rx_buf size

[Dcrossd]

I am interfacing sim 808 which is a uart based module with my nrf device. 

The default buffer size is 256, can i increase this buffer size? If so how?

Also how do I clear my rx_buf?

sometimes while executing the code a file named app_error_weak.c opens and the execution terminates, Why does this happen?

[awneil]

What SDK are you using?

And what modules/drivers are you using for the UART?

Dcrossd said:

while executing the code a file named app_error_weak.c opens

That means your code has hit an error or Hard Fault, and you've reached the error handler.

The error handler contains a breakpoint, so you IDE stops the execution and shows you the current location - which is in app_error_weak.c 

[Dcrossd]

nRF5_SDK_15.3.0_59ac345 this is the SDK I am using.

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include "app_uart.h"
#include "app_error.h"
#include "nrf_delay.h"
#include "nrf.h"
#include "bsp.h"
#if defined (UART_PRESENT)
#include "nrf_uart.h"
#endif
#if defined (UARTE_PRESENT)
#include "nrf_uarte.h"
#endif

these are all my included files 

[awneil]

The list of includes doesn't really help: they could be included but not used; and, as shown some of them are conditional.

You modules/drivers are you using for the UART ?

How to properly post source code:

[Dcrossd]

These are the uart libraries used 

These are the drivers 

this the part of code where the size of the buffers are defined

#define MAX_TEST_DATA_BYTES     (15U)                /**< max number of test bytes to be used for tx and rx. */
#define UART_TX_BUF_SIZE 256                         /**< UART TX buffer size. */
#define UART_RX_BUF_SIZE 256                         /**< UART RX buffer size. */

void uart_error_handle(app_uart_evt_t * p_event)
{
    if (p_event->evt_type == APP_UART_COMMUNICATION_ERROR)
    {
        APP_ERROR_HANDLER(p_event->data.error_communication);
    }
    else if (p_event->evt_type == APP_UART_FIFO_ERROR)
    {
        APP_ERROR_HANDLER(p_event->data.error_code);
    }
}

int main(void)
{
    uint32_t err_code;

    bsp_board_init(BSP_INIT_LEDS);

    const app_uart_comm_params_t comm_params =
      {
          RX_PIN_NUMBER,
          TX_PIN_NUMBER,
          RTS_PIN_NUMBER,
          CTS_PIN_NUMBER,
          UART_HWFC,
          false,
#if defined (UART_PRESENT)
          NRF_UART_BAUDRATE_9600
#else
          NRF_UARTE_BAUDRATE_115200
#endif
      };

    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);

but if i try to change the buffer size it opens the error file previously mentioned