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.
#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.
/**@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();
}
}
}
}
}