What should I do if a fatal error occurs when running APP_UART_FIFO_INIT?

[psj]

sdk12.3.0
In the ble_app_hrs_rscs_relay example, I added the uart_init function referring to the ble_uart example, but when I execute the APP_UART_FIFO_INIT () function, a fatal error occurs. Is there a workaround?

[Simon]

I was able to make it work by following the steps given by Petter Myhre in this answer. First complete step 1 and 2, then in step 3 you need to do some modification to the sdk_config file belonging to the ble_app_hrs_rscs_relay project.

• Search for APP_FIFO_ENABLED and RETARGET_ENABLED in the sdk_config file of the ble_app_uart project and copy out the parts shown below

// <q> APP_FIFO_ENABLED  - app_fifo - Software FIFO implementation
 

#ifndef APP_FIFO_ENABLED
#define APP_FIFO_ENABLED 1
#endif

.
.
.
.
.
.

// <q> RETARGET_ENABLED  - retarget - Retargeting stdio functions
 

#ifndef RETARGET_ENABLED
#define RETARGET_ENABLED 1
#endif

• Then insert it into the sdk_config file of the relay project
• Remeber to set APP_UART_ENABLED to 1

Add the following code to main:

#include "app_uart.h"
#define UART_TX_BUF_SIZE 256                         /**< UART TX buffer size. */
#define UART_RX_BUF_SIZE 256                         /**< UART RX buffer size. */

/**@snippet [Handling the data received over UART] */
void uart_event_handle(app_uart_evt_t * p_event)
{
			//Handle the event
}

/**@brief  Function for initializing the UART module.
 */
/**@snippet [UART Initialization] */
static void uart_init(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_DISABLED,
        false,
        UART_BAUDRATE_BAUDRATE_Baud115200
    };

    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);
}
/**@snippet [UART Initialization] */

int main(void)
{
    uart_init();
    .
    .
}

Best regards Simon