nrf52840 NUS and UART

[syamkrishnan]

Hi,

Iam working on a nrf52840 and trying to achieve  data flow from BLE device using NUS and transfer this data through UART.Uart is configured as (TX:P1.01,RX:P1.02).Iam receiving data in 

 nus_data_handler, and expecting app_uart_put will send data to TX which can be received by UART connected device  RX.I can see that data is looping back to sender.Iam using  NUS added 

ble_peripheral\ble_app_template 

static void uart_init(void) {
  uint32_t err_code;
  app_uart_comm_params_t const comm_params =
  {
    // .rx_pin_no    = RX_PIN_NUMBER,
    // .tx_pin_no    = TX_PIN_NUMBER,
    .rx_pin_no = NRF_GPIO_PIN_MAP(1, 1),
    .tx_pin_no = NRF_GPIO_PIN_MAP(1, 2),
    .rts_pin_no = RTS_PIN_NUMBER,
    .cts_pin_no = CTS_PIN_NUMBER,
    .flow_control = APP_UART_FLOW_CONTROL_DISABLED,
    .use_parity = false,
#if defined(UART_PRESENT)
    .baud_rate = NRF_UART_BAUDRATE_115200
#else
    .baud_rate = NRF_UARTE_BAUDRATE_115200
#endif
  };

  APP_UART_FIFO_INIT(&comm_params,
      UART_RX_BUF_SIZE,
      UART_TX_BUF_SIZE,
      uart_event_handle,
      APP_IRQ_PRIORITY_LOWEST,
      err_code);
  APP_ERROR_CHECK(err_code);
}

static void nus_data_handler(ble_nus_evt_t *p_evt) {
  ret_code_t ret_val;
  if (p_evt->type == BLE_NUS_EVT_RX_DATA) {
    uint32_t err_code;
   
    NRF_LOG_INFO("Received data from BLE NUS. Writing data on UART.");
    NRF_LOG_HEXDUMP_DEBUG(p_evt->params.rx_data.p_data, p_evt->params.rx_data.length);

    for (uint32_t i = 0; i < p_evt->params.rx_data.length; i++) {
      do {
        err_code = app_uart_put(p_evt->params.rx_data.p_data[i]);

        if ((err_code != NRF_SUCCESS) && (err_code != NRF_ERROR_BUSY)) {
          NRF_LOG_ERROR("Failed receiving NUS message. Error 0x%x. ", err_code);
          APP_ERROR_CHECK(err_code);
        }
    
      } while (err_code == NRF_ERROR_BUSY);
    
    }

    if (p_evt->params.rx_data.p_data[p_evt->params.rx_data.length - 1] == '\r') {
      while (app_uart_put('\n') == NRF_ERROR_BUSY)
        ;
    }
  } else if (p_evt->type == BLE_NUS_EVT_TX_RDY) {
    flag_transmitted = 1;

    NRF_LOG_INFO("TX OK");
  
  } else if (p_evt->type == BLE_NUS_EVT_COMM_STARTED) {

    NRF_LOG_INFO("BLE_NUS_EVT_COMM_STARTED");
    //TODO : add send START command if required
    //   SendData();
    flag_connected = 1;
 
  }
}

Please advice whether and how can I use this.

Thanks

Syam