Bluetooth
===============

For Bluetooth communication, Nordic SDK is used (nRF5_SDK_17.0.0_9d13099. ble_app_uart example found in SDK is used as template for this project. Wanted functionality is used by modifying code. in following defines, Device name 
have been changed.

.. code-block:: C

	#define APP_BLE_CONN_CFG_TAG            1                                           /**< A tag identifying the SoftDevice BLE configuration. */

	#define DEVICE_NAME                     "Nordic_malzca_UART"                               /**< Name of device. Will be included in the advertising data. */
	#define NUS_SERVICE_UUID_TYPE           BLE_UUID_TYPE_VENDOR_BEGIN                  /**< UUID type for the Nordic UART Service (vendor specific). */

	#define APP_BLE_OBSERVER_PRIO           3                                           /**< Application's BLE observer priority. You shouldn't need to modify this value. */

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

	#define APP_ADV_DURATION                18000                                       /**< The advertising duration (180 seconds) in units of 10 milliseconds. */

	#define MIN_CONN_INTERVAL               MSEC_TO_UNITS(20, UNIT_1_25_MS)             /**< Minimum acceptable connection interval (20 ms), Connection interval uses 1.25 ms units. */
	#define MAX_CONN_INTERVAL               MSEC_TO_UNITS(75, UNIT_1_25_MS)             /**< Maximum acceptable connection interval (75 ms), Connection interval uses 1.25 ms units. */
	#define SLAVE_LATENCY                   0                                           /**< 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)                       /**< 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)                      /**< 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 DEAD_BEEF                       0xDEADBEEF                                  /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */

	#define UART_TX_BUF_SIZE                256                                         /**< UART TX buffer size. */
	#define UART_RX_BUF_SIZE                256                                         /**< UART RX buffer size. */
	
Following code is used to receive data from Nordic android application and modifying PWM based on received data.
	
.. code-block:: C

	/**@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.
	 *
	 * @param[in] p_evt       Nordic UART Service event.
	 */
	/**@snippet [Handling the data received over BLE] */
	static void nus_data_handler(ble_nus_evt_t * p_evt)
	{

		if (p_evt->type == BLE_NUS_EVT_RX_DATA)
		{
			uint32_t err_code;
	  
			if(p_evt->params.rx_data.length==4){
			  rx_size=p_evt->params.rx_data.length;
			  bufferiino[0]=p_evt->params.rx_data.p_data[0];
			  bufferiino[1]=p_evt->params.rx_data.p_data[1];
			  bufferiino[2]=p_evt->params.rx_data.p_data[2];
			  bufferiino[3]=p_evt->params.rx_data.p_data[3];
			  if(bufferiino[0]=='c'){
				if(bufferiino[1]=='1'){
					unsigned char tmp_buf[2];
					tmp_buf[0]= bufferiino[2];
					tmp_buf[1]= bufferiino[3];

					PWM0_1[0]=100-atoi(tmp_buf);
					NRF_PWM0->TASKS_SEQSTART[0]=1;
					lcdbuf[4]=tmp_buf[0];
					lcdbuf[5]=tmp_buf[1];
					lcdkirj();

				}

				else if(bufferiino[1]=='2'){
					unsigned char tmp_buf[2];
					tmp_buf[0]= bufferiino[2];
					tmp_buf[1]= bufferiino[3];

					PWM0_1[1]=100-atoi(tmp_buf);
					NRF_PWM0->TASKS_SEQSTART[0]=1;
					lcdbuf[12]=tmp_buf[0];
					lcdbuf[13]=tmp_buf[1];
					lcdkirj();

				}

				else if(bufferiino[1]=='3'){
					unsigned char tmp_buf[2];
					tmp_buf[0]= bufferiino[2];
					tmp_buf[1]= bufferiino[3];

					PWM2_3[0]=100-atoi(tmp_buf);
					NRF_PWM1->TASKS_SEQSTART[0]=1;
					lcdbuf[20]=tmp_buf[0];
					lcdbuf[21]=tmp_buf[1];
					lcdkirj();

				}

				else if(bufferiino[1]=='4'){
					unsigned char tmp_buf[2];
					tmp_buf[0]= bufferiino[2];
					tmp_buf[1]= bufferiino[3];

					PWM2_3[1]=100-atoi(tmp_buf);
					NRF_PWM1->TASKS_SEQSTART[0]=1;
					lcdbuf[28]=tmp_buf[0];
					lcdbuf[29]=tmp_buf[1];
					lcdkirj();

				}


			  }
	  


			}
		}

	}