/
ssd1306.js
165 lines (144 loc) · 4.81 KB
/
ssd1306.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
/* Copyright (c) 2014 Sam Sykes, Gordon Williams. See the file LICENSE for copying permission. */
/*
Module for the SSD1306 OLED controller in displays like the Crius CO-16
```
function go(){
// write some text
g.drawString("Hello World!",2,2);
// write to the screen
g.flip();
}
// I2C
I2C1.setup({scl:B6,sda:B7});
var g = require("SSD1306").connect(I2C1, go);
// or
var g = require("SSD1306").connect(I2C1, go, { address: 0x3C });
// SPI
var s = new SPI();
s.setup({mosi: B6, sck:B5});
var g = require("SSD1306").connectSPI(s, A8, B7, go);
```
*/
var C = {
OLED_WIDTH : 128,
OLED_CHAR : 0x40,
OLED_CHUNK : 128
};
// commands sent when initialising the display
var extVcc=false; // if true, don't start charge pump
var initCmds = new Uint8Array([
0xAE, // 0 disp off
0xD5, // 1 clk div
0x80, // 2 suggested ratio
0xA8, 63, // 3 set multiplex, height-1
0xD3,0x0, // 5 display offset
0x40, // 7 start line
0x8D, extVcc?0x10:0x14, // 8 charge pump (need 0x14)
0x20, 0x00, // 10 memory mode
0xA1, // 12 seg remap 1 (screen orientation)
0xC8, // 13 comscandec () screen orientation change to INC to flip)
0xDA, 0x12, // 14 set compins, height==64 ? 0x12:0x02,
0x81, extVcc?0x9F:0xCF, // 16 set contrast //0x8F
0xD9, extVcc?0x22:0xF1, // 18 set precharge
0xDB, 0x40, // 20 set vcom detect
0xA4, // 22 display all on
0xA6, // 23 display normal (non-inverted)
0xAF // 24 disp on
]);
// commands sent when sending data to the display
var flipCmds = [
0x21, // columns
0, C.OLED_WIDTH-1,
0x22, // pages
0, 7 /* (height>>3)-1 */];
function update(options) {
if (options) {
if (options.height) {
initCmds[4] = options.height-1;
initCmds[15] = options.height==64 || options.height== 48 ? 0x12 : 0x02;
flipCmds[5] = (options.height>>3)-1;
}
if (options.contrast!==undefined) initCmds[17] = options.contrast;
}
}
exports.connect = function(i2c, callback, options) {
update(options);
var oled = Graphics.createArrayBuffer(C.OLED_WIDTH,initCmds[4]+1,1,{vertical_byte : true});
var addr = 0x3C;
if(options) {
if (options.address) addr = options.address;
// reset display if 'rst' is part of options
if (options.rst) digitalPulse(options.rst, 0, 10);
}
setTimeout(function() {
// configure the OLED
initCmds.forEach(function(d) {i2c.writeTo(addr, [0,d]);});
}, 50);
// if there is a callback, call it now(ish)
if (callback !== undefined) setTimeout(callback, 100);
// write to the screen
oled.flip = function() {
// set how the data is to be sent (whole screen)
flipCmds.forEach(function(d) {i2c.writeTo(addr, [0,d]);});
var chunk = new Uint8Array(C.OLED_CHUNK+1);
chunk[0] = C.OLED_CHAR;
for (var p=0; p<this.buffer.length; p+=C.OLED_CHUNK) {
chunk.set(new Uint8Array(this.buffer,p,C.OLED_CHUNK), 1);
i2c.writeTo(addr, chunk);
}
};
// set contrast, 0..255
oled.setContrast = function(c) { i2c.writeTo(addr, 0, 0x81, c); };
// set off
oled.off = function() { i2c.writeTo(addr, 0, 0xAE); }
// set on
oled.on = function() { i2c.writeTo(addr, 0, 0xAF); }
// return graphics
return oled;
};
exports.connectSPI = function(spi, dc, rst, callback, options) {
update(options);
var cs = options?options.cs:undefined;
var oled = Graphics.createArrayBuffer(C.OLED_WIDTH,initCmds[4]+1,1,{vertical_byte : true});
if (rst) digitalPulse(rst,0,10);
setTimeout(function() {
if (cs) digitalWrite(cs,0);
// configure the OLED
digitalWrite(dc,0); // command
spi.write(initCmds);
digitalWrite(dc,1); // data
if (cs) digitalWrite(cs,10);
// if there is a callback, call it now(ish)
if (callback !== undefined) setTimeout(callback, 10);
}, 50);
// write to the screen
oled.flip = function() {
// set how the data is to be sent (whole screen)
if (cs) digitalWrite(cs,0);
digitalWrite(dc,0);// command
spi.write(flipCmds);
digitalWrite(dc,1);// data
spi.write(this.buffer);
if (cs) digitalWrite(cs,1);
};
// set contrast, 0..255
oled.setContrast = function(c) {
if (cs) cs.reset();
spi.write(0x81,c,dc);
if (cs) cs.set();
};
// set off
oled.off = function() {
if (cs) cs.reset();
spi.write(0xAE,dc);
if (cs) cs.set();
};
// set on
oled.on = function() {
if (cs) cs.reset();
spi.write(0xAF,dc);
if (cs) cs.set();
};
// return graphics
return oled;
};