/* Copyright (c) 2012 Nordic Semiconductor. All Rights Reserved.

*

* The information contained herein is property of Nordic Semiconductor ASA.

* Terms and conditions of usage are described in detail in NORDIC

* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.

*

* Licensees are granted free, non-transferable use of the information. NO

* WARRANTY of ANY KIND is provided. This heading must NOT be removed from

* the file.

*

*/

/** @file

*

* @defgroup ble_sdk_uart_over_ble_main main.c

* @{

* @ingroup ble_sdk_app_nus_eval

* @brief UART over BLE application main file.

*

* This file contains the source code for a sample application that uses the Nordic UART service.

* This application uses the @ref srvlib_conn_params module.

*/

#include <stdint.h>

#include <string.h>

#include "nordic_common.h"

#include "nrf.h"

#include "nrf51_bitfields.h"

#include "ble_hci.h"

#include "ble_advdata.h"

#include "ble_conn_params.h"

#include "softdevice_handler.h"

#include "app_timer.h"

#include "app_button.h"

#include "ble_nus.h"

#include "app_uart.h"

#include "uart_conf.h"

#include "boards.h"

#include "ble_error_log.h"

#include "ble_debug_assert_handler.h"

#include "app_util_platform.h"

#include "app_gpiote.h"

#define IS_SRVC_CHANGED_CHARACT_PRESENT 0 /**< Include or not the service_changed characteristic. if not enabled, the server's database cannot be changed for the lifetime of the device*/

#define WAKEUP_BUTTON_PIN BUTTON_0 /**< Button used to wake up the application. */

#define ADVERTISING_LED_PIN_NO LED_0 /**< LED to indicate advertising state. */

#define CONNECTED_LED_PIN_NO LED_1 /**< LED to indicate connected state. */

#define DEVICE_NAME "Nordic_UART" /**< Name of device. Will be included in the advertising data. */

#define APP_ADV_INTERVAL 64 /**< The advertising interval (in units of 0.625 ms. This value corresponds to 40 ms). */

#define APP_ADV_TIMEOUT_IN_SECONDS 180 /**< The advertising timeout (in units of seconds). */

#define APP_TIMER_PRESCALER 0 /**< Value of the RTC1 PRESCALER register. */

#define APP_TIMER_MAX_TIMERS 2 /**< Maximum number of simultaneously created timers. */

#define APP_TIMER_OP_QUEUE_SIZE 4 /**< Size of timer operation queues. */

#define MIN_CONN_INTERVAL MSEC_TO_UNITS(100, UNIT_1_25_MS) /**< Connection interval (100 ms), Connection interval uses 1.25 ms units. */

#define MAX_CONN_INTERVAL MSEC_TO_UNITS(200, UNIT_1_25_MS) /**< Connection interval (200 ms), Connection interval uses 1.25 ms units. */

#define SLAVE_LATENCY 4 /**< slave latency. */

#define CONN_SUP_TIMEOUT MSEC_TO_UNITS(4000, UNIT_10_MS) /**< Connection supervisory timeout (4 seconds), Supervision Timeout uses 10 ms units. */

#define FIRST_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(5000, APP_TIMER_PRESCALER) /**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (5 seconds). */

#define NEXT_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(30000, APP_TIMER_PRESCALER) /**< Time between each call to sd_ble_gap_conn_param_update after the first call (30 seconds). */

#define MAX_CONN_PARAMS_UPDATE_COUNT 3 /**< Number of attempts before giving up the connection parameter negotiation. */

#define BUTTON_DETECTION_DELAY APP_TIMER_TICKS(50, APP_TIMER_PRESCALER) /**< Delay from a GPIOTE event until a button is reported as pushed (in number of timer ticks). */

#define SEC_PARAM_TIMEOUT 30 /**< Timeout for Pairing Request or Security Request (in seconds). */

#define SEC_PARAM_BOND 1 /**< Perform bonding. */

#define SEC_PARAM_MITM 0 /**< Man In The Middle protection not required. */

#define SEC_PARAM_IO_CAPABILITIES BLE_GAP_IO_CAPS_NONE /**< No I/O capabilities. */

#define SEC_PARAM_OOB 0 /**< Out Of Band data not available. */

#define SEC_PARAM_MIN_KEY_SIZE 7 /**< Minimum encryption key size. */

#define SEC_PARAM_MAX_KEY_SIZE 16 /**< Maximum encryption key size. */

#define START_STRING "Start...\n" /**< The string that will be sent over the UART when the application starts. */

#define DEAD_BEEF 0xDEADBEEF /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */

#define APP_GPIOTE_MAX_USERS 1

static ble_gap_sec_params_t m_sec_params; /**< Security requirements for this application. */

static uint16_t m_conn_handle = BLE_CONN_HANDLE_INVALID; /**< Handle of the current connection. */

static ble_nus_t m_nus; /**< Structure to identify the Nordic UART Service. */

static bool ble_buffer_available = true;

static bool tx_complete = false;

/**@brief Error handler function, which is called when an error has occurred.

*

* @warning This handler is an example only and does not fit a final product. You need to analyze

* how your product is supposed to react in case of error.

*

* @param[in] error_code Error code supplied to the handler.

* @param[in] line_num Line number where the handler is called.

* @param[in] p_file_name Pointer to the file name.

*/

void app_error_handler(uint32_t error_code, uint32_t line_num, const uint8_t * p_file_name)

{

// This call can be used for debug purposes during application development.

// @note CAUTION: Activating this code will write the stack to flash on an error.

// This function should NOT be used in a final product.

// It is intended STRICTLY for development/debugging purposes.

// The flash write will happen EVEN if the radio is active, thus interrupting

// any communication.

// Use with care. Un-comment the line below to use.

//ble_debug_assert_handler(error_code, line_num, p_file_name);

// On assert, the system can only recover with a reset.

NVIC_SystemReset();

}

/**@brief Assert macro callback function.

*

* @details This function will be called in case of an assert in the SoftDevice.

*

* @warning This handler is an example only and does not fit a final product. You need to

* analyze how your product is supposed to react in case of Assert.

* @warning On assert from the SoftDevice, the system can only recover on reset.

*

* @param[in] line_num Line number of the failing ASSERT call.

* @param[in] file_name File name of the failing ASSERT call.

*/

void assert_nrf_callback(uint16_t line_num, const uint8_t * p_file_name)

{

app_error_handler(DEAD_BEEF, line_num, p_file_name);

}

/**@brief Function for the LEDs initialization.

*

* @details Initializes all LEDs used by this application.

*/

static void leds_init(void)

{

nrf_gpio_cfg_output(ADVERTISING_LED_PIN_NO);

nrf_gpio_cfg_output(CONNECTED_LED_PIN_NO);

}

/**@brief Function for Timer initialization.

*

* @details Initializes the timer module.

*/

static void timers_init(void)

{

// Initialize timer module

APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_MAX_TIMERS, APP_TIMER_OP_QUEUE_SIZE, false);

}

/**@brief Function for the GAP initialization.

*

* @details This function will setup all the necessary GAP (Generic Access Profile)

* parameters of the device. It also sets the permissions and appearance.

*/

static void gap_params_init(void)

{

uint32_t err_code;

ble_gap_conn_params_t gap_conn_params;

ble_gap_conn_sec_mode_t sec_mode;

BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);

err_code = sd_ble_gap_device_name_set(&sec_mode,

(const uint8_t *) DEVICE_NAME,

strlen(DEVICE_NAME));

APP_ERROR_CHECK(err_code);

memset(&gap_conn_params, 0, sizeof(gap_conn_params));

gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL;

gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL;

gap_conn_params.slave_latency = SLAVE_LATENCY;

gap_conn_params.conn_sup_timeout = CONN_SUP_TIMEOUT;

err_code = sd_ble_gap_ppcp_set(&gap_conn_params);

APP_ERROR_CHECK(err_code);

}

/**@brief Function for the Advertising functionality initialization.

*

* @details Encodes the required advertising data and passes it to the stack.

* Also builds a structure to be passed to the stack when starting advertising.

*/

static void advertising_init(void)

{

uint32_t err_code;

ble_advdata_t advdata;

ble_advdata_t scanrsp;

uint8_t flags = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;

ble_uuid_t adv_uuids[] = {{BLE_UUID_NUS_SERVICE, m_nus.uuid_type}};

memset(&advdata, 0, sizeof(advdata));

advdata.name_type = BLE_ADVDATA_FULL_NAME;

advdata.include_appearance = false;

advdata.flags.size = sizeof(flags);

advdata.flags.p_data = &flags;

memset(&scanrsp, 0, sizeof(scanrsp));

scanrsp.uuids_complete.uuid_cnt = sizeof(adv_uuids) / sizeof(adv_uuids[0]);

scanrsp.uuids_complete.p_uuids = adv_uuids;

err_code = ble_advdata_set(&advdata, &scanrsp);

APP_ERROR_CHECK(err_code);

}

/**@brief Function for handling the data from the Nordic UART Service.

*

* @details This function will process the data received from the Nordic UART BLE Service and send

* it to the UART module.

*/

/**@snippet [Handling the data received over BLE] */

void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)

{

for (int i = 0; i < length; i++)

{

app_uart_put(p_data[i]);

}

app_uart_put('\n');

}

/**@snippet [Handling the data received over BLE] */

/**@brief Function for initializing services that will be used by the application.

*/

static void services_init(void)

{

uint32_t err_code;

ble_nus_init_t nus_init;

memset(&nus_init, 0, sizeof(nus_init));

nus_init.data_handler = nus_data_handler;

err_code = ble_nus_init(&m_nus, &nus_init);

APP_ERROR_CHECK(err_code);

}

/**@brief Function for initializing security parameters.

*/

static void sec_params_init(void)

{

m_sec_params.timeout = SEC_PARAM_TIMEOUT;

m_sec_params.bond = SEC_PARAM_BOND;

m_sec_params.mitm = SEC_PARAM_MITM;

m_sec_params.io_caps = SEC_PARAM_IO_CAPABILITIES;

m_sec_params.oob = SEC_PARAM_OOB;

m_sec_params.min_key_size = SEC_PARAM_MIN_KEY_SIZE;

m_sec_params.max_key_size = SEC_PARAM_MAX_KEY_SIZE;

}

/**@brief Function for handling an event from the Connection Parameters Module.

*

* @details This function will be called for all events in the Connection Parameters Module

* which are passed to the application.

*

* @note All this function does is to disconnect. This could have been done by simply setting

* the disconnect_on_fail config parameter, but instead we use the event handler

* mechanism to demonstrate its use.

*

* @param[in] p_evt Event received from the Connection Parameters Module.

*/

static void on_conn_params_evt(ble_conn_params_evt_t * p_evt)

{

uint32_t err_code;

if(p_evt->evt_type == BLE_CONN_PARAMS_EVT_FAILED)

{

err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE);

APP_ERROR_CHECK(err_code);

}

}

/**@brief Function for handling errors from the Connection Parameters module.

*

* @param[in] nrf_error Error code containing information about what went wrong.

*/

static void conn_params_error_handler(uint32_t nrf_error)

{

APP_ERROR_HANDLER(nrf_error);

}

/**@brief Function for initializing the Connection Parameters module.

*/

static void conn_params_init(void)

{

uint32_t err_code;

ble_conn_params_init_t cp_init;

memset(&cp_init, 0, sizeof(cp_init));

cp_init.p_conn_params = NULL;

cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY;

cp_init.next_conn_params_update_delay = NEXT_CONN_PARAMS_UPDATE_DELAY;

cp_init.max_conn_params_update_count = MAX_CONN_PARAMS_UPDATE_COUNT;

cp_init.start_on_notify_cccd_handle = BLE_GATT_HANDLE_INVALID;

cp_init.disconnect_on_fail = false;

cp_init.evt_handler = on_conn_params_evt;

cp_init.error_handler = conn_params_error_handler;

err_code = ble_conn_params_init(&cp_init);

APP_ERROR_CHECK(err_code);

}

/**@brief Function for starting advertising.

*/

static void advertising_start(void)

{

uint32_t err_code;

ble_gap_adv_params_t adv_params;

// Start advertising

memset(&adv_params, 0, sizeof(adv_params));

adv_params.type = BLE_GAP_ADV_TYPE_ADV_IND;

adv_params.p_peer_addr = NULL;

adv_params.fp = BLE_GAP_ADV_FP_ANY;

adv_params.interval = APP_ADV_INTERVAL;

adv_params.timeout = APP_ADV_TIMEOUT_IN_SECONDS;

err_code = sd_ble_gap_adv_start(&adv_params);

APP_ERROR_CHECK(err_code);

nrf_gpio_pin_set(ADVERTISING_LED_PIN_NO);

}

/**@brief Function for the Application's S110 SoftDevice event handler.

*

* @param[in] p_ble_evt S110 SoftDevice event.

*/

static void on_ble_evt(ble_evt_t * p_ble_evt)

{

uint32_t err_code;

static ble_gap_evt_auth_status_t m_auth_status;

ble_gap_enc_info_t * p_enc_info;

switch (p_ble_evt->header.evt_id)

{

case BLE_GAP_EVT_CONNECTED:

nrf_gpio_pin_set(CONNECTED_LED_PIN_NO);

nrf_gpio_pin_clear(ADVERTISING_LED_PIN_NO);

m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;

break;

case BLE_GAP_EVT_DISCONNECTED:

nrf_gpio_pin_clear(CONNECTED_LED_PIN_NO);

m_conn_handle = BLE_CONN_HANDLE_INVALID;

advertising_start();

break;

case BLE_GAP_EVT_SEC_PARAMS_REQUEST:

err_code = sd_ble_gap_sec_params_reply(m_conn_handle,

BLE_GAP_SEC_STATUS_SUCCESS,

&m_sec_params);

APP_ERROR_CHECK(err_code);

break;

case BLE_GATTS_EVT_SYS_ATTR_MISSING:

err_code = sd_ble_gatts_sys_attr_set(m_conn_handle, NULL, 0);

APP_ERROR_CHECK(err_code);

break;

case BLE_GAP_EVT_AUTH_STATUS:

m_auth_status = p_ble_evt->evt.gap_evt.params.auth_status;

break;

case BLE_GAP_EVT_SEC_INFO_REQUEST:

p_enc_info = &m_auth_status.periph_keys.enc_info;

if (p_enc_info->div == p_ble_evt->evt.gap_evt.params.sec_info_request.div)

{

err_code = sd_ble_gap_sec_info_reply(m_conn_handle, p_enc_info, NULL);

APP_ERROR_CHECK(err_code);

}

else

{

// No keys found for this device

err_code = sd_ble_gap_sec_info_reply(m_conn_handle, NULL, NULL);

APP_ERROR_CHECK(err_code);

}

break;

case BLE_GAP_EVT_TIMEOUT:

if (p_ble_evt->evt.gap_evt.params.timeout.src == BLE_GAP_TIMEOUT_SRC_ADVERTISEMENT)

{

nrf_gpio_pin_clear(ADVERTISING_LED_PIN_NO);

// Configure buttons with sense level low as wakeup source.

nrf_gpio_cfg_sense_input(WAKEUP_BUTTON_PIN,

BUTTON_PULL,

NRF_GPIO_PIN_SENSE_LOW);

// Go to system-off mode (this function will not return; wakeup will cause a reset)

err_code = sd_power_system_off();

APP_ERROR_CHECK(err_code);

}

break;

case BLE_EVT_TX_COMPLETE:

if(!ble_buffer_available) tx_complete = true;

break;

default:

// No implementation needed.

break;

}

}

/**@brief Function for dispatching a S110 SoftDevice event to all modules with a S110

* SoftDevice event handler.

*

* @details This function is called from the S110 SoftDevice event interrupt handler after a

* S110 SoftDevice event has been received.

*

* @param[in] p_ble_evt S110 SoftDevice event.

*/

static void ble_evt_dispatch(ble_evt_t * p_ble_evt)

{

ble_conn_params_on_ble_evt(p_ble_evt);

ble_nus_on_ble_evt(&m_nus, p_ble_evt);

on_ble_evt(p_ble_evt);

}

/**@brief Function for the S110 SoftDevice initialization.

*

* @details This function initializes the S110 SoftDevice and the BLE event interrupt.

*/

static void ble_stack_init(void)

{

uint32_t err_code;

// Initialize SoftDevice.

SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, false);

// Enable BLE stack

ble_enable_params_t ble_enable_params;

memset(&ble_enable_params, 0, sizeof(ble_enable_params));

ble_enable_params.gatts_enable_params.service_changed = IS_SRVC_CHANGED_CHARACT_PRESENT;

err_code = sd_ble_enable(&ble_enable_params);

APP_ERROR_CHECK(err_code);

// Subscribe for BLE events.

err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);

APP_ERROR_CHECK(err_code);

}

/**@brief Function for configuring the buttons.

*/

static void buttons_init(void)

{

nrf_gpio_cfg_sense_input(WAKEUP_BUTTON_PIN,

BUTTON_PULL,

NRF_GPIO_PIN_SENSE_LOW);

}

/**@brief Function for placing the application in low power state while waiting for events.

*/

static void power_manage(void)

{

uint32_t err_code = sd_app_evt_wait();

APP_ERROR_CHECK(err_code);

}

void uart_putstring(const uint8_t * str)

{

uint32_t err_code;

uint8_t len = strlen((char *) str);

for (uint8_t i = 0; i < len; i++)

{

err_code = app_uart_put(str[i]);

APP_ERROR_CHECK(err_code);

}

}

/**@brief Function for handling UART interrupts.

*

* @details This function will receive a single character from the UART and append it to a string.

* The string will be be sent over BLE when the last character received was a 'new line'

* i.e '\n' (hex 0x0D) or if the string has reached a length of @ref NUS_MAX_DATA_LENGTH.

*/

void uart_evt_callback(app_uart_evt_t * uart_evt)

{

//uint32_t err_code;

switch (uart_evt->evt_type)

{

case APP_UART_DATA:

//Data is ready on the UART

break;

case APP_UART_DATA_READY:

//Data is ready on the UART FIFO

break;

case APP_UART_TX_EMPTY:

//Data has been successfully transmitted on the UART

break;

default:

break;

}

}

/**@brief Function for initializing the UART module.

*/

static void uart_init(void)

{

uint32_t err_code;

APP_UART_FIFO_INIT(&comm_params,

RX_BUF_SIZE,

TX_BUF_SIZE,

uart_evt_callback,

UART_IRQ_PRIORITY,

err_code);

APP_ERROR_CHECK(err_code);

}

bool ble_attempt_to_send(uint8_t * data, uint8_t length)

{

uint32_t err_code;

err_code = ble_nus_send_string(&m_nus, data,length);

if(err_code == BLE_ERROR_NO_TX_BUFFERS)

{

/* ble tx buffer full*/

return false;

}

else if (err_code != NRF_ERROR_INVALID_STATE)

{

APP_ERROR_CHECK(err_code);

}

return true;

}

/**@brief Function for initializing the GPIOTE handler module.

*/

static void gpiote_init(void)

{

APP_GPIOTE_INIT(APP_GPIOTE_MAX_USERS);

}

/**@brief Application main function.

*/

int main(void)

{

static uint8_t data_array[BLE_NUS_MAX_DATA_LEN];

static uint8_t index = 0;

uint8_t newbyte;

// Initialize

leds_init();

timers_init();

gpiote_init();

buttons_init();

uart_init();

ble_stack_init();

gap_params_init();

services_init();

advertising_init();

conn_params_init();

sec_params_init();

uart_putstring(START_STRING);

advertising_start();

// Enter main loop

for (;;)

{

/*Stop reading new data if there are no ble buffers available */

if(ble_buffer_available)

{

if(app_uart_get(&newbyte) == NRF_SUCCESS)

{

data_array[index++] = newbyte;

if (index >= (BLE_NUS_MAX_DATA_LEN))

{

ble_buffer_available=ble_attempt_to_send(&data_array[0],index);

if(ble_buffer_available) index=0;

}

}

}

/* Re-transmission if ble_buffer_available was set to false*/

if(tx_complete)

{

tx_complete=false;

ble_buffer_available=ble_attempt_to_send(&data_array[0],index);

if(ble_buffer_available) index =0;

}

power_manage();

}

}

/**

* @}

*/