection, it will queue a restart to be done when the connection closes).
You shouldn't need to call this function in normal usage. However, Nordic's BLE softdevice has some settings that cannot be reset. For example there are only a certain number of unique UUIDs. Once these are all used the only option is to restart the softdevice to clear them all out.
event NRF.security ⇒
Call type:
NRF.on('security', function(status) { ... });
Parameters
status
- An object containing `{authstatus,bonded,lv4,kdistown,kdist_peer}
Description
Contains updates on the security of the current Bluetooth link.
See Nordic's ble_gap_evt_auth_status_t
structure for more information.
NRF.sendHIDReport ⇒
Call type:
NRF.sendHIDReport(data, callback)
Parameters
data
- Input report data as an array
callback
- A callback function to be called when the data is sent
Description
Send a USB HID report. HID must first be enabled with
NRF.setServices({}, {hid:
hid_report})
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
event NRF.servicesDiscover ⇒
Call type:
NRF.on('servicesDiscover', function() { ... });
Description
Called with discovered services when discovery is finished
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q) and ESP32 boards
NRF.setAddress ⇒
Call type:
NRF.setAddress(addr)
Parameters
addr
- The address to use (as a string)
Description
Set this device's default Bluetooth MAC address:
NRF.setAddress("ff:ee:dd:cc:bb:aa random");
Addresses take the form:
"ff:ee:dd:cc:bb:aa"
or"ff:ee:dd:cc:bb:aa public"
for a public address"ff:ee:dd:cc:bb:aa random"
for a random static address (the default for Espruino)
This may throw a INVALID_BLE_ADDR
error if the upper two bits of the address
don't match the address type.
To change the address, Espruino must restart the softdevice. It will only do so when it is disconnected from other devices.
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
NRF.setAdvertising ⇒
Call type:
NRF.setAdvertising(data, options)
Parameters
data
- The service data to advertise as an object - see below for more info
options
- [optional] Object of options
Description
Change the data that Espruino advertises.
Data can be of the form { UUID : data_as_byte_array }
. The UUID should be a
Bluetooth Service
ID.
For example to return battery level at 95%, do:
NRF.setAdvertising({
0x180F : [95] // Service data 0x180F = 95
});
Or you could report the current temperature:
setInterval(function() {
NRF.setAdvertising({
0x1809 : [Math.round(E.getTemperature())]
});
}, 30000);
If you specify a value for the object key, Service Data is advertised. However
if you specify undefined
, the Service UUID is advertised:
NRF.setAdvertising({
0x180D : undefined // Advertise service UUID 0x180D (HRM)
});
Service UUIDs can also be supplied in the second argument of NRF.setServices
,
but those go in the scan response packet.
You can also supply the raw advertising data in an array. For example to advertise as an Eddystone beacon:
NRF.setAdvertising([0x03, // Length of Service List
0x03, // Param: Service List
0xAA, 0xFE, // Eddystone ID
0x13, // Length of Service Data
0x16, // Service Data
0xAA, 0xFE, // Eddystone ID
0x10, // Frame type: URL
0xF8, // Power
0x03, // https://
'g','o','o','.','g','l','/','B','3','J','0','O','c'],
{interval:100});
(However for Eddystone we'd advise that you use the Espruino Eddystone library)
Note: When specifying data as an array, certain advertising options such as
discoverable
and showName
won't have any effect.
Note: The size of Bluetooth LE advertising packets is limited to 31 bytes.
If you want to advertise more data, consider using an array for data
(See
below), or NRF.setScanResponse
.
You can even specify an array of arrays or objects, in which case each advertising packet will be used in turn - for instance to make your device advertise battery level and its name as well as both Eddystone and iBeacon :
NRF.setAdvertising([
{0x180F : [E.getBattery()]}, // normal advertising, with battery %
require("ble_ibeacon").get(...), // iBeacon
require("ble_eddystone").get(...), // eddystone
], {interval:300});
options
is an object, which can contain:
{
name: "Hello" // The name of the device
showName: true/false // include full name, or nothing
discoverable: true/false // general discoverable, or limited - default is limited
connectable: true/false // whether device is connectable - default is true
scannable : true/false // whether device can be scanned for scan response packets - default is true
whenConnected : true/false // keep advertising when connected (nRF52 only)
// switches to advertising as non-connectable when it is connected
interval: 600 // Advertising interval in msec, between 20 and 10000 (default is 375ms)
manufacturer: 0x0590 // IF sending manufacturer data, this is the manufacturer ID
manufacturerData: [...] // IF sending manufacturer data, this is an array of data
phy: "1mbps/2mbps/coded" // (NRF52833/NRF52840 only) use the long-range coded phy for transmission (1mbps default)
}
Setting connectable
and scannable
to false gives the lowest power
consumption as the BLE radio doesn't have to listen after sending advertising.
NOTE: Non-connectable
advertising can't have an advertising interval less
than 100ms according to the BLE spec.
So for instance to set the name of Puck.js without advertising any other data you can just use the command:
NRF.setAdvertising({},{name:"Hello"});
You can also specify 'manufacturer data', which is another form of advertising data. We've registered the Manufacturer ID 0x0590 (as Pur3 Ltd) for use with Official Espruino devices - use it to advertise whatever data you'd like, but we'd recommend using JSON.
For example by not advertising a device name you can send up to 24 bytes of JSON on Espruino's manufacturer ID:
var data = {a:1,b:2};
NRF.setAdvertising({},{
showName:false,
manufacturer:0x0590,
manufacturerData:JSON.stringify(data)
});
If you're using EspruinoHub then it will automatically decode this into the following MQTT topics:
/ble/advertise/ma:c_:_a:dd:re:ss/espruino
->{"a":10,"b":15}
/ble/advertise/ma:c_:_a:dd:re:ss/a
->1
/ble/advertise/ma:c_:_a:dd:re:ss/b
->2
Note that you only have 24 characters available for JSON, so try to use the shortest field names possible and avoid floating point values that can be very long when converted to a String.
NRF.setConnectionInterval ⇒
Call type:
NRF.setConnectionInterval(interval)
Parameters
interval
- The connection interval to use (see below)
Description
When connected, Bluetooth LE devices communicate at a set interval. Lowering the interval (e.g. more packets/second) means a lower delay when sending data, higher bandwidth, but also more power consumption.
By default, when connected as a peripheral Espruino automatically adjusts the connection interval. When connected it's as fast as possible (7.5ms) but when idle for over a minute it drops to 200ms. On continued activity (>1 BLE operation) the interval is raised to 7.5ms again.
The options for interval
are:
undefined
/"auto"
: (default) automatically adjust connection interval100
: set min and max connection interval to the same number (between 7.5ms and 4000ms){minInterval:20, maxInterval:100}
: set min and max connection interval as a range
This configuration is not remembered during a save()
- you will have to re-set
it via onInit
.
Note: If connecting to another device (as Central), you can use an extra
argument to NRF.connect
or BluetoothRemoteGATTServer.connect
to specify a
connection interval.
Note: This overwrites any changes imposed by the deprecated
NRF.setLowPowerConnection
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
NRF.setLowPowerConnection ⇒
Call type:
NRF.setLowPowerConnection(lowPower)
Parameters
lowPower
- Whether the connection is low power or not
Description
THIS IS DEPRECATED - please use NRF.setConnectionInterval
for peripheral
and NRF.connect(addr, options)
/BluetoothRemoteGATTServer.connect(options)
for central connections.
This sets the connection parameters - these affect the transfer speed and power usage when the device is connected.
- When not low power, the connection interval is between 7.5 and 20ms
- When low power, the connection interval is between 500 and 1000ms
When low power connection is enabled, transfers of data over Bluetooth will be very slow, however power usage while connected will be drastically decreased.
This will only take effect after the connection is disconnected and re-established.
NRF.setRSSIHandler ⇒
Call type:
NRF.setRSSIHandler(callback)
Parameters
callback
- The callback to call with the RSSI value, or undefined to stop
Description
Start/stop listening for RSSI values on the currently active connection (where This device is a peripheral and is being connected to by a 'central' device)
// Start scanning
NRF.setRSSIHandler(function(rssi) {
console.log(rssi); // prints -85 (or similar)
});
// Stop Scanning
NRF.setRSSIHandler();
RSSI is the 'Received Signal Strength Indication' in dBm
NRF.setScan ⇒
Call type:
NRF.setScan(callback, options)
Parameters
callback
- The callback to call with received advertising packets, or undefined to stop
options
- [optional] An object {filters: ...}
(as would be passed to NRF.requestDevice
) to filter devices by
Description
Start/stop listening for BLE advertising packets within range. Returns a
BluetoothDevice
for each advertising packet. By default this is not an active
scan, so Scan Response advertising data is not included (see below)
// Start scanning
packets=10;
NRF.setScan(function(d) {
packets--;
if (packets<=0)
NRF.setScan(); // stop scanning
else
console.log(d); // print packet info
});
Each BluetoothDevice
will look a bit like:
BluetoothDevice {
"id": "aa:bb:cc:dd:ee:ff", // address
"rssi": -89, // signal strength
"services": [ "128bit-uuid", ... ], // zero or more service UUIDs
"data": new Uint8Array([ ... ]).buffer, // ArrayBuffer of returned data
"serviceData" : { "0123" : [ 1 ] }, // if service data is in 'data', it's extracted here
"manufacturer" : 0x1234, // if manufacturer data is in 'data', the 16 bit manufacturer ID is extracted here
"manufacturerData" : new Uint8Array([...]).buffer, // if manufacturer data is in 'data', the data is extracted here as an ArrayBuffer
"name": "DeviceName" // the advertised device name
}
You can also supply a set of filters (as described in NRF.requestDevice
) as a
second argument, which will allow you to filter the devices you get a callback
for. This helps to cut down on the time spent processing JavaScript code in
areas with a lot of Bluetooth advertisements. For example to find only devices
with the manufacturer data 0x0590
(Espruino's ID) you could do:
NRF.setScan(function(d) {
console.log(d.manufacturerData);
}, { filters: [{ manufacturerData:{0x0590:{}} }] });
You can also specify active:true
in the second argument to perform active
scanning (this requests scan response packets) from any devices it finds.
Note: Using a filter in setScan
filters each advertising packet
individually. As a result, if you filter based on a service UUID and a device
advertises with multiple packets (or a scan response when active:true
) only
the packets matching the filter are returned. To aggregate multiple packets you
can use NRF.findDevices
.
Note: BLE advertising packets can arrive quickly - faster than you'll be
able to print them to the console. It's best only to print a few, or to use a
function like NRF.findDevices(..)
which will collate a list of available
devices.
Note: Using setScan turns the radio's receive mode on constantly. This can draw a lot of power (12mA or so), so you should use it sparingly or you can run your battery down quickly.
NRF.setScanResponse ⇒
Call type:
NRF.setScanResponse(data)
Parameters
data
- The data to for the scan response
Description
The raw scan response data should be supplied as an array. For example to return "Sample" for the device name:
NRF.setScanResponse([0x07, // Length of Data
0x09, // Param: Complete Local Name
'S', 'a', 'm', 'p', 'l', 'e']);
Note: NRF.setServices(..., {advertise:[ ... ]})
writes advertised services
into the scan response - so you can't use both advertise
and NRF.setServices
or one will overwrite the other.
NRF.setSecurity ⇒
Call type:
NRF.setSecurity(options)
Parameters
options
- An object containing security-related options (see below)
Description
Sets the security options used when connecting/pairing. This applies to both central and peripheral mode.
NRF.setSecurity({
display : bool // default false, can this device display a passkey on a screen/etc?
// - sent via the `BluetoothDevice.passkey` event
keyboard : bool // default false, can this device enter a passkey
// - request sent via the `BluetoothDevice.passkeyRequest` event
pair : bool // default true, allow other devices to pair with this device
bond : bool // default true, Perform bonding
// This stores info from pairing in flash and allows reconnecting without having to pair each time
mitm : bool // default false, Man In The Middle protection
lesc : bool // default false, LE Secure Connections
passkey : // default "", or a 6 digit passkey to use (display must be true for this)
oob : [0..15] // if specified, Out Of Band pairing is enabled and
// the 16 byte pairing code supplied here is used
encryptUart : bool // default false (unless oob or passkey specified)
// This sets the BLE UART service such that it
// is encrypted and can only be used from a paired connection
});
NOTE: Some combinations of arguments will cause an error. For example
supplying a passkey without display:1
is not allowed. If display:1
is set
you do not require a physical display, the user just needs to know the passkey
you supplied.
For instance, to require pairing and to specify a passkey, use:
NRF.setSecurity({passkey:"123456", mitm:1, display:1});
Or to require pairing and to display a PIN that the connecting device provides, use:
NRF.setSecurity({mitm:1, display:1});
NRF.on("passkey", key => print("Enter PIN: ", key));
However, while most devices will request a passkey for pairing at this point it is still possible for a device to connect without requiring one (e.g. using the 'NRF Connect' app).
To force a passkey you need to protect each characteristic you define with
NRF.setSecurity
. For instance the following code will require that the
passkey 123456
is entered before the characteristic
9d020002-bf5f-1d1a-b52a-fe52091d5b12
can be read.
NRF.setSecurity({passkey:"123456", mitm:1, display:1});
NRF.setServices({
"9d020001-bf5f-1d1a-b52a-fe52091d5b12" : {
"9d020002-bf5f-1d1a-b52a-fe52091d5b12" : {
// readable always
value : "Not Secret"
},
"9d020003-bf5f-1d1a-b52a-fe52091d5b12" : {
// readable only once bonded
value : "Secret",
readable : true,
security: {
read: {
mitm: true,
encrypted: true
}
}
},
"9d020004-bf5f-1d1a-b52a-fe52091d5b12" : {
// readable always
// writable only once bonded
value : "Readable",
readable : true,
writable : true,
onWrite : function(evt) {
console.log("Wrote ", evt.data);
},
security: {
write: {
mitm: true,
encrypted: true
}
}
}
}
});
Note: If passkey
or oob
is specified, the Nordic UART service (if
enabled) will automatically be set to require encryption, but otherwise it is
open.
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
NRF.setServices ⇒
Call type:
NRF.setServices(data, options)
Parameters
data
- The service (and characteristics) to advertise
options
- [optional] Object containing options
Description
Change the services and characteristics Espruino advertises.
If you want to change the value of a characteristic, you need to use
NRF.updateServices()
instead
To expose some information on Characteristic ABCD
on service BCDE
you could
do:
NRF.setServices({
0xBCDE : {
0xABCD : {
value : "Hello",
readable : true
}
}
});
Or to allow the 3 LEDs to be controlled by writing numbers 0 to 7 to a
characteristic, you can do the following. evt.data
is an ArrayBuffer.
NRF.setServices({
0xBCDE : {
0xABCD : {
writable : true,
onWrite : function(evt) {
digitalWrite([LED3,LED2,LED1], evt.data[0]);
}
}
}
});
You can supply many different options:
NRF.setServices({
0xBCDE : {
0xABCD : {
value : "Hello", // optional
maxLen : 5, // optional (otherwise is length of initial value)
broadcast : false, // optional, default is false
readable : true, // optional, default is false
writable : true, // optional, default is false
notify : true, // optional, default is false
indicate : true, // optional, default is false
description: "My Characteristic", // optional, default is null,
security: { // optional - see NRF.setSecurity
read: { // optional
encrypted: false, // optional, default is false
mitm: false, // optional, default is false
lesc: false, // optional, default is false
signed: false // optional, default is false
},
write: { // optional
encrypted: true, // optional, default is false
mitm: false, // optional, default is false
lesc: false, // optional, default is false
signed: false // optional, default is false
}
},
onWrite : function(evt) { // optional
console.log("Got ", evt.data); // an ArrayBuffer
},
onWriteDesc : function(evt) { // optional - called when the 'cccd' descriptor is written
// for example this is called when notifications are requested by the client:
console.log("Notifications enabled = ", evt.data[0]&1);
}
}
// more characteristics allowed
}
// more services allowed
});
Note: UUIDs can be integers between 0
and 0xFFFF
, strings of the form
"ABCD"
, or strings of the form "ABCDABCD-ABCD-ABCD-ABCD-ABCDABCDABCD"
options
can be of the form:
NRF.setServices(undefined, {
hid : new Uint8Array(...), // optional, default is undefined. Enable BLE HID support
uart : true, // optional, default is true. Enable BLE UART support
advertise: [ '180D' ] // optional, list of service UUIDs to advertise
ancs : true, // optional, Bangle.js-only, enable Apple ANCS support for notifications (see `NRF.ancs*`)
ams : true // optional, Bangle.js-only, enable Apple AMS support for media control (see `NRF.ams*`)
cts : true // optional, Bangle.js-only, enable Apple Current Time Service support (see `NRF.ctsGetTime`)
});
To enable BLE HID, you must set hid
to an array which is the BLE report
descriptor. The easiest way to do this is to use the ble_hid_controls
or
ble_hid_keyboard
modules.
Note: Just creating a service doesn't mean that the service will be
advertised. It will only be available after a device connects. To advertise,
specify the UUIDs you wish to advertise in the advertise
field of the second
options
argument. For example this will create and advertise a heart rate
service:
NRF.setServices({
0x180D: { // heart_rate
0x2A37: { // heart_rate_measurement
notify: true,
value : [0x06, heartrate],
}
}
}, { advertise: [ '180D' ] });
You may specify 128 bit UUIDs to advertise, however you may get a DATA_SIZE
exception because there is insufficient space in the Bluetooth LE advertising
packet for the 128 bit UART UUID as well as the UUID you specified. In this case
you can add uart:false
after the advertise
element to disable the UART,
however you then be unable to connect to Puck.js's console via Bluetooth.
If you absolutely require two or more 128 bit UUIDs then you will have to
specify your own raw advertising data packets with NRF.setAdvertising
Note:* The services on Espruino can only be modified when there is no device connected to it as it requires a restart of the Bluetooth stack. *iOS devices will 'cache' the list of services so apps like NRF Connect may incorrectly display the old services even after you have modified them. To fix this, disable and re-enable Bluetooth on your iOS device, or use an Android device to run NRF Connect.
Note: Not all combinations of security configuration values are valid, the
valid combinations are: encrypted, encrypted + mitm, lesc, signed, signed +
mitm. See NRF.setSecurity
for more information.
NRF.setTxPower ⇒
Call type:
NRF.setTxPower(power)
Parameters
power
- Transmit power. Accepted values are -40(nRF52 only), -30(nRF51 only), -20, -16, -12, -8, -4, 0, and 4 dBm. On nRF52840 (eg Bangle.js 2) 5/6/7/8 dBm are available too. Others will give an error code.
Description
Set the BLE radio transmit power. The default TX power is 0 dBm, and
NRF.setWhitelist ⇒
Call type:
NRF.setWhitelist(whitelisting)
Parameters
whitelisting
- Are we using a whitelist? (default false)
Description
If set to true, whenever a device bonds it will be added to the whitelist.
When set to false, the whitelist is cleared and newly bonded devices will not be added to the whitelist.
Note: This is remembered between reset()
s but isn't remembered after
power-on (you'll have to add it to onInit()
.
Note: This is only available in NRF52 devices (like Puck.js, Pixl.js, Bangle.js and MDBT42Q)
NRF.sleep ⇒
Call type:
NRF.sleep()
Description
Disable Bluetooth advertising and disconnect from any device that connected to Puck.js as a peripheral (this won't affect any devices that Puck.js initiated connections to).
This makes Puck.js undiscoverable, so it can't be connected to.
Use NRF.wake()
to wake up and make Puck.js connectable again.
NRF.startBonding ⇒
Call type:
NRF.startBonding(forceRepair)
Parameters
forceRepair
- True if we should force repairing even if there is already valid pairing info
Returns
A promise
NRF.updateServices ⇒
Call type:
NRF.updateServices(data)
Parameters
data
- The service (and characteristics) to update
Description
Update values for the services and characteristics Espruino advertises. Only
services and characteristics previously declared using NRF.setServices
are
affected.
To update the '0xABCD' characteristic in the '0xBCDE' service:
NRF.updateServices({
0xBCDE : {
0xABCD : {
value : "World"
}
}
});
You can also use 128 bit UUIDs, for example
"b7920001-3c1b-4b40-869f-3c0db9be80c6"
.
To define a service and characteristic and then notify connected clients of a change to it when a button is pressed:
NRF.setServices({
0xBCDE : {
0xABCD : {
value : "Hello",
maxLen : 20,
notify: true
}
}
});
setWatch(function() {
NRF.updateServices({
0xBCDE : {
0xABCD : {
value : "World!",
notify: true
}
}
});
}, BTN, { repeat:true, edge:"rising", debounce: 50 });
This only works if the characteristic was created with notify: true
using
NRF.setServices
, otherwise the characteristic will be updated but no
notification will be sent.
Also note that maxLen
was specified. If it wasn't then the maximum length of
the characteristic would have been 5 - the length of "Hello"
.
To indicate (i.e. notify with ACK) connected clients of a change to the '0xABCD' characteristic in the '0xBCDE' service:
NRF.updateServices({
0xBCDE : {
0xABCD : {
value : "World",
indicate: true
}
}
});
This only works if the characteristic was created with indicate: true
using
NRF.setServices
, otherwise the characteristic will be updated but no
notification will be sent.
Note: See NRF.setServices
for more information
NRF.wake ⇒
Call type:
NRF.wake()
Description
Enable Bluetooth advertising (this is enabled by default), which allows other devices to discover and connect to Puck.js.
Use NRF.sleep()
to disable advertising.
Nucleo Class
This is the built-in class for the Arduino-style pin namings on ST Nucleo boards
Methods and Fields
- Nucleo.A0
- Nucleo.A1
- Nucleo.A2
- Nucleo.A3
- Nucleo.A4
- Nucleo.A5
- Nucleo.D0
- Nucleo.D1
- Nucleo.D10
- Nucleo.D11
- Nucleo.D12
- Nucleo.D13
- Nucleo.D14
- Nucleo.D15
- Nucleo.D2
- Nucleo.D3
- Nucleo.D4
- Nucleo.D5
- Nucleo.D6
- Nucleo.D7
- Nucleo.D8
- Nucleo.D9
Nucleo.A0 ⇒
Call type:
Nucleo.A0
Returns
A Pin
Nucleo.A1 ⇒
Call type:
Nucleo.A1
Returns
A Pin
Nucleo.A2 ⇒
Call type:
Nucleo.A2
Returns
A Pin
Nucleo.A3 ⇒
Call type:
Nucleo.A3
Returns
A Pin
Nucleo.A4 ⇒
Call type:
Nucleo.A4
Returns
A Pin
Nucleo.A5 ⇒
Call type:
Nucleo.A5
Returns
A Pin
Nucleo.D0 ⇒
Call type:
Nucleo.D0
Returns
A Pin
Nucleo.D1 ⇒
Call type:
Nucleo.D1
Returns
A Pin
Nucleo.D10 ⇒
Call type:
Nucleo.D10
Returns
A Pin
Nucleo.D11 ⇒
Call type:
Nucleo.D11
Returns
A Pin
Nucleo.D12 ⇒
Call type:
Nucleo.D12
Returns
A Pin
Nucleo.D13 ⇒
Call type:
Nucleo.D13
Returns
A Pin
Nucleo.D14 ⇒
Call type:
Nucleo.D14
Returns
A Pin
Nucleo.D15 ⇒
Call type:
Nucleo.D15
Returns
A Pin
Nucleo.D2 ⇒
Call type:
Nucleo.D2
Returns
A Pin
Nucleo.D3 ⇒
Call type:
Nucleo.D3
Returns
A Pin
Nucleo.D4 ⇒
Call type:
Nucleo.D4
Returns
A Pin
Nucleo.D5 ⇒
Call type:
Nucleo.D5
Returns
A Pin
Nucleo.D6 ⇒
Call type:
Nucleo.D6
Returns
A Pin
Nucleo.D7 ⇒
Call type:
Nucleo.D7
Returns
A Pin
Nucleo.D8 ⇒
Call type:
Nucleo.D8
Returns
A Pin
Nucleo.D9 ⇒
Call type:
Nucleo.D9
Returns
A Pin
Number Class
This is the built-in JavaScript class for numbers.
Methods and Fields
- Number.MAX_VALUE
- Number.MIN_VALUE
- Number.NaN
- Number.NEGATIVE_INFINITY
- constructor Number(value, ...)
- Number.POSITIVE_INFINITY
- function Number.toFixed(decimalPlaces)
Number.MAX_VALUE ⇒
Call type:
Number.MAX_VALUE
Returns
Maximum representable value
Number.MIN_VALUE ⇒
Call type:
Number.MIN_VALUE
Returns
Smallest representable value
Number.NaN ⇒
Call type:
Number.NaN
Returns
Not a Number
Number.NEGATIVE_INFINITY ⇒
Call type:
Number.NEGATIVE_INFINITY
Returns
Negative Infinity (-1/0)
constructor Number ⇒
Call type:
new Number(value, ...)
Parameters
value, ...
- A single value to be converted to a number
Returns
A Number object
Description
Creates a number
Number.POSITIVE_INFINITY ⇒
Call type:
Number.POSITIVE_INFINITY
Returns
Positive Infinity (1/0)
function Number.toFixed ⇒
Call type:
function Number.toFixed(decimalPlaces)
Parameters
decimalPlaces
- A number between 0 and 20 specifying the number of decimal digits after the decimal point
Returns
A string
Description
Format the number as a fixed point number
Object Class
This is the built-in class for Objects
Methods and Fields
- function Object.addListener(event, listener)
- Object.assign(args, ...)
- function Object.clone()
- Object.create(proto, propertiesObject)
- Object.defineProperties(obj, props)
- Object.defineProperty(obj, name, desc)
- function Object.emit(event, args, ...)
- Object.entries(object)
- Object.fromEntries(entries)
- Object.getOwnPropertyDescriptor(obj, name)
- Object.getOwnPropertyDescriptors(obj)
- Object.getOwnPropertyNames(object)
- Object.getPrototypeOf(object)
- function Object.hasOwnProperty(name)
- Object.keys(object)
- property Object.length
- constructor Object(value)
- function Object.on(event, listener)
- function Object.prependListener(event, listener)
- function Object.removeAllListeners(event)
- function Object.removeListener(event, listener)
- Object.setPrototypeOf(object, prototype)
- function Object.toString(radix)
- function Object.valueOf()
- Object.values(object)
function Object.addListener ⇒
Call type:
function Object.addListener(event, listener)
Parameters
event
- The name of the event, for instance 'data'
listener
- The listener to call when this event is received
Description
Register an event listener for this object, for instance Serial1.addListener('data', function(d) {...})
.
An alias for Object.on
Note: This is not available in Embeddable Espruino C builds
Object.assign ⇒
Call type:
Object.assign(args, ...)
Parameters
args, ...
- The target object, then any items objects to use as sources of keys
Returns
The target object
Description
Appends all keys and values in any subsequent objects to the first object
Note: Unlike the standard ES6 Object.assign
, this will throw an exception
if given raw strings, bools or numbers rather than objects.
function Object.clone ⇒
Call type:
function Object.clone()
Returns
A copy of this Object
Description
Copy this object completely
Object.create ⇒
Call type:
Object.create(proto, propertiesObject)
Parameters
proto
- A prototype object
propertiesObject
- An object containing properties. NOT IMPLEMENTED
Returns
A new object
Description
Creates a new object with the specified prototype object and properties. properties are currently unsupported.
Object.defineProperties ⇒
Call type:
Object.defineProperties(obj, props)
Parameters
obj
- An object
props
- An object whose fields represent property names, and whose values are property descriptors.
Returns
The object, obj.
Description
Adds new properties to the Object. See Object.defineProperty
for more
information
Object.defineProperty ⇒
Call type:
Object.defineProperty(obj, name, desc)
Parameters
obj
- An object
name
- The name of the property
desc
- The property descriptor
Returns
The object, obj.
Description
Add a new property to the Object. 'Desc' is an object with the following fields:
configurable
(bool = false) - can this property be changed/deleted (not implemented)enumerable
(bool = false) - can this property be enumerated (not implemented)value
(anything) - the value of this propertywritable
(bool = false) - can the value be changed with the assignment operator?get
(function) - the getter function, or undefined if no getter (only supported on some platforms)set
(function) - the setter function, or undefined if no setter (only supported on some platforms)
Note: configurable
, enumerable
and writable
are not implemented and
will be ignored.
function Object.emit ⇒
Call type:
function Object.emit(event, args, ...)
Parameters
event
- The name of the event, for instance 'data'
args, ...
- Optional arguments
Description
Call any event listeners that were added to this object with Object.on
, for
instance obj.emit('data', 'Foo')
.
For more information see Object.on
Note: This is not available in Embeddable Espruino C builds
Object.entries ⇒
Call type:
Object.entries(object)
Parameters
object
- The object to return values for
Returns
An array of [key,value]
pairs - one for each key on the given object
Description
Return all enumerable keys and values of the given object
Note: This is not available in devices with low flash memory
Object.fromEntries ⇒
Call type:
Object.fromEntries(entries)
Parameters
entries
- An array of [key,value]
pairs to be used to create an object
Returns
An object containing all the specified pairs
Description
Transforms an array of key-value pairs into an object
Note: This is not available in devices with low flash memory
Object.getOwnPropertyDescriptor ⇒
Call type:
Object.getOwnPropertyDescriptor(obj, name)
Parameters
obj
- The object
name
- The name of the property
Returns
An object with a description of the property. The values of writable/enumerable/configurable may not be entirely correct due to Espruino's implementation.
Description
Get information on the given property in the object, or undefined
Object.getOwnPropertyDescriptors ⇒
Call type:
Object.getOwnPropertyDescriptors(obj)
Parameters
obj
- The object
Returns
An object containing all the property descriptors of an object
Description
Get information on all properties in the object (from Object.getOwnPropertyDescriptor
), or just {}
if no properties
Note: This is not available in devices with low flash memory
Object.getOwnPropertyNames ⇒
Call type:
Object.getOwnPropertyNames(object)
Parameters
object
- The Object to return a list of property names for
Returns
An array of the Object's own properties
Description
Returns an array of all properties (enumerable or not) found directly on a given object.
Object.getPrototypeOf ⇒
Call type:
Object.getPrototypeOf(object)
Parameters
object
- An object
Returns
The prototype
Description
Get the prototype of the given object - this is like writing object.__proto__
but is the 'proper' ES6 way of doing it
function Object.hasOwnProperty ⇒
Call type:
function Object.hasOwnProperty(name)
Parameters
name
- The name of the property to search for
Returns
True if it exists, false if it doesn't
Description
Return true if the object (not its prototype) has the given property.
NOTE: This currently returns false-positives for built-in functions in prototypes
Object.keys ⇒
Call type:
Object.keys(object)
Parameters
object
- The object to return keys for
Returns
An array of strings - one for each key on the given object
Description
Return all enumerable keys of the given object
property Object.length ⇒
Call type:
property Object.length
Returns
The length of the object
Description
Find the length of the object
constructor Object ⇒
Call type:
new Object(value)
Parameters
value
- A single value to be converted to an object
Returns
An Object
Description
Creates an Object from the supplied argument
function Object.on ⇒
Call type:
function Object.on(event, listener)
Parameters
event
- The name of the event, for instance 'data'
listener
- The listener to call when this event is received
Description
Register an event listener for this object, for instance
Serial1.on('data',
function(d) {...})
.
This is the same as Node.js's EventEmitter but on Espruino the functionality is built into every object:
var o = {}; // o can be any object...
// call an arrow function when the 'answer' event is received
o.on('answer', x => console.log(x));
// call a named function when the 'answer' event is received
function printAnswer(d) {
console.log("The answer is", d);
}
o.on('answer', printAnswer);
// emit the 'answer' event - functions added with 'on' will be executed
o.emit('answer', 42);
// prints: 42
// prints: The answer is 42
// If you have a named function, it can be removed by name
o.removeListener('answer', printAnswer);
// Now 'printAnswer' is removed
o.emit('answer', 43);
// prints: 43
// Or you can remove all listeners for 'answer'
o.removeAllListeners('answer')
// Now nothing happens
o.emit('answer', 44);
// nothing printed
If you have more than one handler for an event, and you'd
like that handler to stop the event being passed to other handlers
then you can call E.stopEventPropagation()
in that handler.
Note: This is not available in Embeddable Espruino C builds
function Object.prependListener ⇒
Call type:
function Object.prependListener(event, listener)
Parameters
event
- The name of the event, for instance 'data'
listener
- The listener to call when this event is received
Description
Register an event listener for this object, for instance Serial1.addListener('data', function(d) {...})
.
An alias for Object.on
Note: This is not available in Embeddable Espruino C builds
function Object.removeAllListeners ⇒
Call type:
function Object.removeAllListeners(event)
Parameters
event
- [optional] The name of the event, for instance 'data'
. If not specified all listeners are removed.
Description
Removes all listeners (if event===undefined
), or those of the specified event.
Serial1.on("data", function(data) { ... });
Serial1.removeAllListeners("data");
// or
Serial1.removeAllListeners(); // removes all listeners for all event types
For more information see Object.on
function Object.removeListener ⇒
Call type:
function Object.removeListener(event, listener)
Parameters
event
- The name of the event, for instance 'data'
listener
- The listener to remove
Description
Removes the specified event listener.
function foo(d) {
console.log(d);
}
Serial1.on("data", foo);
Serial1.removeListener("data", foo);
For more information see Object.on
Object.setPrototypeOf ⇒
Call type:
Object.setPrototypeOf(object, prototype)
Parameters
object
- An object
prototype
- The prototype to set on the object
Returns
The object passed in
Description
Set the prototype of the given object - this is like writing
object.__proto__ =
prototype
but is the 'proper' ES6 way of doing it
function Object.toString ⇒
Call type:
function Object.toString(radix)
Parameters
radix
- [optional] If the object is an integer, the radix (between 2 and 36) to use. NOTE: Setting a radix does not work on floating point numbers.
Returns
A String representing the object
Description
Convert the Object to a string
function Object.valueOf ⇒
Call type:
function Object.valueOf()
Returns
The primitive value of this object
Description
Returns the primitive value of this object.
Object.values ⇒
Call type:
Object.values(object)
Parameters
object
- The object to return values for
Returns
An array of values - one for each key on the given object
Description
Return all enumerable values of the given object
Note: This is not available in devices with low flash memory
OneWire Class
This class provides a software-defined OneWire master. It is designed to be similar to Arduino's OneWire library.
Note: OneWire commands are very timing-sensitive, and on nRF52 devices
(Bluetooth LE Espruino boards) the bluetooth stack can get in the way. Before
version 2v18 of Espruino OneWire could be unreliable, but as of firmware 2v18
Espruino now schedules OneWire accesses with the bluetooth stack to ensure it doesn't interfere.
OneWire is now reliable but some functions such as OneWire.search
can now take
a while to execute (around 1 second).
Methods and Fields
- constructor OneWire(pin)
- function OneWire.read(count)
- function OneWire.reset()
- function OneWire.search(command)
- function OneWire.select(rom)
- function OneWire.skip()
- function OneWire.write(data, power)
constructor OneWire ⇒
Call type:
new OneWire(pin)
Parameters
pin
- The pin to implement OneWire on
Returns
A OneWire object
Description
Create a software OneWire implementation on the given pin
function OneWire.read ⇒
Call type:
function OneWire.read(count)
Parameters
count
- [optional] The amount of bytes to read
Returns
The byte that was read, or a Uint8Array if count was specified and >=0
Description
Read a byte
function OneWire.reset ⇒
Call type:
function OneWire.reset()
Returns
True is a device was present (it held the bus low)
Description
Perform a reset cycle
function OneWire.search ⇒
Call type:
function OneWire.search(command)
Parameters
command
- (Optional) command byte. If not specified (or zero), this defaults to 0xF0. This can could be set to 0xEC to perform a DS18B20 'Alarm Search Command'
Returns
An array of devices that were found
Description
Search for devices
function OneWire.select ⇒
Call type:
function OneWire.select(rom)
Parameters
rom
- The device to select (get this using OneWire.search()
)
Description
Select a ROM - always performs a reset first
function OneWire.skip ⇒
Call type:
function OneWire.skip()
Description
Skip a ROM
function OneWire.write ⇒
Call type:
function OneWire.write(data, power)
Parameters
data
- A byte (or array of bytes) to write
power
- Whether to leave power on after write (default is false)
Description
Write one or more bytes
Pin Class
This is the built-in class for Pins, such as D0,D1,LED1, or BTN
You can call the methods on Pin, or you can use Wiring-style functions such as digitalWrite
Methods and Fields
- function Pin.analog()
- function Pin.getInfo()
- function Pin.getMode()
- function Pin.mode(mode)
- Pin.Pin()
- constructor Pin(value)
- function Pin.pulse(value, time)
- function Pin.pwm(value, options)
- function Pin.read()
- function Pin.reset()
- function Pin.set()
- function Pin.toggle()
- function Pin.write(value)
- function Pin.writeAtTime(value, time)
function Pin.analog ⇒
Call type:
function Pin.analog()
Returns
The analog Value of the Pin between 0 and 1
Description
(Added in 2v20) Get the analogue value of the given pin. See analogRead
for more information.
function Pin.getInfo ⇒
Call type:
function Pin.getInfo()
Returns
An object containing information about this pins
Description
Get information about this pin and its capabilities. Of the form:
{
"port" : "A", // the Pin's port on the chip
"num" : 12, // the Pin's number
"in_addr" : 0x..., // (if available) the address of the pin's input address in bit-banded memory (can be used with peek)
"out_addr" : 0x..., // (if available) the address of the pin's output address in bit-banded memory (can be used with poke)
"analog" : { ADCs : [1], channel : 12 }, // If analog input is available
"functions" : {
"TIM1":{type:"CH1, af:0},
"I2C3":{type:"SCL", af:1}
}
}
Will return undefined if pin is not valid.
Note: This is not available in devices with low flash memory
function Pin.getMode ⇒
Call type:
function Pin.getMode()
Returns
The pin mode, as a string
Description
Return the current mode of the given pin. See pinMode
for more information.
function Pin.mode ⇒
Call type:
function Pin.mode(mode)
Parameters
mode
- The mode - a string that is either 'analog', 'input', 'inputpullup', 'inputpulldown', 'output', 'opendrain', 'afoutput' or 'afopendrain'. Do not include this argument if you want to revert to automatic pin mode setting.
Description
Pin.Pin ⇒
Call type:
Pin.Pin()
Description
This is the built-in class for Pins, such as D0,D1,LED1, or BTN
You can call the methods on Pin, or you can use Wiring-style functions such as digitalWrite
constructor Pin ⇒
Call type:
new Pin(value)
Parameters
value
- A value to be converted to a pin. Can be a number, pin, or String.
Returns
A Pin object
Description
Creates a pin from the given argument (or returns undefined if no argument)
function Pin.pulse ⇒
Call type:
function Pin.pulse(value, time)
Parameters
value
- Whether to pulse high (true) or low (false)
time
- A time in milliseconds, or an array of times (in which case a square wave will be output starting with a pulse of 'value')
Description
(Added in 2v20) Pulse the pin with the value for the given time in milliseconds.
LED.pulse(1, 100); // pulse LED on for 100ms
LED.pulse(1, [100,1000,100]); // pulse LED on for 100ms, off for 1s, on for 100ms
This is identical to digitalPulse
.
function Pin.pwm ⇒
Call type:
function Pin.pwm(value, options)
Parameters
value
- A value between 0 and 1
options
- An object containing options for analog output - see below
Description
(Added in 2v20) Set the analog Value of a pin. It will be output using PWM.
See analogWrite
for more information.
Objects can contain:
freq
- pulse frequency in Hz, e.g.analogWrite(A0,0.5,{ freq : 10 });
- specifying a frequency will force PWM output, even if the pin has a DACsoft
- boolean, If true software PWM is used if hardware is not available.forceSoft
- boolean, If true software PWM is used even if hardware PWM or a DAC is available
function Pin.read ⇒
Call type:
function Pin.read()
Returns
Whether pin is a logical 1 or 0
Description
Returns the input state of the pin as a boolean.
Note: if you didn't call pinMode
beforehand then this function will also
reset the pin's state to "input"
function Pin.reset ⇒
Call type:
function Pin.reset()
Description
Sets the output state of the pin to a 0
Note: if you didn't call pinMode
beforehand then this function will also
reset the pin's state to "output"
function Pin.set ⇒
Call type:
function Pin.set()
Description
Sets the output state of the pin to a 1
Note: if you didn't call pinMode
beforehand then this function will also
reset the pin's state to "output"
function Pin.toggle ⇒
Call type:
function Pin.toggle()
Returns
True if the pin is high after calling the function
Description
Toggles the state of the pin from off to on, or from on to off.
Note: This method doesn't currently work on the ESP8266 port of Espruino.
Note: if you didn't call pinMode
beforehand then this function will also
reset the pin's state to "output"
function Pin.write ⇒
Call type:
function Pin.write(value)
Parameters
value
- Whether to set output high (true/1) or low (false/0)
Description
Sets the output state of the pin to the parameter given
Note: if you didn't call pinMode
beforehand then this function will also
reset the pin's state to "output"
function Pin.writeAtTime ⇒
Call type:
function Pin.writeAtTime(value, time)
Parameters
value
- Whether to set output high (true/1) or low (false/0)
time
- Time at which to write
Description
Sets the output state of the pin to the parameter given at the specified time.
Note:* this *doesn't change the mode of the pin to an output. To do that,
you need to use pin.write(0)
or pinMode(pin, 'output')
first.
Note: This is not available in devices with low flash memory
Pixl Class
Class containing utility functions for Pixl.js
Methods and Fields
Pixl.getBatteryPercentage ⇒
Call type:
Pixl.getBatteryPercentage()
Returns
A percentage between 0 and 100
Description
DEPRECATED - Please use E.getBattery()
instead.
Return an approximate battery percentage remaining based on a normal CR2032 battery (2.8 - 2.2v)
Pixl.lcdw ⇒
Call type:
Pixl.lcdw(c)
Parameters
c
-
Description
Writes a command directly to the ST7567 LCD controller
Pixl.menu ⇒
Call type:
Pixl.menu(menu)
Parameters
menu
- An object containing name->function mappings to to be used in a menu
Returns
A menu object with draw
, move
and select
functions
Description
Display a menu on Pixl.js's screen, and set up the buttons to navigate through it.
DEPRECATED: Use E.showMenu
Pixl.setContrast ⇒
Call type:
Pixl.setContrast(c)
Parameters
c
- Contrast between 0 and 1
Description
Set the LCD's contrast
Pixl.setLCDPower ⇒
Call type:
Pixl.setLCDPower(isOn)
Parameters
isOn
- True if the LCD should be on, false if not
Description
This function can be used to turn Pixl.js's LCD off or on.
- With the LCD off, Pixl.js draws around 0.1mA
- With the LCD on, Pixl.js draws around 0.25mA
process Class
This class contains information about Espruino itself
Methods and Fields
process.env ⇒
Call type:
process.env
Returns
An object
Description
Returns an Object containing various pre-defined variables.
VERSION
- is the Espruino versionGIT_COMMIT
- is Git commit hash this firmware was built fromBOARD
- the board's ID (e.g.PUCKJS
)RAM
- total amount of on-chip RAM in bytesFLASH
- total amount of on-chip flash memory in bytesSPIFLASH
- (on Bangle.js) total amount of off-chip flash memory in bytesHWVERSION
- For Puck.js this is the board revision (1, 2, 2.1), or for Bangle.js it's 1 or 2STORAGE
- memory in bytes dedicated to theStorage
moduleSERIAL
- the serial number of this chipCONSOLE
- the name of the current console device being used (Serial1
,USB
,Bluetooth
, etc)MODULES
- a list of built-in modules separated by commasEXPTR
- The address of theexportPtrs
structure in flash (this includes links to built-in functions that compiled JS code needs)APP_RAM_BASE
- On nRF5x boards, this is the RAM required by the Softdevice if it doesn't exactly match what was allocated. You can use this to updateLD_APP_RAM_BASE
in theBOARD.py
file
For example, to get a list of built-in modules, you can use
process.env.MODULES.split(',')
Note: process.env
is not writeable - so as not to waste RAM, the contents
are generated on demand. If you need to be able to change them, use process.env=process.env;
first to ensure the values stay allocated.
process.memory ⇒
Call type:
process.memory(gc)
Parameters
gc
- [optional] A boolean. If undefined
or true
Garbage collection is performed, if false
it is not
Returns
Information about memory usage
Description
Run a Garbage Collection pass, and return an object containing information on memory usage.
free
: Memory that is available to be used (in blocks)usage
: Memory that has been used (in blocks)total
: Total memory (in blocks)history
: Memory used for command history - that is freed if memory is low. Note that this is INCLUDED in the figure for 'free'gc
: Memory freed during the GC passgctime
: Time taken for GC pass (in milliseconds)blocksize
: Size of a block (variable) in bytesstackEndAddress
: (on ARM) the address (that can be used with peek/poke/etc) of the END of the stack. The stack grows down, so unless you do a lot of recursion the bytes above this can be used.stackFree
: (on ARM) how many bytes of free execution stack are there at the point of execution.flash_start
: (on ARM) the address of the start of flash memory (usually0x8000000
)flash_binary_end
: (on ARM) the address in flash memory of the end of Espruino's firmware.flash_code_start
: (on ARM) the address in flash memory of pages that store any code that you save withsave()
.flash_length
: (on ARM) the amount of flash memory this firmware was built for (in bytes). Note: Some STM32 chips actually have more memory than is advertised.
Memory units are specified in 'blocks', which are around 16 bytes each
(depending on your device). The actual size is available in blocksize
. See
http://www.espruino.com/Performance for more information.
Note: To find free areas of flash memory, see require('Flash').getFree()
event process.uncaughtException ⇒
Call type:
process.on('uncaughtException', function(exception) { ... });
Parameters
exception
- The uncaught exception
Description
This event is called when an exception gets thrown and isn't caught (e.g. it gets all the way back to the event loop).
You can use this for logging potential problems that might occur during execution when you might not be able to see what is written to the console, for example:
var lastError;
process.on('uncaughtException', function(e) {
lastError=e;
print(e,e.stack?"\n"+e.stack:"")
});
function checkError() {
if (!lastError) return print("No Error");
print(lastError,lastError.stack?"\n"+lastError.stack:"")
}
Note: When this is used, exceptions will cease to be reported on the console - which may make debugging difficult!
process.version ⇒
Call type:
process.version
Returns
The version of Espruino
Description
Returns the version of Espruino as a String
Promise Class
This is the built-in class for ES6 Promises
Methods and Fields
- Promise.all(promises)
- function Promise.catch(onRejected)
- constructor Promise(executor)
- Promise.reject(promises)
- Promise.resolve(promises)
- function Promise.then(onFulfilled, onRejected)
Promise.all ⇒
Call type:
Promise.all(promises)
Parameters
promises
- An array of promises
Returns
A new Promise
Description
Return a new promise that is resolved when all promises in the supplied array are resolved.
Note: This is not available in devices with low flash memory
function Promise.catch ⇒
Call type:
function Promise.catch(onRejected)
Parameters
onRejected
- A callback that is called when this promise is rejected
Returns
The original Promise
constructor Promise ⇒
Call type:
new Promise(executor)
Parameters
executor
- A function of the form function (resolve, reject)
Returns
A Promise
Description
Create a new Promise. The executor function is executed immediately (before the constructor even returns) and
Note: This is not available in devices with low flash memory
Promise.reject ⇒
Call type:
Promise.reject(promises)
Parameters
promises
- Data to pass to the .catch
handler
Returns
A new Promise
Description
Return a new promise that is already rejected (at idle it'll call .catch
)
Note: This is not available in devices with low flash memory
Promise.resolve ⇒
Call type:
Promise.resolve(promises)
Parameters
promises
- Data to pass to the .then
handler
Returns
A new Promise
Description
Return a new promise that is already resolved (at idle it'll call .then
)
Note: This is not available in devices with low flash memory
function Promise.then ⇒
Call type:
function Promise.then(onFulfilled, onRejected)
Parameters
onFulfilled
- A callback that is called when this promise is resolved
onRejected
- [optional] A callback that is called when this promise is rejected (or nothing)
Returns
The original Promise
Puck Class
Class containing Puck.js's utility functions.
Methods and Fields
- event Puck.accel()
- Puck.accel()
- Puck.accelOff()
- Puck.accelOn(samplerate)
- Puck.accelRd(reg)
- Puck.accelWr(reg, data)
- Puck.capSense(tx, rx)
- Puck.getBatteryPercentage()
- Puck.getTemperature()
- Puck.IR(data, cathode, anode)
- Puck.light()
- Puck.mag()
- event Puck.mag()
- Puck.magOff()
- Puck.magOn(samplerate)
- Puck.magRd(reg)
- Puck.magTemp()
- Puck.magWr(reg, data)
- Puck.selfTest()
event Puck.accel ⇒
Call type:
Puck.on('accel', function() { ... });
Description
Only on Puck.js v2.0
Called after Puck.accelOn()
every time accelerometer data is sampled. There is
one argument which is an object of the form {acc:{x,y,z}, gyro:{x,y,z}}
containing the data.
The data is as it comes off the accelerometer and is not scaled to 1g. For more
information see Puck.accel()
or the Puck.js page on the
magnetometer.
Note: This is only available in Puck.js devices
Puck.accel ⇒
Call type:
Puck.accel()
Returns
An Object {acc:{x,y,z}, gyro:{x,y,z}}
of accelerometer/gyro readings
Description
Turn on the accelerometer, take a single reading, and then turn it off again.
The values reported are the raw values from the chip. In normal configuration:
- accelerometer: full-scale (32768) is 4g, so you need to divide by 8192 to get correctly scaled values
- gyro: full-scale (32768) is 245 dps, so you need to divide by 134 to get correctly scaled values
If taking more than one reading, we'd suggest you use Puck.accelOn()
and the
Puck.accel
event.
Note: This is only available in Puck.js devices
Puck.accelOff ⇒
Call type:
Puck.accelOff()
Description
Turn the accelerometer off after it has been turned on by Puck.accelOn()
.
Check out the Puck.js page on the accelerometer for more information.
Note: This is only available in Puck.js devices
Puck.accelOn ⇒
Call type:
Puck.accelOn(samplerate)
Parameters
samplerate
- The sample rate in Hz, or undefined
(default is 12.5 Hz)
Description
Accepted values are:
- 1.6 Hz (no Gyro) - 40uA (2v05 and later firmware)
- 12.5 Hz (with Gyro)- 350uA
- 26 Hz (with Gyro) - 450 uA
- 52 Hz (with Gyro) - 600 uA
- 104 Hz (with Gyro) - 900 uA
- 208 Hz (with Gyro) - 1500 uA
- 416 Hz (with Gyro) (not recommended)
- 833 Hz (with Gyro) (not recommended)
- 1660 Hz (with Gyro) (not recommended)
Once Puck.accelOn()
is called, the Puck.accel
event will be called each time
data is received. Puck.accelOff()
can be called to turn the accelerometer off.
For instance to light the red LED whenever Puck.js is face up:
Puck.on('accel', function(a) {
digitalWrite(LED1, a.acc.z > 0);
});
Puck.accelOn();
Check out the Puck.js page on the accelerometer for more information.
Note: Puck.js cannot currently read every sample from the accelerometer at sample rates above 208Hz.
Note: This is only available in Puck.js devices
Puck.accelRd ⇒
Call type:
Puck.accelRd(reg)
Parameters
reg
-
Returns
See description above
Description
Reads a register from the LSM6DS3TR-C Accelerometer. Can be used for configuring advanced functions.
Check out the Puck.js page on the accelerometer for more information and links to modules that use this function.
Note: This is only available in Puck.js devices
Puck.accelWr ⇒
Call type:
Puck.accelWr(reg, data)
Parameters
reg
-
data
-
Description
Writes a register on the LSM6DS3TR-C Accelerometer. Can be used for configuring advanced functions.
Check out the Puck.js page on the accelerometer for more information and links to modules that use this function.
Note: This is only available in Puck.js devices
Puck.capSense ⇒
Call type:
Puck.capSense(tx, rx)
Parameters
tx
-
rx
-
Returns
Capacitive sense counter
Description
Capacitive sense - the higher the capacitance, the higher the number returned.
If called without arguments, a value depending on the capacitance of what is attached to pin D11 will be returned. If you attach a length of wire to D11, you'll be able to see a higher value returned when your hand is near the wire than when it is away.
You can also supply pins to use yourself, however if you do this then the TX pin must be connected to RX pin and sense plate via a roughly 1MOhm resistor.
When not supplying pins, Puck.js uses an internal resistor between D12(tx) and D11(rx).
Note: This is only available in Puck.js devices
Puck.getBatteryPercentage ⇒
Call type:
Puck.getBatteryPercentage()
Returns
A percentage between 0 and 100
Description
DEPRECATED - Please use E.getBattery()
instead.
Return an approximate battery percentage remaining based on a normal CR2032 battery (2.8 - 2.2v).
Note: This is only available in Puck.js devices
Puck.getTemperature ⇒
Call type:
Puck.getTemperature()
Returns
Temperature in degrees C
Description
On Puck.js v2.0 this will use the on-board PCT2075TP temperature sensor, but on Puck.js the less accurate on-chip Temperature sensor is used.
Note: This is only available in Puck.js devices
Puck.IR ⇒
Call type:
Puck.IR(data, cathode, anode)
Parameters
data
- An array of pulse lengths, in milliseconds
cathode
- [optional] pin to use for IR LED cathode - if not defined, the built-in IR LED is used
anode
- [optional] pin to use for IR LED anode - if not defined, the built-in IR LED is used
Description
Transmit the given set of IR pulses - data should be an array of pulse times in
milliseconds (as [on, off, on, off, on, etc]
).
For example Puck.IR(pulseTimes)
- see http://www.espruino.com/Puck.js+Infrared
for a full example.
You can also attach an external LED to Puck.js, in which case you can just
execute Puck.IR(pulseTimes, led_cathode, led_anode)
It is also possible to just supply a single pin for IR transmission with
Puck.IR(pulseTimes, led_anode)
(on 2v05 and above).
Note: This is only available in Puck.js devices
Puck.light ⇒
Call type:
Puck.light()
Returns
A light value from 0 to 1
Description
Return a light value based on the light the red LED is seeing.
Note: If called more than 5 times per second, the received light value may not be accurate.
Note: This is only available in Puck.js devices
Puck.mag ⇒
Call type:
Puck.mag()
Returns
An Object {x,y,z}
of magnetometer readings as integers
Description
Turn on the magnetometer, take a single reading, and then turn it off again.
An object of the form {x,y,z}
is returned containing magnetometer readings.
Due to residual magnetism in the Puck and magnetometer itself, with no magnetic
field the Puck will not return {x:0,y:0,z:0}
.
Instead, it's up to you to figure out what the 'zero value' is for your Puck in your location and to then subtract that from the value returned. If you're not trying to measure the Earth's magnetic field then it's a good idea to just take a reading at startup and use that.
With the aerial at the top of the board, the y
reading is vertical, x
is
horizontal, and z
is through the board.
Readings are in increments of 0.1 micro Tesla (uT). The Earth's magnetic field varies from around 25-60 uT, so the reading will vary by 250 to 600 depending on location.
Note: This is only available in Puck.js devices
event Puck.mag ⇒
Call type:
Puck.on('mag', function() { ... });
Description
Called after Puck.magOn()
every time magnetometer data is sampled. There is
one argument which is an object of the form {x,y,z}
containing magnetometer
readings as integers (for more information see Puck.mag()
).
Check out the Puck.js page on the magnetometer for more information.
Note: This is only available in Puck.js devices
Puck.magOff ⇒
Call type:
Puck.magOff()
Description
Turn the magnetometer off
Note: This is only available in Puck.js devices
Puck.magOn ⇒
Call type:
Puck.magOn(samplerate)
Parameters
samplerate
- The sample rate in Hz, or undefined
Description
Turn the magnetometer on and start periodic sampling. Samples will then cause a 'mag' event on 'Puck':
Puck.magOn();
Puck.on('mag', function(xyz) {
console.log(xyz);
// {x:..., y:..., z:...}
});
// Turn events off with Puck.magOff();
This call will be ignored if the sampling is already on.
If given an argument, the sample rate is set (if not, it's at 0.63 Hz). The sample rate must be one of the following (resulting in the given power consumption):
- 80 Hz - 900uA
- 40 Hz - 550uA
- 20 Hz - 275uA
- 10 Hz - 137uA
- 5 Hz - 69uA
- 2.5 Hz - 34uA
- 1.25 Hz - 17uA
- 0.63 Hz - 8uA
- 0.31 Hz - 8uA
- 0.16 Hz - 8uA
- 0.08 Hz - 8uA
When the battery level drops too low while sampling is turned on, the magnetometer may stop sampling without warning, even while other Puck functions continue uninterrupted.
Check out the Puck.js page on the magnetometer for more information.
Note: This is only available in Puck.js devices
Puck.magRd ⇒
Call type:
Puck.magRd(reg)
Parameters
reg
-
Returns
See description above
Description
Reads a register from the LIS3MDL / MAX3110 Magnetometer. Can be used for configuring advanced functions.
Check out the Puck.js page on the magnetometer for more information and links to modules that use this function.
Note: This is only available in Puck.js devices
Puck.magTemp ⇒
Call type:
Puck.magTemp()
Returns
Temperature in degrees C
Description
Turn on the magnetometer, take a single temperature reading from the MAG3110 chip, and then turn it off again.
(If the magnetometer is already on, this just returns the last reading obtained)
E.getTemperature()
uses the microcontroller's temperature sensor, but this
uses the magnetometer's.
The reading obtained is an integer (so no decimal places), but the sensitivity is factory trimmed. to 1°C, however the temperature offset isn't - so absolute readings may still need calibrating.
Note: This is only available in Puck.js devices
Puck.magWr ⇒
Call type:
Puck.magWr(reg, data)
Parameters
reg
-
data
-
Description
Writes a register on the LIS3MDL / MAX3110 Magnetometer. Can be used for configuring advanced functions.
Check out the Puck.js page on the magnetometer for more information and links to modules that use this function.
Note: This is only available in Puck.js devices
Puck.selfTest ⇒
Call type:
Puck.selfTest()
Returns
True if the self-test passed
Description
Run a self-test, and return true for a pass. This checks for shorts between pins, so your Puck shouldn't have anything connected to it.
Note: This self-test auto starts if you hold the button on your Puck down while inserting the battery, leave it pressed for 3 seconds (while the green LED is lit) and release it soon after all LEDs turn on. 5 red blinks is a fail, 5 green is a pass.
If the self test fails, it'll set the Puck.js Bluetooth advertising name to
Puck.js !ERR
where ERR is a 3 letter error code.
Note: This is only available in Puck.js devices
Qwiic Class
Class containing utility functions for the Qwiic connectors on the Jolt.js Smart Bluetooth driver.
Each class (available from Jolt.Q0
/Jolt.Q1
/Jolt.Q2
/Jolt.Q3
)
has sda
and scl
fields with the pins for SDA and SCL on them.
On Jolt.js, the four Qwiic connectors can be individually powered:
- Q0/Q1 - GND is switched with a 500mA FET. The
fet
field contains the pin that controls the FET - Q2/Q3 - all 4 pins are connected to GPIO.
gnd
andvcc
fields contain the pins for GND and VCC
To control the power, use Qwiic.setPower
, for example: Jolt.Q0.setPower(true)
Methods and Fields
property Qwiic.i2c ⇒
Call type:
property Qwiic.i2c
Returns
An I2C object using this Qwiic connector, already set up
function Qwiic.setPower ⇒
Call type:
function Qwiic.setPower(isOn)
Parameters
isOn
- Whether the Qwiic connector is to be on or not
Returns
The same Qwiic object (for call chaining)
Description
This turns power for the given Qwiic connector on or off. See Qwiic
for more information.
ReferenceError Class
The base class for reference errors - where a variable which doesn't exist has been accessed.
Methods and Fields
constructor ReferenceError ⇒
Call type:
new ReferenceError(message)
Parameters
message
- [optional] An message string
Returns
A ReferenceError object
Description
Creates a ReferenceError object
function ReferenceError.toString ⇒
Call type:
function ReferenceError.toString()
Returns
A String
RegExp Class
The built-in class for handling Regular Expressions
Note: Espruino's regular expression parser does not contain all the features present in a full ES6 JS engine. However it does contain support for the all the basics.
Methods and Fields
function RegExp.exec ⇒
Call type:
function RegExp.exec(str)
Parameters
str
- A string to match on
Returns
A result array, or null
Description
Test this regex on a string - returns a result array on success, or null
otherwise.
/Wo/.exec("Hello World")
will return:
[
"Wo",
"index": 6,
"input": "Hello World"
]
Or with groups /W(o)rld/.exec("Hello World")
returns:
[
"World",
"o", "index": 6,
"input": "Hello World"
]
Note: This is not available in devices with low flash memory
constructor RegExp ⇒
Call type:
new RegExp(regex, flags)
Parameters
regex
- A regular expression as a string
flags
- Flags for the regular expression as a string
Returns
A RegExp object
Description
Creates a RegExp object, for handling Regular Expressions
Note: This is not available in devices with low flash memory
function RegExp.test ⇒
Call type:
function RegExp.test(str)
Parameters
str
- A string to match on
Returns
true for a match, or false
Description
Test this regex on a string - returns true
on a successful match, or false
otherwise
Note: This is not available in devices with low flash memory
Serial Class
This class allows use of the built-in USARTs
Methods may be called on the USB
, Serial1
, Serial2
, Serial3
, Serial4
,
Serial5
and Serial6
objects. While different processors provide different
numbers of USARTs, on official Espruino boards you can always rely on at least
Serial1
being available
Instances
Bluetooth
The Bluetooth Serial port - used when data is sent or received over BluetoothLoopbackA
A loopback serial device. Data sent toLoopbackA
comes out ofLoopbackB
andLoopbackB
A loopback serial device. Data sent toLoopbackA
comes out ofLoopbackB
andSerial1
The first Serial (USART) portSerial2
The second Serial (USART) portSerial3
The third Serial (USART) portSerial4
The fourth Serial (USART) portSerial5
The fifth Serial (USART) portSerial6
The sixth Serial (USART) portTelnet
A telnet serial device that maps to the built-in telnet console server (devicesTerminal
A simple VT100 terminal emulator.USB
The USB Serial port
Methods and Fields
- function Serial.available()
- event Serial.data(data)
- Serial.find(pin)
- function Serial.flush()
- event Serial.framing()
- function Serial.inject(data, ...)
- event Serial.parity()
- function Serial.pipe(destination, options)
- function Serial.print(string)
- function Serial.println(string)
- function Serial.read(chars)
- constructor Serial()
- function Serial.setConsole(force)
- function Serial.setup(baudrate, options)
- function Serial.unsetup()
- function Serial.write(data, ...)
function Serial.available ⇒
Call type:
function Serial.available()
Returns
How many bytes are available
Description
Return how many bytes are available to read. If there is already a listener for data, this will always return 0.
event Serial.data ⇒
Call type:
Serial.on('data', function(data) { ... });
Parameters
data
- A string containing one or more characters of received data
Description
The data
event is called when data is received. If a handler is defined with
X.on('data', function(data) { ... })
then it will be called, otherwise data
will be stored in an internal buffer, where it can be retrieved with X.read()
Serial.find ⇒
Call type:
Serial.find(pin)
Parameters
pin
- A pin to search with
Returns
An object of type Serial
, or undefined
if one couldn't be found.
Description
Try and find a USART (Serial) hardware device that will work on this pin (e.g.
Serial1
)
May return undefined if no device can be found.
function Serial.flush ⇒
Call type:
function Serial.flush()
Description
Flush this serial stream (pause execution until all data has been sent)
Note: This is not available in devices with low flash memory
event Serial.framing ⇒
Call type:
Serial.on('framing', function() { ... });
Description
The framing
event is called when there was activity on the input to the UART
but the STOP
bit wasn't in the correct place. This is either because there was
noise on the line, or the line has been pulled to 0 for a long period of time.
To enable this, you must initialise Serial with
SerialX.setup(..., { ...,
errors:true });
Note: Even though there was an error, the byte will still be received and
passed to the data
handler.
Note: This only works on STM32 and NRF52 based devices (e.g. all official Espruino boards)
function Serial.inject ⇒
Call type:
function Serial.inject(data, ...)
Parameters
data, ...
- One or more items to write. May be ints, strings, arrays, or special objects (see E.toUint8Array
for more info).
Description
Add data to this device as if it came directly from the input - it will be
returned via serial.on('data', ...)
;
Serial1.on('data', function(d) { print("Got",d); });
Serial1.inject('Hello World');
// prints "Got Hel","Got lo World" (characters can be split over multiple callbacks)
This is most useful if you wish to send characters to Espruino's REPL (console) while it is on another device.
Note: This is not available in devices with low flash memory
event Serial.parity ⇒
Call type:
Serial.on('parity', function() { ... });
Description
The parity
event is called when the UART was configured with a parity bit, and
this doesn't match the bits that have actually been received.
To enable this, you must initialise Serial with
SerialX.setup(..., { ...,
errors:true });
Note: Even though there was an error, the byte will still be received and
passed to the data
handler.
Note: This only works on STM32 and NRF52 based devices (e.g. all official Espruino boards)
function Serial.pipe ⇒
Call type:
function Serial.pipe(destination, options)
Parameters
destination
- The destination file/stream that will receive content from the source.
options
- [optional] An object { chunkSize : int=32, end : bool=true, complete : function }
chunkSize : The amount of data to pipe from source to destination at a time
complete : a function to call when the pipe activity is complete
end : call the 'end' function on the destination when the source is finished
Description
Pipe this USART to a stream (an object with a 'write' method)
Note: This is not available in devices with low flash memory
function Serial.print ⇒
Call type:
function Serial.print(string)
Parameters
string
- A String to print
Description
Print a string to the serial port - without a line feed
Note: This function replaces any occurrences of \n
in the string with
\r\n
. To avoid this, use Serial.write
.
function Serial.println ⇒
Call type:
function Serial.println(string)
Parameters
string
- A String to print
Description
Print a line to the serial port with a newline (\r\n
) at the end of it.
Note: This function converts data to a string first, e.g.
Serial.print([1,2,3])
is equivalent to
Serial.print("1,2,3"). If you'd like
to write raw bytes, use
Serial.write`.
function Serial.read ⇒
Call type:
function Serial.read(chars)
Parameters
chars
- The number of characters to read, or undefined/0 for all available
Returns
A string containing the required bytes.
Description
Return a string containing characters that have been received
constructor Serial ⇒
Call type:
new Serial()
Returns
A Serial object
Description
Create a software Serial port. This has limited functionality (only low baud rates), but it can work on any pins.
Use Serial.setup
to configure this port.
function Serial.setConsole ⇒
Call type:
function Serial.setConsole(force)
Parameters
force
- Whether to force the console to this port
Description
Set this Serial port as the port for the JavaScript console (REPL).
Unless force
is set to true, changes in the connection state of the board (for
instance plugging in USB) will cause the console to change.
See E.setConsole
for a more flexible version of this function.
function Serial.setup ⇒
Call type:
function Serial.setup(baudrate, options)
Parameters
baudrate
- The baud rate - the default is 9600
options
- [optional] A structure containing extra information on initialising the serial port - see below.
Description
Setup this Serial port with the given baud rate and options.
e.g.
Serial1.setup(9600,{rx:a_pin, tx:a_pin});
The second argument can contain:
{
rx:pin, // Receive pin (data in to Espruino)
tx:pin, // Transmit pin (data out of Espruino)
ck:pin, // (default none) Clock Pin
cts:pin, // (default none) Clear to Send Pin
bytesize:8, // (default 8)How many data bits - 7 or 8
parity:null/'none'/'o'/'odd'/'e'/'even',
// (default none) Parity bit
stopbits:1, // (default 1) Number of stop bits to use
flow:null/undefined/'none'/'xon', // (default none) software flow control
path:null/undefined/string // Linux Only - the path to the Serial device to use
errors:false // (default false) whether to forward framing/parity errors
}
You can find out which pins to use by looking at your board's reference
page and searching for pins with the UART
/USART
markers.
If not specified in options, the default pins are used for rx and tx (usually
the lowest numbered pins on the lowest port that supports this peripheral). ck
and cts
are not used unless specified.
Note that even after changing the RX and TX pins, if you have called setup
before then the previous RX and TX pins will still be connected to the Serial
port as well - until you set them to something else using digitalWrite
or
pinMode
.
Flow control can be xOn/xOff (flow:'xon'
) or hardware flow control (receive
only) if cts
is specified. If cts
is set to a pin, the pin's value will be 0
when Espruino is ready for data and 1 when it isn't.
By default, framing or parity errors don't create framing
or parity
events
on the Serial
object because storing these errors uses up additional storage
in the queue. If you're intending to receive a lot of malformed data then the
queue might overflow E.getErrorFlags()
would return FIFO_FULL
. However if
you need to respond to framing
or parity
errors then you'll need to use
errors:true
when initialising serial.
On Linux builds there is no default Serial device, so you must specify a path to
a device - for instance: Serial1.setup(9600,{path:"/dev/ttyACM0"})
You can also set up 'software serial' using code like:
var s = new Serial();
s.setup(9600,{rx:a_pin, tx:a_pin});
However software serial doesn't use ck
, cts
, parity
, flow
or errors
parts of the initialisation object.
function Serial.unsetup ⇒
Call type:
function Serial.unsetup()
Description
If the serial (or software serial) device was set up, uninitialise it.
Note: This is not available in devices with low flash memory
function Serial.write ⇒
Call type:
function Serial.write(data, ...)
Parameters
data, ...
- One or more items to write. May be ints, strings, arrays, or special objects (see E.toUint8Array
for more info).
Description
Write a character or array of data to the serial port
This method writes unmodified data, e.g. Serial.write([1,2,3])
is equivalent to
Serial.write("\1\2\3")
. If you'd like data converted to a string first, use
Serial.print
.
Server Class
The socket server created by require('net').createServer
Methods and Fields
function Server.close ⇒
Call type:
function Server.close()
Description
Stop listening for new connections
function Server.listen ⇒
Call type:
function Server.listen(port)
Parameters
port
- The port to listen on
Returns
The HTTP server instance that 'listen' was called on
Description
Start listening for new connections on the given port
Socket Class
An actual socket connection - allowing transmit/receive of TCP data
Methods and Fields
- function Socket.available()
- event Socket.close(had_error)
- event Socket.data(data)
- event Socket.drain()
- function Socket.end(data)
- event Socket.error(details)
- function Socket.pipe(destination, options)
- function Socket.read(chars)
- function Socket.write(data)
function Socket.available ⇒
Call type:
function Socket.available()
Returns
How many bytes are available
Description
Return how many bytes are available to read. If there is already a listener for data, this will always return 0.
event Socket.close ⇒
Call type:
Socket.on('close', function(had_error) { ... });
Parameters
had_error
- A boolean indicating whether the connection had an error (use an error event handler to get error details).
Description
Called when the connection closes.
event Socket.data ⇒
Call type:
Socket.on('data', function(data) { ... });
Parameters
data
- A string containing one or more characters of received data
Description
The 'data' event is called when data is received. If a handler is defined with
X.on('data', function(data) { ... })
then it will be called, otherwise data
will be stored in an internal buffer, where it can be retrieved with X.read()
event Socket.drain ⇒
Call type:
Socket.on('drain', function() { ... });
Description
An event that is fired when the buffer is empty and it can accept more data to send.
function Socket.end ⇒
Call type:
function Socket.end(data)
Parameters
data
- A string containing data to send
Description
Close this socket - optional data to append as an argument.
See Socket.write
for more information about the data argument
event Socket.error ⇒
Call type:
Socket.on('error', function(details) { ... });
Parameters
details
- An error object with an error code (a negative integer) and a message.
Description
There was an error on this socket and it is closing (or wasn't opened in the first place). If a "connected" event was issued on this socket then the error event is always followed by a close event. The error codes are:
- -1: socket closed (this is not really an error and will not cause an error callback)
- -2: out of memory (typically while allocating a buffer to hold data)
- -3: timeout
- -4: no route
- -5: busy
- -6: not found (DNS resolution)
- -7: max sockets (... exceeded)
- -8: unsent data (some data could not be sent)
- -9: connection reset (or refused)
- -10: unknown error
- -11: no connection
- -12: bad argument
- -13: SSL handshake failed
- -14: invalid SSL data
function Socket.pipe ⇒
Call type:
function Socket.pipe(destination, options)
Parameters
destination
- The destination file/stream that will receive content from the source.
options
- [optional] An object { chunkSize : int=32, end : bool=true, complete : function }
chunkSize : The amount of data to pipe from source to destination at a time
complete : a function to call when the pipe activity is complete
end : call the 'end' function on the destination when the source is finished
Description
Pipe this to a stream (an object with a 'write' method)
Note: This is not available in devices with low flash memory
function Socket.read ⇒
Call type:
function Socket.read(chars)
Parameters
chars
- The number of characters to read, or undefined/0 for all available
Returns
A string containing the required bytes.
Description
Return a string containing characters that have been received
function Socket.write ⇒
Call type:
function Socket.write(data)
Parameters
data
- A string containing data to send
Returns
For node.js compatibility, returns the boolean false. When the send buffer is empty, a drain
event will be sent
Description
This function writes the data
argument as a string. Data that is passed in
(including arrays) will be converted to a string with the normal JavaScript
toString
method.
If you wish to send binary data then you need to convert that data directly to a
String. This can be done with String.fromCharCode
, however it's often easier
and faster to use the Espruino-specific E.toString
, which will read its
arguments as an array of bytes and convert that to a String:
socket.write(E.toString([0,1,2,3,4,5]));
If you need to send something other than bytes, you can use 'Typed Arrays', or
even DataView
:
var d = new DataView(new ArrayBuffer(8)); // 8 byte array buffer
d.setFloat32(0, 765.3532564); // write float at bytes 0-3
d.setInt8(4, 42); // write int8 at byte 4
socket.write(E.toString(d.buffer))
SPI Class
This class allows use of the built-in SPI ports. Currently it is SPI master only.
Instances
Methods and Fields
- SPI.find(pin)
- function SPI.send(data, nss_pin)
- function SPI.send4bit(data, bit0, bit1, nss_pin)
- function SPI.send8bit(data, bit0, bit1, nss_pin)
- function SPI.setup(options)
- constructor SPI()
- function SPI.write(data, ...)
SPI.find ⇒
Call type:
SPI.find(pin)
Parameters
pin
- A pin to search with
Returns
An object of type SPI
, or undefined
if one couldn't be found.
Description
Try and find an SPI hardware device that will work on this pin (e.g. SPI1
)
May return undefined if no device can be found.
function SPI.send ⇒
Call type:
function SPI.send(data, nss_pin)
Parameters
data
- The data to send - either an Integer, Array, String, or Object of the form {data: ..., count:#}
nss_pin
- An nSS pin - this will be lowered before SPI output and raised afterwards (optional). There will be a small delay between when this is lowered and when sending starts, and also between sending finishing and it being raised.
Returns
The data that was returned
Description
Send data down SPI, and return the result. Sending an integer will return an integer, a String will return a String, and anything else will return a Uint8Array.
Sending multiple bytes in one call to send is preferable as they can then be transmitted end to end. Using multiple calls to send() will result in significantly slower transmission speeds.
For maximum speeds, please pass either Strings or Typed Arrays as arguments.
Note that you can even pass arrays of arrays, like [1,[2,3,4],5]
function SPI.send4bit ⇒
Call type:
function SPI.send4bit(data, bit0, bit1, nss_pin)
Parameters
data
- The data to send - either an integer, array, or string
bit0
- The 4 bits to send for a 0 (MSB first)
bit1
- The 4 bits to send for a 1 (MSB first)
nss_pin
- An nSS pin - this will be lowered before SPI output and raised afterwards (optional). There will be a small delay between when this is lowered and when sending starts, and also between sending finishing and it being raised.
Description
Send data down SPI, using 4 bits for each 'real' bit (MSB first). This can be useful for faking one-wire style protocols
Sending multiple bytes in one call to send is preferable as they can then be transmitted end to end. Using multiple calls to send() will result in significantly slower transmission speeds.
function SPI.send8bit ⇒
Call type:
function SPI.send8bit(data, bit0, bit1, nss_pin)
Parameters
data
- The data to send - either an integer, array, or string
bit0
- The 8 bits to send for a 0 (MSB first)
bit1
- The 8 bits to send for a 1 (MSB first)
nss_pin
- An nSS pin - this will be lowered before SPI output and raised afterwards (optional). There will be a small delay between when this is lowered and when sending starts, and also between sending finishing and it being raised
Description
Send data down SPI, using 8 bits for each 'real' bit (MSB first). This can be useful for faking one-wire style protocols
Sending multiple bytes in one call to send is preferable as they can then be transmitted end to end. Using multiple calls to send() will result in significantly slower transmission speeds.
Note: This is not available in devices with low flash memory
function SPI.setup ⇒
Call type:
function SPI.setup(options)
Parameters
options
- An Object containing extra information on initialising the SPI port
Description
Set up this SPI port as an SPI Master.
Options can contain the following (defaults are shown where relevant):
{
sck:pin,
miso:pin,
mosi:pin,
baud:integer=100000, // ignored on software SPI
mode:integer=0, // between 0 and 3
order:string='msb' // can be 'msb' or 'lsb'
bits:8 // only available for software SPI
}
If sck
,miso
and mosi
are left out, they will automatically be chosen.
However if one or more is specified then the unspecified pins will not be set
up.
You can find out which pins to use by looking at your board's reference
page and searching for pins with the SPI
marker. Some boards such as
those based on nRF52
chips can have SPI on any pins, so don't have specific
markings.
The SPI mode
is between 0 and 3 - see
http://en.wikipedia.org/wiki/SerialPeripheralInterfaceBus#Clockpolarityandphase
On STM32F1-based parts, you cannot mix AF and non-AF pins (SPI pins are usually grouped on the chip - and you can't mix pins from two groups). Espruino will not warn you about this.
constructor SPI ⇒
Call type:
new SPI()
Returns
A SPI object
Description
Create a software SPI port. This has limited functionality (no baud rate), but it can work on any pins.
Use SPI.setup
to configure this port.
function SPI.write ⇒
Call type:
function SPI.write(data, ...)
Parameters
data, ...
- One or more items to write. May be ints, strings, arrays, or special objects (see E.toUint8Array
for more info).
If the last argument is a pin, it is taken to be the NSS pin
Description
Write a character or array of characters to SPI - without reading the result back.
For maximum speeds, please pass either Strings or Typed Arrays as arguments.
Stepper Class
(2v21+ only) This class allows Espruino to control stepper motors.
On Espruino before 2v20 you can still use the Stepper Motor module at https://www.espruino.com/StepperMotor - it just isn't quite as fast.
Methods and Fields
- function Stepper.moveTo(direction, options)
- constructor Stepper(options)
- function Stepper.stop(options)
function Stepper.moveTo ⇒
Call type:
function Stepper.moveTo(direction, options)
Parameters
direction
- The amount of steps to move in either direction
options
- Optional options struct
Returns
A Promise that resolves when the stepper has finished moving
Description
Move a certain number of steps in either direction, options
can be:
{
freq : 100, // optional (frequency in Hz) step frequency
turnOff : true, // optional (default false) turn off stepper after this movement?
}
Note: This is only available in ESPRUSESTEPPER_TIMER
constructor Stepper ⇒
Call type:
new Stepper(options)
Parameters
options
- options struct {pins:[1,2,3,4]}
Returns
An Stepper object
Description
Create a Stepper
class. options
can contain:
{
pins : [...], // required - 4 element array of pins
pattern : [...], // optional - a 4/8 element array of step patterns
offpattern : 0, // optional (default 0) - the pattern to output to stop driving the stepper motor
freq : 500, // optional (default 500) steps per second
}
pins
must be supplied as a 4 element array of pins. When created,
if pin state has not been set manually on each pin, the pins will
be set to outputs.
If pattern
isn't specified, a default pattern of [0b0001,0b0010,0b0100,0b1000]
will be used. You
can specify different patterns, for example [0b1100,0b1000,0b1001,0b0001,0b0011,0b0010,0b0110,0b0100]
.
Note: This is only available in ESPRUSESTEPPER_TIMER
function Stepper.stop ⇒
Call type:
function Stepper.stop(options)
Parameters
options
- Optional options struct
Description
Stop a stepper motor that is currently running.
You can specify .stop({turnOff:true})
to force the stepper motor to turn off.
Note: This is only available in ESPRUSESTEPPER_TIMER
Storage Library
This module allows you to read and write part of the nonvolatile flash memory of your device using a filesystem-like API.
Also see the Flash
library, which provides a low level, more dangerous way to
access all parts of your flash memory.
The Storage
library provides two distinct types of file:
require("Storage").write(...)
/require("Storage").read(...)
/etc create simple contiguous files of fixed length. This is the recommended file type.require("Storage").open(...)
creates aStorageFile
, which stores the file in numbered chunks ("filename\1"
/"filename\2"
/etc). It allows data to be appended and for the file to be read line by line.
You must read a file using the same method you used to write it - e.g. you can't
create a file with require("Storage").open(...)
and then read it with
require("Storage").read(...)
.
Note: In firmware 2v05 and later, the maximum length for filenames is 28 characters. However in 2v04 and earlier the max length is 8.
Methods and Fields
- require("Storage").compact(showMessage)
- require("Storage").debug()
- require("Storage").erase(name)
- require("Storage").eraseAll()
- require("Storage").getFree(checkInternalFlash)
- require("Storage").getStats(checkInternalFlash)
- require("Storage").hash(regex)
- require("Storage").list(regex, filter)
- require("Storage").open(name, mode)
- require("Storage").optimise()
- require("Storage").read(name, offset, length)
- require("Storage").readArrayBuffer(name)
- require("Storage").readJSON(name, noExceptions)
- require("Storage").write(name, data, offset, size)
- require("Storage").writeJSON(name, data)
Storage.compact ⇒
Call type:
require("Storage").compact(showMessage)
Parameters
showMessage
- [optional] If true, an overlay message will be displayed on the screen while compaction is happening. Default is false.
Description
The Flash Storage system is journaling. To make the most of the limited write
cycles of Flash memory, Espruino marks deleted/replaced files as garbage/trash files and
moves on to a fresh part of flash memory. Espruino only fully erases those files
when it is running low on flash, or when compact
is called.
compact
may fail if there isn't enough RAM free on the stack to use as swap
space, however in this case it will not lose data.
Note: compact
rearranges the contents of memory. If code is referencing
that memory (e.g. functions that have their code stored in flash) then they may
become garbled when compaction happens. To avoid this, call eraseFiles
before
uploading data that you intend to reference to ensure that uploaded files are
right at the start of flash and cannot be compacted further.
Note: This is not available in devices with low flash memory
Storage.debug ⇒
Call type:
require("Storage").debug()
Description
This writes information about all blocks in flash memory to the console - and is only useful for debugging flash storage.
Note: This is only available in debug builds
Storage.erase ⇒
Call type:
require("Storage").erase(name)
Parameters
name
- The filename - max 28 characters (case sensitive)
Description
Erase a single file from the flash storage area.
Note: This function should be used with normal files, and not StorageFile
s
created with require("Storage").open(filename, ...)
. To erase those, use
require("Storage").open(..., "r").erase()
.
Storage.eraseAll ⇒
Call type:
require("Storage").eraseAll()
Description
Erase the flash storage area. This will remove all files created with
require("Storage").write(...)
as well as any code saved with save()
or
E.setBootCode()
.
Storage.getFree ⇒
Call type:
require("Storage").getFree(checkInternalFlash)
Parameters
checkInternalFlash
- Check the internal flash (rather than external SPI flash). Default false, so will check external storage
Returns
The amount of free bytes
Description
Return the amount of free bytes available in Storage. Due to fragmentation there may be more bytes available, but this represents the maximum size of file that can be written.
NOTE: checkInternalFlash
is only useful on DICKENS devices - other devices don't use two different flash banks
Note: This is not available in devices with low flash memory
Storage.getStats ⇒
Call type:
require("Storage").getStats(checkInternalFlash)
Parameters
checkInternalFlash
- Check the internal flash (rather than external SPI flash). Default false, so will check external storage
Returns
An object containing info about the current Storage system
Description
Returns:
{
totalBytes // Amount of bytes in filesystem
freeBytes // How many bytes are left at the end of storage?
fileBytes // How many bytes of allocated files do we have?
fileCount // How many allocated files do we have?
trashBytes // How many bytes of trash files do we have?
trashCount // How many trash files do we have? (can be cleared with .compact)
}
NOTE: checkInternalFlash
is only useful on DICKENS devices - other devices don't use two different flash banks
Note: This is not available in devices with low flash memory
Storage.hash ⇒
Call type:
require("Storage").hash(regex)
Parameters
regex
- [optional] If supplied, filenames are checked against this regular expression (with String.match(regexp)
) to see if they match before being hashed
Returns
A hash of the files matching
Description
List all files in the flash storage area matching the specified regex (ignores StorageFiles), and then hash their filenames and file locations.
Identical files may have different hashes (e.g. if Storage is compacted and the file moves) but the chances of different files having the same hash are extremely small.
// Hash files
require("Storage").hash()
// Files ending in '.boot.js'
require("Storage").hash(/\.boot\.js$/)
Note: This function is used by Bangle.js as a way to cache files. For
instance the bootloader will add all .boot.js
files together into a single
.boot0
file, but it needs to know quickly whether anything has changed.
Note: This is not available in devices with low flash memory
Storage.list ⇒
Call type:
require("Storage").list(regex, filter)
Parameters
regex
- [optional] If supplied, filenames are checked against this regular expression (with String.match(regexp)
) to see if they match before being returned
filter
- [optional] If supplied, File Types are filtered based on this: {sf:true}
or {sf:false}
for whether to show StorageFile
Returns
An array of filenames
Description
List all files in the flash storage area. An array of Strings is returned.
By default this lists files created by StorageFile
(require("Storage").open
)
which have a file number ("\1"
/"\2"
/etc) appended to them.
// All files
require("Storage").list()
// Files ending in '.js'
require("Storage").list(/\.js$/)
// All Storage Files
require("Storage").list(undefined, {sf:true})
// All normal files (e.g. created with Storage.write)
require("Storage").list(undefined, {sf:false})
Note: This will output system files (e.g. saved code) as well as files that you may have written.
Storage.open ⇒
Call type:
require("Storage").open(name, mode)
Parameters
name
- The filename - max 27 characters (case sensitive)
mode
- The open mode - must be either 'r'
for read,'w'
for write , or 'a'
for append
Returns
An object containing {read,write,erase}
Description
Open a file in the Storage area. This can be used for appending data (normal read/write operations only write the entire file).
Please see StorageFile
for more information (and examples).
Note: These files write through immediately - they do not need closing.
Note: This is not available in devices with low flash memory
Storage.optimise ⇒
Call type:
require("Storage").optimise()
Description
Writes a lookup table for files into Bangle.js's storage. This allows any file stored up to that point to be accessed quickly.
Note: This is not available in devices with low flash memory
Storage.read ⇒
Call type:
require("Storage").read(name, offset, length)
Parameters
name
- The filename - max 28 characters (case sensitive)
offset
- [optional] The offset in bytes to start from
length
- [optional] The length to read in bytes (if <=0, the entire file is read)
Returns
A string of data, or undefined
if the file is not found
Description
Read a file from the flash storage area that has been written with
require("Storage").write(...)
.
This function returns a memory-mapped String that points to the actual memory area in read-only memory, so it won't use up RAM.
As such you can check if a file exists efficiently using
require("Storage").read(filename)!==undefined
.
If you evaluate this string with eval
, any functions contained in the String
will keep their code stored in flash memory.
Note: This function should be used with normal files, and not StorageFile
s
created with require("Storage").open(filename, ...)
Storage.readArrayBuffer ⇒
Call type:
require("Storage").readArrayBuffer(name)
Parameters
name
- The filename - max 28 characters (case sensitive)
Returns
An ArrayBuffer containing data from the file, or undefined
Description
Read a file from the flash storage area that has been written with
require("Storage").write(...)
, and return the raw binary data as an
ArrayBuffer.
This can be used:
- In a
DataView
withnew DataView(require("Storage").readArrayBuffer("x"))
- In a
Uint8Array/Float32Array/etc
withnew Uint8Array(require("Storage").readArrayBuffer("x"))
Note: This function should be used with normal files, and not StorageFile
s
created with require("Storage").open(filename, ...)
Note: This is not available in devices with low flash memory
Storage.readJSON ⇒
Call type:
require("Storage").readJSON(name, noExceptions)
Parameters
name
- The filename - max 28 characters (case sensitive)
noExceptions
- If true and the JSON is not valid, just return undefined
- otherwise an Exception
is thrown
Returns
An object containing parsed JSON from the file, or undefined
Description
Read a file from the flash storage area that has been written with
require("Storage").write(...)
, and parse JSON in it into a JavaScript object.
This is identical to JSON.parse(require("Storage").read(...))
. It will throw
an exception if the data in the file is not valid JSON.
Note: This function should be used with normal files, and not StorageFile
s
created with require("Storage").open(filename, ...)
Note: This is not available in devices with low flash memory
Storage.write ⇒
Call type:
require("Storage").write(name, data, offset, size)
Parameters
name
- The filename - max 28 characters (case sensitive)
data
- The data to write
offset
- [optional] The offset within the file to write (if 0
/undefined
a new file is created, otherwise Espruino attempts to write within an existing file if one exists)
size
- [optional] The size of the file (if a file is to be created that is bigger than the data)
Returns
True on success, false on failure
Description
Write/create a file in the flash storage area. This is nonvolatile and will not disappear when the device resets or power is lost.
Simply write require("Storage").write("MyFile", "Some data")
to write a new
file, and require("Storage").read("MyFile")
to read it.
If you supply:
- A String, it will be written as-is
- An array, will be written as a byte array (but read back as a String)
- An object, it will automatically be converted to a JSON string before being written.
Note: If an array is supplied it will not be converted to JSON. To be
explicit about the conversion you can use Storage.writeJSON
You may also create a file and then populate data later as long as you don't try and overwrite data that already exists. For instance:
var f = require("Storage");
f.write("a","Hello",0,14); // Creates a new file, 14 chars long
print(JSON.stringify(f.read("a"))); // read the file
// any nonwritten chars will be char code 255:
"Hello\u00FF\u00FF\u00FF\u00FF\u00FF\u00FF\u00FF\u00FF\u00FF"
f.write("a"," ",5); // write within the file
f.write("a","World!!!",6); // write again within the file
print(f.read("a")); // "Hello World!!!"
f.write("a"," ",0); // Writing to location 0 again will cause the file to be re-written
print(f.read("a")); // " "
This can be useful if you've got more data to write than you have RAM available - for instance the Web IDE uses this method to write large files into onboard storage.
Note: This function should be used with normal files, and not StorageFile
s
created with require("Storage").open(filename, ...)
Storage.writeJSON ⇒
Call type:
require("Storage").writeJSON(name, data)
Parameters
name
- The filename - max 28 characters (case sensitive)
data
- The JSON data to write
Returns
True on success, false on failure
Description
Write/create a file in the flash storage area. This is nonvolatile and will not disappear when the device resets or power is lost.
Simply write require("Storage").writeJSON("MyFile", [1,2,3])
to write a new
file, and require("Storage").readJSON("MyFile")
to read it.
This is (almost) equivalent to require("Storage").write(name, JSON.stringify(data))
(see the notes below)
Note: This function should be used with normal files, and not StorageFile
s
created with require("Storage").open(filename, ...)
Note: Normally JSON.stringify
converts any non-standard character to an escape code with \uXXXX
, but
as of Espruino 2v20, when writing to a file we use the most compact form, like \xXX
or \X
, as well as
skipping quotes on fields. This saves space and is faster, but also means that if a String wasn't a UTF8
string but contained characters in the UTF8 codepoint range, when saved it won't end up getting reloaded as a UTF8 string.
It does mean that you cannot parse the file with just JSON.parse
as it's no longer standard JSON but is JS,
so you must use Storage.readJSON
Note: This is not available in devices with low flash memory
StorageFile Class
These objects are created from require("Storage").open
and allow Storage items
to be read/written.
The Storage
library writes into Flash memory (which can only be erased in
chunks), and unlike a normal filesystem it allocates files in one long
contiguous area to allow them to be accessed easily from Espruino.
This presents a challenge for StorageFile
which allows you to append to a
file, so instead StorageFile
stores files in chunks. It uses the last
character of the filename to denote the chunk number (e.g. "foobar\1"
,
"foobar\2"
, etc).
This means that while StorageFile
files exist in the same area as those from
Storage
, they should be read using Storage.open
(and not Storage.read
).
f = require("Storage").open("foobar","w");
f.write("Hell");
f.write("o World\n");
f.write("Hello\n");
f.write("World 2\n");
f.write("Hello World 3\n");
// there's no need to call 'close'
// then
f = require("Storage").open("foobar","r");
f.read(13) // "Hello World\nH"
f.read(13) // "ello\nWorld 2\n"
f.read(13) // "Hello World 3"
f.read(13) // "\n"
f.read(13) // undefined
// or
f = require("Storage").open("foobar","r");
f.readLine() // "Hello World\n"
f.readLine() // "Hello\n"
f.readLine() // "World 2\n"
f.readLine() // "Hello World 3\n"
f.readLine() // undefined
// now get rid of file
f.erase();
Note: StorageFile
uses the fact that all bits of erased flash memory are 1
to detect the end of a file. As such you should not write character code 255
("\xFF"
) to these files.
Methods and Fields
- function StorageFile.erase()
- function StorageFile.getLength()
- function StorageFile.pipe(destination, options)
- function StorageFile.read(len)
- function StorageFile.readLine()
- function StorageFile.write(data)
function StorageFile.erase ⇒
Call type:
function StorageFile.erase()
Description
Erase this StorageFile
- after being called this file can no longer be written to.
Note: You shouldn't call require("Storage").erase(...)
on a StorageFile
, but should
instead open the StorageFile and call .erase
on the returned file: require("Storage").open(..., "r").erase()
Note: This is not available in devices with low flash memory
function StorageFile.getLength ⇒
Call type:
function StorageFile.getLength()
Returns
The current length in bytes of the file
Description
Return the length of the current file.
This requires Espruino to read the file from scratch, which is not a fast operation.
Note: This is not available in devices with low flash memory
function StorageFile.pipe ⇒
Call type:
function StorageFile.pipe(destination, options)
Parameters
destination
- The destination file/stream that will receive content from the source.
options
- [optional] An object { chunkSize : int=32, end : bool=true, complete : function }
chunkSize : The amount of data to pipe from source to destination at a time
complete : a function to call when the pipe activity is complete
end : call the 'end' function on the destination when the source is finished
Description
Pipe this file to a stream (an object with a 'write' method)
Note: This is not available in devices with low flash memory
function StorageFile.read ⇒
Call type:
function StorageFile.read(len)
Parameters
len
- How many bytes to read
Returns
A String, or undefined
Description
Read 'len' bytes of data from the file, and return a String containing those bytes.
If the end of the file is reached, the String may be smaller than the amount of
bytes requested, or if the file is already at the end, undefined
is returned.
Note: This is not available in devices with low flash memory
function StorageFile.readLine ⇒
Call type:
function StorageFile.readLine()
Returns
A line of data
Description
Read a line of data from the file (up to and including "\n"
)
Note: This is not available in devices with low flash memory
function StorageFile.write ⇒
Call type:
function StorageFile.write(data)
Parameters
data
- The data to write. This should not include '\xFF'
(character code 255)
Description
Append the given data to a file. You should not attempt to append "\xFF"
(character code 255).
Note: This is not available in devices with low flash memory
String Class
This is the built-in class for Text Strings.
Text Strings in Espruino are not zero-terminated, so you can store zeros in them.
Methods and Fields
- function String.charAt(pos)
- function String.charCodeAt(pos)
- function String.concat(args, ...)
- function String.endsWith(searchString, length)
- String.fromCharCode(code, ...)
- function String.includes(substring, fromIndex)
- function String.indexOf(substring, fromIndex)
- function String.lastIndexOf(substring, fromIndex)
- property String.length
- function String.match(substr)
- function String.padEnd(targetLength, padString)
- function String.padStart(targetLength, padString)
- function String.removeAccents()
- function String.repeat(count)
- function String.replace(subStr, newSubStr)
- function String.slice(start, end)
- function String.split(separator)
- function String.startsWith(searchString, position)
- constructor String(str, ...)
- function String.substr(start, len)
- function String.substring(start, end)
- function String.toLowerCase()
- function String.toUpperCase()
- function String.trim()
function String.charAt ⇒
Call type:
function String.charAt(pos)
Parameters
pos
- The character number in the string. Negative values return characters from end of string (-1 = last char)
Returns
The character in the string
Description
Return a single character at the given position in the String.
function String.charCodeAt ⇒
Call type:
function String.charCodeAt(pos)
Parameters
pos
- The character number in the string. Negative values return characters from end of string (-1 = last char)
Returns
The integer value of a character in the string, or NaN
if out of bounds
Description
Return the integer value of a single character at the given position in the String.
function String.concat ⇒
Call type:
function String.concat(args, ...)
Parameters
args, ...
- Strings to append
Returns
The result of appending all arguments to this string
Description
Append all arguments to this String
and return the result. Does not modify the
original String
.
Note: This is not available in devices with low flash memory
function String.endsWith ⇒
Call type:
function String.endsWith(searchString, length)
Parameters
searchString
- The string to search for
length
- The 'end' of the string - if left off the actual length of the string is used
Returns
true
if the given characters are found at the end of the string, otherwise, false
.
String.fromCharCode ⇒
Call type:
String.fromCharCode(code, ...)
Parameters
code, ...
- One or more character codes to create a string from (range 0-255).
Returns
The character
Description
Return the character(s) represented by the given character code(s).
function String.includes ⇒
Call type:
function String.includes(substring, fromIndex)
Parameters
substring
- The string to search for
fromIndex
- The start character index (or 0 if not defined)
Returns
true
if the given characters are in the string, otherwise, false
.
function String.indexOf ⇒
Call type:
function String.indexOf(substring, fromIndex)
Parameters
substring
- The string to search for
fromIndex
- Index to search from
Returns
The index of the string, or -1 if not found
Description
Return the index of substring in this string, or -1 if not found
function String.lastIndexOf ⇒
Call type:
function String.lastIndexOf(substring, fromIndex)
Parameters
substring
- The string to search for
fromIndex
- Index to search from
Returns
The index of the string, or -1 if not found
Description
Return the last index of substring in this string, or -1 if not found
property String.length ⇒
Call type:
property String.length
Returns
The value of the string
Description
Find the length of the string
function String.match ⇒
Call type:
function String.match(substr)
Parameters
substr
- Substring or RegExp to match
Returns
A match array or null
(see below):
Description
Matches an occurrence subStr
in the string.
Returns null
if no match, or:
"abcdef".match("b") == [
"b", // array index 0 - the matched string
index: 1, // the start index of the match
input: "b" // the input string
]
"abcdefabcdef".match(/bcd/) == [
"bcd", index: 1,
input: "abcdefabcdef"
]
'Global' RegExp matches just return an array of matches (with no indices):
"abcdefabcdef".match(/bcd/g) = [
"bcd",
"bcd"
]
function String.padEnd ⇒
Call type:
function String.padEnd(targetLength, padString)
Parameters
targetLength
- The length to pad this string to
padString
- [optional] The string to pad with, default is ' '
Returns
A string containing this string padded to the correct length
Description
Pad this string at the end to the required number of characters
"Hello".padEnd(10) == "Hello "
"123".padEnd(10,".-") == "123.-.-.-."
Note: This is not available in devices with low flash memory
function String.padStart ⇒
Call type:
function String.padStart(targetLength, padString)
Parameters
targetLength
- The length to pad this string to
padString
- [optional] The string to pad with, default is ' '
Returns
A string containing this string padded to the correct length
Description
Pad this string at the beginning to the required number of characters
"Hello".padStart(10) == " Hello"
"123".padStart(10,".-") == ".-.-.-.123"
Note: This is not available in devices with low flash memory
function String.removeAccents ⇒
Call type:
function String.removeAccents()
Returns
This string with the accents/diacritics (such as é, ü) removed from characters in the ISO 8859-1 set
function String.repeat ⇒
Call type:
function String.repeat(count)
Parameters
count
- An integer with the amount of times to repeat this String
Returns
A string containing repetitions of this string
Description
Repeat this string the given number of times.
Note: This is not available in devices with low flash memory
function String.replace ⇒
Call type:
function String.replace(subStr, newSubStr)
Parameters
subStr
- The string to search for
newSubStr
- The string to replace it with
Returns
This string with subStr
replaced
Description
Search and replace ONE occurrence of subStr
with newSubStr
and return the
result. This doesn't alter the original string. Regular expressions not
supported.
function String.slice ⇒
Call type:
function String.slice(start, end)
Parameters
start
- The start character index, if negative it is from the end of the string
end
- [optional] The end character index, if negative it is from the end of the string, and if omitted it is the end of the string
Returns
Part of this string from start for len characters
function String.split ⇒
Call type:
function String.split(separator)
Parameters
Returns
Part of this string from start for len characters
Description
Return an array made by splitting this string up by the separator. e.g.
'1,2,3'.split(',')==['1', '2', '3']
Regular Expressions can also be used to split strings, e.g.
'1a2b3
4'.split(/[^0-9]/)==['1', '2', '3', '4']
.
function String.startsWith ⇒
Call type:
function String.startsWith(searchString, position)
Parameters
searchString
- The string to search for
position
- The start character index (or 0 if not defined)
Returns
true
if the given characters are found at the beginning of the string, otherwise, false
.
constructor String ⇒
Call type:
new String(str, ...)
Parameters
str, ...
- A value to turn into a string. If undefined or not supplied, an empty String is created.
Returns
A String
Description
Create a new String
function String.substr ⇒
Call type:
function String.substr(start, len)
Parameters
start
- The start character index
len
- The number of characters
Returns
Part of this string from start for len characters
function String.substring ⇒
Call type:
function String.substring(start, end)
Parameters
start
- The start character index (inclusive)
end
- The end character index (exclusive)
Returns
The part of this string between start and end
function String.toLowerCase ⇒
Call type:
function String.toLowerCase()
Parameters
Returns
The lowercase version of this string
function String.toUpperCase ⇒
Call type:
function String.toUpperCase()
Parameters
Returns
The uppercase version of this string
function String.trim ⇒
Call type:
function String.trim()
Returns
A String with Whitespace removed from the beginning and end
Description
Return a new string with any whitespace (tabs, space, form feed, newline, carriage return, etc) removed from the beginning and end.
SyntaxError Class
The base class for syntax errors
Methods and Fields
constructor SyntaxError ⇒
Call type:
new SyntaxError(message)
Parameters
message
- [optional] An message string
Returns
A SyntaxError object
Description
Creates a SyntaxError object
function SyntaxError.toString ⇒
Call type:
function SyntaxError.toString()
Returns
A String
TelnetServer Library
This library implements a telnet console for the Espruino interpreter. It requires a network connection, e.g. Wifi, and *currently only functions on the ESP8266 and on Linux *. It uses port 23 on the ESP8266 and port 2323 on Linux.
Note: To enable on Linux, run ./espruino --telnet
Methods and Fields
TelnetServer.setOptions ⇒
Call type:
require("TelnetServer").setOptions(options)
Parameters
options
- Options controlling the telnet console server { mode : 'on|off'}
tensorflow Library
Methods and Fields
tensorflow.create ⇒
Call type:
require("tensorflow").create(arenaSize, model)
Parameters
arenaSize
- The TensorFlow Arena size
model
- The model to use - this should be a flat array/string
Returns
A tensorflow instance
TFMicroInterpreter Class
Class containing an instance of TFMicroInterpreter
Methods and Fields
- function TFMicroInterpreter.getInput()
- function TFMicroInterpreter.getOutput()
- function TFMicroInterpreter.invoke()
function TFMicroInterpreter.getInput ⇒
Call type:
function TFMicroInterpreter.getInput()
Returns
An arraybuffer referencing the input data
function TFMicroInterpreter.getOutput ⇒
Call type:
function TFMicroInterpreter.getOutput()
Returns
An arraybuffer referencing the output data
function TFMicroInterpreter.invoke ⇒
Call type:
function TFMicroInterpreter.invoke()
tls Library
This library allows you to create TCPIP servers and clients using TLS encryption
In order to use this, you will need an extra module to get network connectivity.
This is designed to be a cut-down version of the node.js library. Please see the Internet page for more information on how to use it.
Methods and Fields
tls.connect ⇒
Call type:
require("tls").connect(options, callback)
Parameters
options
- An object containing host,port fields
callback
- A function(res) that will be called when a connection is made. You can then call res.on('data', function(data) { ... })
and res.on('close', function() { ... })
to deal with the response.
Returns
Returns a new net.Socket object
Description
Create a socket connection using TLS
Options can have ca
, key
and cert
fields, which should be the decoded
content of the certificate.
var options = url.parse("localhost:1234");
options.key = atob("MIIJKQ ... OZs08C");
options.cert = atob("MIIFi ... Uf93rN+");
options.ca = atob("MIIFgDCC ... GosQML4sc=");
require("tls").connect(options, ... );
If you have the certificates as .pem
files, you need to load these files, take
the information between the lines beginning with ----
, remove the newlines
from it so you have raw base64, and then feed it into atob
as above.
You can also:
* Just specify the filename (<=100 characters) and it will be loaded and parsed
if you have an SD card connected. For instance options.key = "key.pem";
* Specify a function, which will be called to retrieve the data. For instance
`options.key = function() { eeprom.loadmyinfo(); };
For more information about generating and using certificates, see:
https://engineering.circle.com/https-authorized-certs-with-node-js/
(You'll need to use 2048 bit certificates as opposed to 4096 bit shown above)
Note: This is only available in devices with TLS and SSL support (Espruino Pico and Espruino WiFi only)
tv Library
This library provides TV out capability on the Espruino and Espruino Pico.
See the Television page for more information.
Methods and Fields
tv.setup ⇒
Call type:
require("tv").setup(options, width)
Parameters
options
- Various options for the TV output
width
-
Returns
A graphics object
Description
This initialises the TV output. Options for PAL are as follows:
var g = require('tv').setup({ type : "pal",
video : A7, // Pin - SPI MOSI Pin for Video output (MUST BE SPI1)
sync : A6, // Pin - Timer pin to use for video sync
width : 384,
height : 270, // max 270
});
and for VGA:
var g = require('tv').setup({ type : "vga",
video : A7, // Pin - SPI MOSI Pin for Video output (MUST BE SPI1)
hsync : A6, // Pin - Timer pin to use for video sync
vsync : A5, // Pin - pin to use for video sync
width : 220,
height : 240,
repeat : 2, // amount of times to repeat each line
});
or
var g = require('tv').setup({ type : "vga",
video : A7, // Pin - SPI MOSI Pin for Video output (MUST BE SPI1)
hsync : A6, // Pin - Timer pin to use for video sync
vsync : A5, // Pin - pin to use for video sync
width : 220,
height : 480,
repeat : 1, // amount of times to repeat each line
});
See the Television page for more information.
TypeError Class
The base class for type errors
Methods and Fields
function TypeError.toString ⇒
Call type:
function TypeError.toString()
Returns
A String
constructor TypeError ⇒
Call type:
new TypeError(message)
Parameters
message
- [optional] An message string
Returns
A TypeError object
Description
Creates a TypeError object
Uint16Array Class
This is the built-in JavaScript class for a typed array of 16 bit unsigned integers.
Instantiate this in order to efficiently store arrays of data (Espruino's normal arrays store data in a map, which is inefficient for non-sparse arrays).
Arrays of this type include all the methods from ArrayBufferView
Methods and Fields
constructor Uint16Array ⇒
Call type:
new Uint16Array(arr, byteOffset, length)
Parameters
arr
- The array or typed array to base this off, or an integer which is the array length
byteOffset
- The byte offset in the ArrayBuffer (ONLY IF the first argument was an ArrayBuffer)
length
- The length (ONLY IF the first argument was an ArrayBuffer)
Returns
A typed array
Description
Create a typed array based on the given input. Either an existing Array Buffer,
an Integer as a Length, or a simple array. If an ArrayBufferView
(e.g.
Uint8Array
rather than ArrayBuffer
) is given, it will be completely copied
rather than referenced.
Uint24Array Class
This is the built-in JavaScript class for a typed array of 24 bit unsigned integers.
Instantiate this in order to efficiently store arrays of data (Espruino's normal arrays store data in a map, which is inefficient for non-sparse arrays).
Arrays of this type include all the methods from ArrayBufferView
Methods and Fields
constructor Uint24Array ⇒
Call type:
new Uint24Array(arr, byteOffset, length)
Parameters
arr
- The array or typed array to base this off, or an integer which is the array length
byteOffset
- The byte offset in the ArrayBuffer (ONLY IF the first argument was an ArrayBuffer)
length
- The length (ONLY IF the first argument was an ArrayBuffer)
Returns
A typed array
Description
Create a typed array based on the given input. Either an existing Array Buffer,
an Integer as a Length, or a simple array. If an ArrayBufferView
(e.g.
Uint8Array
rather than ArrayBuffer
) is given, it will be completely copied
rather than referenced.
Note: This is not available in devices with low flash memory
Uint32Array Class
This is the built-in JavaScript class for a typed array of 32 bit unsigned integers.
Instantiate this in order to efficiently store arrays of data (Espruino's normal arrays store data in a map, which is inefficient for non-sparse arrays).
Arrays of this type include all the methods from ArrayBufferView
Methods and Fields
constructor Uint32Array ⇒
Call type:
new Uint32Array(arr, byteOffset, length)
Parameters
arr
- The array or typed array to base this off, or an integer which is the array length
byteOffset
- The byte offset in the ArrayBuffer (ONLY IF the first argument was an ArrayBuffer)
length
- The length (ONLY IF the first argument was an ArrayBuffer)
Returns
A typed array
Description
Create a typed array based on the given input. Either an existing Array Buffer,
an Integer as a Length, or a simple array. If an ArrayBufferView
(e.g.
Uint8Array
rather than ArrayBuffer
) is given, it will be completely copied
rather than referenced.
Uint8Array Class
This is the built-in JavaScript class for a typed array of 8 bit unsigned integers.
Instantiate this in order to efficiently store arrays of data (Espruino's normal arrays store data in a map, which is inefficient for non-sparse arrays).
Arrays of this type include all the methods from ArrayBufferView
Methods and Fields
constructor Uint8Array ⇒
Call type:
new Uint8Array(arr, byteOffset, length)
Parameters
arr
- The array or typed array to base this off, or an integer which is the array length
byteOffset
- The byte offset in the ArrayBuffer (ONLY IF the first argument was an ArrayBuffer)
length
- The length (ONLY IF the first argument was an ArrayBuffer)
Returns
A typed array
Description
Create a typed array based on the given input. Either an existing Array Buffer,
an Integer as a Length, or a simple array. If an ArrayBufferView
(e.g.
Uint8Array
rather than ArrayBuffer
) is given, it will be completely copied
rather than referenced.
Uint8ClampedArray Class
This is the built-in JavaScript class for a typed array of 8 bit unsigned integers that are automatically clamped to the range 0 to 255.
Instantiate this in order to efficiently store arrays of data (Espruino's normal arrays store data in a map, which is inefficient for non-sparse arrays).
Arrays of this type include all the methods from ArrayBufferView
Methods and Fields
constructor Uint8ClampedArray ⇒
Call type:
new Uint8ClampedArray(arr, byteOffset, length)
Parameters
arr
- The array or typed array to base this off, or an integer which is the array length
byteOffset
- The byte offset in the ArrayBuffer (ONLY IF the first argument was an ArrayBuffer)
length
- The length (ONLY IF the first argument was an ArrayBuffer)
Returns
A typed array
Description
Create a typed array based on the given input. Either an existing Array Buffer,
an Integer as a Length, or a simple array. If an ArrayBufferView
(e.g.
Uint8Array
rather than ArrayBuffer
) is given, it will be completely copied
rather than referenced.
Clamped arrays clamp their values to the allowed range, rather than 'wrapping'.
e.g. after a[0]=12345;
, a[0]==255
.
Unistroke Class
This class provides functionality to recognise gestures drawn on a touchscreen. It is only built into Bangle.js 2.
Usage:
var strokes = {
stroke1 : Unistroke.new(new Uint8Array([x1, y1, x2, y2, x3, y3, ...])),
stroke2 : Unistroke.new(new Uint8Array([x1, y1, x2, y2, x3, y3, ...])),
stroke3 : Unistroke.new(new Uint8Array([x1, y1, x2, y2, x3, y3, ...]))
};
var r = Unistroke.recognise(strokes,new Uint8Array([x1, y1, x2, y2, x3, y3, ...]))
print(r); // stroke1/stroke2/stroke3
Methods and Fields
Unistroke.new ⇒
Call type:
Unistroke.new(xy)
Parameters
xy
- An array of interleaved XY coordinates
Returns
A string of data representing this unistroke
Description
Create a new Unistroke based on XY coordinates
Note: This is only available in Bangle.js 2 smartwatches
Unistroke.recognise ⇒
Call type:
Unistroke.recognise(strokes, xy)
Parameters
strokes
- An object of named strokes : {arrow:..., circle:...}
xy
- An array of interleaved XY coordinates
Returns
The key name of the matched stroke
Description
Recognise based on an object of named strokes, and a list of XY coordinates
Note: This is only available in Bangle.js 2 smartwatches
url Class
This class helps to convert URLs into Objects of information ready for http.request/get
Methods and Fields
url.parse ⇒
Call type:
url.parse(urlStr, parseQuery)
Parameters
urlStr
- A URL to be parsed
parseQuery
- Whether to parse the query string into an object not (default = false)
Returns
An object containing options for http.request
or http.get
. Contains method
, host
, path
, pathname
, search
, port
and query
Description
A utility function to split a URL into parts
This is useful in web servers for instance when handling a request.
For instance url.parse("/a?b=c&d=e",true)
returns
{"method":"GET","host":"","path":"/a?b=c&d=e","pathname":"/a","search":"?b=c&d=e","port":80,"query":{"b":"c","d":"e"}}
Waveform Class
This class handles waveforms. In Espruino, a Waveform is a set of data that you want to input or output.
Methods and Fields
- function Waveform.startInput(output, freq, options)
- function Waveform.startOutput(output, freq, options)
- function Waveform.stop()
- constructor Waveform(samples, options)
function Waveform.startInput ⇒
Call type:
function Waveform.startInput(output, freq, options)
Parameters
output
- The pin to output on
freq
- The frequency to output each sample at
options
- Optional options struct {time:float,repeat:bool}
where: time
is the that the waveform with start output at, e.g. getTime()+1
(otherwise it is immediate), repeat
is a boolean specifying whether to repeat the give sample
Description
Will start inputting the waveform on the given pin that supports analog. If not
repeating, it'll emit a finish
event when it is done.
Note: This is not available in devices with low flash memory
function Waveform.startOutput ⇒
Call type:
function Waveform.startOutput(output, freq, options)
Parameters
output
- The pin to output on
freq
- The frequency to output each sample at
options
- Optional options struct {time:float,repeat:bool}
where: time
is the that the waveform with start output at, e.g. getTime()+1
(otherwise it is immediate), repeat
is a boolean specifying whether to repeat the give sample
Description
Will start outputting the waveform on the given pin - the pin must have
previously been initialised with analogWrite. If not repeating, it'll emit a
finish
event when it is done.
Note: This is not available in devices with low flash memory
function Waveform.stop ⇒
Call type:
function Waveform.stop()
Description
Stop a waveform that is currently outputting
Note: This is not available in devices with low flash memory
constructor Waveform ⇒
Call type:
new Waveform(samples, options)
Parameters
samples
- The number of samples
options
- Optional options struct {doubleBuffer:bool, bits : 8/16}
where: doubleBuffer
is whether to allocate two buffers or not (default false), and bits is the amount of bits to use (default 8).
Returns
An Waveform object
Description
Create a waveform class. This allows high speed input and output of waveforms.
It has an internal variable called buffer
(as well as buffer2
when
double-buffered - see options
below) which contains the data to input/output.
When double-buffered, a 'buffer' event will be emitted each time a buffer is finished with (the argument is that buffer). When the recording stops, a 'finish' event will be emitted (with the first argument as the buffer).
Note: This is not available in devices with low flash memory
Wifi Library
The Wifi library is designed to control the Wifi interface. It supports functionality such as connecting to wifi networks, getting network information, starting an access point, etc.
It is available on these devices:
Certain features may or may not be implemented on your device however we have documented what is available and what isn't.
If you're not using one of the devices above, a separate WiFi library is provided. For instance:
Other ways of connecting to the net such as GSM, Ethernet and LTE have their own libraries.
You can use the WiFi library as follows:
var wifi = require("Wifi");
wifi.connect("my-ssid", {password:"my-pwd"}, function(ap){ console.log("connected:", ap); });
On ESP32/ESP8266 if you want the connection to happen automatically at boot, add
wifi.save();
. On other platforms, place wifi.connect
in a function called
onInit
.
Methods and Fields
- event require("Wifi").associated(details)
- event require("Wifi").auth_change(details)
- require("Wifi").connect(ssid, options, callback)
- event require("Wifi").connected(details)
- event require("Wifi").dhcp_timeout()
- require("Wifi").disconnect(callback)
- event require("Wifi").disconnected(details)
- require("Wifi").getAPDetails(callback)
- require("Wifi").getAPIP(callback)
- require("Wifi").getDetails(callback)
- require("Wifi").getHostByName(hostname, callback)
- require("Wifi").getHostname(callback)
- require("Wifi").getIP(callback)
- require("Wifi").getStatus(callback)
- require("Wifi").ping(hostname, callback)
- event require("Wifi").probe_recv(details)
- require("Wifi").restore()
- require("Wifi").save(what)
- require("Wifi").scan(callback)
- require("Wifi").setAPIP(settings, callback)
- require("Wifi").setConfig(settings)
- require("Wifi").setHostname(hostname, callback)
- require("Wifi").setIP(settings, callback)
- require("Wifi").setSNTP(server, tz_offset)
- event require("Wifi").sta_joined(details)
- event require("Wifi").sta_left(details)
- require("Wifi").startAP(ssid, options, callback)
- require("Wifi").stopAP(callback)
- require("Wifi").turbo(enable, callback)
event Wifi.associated ⇒
Call type:
Wifi.on('associated', function(details) { ... });
Parameters
details
- An object with event details
Description
The 'associated' event is called when an association with an access point has succeeded, i.e., a connection to the AP's network has been established.
On ESP32/ESP8266 there is a details
parameter which includes:
- ssid - The SSID of the access point to which the association was established
- mac - The BSSID/mac address of the access point
- channel - The wifi channel used (an integer, typ 1..14)
event Wifi.auth_change ⇒
Call type:
Wifi.on('auth_change', function(details) { ... });
Parameters
details
- An object with event details
Description
The 'auth_change' event is called when the authentication mode with the associated access point changes. The details include:
- oldMode - The old auth mode (string: open, wep, wpa, wpa2, wpa_wpa2)
- newMode - The new auth mode (string: open, wep, wpa, wpa2, wpa_wpa2)
Note: This is only available in ESP32 boards and ESP8266 boards running Espruino
Wifi.connect ⇒
Call type:
require("Wifi").connect(ssid, options, callback)
Parameters
ssid
- The access point network id.
options
- [optional] Connection options.
callback
- A callback(err)
function to be called back on completion. err
is null on success, or contains an error string on failure.
Description
Connect to an access point as a station. If there is an existing connection to
an AP it is first disconnected if the SSID or password are different from those
passed as parameters. Put differently, if the passed SSID and password are
identical to the currently connected AP then nothing is changed. When the
connection attempt completes the callback function is invoked with one err
parameter, which is NULL if there is no error and a string message if there is
an error. If DHCP is enabled the callback occurs once an IP address has been
obtained, if a static IP is set the callback occurs once the AP's network has
been joined. The callback is also invoked if a connection already exists and
does not need to be changed.
The options properties may contain:
password
- Password string to be used to access the network.dnsServers
(array of String) - An array of up to two DNS servers in dotted decimal format string.channel
- Wifi channel of the access point (integer, typ 0..14, 0 means any channel), only on ESP8266.bssid
- Mac address of the access point (string, type "00:00:00:00:00:00"), only on ESP8266.
Notes:
- the options should include the ability to set a static IP and associated netmask and gateway, this is a future enhancement.
- the only error reported in the callback is "Bad password", all other errors
(such as access point not found or DHCP timeout) just cause connection
retries. If the reporting of such temporary errors is desired, the caller must
use its own timeout and the
getDetails().status
field. - the
connect
call automatically enabled station mode, it can be disabled again by callingdisconnect
.
event Wifi.connected ⇒
Call type:
Wifi.on('connected', function(details) { ... });
Parameters
details
- An object with event details
Description
The 'connected' event is called when the connection with an access point is ready for traffic. In the case of a dynamic IP address configuration this is when an IP address is obtained, in the case of static IP address allocation this happens when an association is formed (in that case the 'associated' and 'connected' events are fired in rapid succession).
On ESP32/ESP8266 there is a details
parameter which includes:
- ip - The IP address obtained as string
- netmask - The network's IP range mask as string
- gw - The network's default gateway as string
event Wifi.dhcp_timeout ⇒
Call type:
Wifi.on('dhcp_timeout', function() { ... });
Description
The 'dhcp_timeout' event is called when a DHCP request to the connected access point fails and thus no IP address could be acquired (or renewed).
Note: This is only available in ESP32 boards and ESP8266 boards running Espruino
Wifi.disconnect ⇒
Call type:
require("Wifi").disconnect(callback)
Parameters
callback
- [optional] An callback()
function to be called back on disconnection. The callback function receives no argument.
Description
Disconnect the wifi station from an access point and disable the station mode.
It is OK to call disconnect
to turn off station mode even if no connection
exists (for example, connection attempts may be failing). Station mode can be
re-enabled by calling connect
or scan
.
event Wifi.disconnected ⇒
Call type:
Wifi.on('disconnected', function(details) { ... });
Parameters
details
- An object with event details
Description
The 'disconnected' event is called when an association with an access point has been lost.
On ESP32/ESP8266 there is a details
parameter which includes:
- ssid - The SSID of the access point from which the association was lost
- mac - The BSSID/mac address of the access point
- reason - The reason for the disconnection (string)
Wifi.getAPDetails ⇒
Call type:
require("Wifi").getAPDetails(callback)
Parameters
callback
- [optional] A callback(details)
function to be called back with the current access point details, i.e. the same object as returned directly.
Returns
An object representing the current access point details, if available immediately.
Description
Retrieve the current access point configuration and status. The details object has the following properties:
status
- Current access point status:enabled
ordisabled
stations
- an array of the stations connected to the access point. This array may be empty. Each entry in the array is an object describing the station which, at a minimum containsip
being the IP address of the station.ssid
- SSID to broadcast.password
- Password for authentication.authMode
- the authentication required of stations:open
,wpa
,wpa2
,wpa_wpa2
.hidden
- True if the SSID is hidden, false otherwise.maxConn
- Max number of station connections supported.savedSsid
- the SSID to broadcast automatically at boot time, null if the access point is to be disabled at boot.
Note: This is only available in ESP32 boards and ESP8266 boards running Espruino
Wifi.getAPIP ⇒
Call type:
require("Wifi").getAPIP(callback)
Parameters
callback
- [optional] A callback(err, ipinfo)
function to be called back with the the IP information.
Returns
An object representing the esp8266's Access Point IP information, if available immediately (ONLY on ESP8266/ESP32).
Description
Return the access point IP information in an object which contains:
- ip - IP address as string (typ "192.168.4.1")
- netmask - The interface netmask as string
- gw - The network gateway as string
- mac - The MAC address as string of the form 00:00:00:00:00:00
Wifi.getDetails ⇒
Call type:
require("Wifi").getDetails(callback)
Parameters
callback
- [optional] An callback(details)
function to be called back with the wifi details, i.e. the same object as returned directly.
Returns
An object representing the wifi station details, if available immediately.
Description
Retrieve the wifi station configuration and status details. The details object has the following properties:
status
- Details about the wifi station connection, one ofoff
,connecting
,wrong_password
,no_ap_found
,connect_fail
, orconnected
. The off, badpassword and connected states are stable, the other states are transient. The connecting state will either result in connected or one of the error states (badpassword, noapfound, connectfail) and the noapfound and connectfail states will result in a reconnection attempt after some interval.rssi
- signal strength of the connected access point in dB, typically in the range -110 to 0, with anything greater than -30 being an excessively strong signal.ssid
- SSID of the access point.password
- the password used to connect to the access point.authMode
- the authentication used:open
,wpa
,wpa2
,wpa_wpa2
(not currently supported).savedSsid
- the SSID to connect to automatically at boot time, null if none.
Note: This is only available in ESP32 boards and ESP8266 boards running Espruino
Wifi.getHostByName ⇒
Call type:
require("Wifi").getHostByName(hostname, callback)
Parameters
hostname
- The hostname to lookup.
callback
- The callback(ip)
to invoke when the IP is returned. ip==null
on failure.
Description
Lookup the hostname and invoke a callback with the IP address as integer argument. If the lookup fails, the callback is invoked with a null argument. Note: only a single hostname lookup can be made at a time, concurrent lookups are not supported.
Note: This is only available in ESP8266 boards running Espruino and ESP32 boards
Wifi.getHostname ⇒
Call type:
require("Wifi").getHostname(callback)
Parameters
callback
- [optional] A callback(hostname)
function to be called back with the hostname.
Returns
The currently configured hostname, if available immediately.
Description
Returns the hostname announced to the DHCP server and broadcast via mDNS when connecting to an access point.
Note: This is only available in ESP8266 boards running Espruino and ESP32 boards
Wifi.getIP ⇒
Call type:
require("Wifi").getIP(callback)
Parameters
callback
- [optional] A callback(err, ipinfo)
function to be called back with the IP information.
Returns
An object representing the station IP information, if available immediately (ONLY on ESP8266/ESP32).
Description
Return the station IP information in an object as follows:
- ip - IP address as string (e.g. "192.168.1.5")
- netmask - The interface netmask as string (ESP8266/ESP32 only)
- gw - The network gateway as string (ESP8266/ESP32 only)
- mac - The MAC address as string of the form 00:00:00:00:00:00
Note that the ip
, netmask
, and gw
fields are omitted if no connection is established:
Wifi.getStatus ⇒
Call type:
require("Wifi").getStatus(callback)
Parameters
callback
- Optional callback(status)
function to be called back with the current Wifi status, i.e. the same object as returned directly.
Returns
An object representing the current WiFi status, if available immediately.
Description
Retrieve the current overall WiFi configuration. This call provides general information that pertains to both station and access point modes. The getDetails and getAPDetails calls provide more in-depth information about the station and access point configurations, respectively. The status object has the following properties:
station
- Status of the wifi station:off
,connecting
, ...ap
- Status of the wifi access point:disabled
,enabled
.mode
- The current operation mode:off
,sta
,ap
,sta+ap
.phy
- Modulation standard configured:11b
,11g
,11n
(the esp8266 docs are not very clear, but it is assumed that 11n means b/g/n). This setting limits the modulations that the radio will use, it does not indicate the current modulation used with a specific access point.powersave
- Power saving mode:none
(radio is on all the time),ps-poll
(radio is off between beacons as determined by the access point's DTIM setting). Note that in 'ap' and 'sta+ap' modes the radio is always on, i.e., no power saving is possible.savedMode
- The saved operation mode which will be applied at boot time:off
,sta
,ap
,sta+ap
.
Note: This is only available in ESP32 boards and ESP8266 boards running Espruino
Wifi.ping ⇒
Call type:
require("Wifi").ping(hostname, callback)
Parameters
hostname
- The host to ping
callback
- A callback(time)
function to invoke when a ping is received
Description
Issues a ping to the given host, and calls a callback with the time when the ping is received.
Note: This is only available in Espruino WiFi boards and ESP8266 boards running Espruino and ESP32 boards
event Wifi.probe_recv ⇒
Call type:
Wifi.on('probe_recv', function(details) { ... });
Parameters
details
- An object with event details
Description
The 'probe_recv' event is called when a probe request is received from some station by the esp8266's access point. The details include:
- mac - The MAC address of the station in string format (00:00:00:00:00:00)
- rssi - The signal strength in dB of the probe request
Note: This is only available in ESP32 boards and ESP8266 boards running Espruino
Wifi.restore ⇒
Call type:
require("Wifi").restore()
Description
Restores the saved Wifi configuration from flash. See Wifi.save()
.
Note: This is only available in ESP32 boards and ESP8266 boards running Espruino
Wifi.save ⇒
Call type:
require("Wifi").save(what)
Parameters
what
- An optional parameter to specify what to save, on the esp8266 the two supported values are clear
and sta+ap
. The default is sta+ap
Description
On boards where this is not available, just issue the connect
commands you
need to run at startup from an onInit
function.
Save the current wifi configuration (station and access point) to flash and
automatically apply this configuration at boot time, unless what=="clear"
, in
which case the saved configuration is cleared such that wifi remains disabled at
boot. The saved configuration includes:
- mode (off/sta/ap/sta+ap)
- SSIDs & passwords
- phy (11b/g/n)
- powersave setting
- DHCP hostname
Note: This is only available in ESP32 boards and ESP8266 boards running Espruino
Wifi.scan ⇒
Call type:
require("Wifi").scan(callback)
Parameters
callback
- A callback(err, ap_list)
function to be called back on completion. err==null
and ap_list
is an array on success, or err
is an error string and ap_list
is undefined on failure.
Description
Perform a scan for access points. This will enable the station mode if it is not currently enabled. Once the scan is complete the callback function is called with an array of APs found, each AP is an object with:
ssid
: SSID string.mac
: access point MAC address in 00:00:00:00:00:00 format.authMode
:open
,wep
,wpa
,wpa2
, orwpa_wpa2
.channel
: wifi channel 1..13.hidden
: true if the SSID is hidden (ESP32/ESP8266 only)rssi
: signal strength in dB in the range -110..0.
Notes: * in order to perform the scan the station mode is turned on and remains on, use Wifi.disconnect() to turn it off again, if desired. * only one scan can be in progress at a time.
Wifi.setAPIP ⇒
Call type:
require("Wifi").setAPIP(settings, callback)
Parameters
settings
- Configuration settings
callback
- A callback(err)
function to invoke when ip is set. err==null
on success, or a string on failure.
Description
The settings
object must contain the following properties.
ip
IP address as string (e.g. "192.168.5.100")gw
The network gateway as string (e.g. "192.168.5.1")netmask
The interface netmask as string (e.g. "255.255.255.0")
Note: This is only available in Espruino WiFi boards and ESP8266 boards running Espruino
Wifi.setConfig ⇒
Call type:
require("Wifi").setConfig(settings)
Parameters
settings
- An object with the configuration settings to change.
Description
Sets a number of global wifi configuration settings. All parameters are optional and which are passed determines which settings are updated. The settings available are:
phy
- Modulation standard to allow:11b
,11g
,11n
(the esp8266 docs are not very clear, but it is assumed that 11n means b/g/n).powersave
- Power saving mode:none
(radio is on all the time),ps-poll
(radio is off between beacons as determined by the access point's DTIM setting). Note that in 'ap' and 'sta+ap' modes the radio is always on, i.e., no power saving is possible.
Note: esp8266 SDK programmers may be missing an "opmode" option to set the sta/ap/sta+ap operation mode. Please use connect/scan/disconnect/startAP/stopAP, which all set the esp8266 opmode indirectly.
Note: This is only available in ESP32 boards and ESP8266 boards running Espruino
Wifi.setHostname ⇒
Call type:
require("Wifi").setHostname(hostname, callback)
Parameters
hostname
- The new hostname.
callback
- [optional] A callback()
function to be called back when the hostname is set
Description
Set the hostname. Depending on implementation, the hostname is sent with every DHCP request and is broadcast via mDNS. The DHCP hostname may be visible in the access point and may be forwarded into DNS as hostname.local. If a DHCP lease currently exists changing the hostname will cause a disconnect and reconnect in order to transmit the change to the DHCP server. The mDNS announcement also includes an announcement for the "espruino" service.
Note: This is only available in ESP8266 boards running Espruino and Espruino WiFi boards and ESP32 boards
Wifi.setIP ⇒
Call type:
require("Wifi").setIP(settings, callback)
Parameters
settings
- Configuration settings
callback
- A callback(err)
function to invoke when ip is set. err==null
on success, or a string on failure.
Description
The settings
object must contain the following properties.
ip
IP address as string (e.g. "192.168.5.100")gw
The network gateway as string (e.g. "192.168.5.1")netmask
The interface netmask as string (e.g. "255.255.255.0")
Note: This is only available in ESP8266 boards running Espruino and Espruino WiFi boards
Wifi.setSNTP ⇒
Call type:
require("Wifi").setSNTP(server, tz_offset)
Parameters
server
- The NTP server to query, for example, us.pool.ntp.org
tz_offset
- Local time zone offset in the range -11..13.
Description
Starts the SNTP (Simple Network Time Protocol) service to keep the clock synchronized with the specified server. Note that the time zone is really just an offset to UTC and doesn't handle daylight savings time. The interval determines how often the time server is queried and Espruino's time is synchronized. The initial synchronization occurs asynchronously after setSNTP returns.
Note: This is only available in ESP8266 boards running Espruino and ESP32 boards
event Wifi.sta_joined ⇒
Call type:
Wifi.on('sta_joined', function(details) { ... });
Parameters
details
- An object with event details
Description
The 'sta_joined' event is called when a station establishes an association (i.e. connects) with the esp8266's access point. The details include:
- mac - The MAC address of the station in string format (00:00:00:00:00:00)
Note: This is only available in ESP32 boards and ESP8266 boards running Espruino
event Wifi.sta_left ⇒
Call type:
Wifi.on('sta_left', function(details) { ... });
Parameters
details
- An object with event details
Description
The 'sta_left' event is called when a station disconnects from the esp8266's access point (or its association times out?). The details include:
- mac - The MAC address of the station in string format (00:00:00:00:00:00)
Note: This is only available in ESP32 boards and ESP8266 boards running Espruino
Wifi.startAP ⇒
Call type:
require("Wifi").startAP(ssid, options, callback)
Parameters
ssid
- The network id.
options
- [optional] Configuration options.
callback
- Optional callback(err)
function to be called when the AP is successfully started. err==null
on success, or an error string on failure.
Description
Create a WiFi access point allowing stations to connect. If the password is NULL
or an empty string the access point is open, otherwise it is encrypted. The
callback function is invoked once the access point is set-up and receives one
err
argument, which is NULL on success and contains an error message string
otherwise.
The options
object can contain the following properties.
authMode
- The authentication mode to use. Can be one of "open", "wpa2", "wpa", "wpa_wpa2". The default is open (but open access points are not recommended).password
- The password for connecting stations if authMode is not open.channel
- The channel to be used for the access point in the range 1..13. If the device is also connected to an access point as a station then that access point determines the channel.hidden
- The flag if visible or not (0:visible, 1:hidden), default is visible.
Notes:
- the options should include the ability to set the AP IP and associated netmask, this is a future enhancement.
- the
startAP
call automatically enables AP mode. It can be disabled again by callingstopAP
.
Wifi.stopAP ⇒
Call type:
require("Wifi").stopAP(callback)
Parameters
callback
- [optional] An callback()
function to be called back on successful stop. The callback function receives no argument.
Description
Stop being an access point and disable the AP operation mode. AP mode can be
re-enabled by calling startAP
.
Wifi.turbo ⇒
Call type:
require("Wifi").turbo(enable, callback)
Parameters
enable
- true (or a baud rate as a number) to enable, false to disable
callback
- A callback()
function to invoke when turbo mode has been set
Description
Switch to using a higher communication speed with the WiFi module.
true
= 921600 baudfalse
= 1152001843200
(or any number) = use a specific baud rate. * e.g.wifi.turbo(true,callback)
orwifi.turbo(1843200,callback)
Note: This is only available in Espruino WiFi boards
WioLTE Class
Class containing utility functions for the Seeed WIO LTE board
Methods and Fields
- WioLTE.A4
- WioLTE.A6
- WioLTE.D20
- WioLTE.D38
- WioLTE.I2C
- WioLTE.LED(red, green, blue)
- WioLTE.setGrovePower(onoff)
- WioLTE.setLEDPower(onoff)
- WioLTE.UART
WioLTE.A4 ⇒
Call type:
WioLTE.A4
Returns
See description above
WioLTE.A6 ⇒
Call type:
WioLTE.A6
Returns
See description above
WioLTE.D20 ⇒
Call type:
WioLTE.D20
Returns
See description above
WioLTE.D38 ⇒
Call type:
WioLTE.D38
Returns
See description above
WioLTE.I2C ⇒
Call type:
WioLTE.I2C
Returns
See description above
WioLTE.LED ⇒
Call type:
WioLTE.LED(red, green, blue)
Parameters
red
- 0-255, red LED intensity
green
- 0-255, green LED intensity
blue
- 0-255, blue LED intensity
Description
Set the WIO's LED
WioLTE.setGrovePower ⇒
Call type:
WioLTE.setGrovePower(onoff)
Parameters
onoff
- Whether to turn the Grove connectors power on or off (D38/D39 are always powered)
Description
Set the power of Grove connectors, except for D38
and D39
which are always
on.
WioLTE.setLEDPower ⇒
Call type:
WioLTE.setLEDPower(onoff)
Parameters
onoff
- true = on, false = off
Description
Turn power to the WIO's LED on or off.
Turning the LED on won't immediately display a color - that must be done with
WioLTE.LED(r,g,b)
WioLTE.UART ⇒
Call type:
WioLTE.UART
Returns
See description above
WIZnet Library
Library for communication with the WIZnet Ethernet module
Methods and Fields
WIZnet.connect ⇒
Call type:
require("WIZnet").connect(spi, cs)
Parameters
spi
- Device to use for SPI (or undefined to use the default)
cs
- The pin to use for Chip Select
Returns
An Ethernet Object
Description
Initialise the WIZnet module and return an Ethernet object
Note: This is only available in builds with support for WIZnet Ethernet modules built in
WLAN Class
An instantiation of a WiFi network adaptor
Methods and Fields
- function WLAN.connect(ap, key, callback)
- function WLAN.disconnect()
- function WLAN.getIP()
- function WLAN.reconnect()
- function WLAN.setIP(options)
function WLAN.connect ⇒
Call type:
function WLAN.connect(ap, key, callback)
Parameters
ap
- Access point name
key
- WPA2 key (or undefined for unsecured connection)
callback
- Function to call back with connection status. It has one argument which is one of 'connect'/'disconnect'/'dhcp'
Returns
True if connection succeeded, false if it didn't.
Description
Connect to a wireless network
function WLAN.disconnect ⇒
Call type:
function WLAN.disconnect()
Description
Completely uninitialise and power down the CC3000. After this you'll have to use
require("CC3000").connect()
again.
function WLAN.getIP ⇒
Call type:
function WLAN.getIP()
Returns
See description above
Description
Get the current IP address
function WLAN.reconnect ⇒
Call type:
function WLAN.reconnect()
Description
Completely uninitialise and power down the CC3000, then reconnect to the old access point.
function WLAN.setIP ⇒
Call type:
function WLAN.setIP(options)
Parameters
options
- Object containing IP address options { ip : '1,2,3,4', subnet, gateway, dns }
, or do not supply an object in otder to force DHCP.
Returns
True on success
Description
Set the current IP address for get an IP from DHCP (if no options object is specified).
Note: Changes are written to non-volatile memory, but will only take effect
after calling wlan.reconnect()