Including "app_uart.h" in main program of 'simple_coap_server' example

[Roger]

HI All,

I wonder if someone can help me out. I would like to send serial data by modifying the 'simple_coap_server' main program. I added the following header 'app_uart.h' to make use of the functions but when I compile the program using GCC ('make' command in Windows), I get No such file or directory #include "app_uart.h". What I don't understand is that the file is in the directory and that I can compile the 'UART' example using GCC successfully without any problems. Any thoughts please, maybe I'm missing something?

Roger

[Roger]

Hello Jørgen,

Seems like there is something still missing which I don't fully understand. The 'simple_coap_server' compiles with no error after including $(SDK_ROOT)/components/libraries/uart \ in the INC_FOLDER of the Makefile. However, after including the following code from the 'UART' example to the main of 'simple_coap_server' example':

int main(void) {

uint32_t err_code;

const app_uart_comm_params_t comm_params =
  {
      RX_PIN_NUMBER,
      TX_PIN_NUMBER,
      RTS_PIN_NUMBER,
      CTS_PIN_NUMBER,
      APP_UART_FLOW_CONTROL_ENABLED,
      false,
      UART_BAUDRATE_BAUDRATE_Baud115200
  };

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);

printf("\r\nStart: \r\n");

while (true)
{
    uint8_t cr;
    while (app_uart_get(&cr) != NRF_SUCCESS);
    while (app_uart_put(cr) != NRF_SUCCESS);

    if (cr == 'q' || cr == 'Q')
    {
        printf(" \r\nExit!\r\n");

        while (true)
        {
            // Do nothing.
        }

    }

}

I get the following error:

It seems that the functions of "app_uart.h" used in main are still undefined. In the 'UART' example, I also checked that the headers and source files in the Makefile, are also included in the 'simple_coap_server' Makefile, but I still get an undefined reference to the functions.

Are there perhaps any other files that need to be included? Any thoughts?

Roger

[Roger]

Thanks again. Very helpful.