Need to use 2 UARTS on nrf52840

[Rajat]

Hi everyone

The following code is initiaizing the uarts correctly,but there is unpredictable behaviour in this case.

Whenever i disable the 1 UART sensor, works fine.

but on enabling both uart sensor , one of the sensor gets stucked.

Is this code fine to use 2 uarts?

void uart_init_terra(int pin_rx,int pin_tx)
{
uint32_t err_code;

    bsp_board_init(BSP_INIT_LEDS);

    const app_uart_comm_params_t comm_params =
      {
          pin_rx,
          pin_tx,
          24,//RTS_PIN_NUMBER,
          25,//CTS_PIN_NUMBER,
          UART_HWFC,
          false,
#if defined (UART_PRESENT)
          NRF_UART_BAUDRATE_57600
#endif
      };

    APP_UART_FIFO_INIT(&comm_params,
                         UART_RX_BUF_SIZE,
                         UART_TX_BUF_SIZE,
                         uart_error_handle,
                         APP_IRQ_PRIORITY_LOWEST,
                         err_code);
    if(err_code==0)
     SEGGER_RTT_printf(0,"UART ERROR CODE :%d\r\n",err_code);
     else
     SEGGER_RTT_printf(0,"UART ERROR CODE :%d\r\n",err_code);
    APP_ERROR_CHECK(err_code);
    APP_ERROR_CHECK(err_code);


}

void uart_init_terra_copy(int pin_rx,int pin_tx)
{
uint32_t err_code;

    bsp_board_init(BSP_INIT_LEDS);

    const app_uart_comm_params_t comm_params =
      {
          pin_rx,
          pin_tx,
          24,//RTS_PIN_NUMBER,
          25,//CTS_PIN_NUMBER,
          UART_HWFC,
          false,
#if defined (UART_PRESENT)
          NRF_UART_BAUDRATE_19200
#endif
      };

    APP_UART_FIFO_INIT(&comm_params,
                         UART_RX_BUF_SIZE,
                         UART_TX_BUF_SIZE,
                         uart_error_handle,
                         APP_IRQ_PRIORITY_LOWEST,
                         err_code);

       if(err_code==0)
     SEGGER_RTT_printf(0,"UART ERROR CODE :%d\r\n",err_code);
     else
     SEGGER_RTT_printf(0,"UART ERROR CODE :%d\r\n",err_code);
    APP_ERROR_CHECK(err_code);
    APP_ERROR_CHECK(err_code);


}

[awneil]

Rajat said:

one of the sensor gets stucked

How & Where, exactly, does it get "stuck"?

Are you sure you're not also trying to do debug logging over one of the UARTs ?

[Rajat]

Sensor_read function is using the uart with "uart_init_terra_copy" function and LoRa uses uart_init_terra function.

Whenever the sensor-read function is called ,it works fine but if after that i call lora send function , it gets stucked in app_uart_get function inside the lora send function.

However if i comment out the sensor_read function, it works fine.

                    int k = sensor_read ();
                            if (k == ERROR)
                                {
                                    SEGGER_RTT_printf (
                                        0, "Sensor Read Fail \r\n");
                                }
                                       
                                
                                 test_ack=lora_send ("Test");
          SEGGER_RTT_printf(0,"ACK:%d\r\n",test_ack);
          nrf_delay_ms (15000);

[awneil]

Rajat said:

it gets stucked in app_uart_get function

So, again: How & Where, exactly, does it get "stuck" in that function?

[Rajat]

while ((cnf_data[pos++] = uart_read_data ()) != 0x0A)
                {
                     //SEGGER_RTT_printf(0," Stucked Here\r\n");
                    // cnf_data[pos]);
                    // pos++;
                }
            cnf_data[pos] = 0;

            SEGGER_RTT_printf (0, " Data from lora:%s \r\n", cnf_data);

Inside the while statement where i am checking for uart_read_data != 0x0A .