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);


}

[Jared]

Hi

The reason for the unpredictable behavior that you are observing is because the nRF52840 only have one UART, it does however have two instances of the UARTE. SDK 15.2.0 includes an example serial_uartes which utilizes two UARTEs, i suggest that you take a look at that example to understand how it is supposed to be used: https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.2.0%2Fserial_uartes_example.html&cp=4_0_0_4_5_36

Jared 

[Rajat]

Hi Jared

The same program and techniquie worked fine for both of the LoRa and Sensor a few days ago.

now its not working as it is supposed to be. 

[Jared]

Hi

Could you share your project files?

Jared