RE: Changing the UART TX RX pins

[Houman]

Hi,

I am having difficulty changing the UART Tx/Rx pins of nrf52840 (custom board) in the direct_test_mode example project in the SDK 16.0.0.

Based on https://infocenter.nordicsemi.com/index.jsp?topic=%2Fsdk_nrf5_v16.0.0%2Findex.html

I should be able to easy modify these pins:

"The default selection of GPIO pins are pin 8 for RX and pin 6 for TX. These defaults are defined in <InstallFolder>\examples\bsp\board.h and can be changed by editing the values of the symbols RX_PIN_NUMBER and TX_PIN_NUMBER"

But the <InstallFolder>\examples\bsp does not exist in SDK 16.0.0, Where are these files?And also which compiler can I use to compile the project?

Thank you

[haakonsh]

You don't need to redefine the RX and TX pins in the pca10056.h file, you can just modify the main.c to use whatever pins you want for RX and TX: 

#define DTM_RX_PIN NRF_GPIO_PIN_MAP(0, 11) // p0.11
#define DTM_TX_PIN NRF_GPIO_PIN_MAP(1, 08) // p1.08


/**@brief Function for UART initialization.
 */
static void uart_init(void)
{   
    uint32_t err_code;
    const app_uart_comm_params_t comm_params =
      {
          DTM_RX_PIN,
          DTM_TX_PIN,
          RTS_PIN_NUMBER,
          CTS_PIN_NUMBER,
          APP_UART_FLOW_CONTROL_DISABLED,
          false,
          DTM_BITRATE
      };

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

    APP_ERROR_CHECK(err_code);
}

The SDK supports SES, Keil, IAR, and GCC.