When use the template_project (SDK16) UART working only on debug mode

Question

Hi,

I try to use UART in the template_project. But if I try to use printf UART doesn't work. The project works fine in debug mode. How can i fix the issue?


#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"
#include "nrf_uart.h"

#define UART_TX_BUFF_SIZE 128
#define UART_RX_BUFF_SIZE 128

#define UART_HWFC APP_UART_FLOW_CONTROL_DISABLED
#define LED 8

void uart_err_handle(app_uart_evt_type_t *p)
{

}

int main(void)
{

  uint32_t err_code;

  nrf_gpio_cfg_output(LED);

  const app_uart_comm_params_t com_params = 
  {
    RX_PIN_NUMBER,
    TX_PIN_NUMBER,
    RTS_PIN_NUMBER,
    CTS_PIN_NUMBER,
    UART_HWFC,
    false,
    NRF_UART_BAUDRATE_115200
  };

  APP_UART_FIFO_INIT(&com_params, UART_RX_BUFF_SIZE, UART_TX_BUFF_SIZE, uart_err_handle, APP_IRQ_PRIORITY_LOWEST, err_code);

  APP_ERROR_CHECK(err_code);

  printf("Hello World!\r\n");

  while(true)
  {
    uint8_t cr;

    while( app_uart_get(&cr) != NRF_SUCCESS );// wait here until get character until from pc

    if(cr == 't')
    {
      nrf_gpio_pin_write(LED, 1 );
      printf("Leds Turned On!!\r\n");
    }

    if( cr == 'k')
    {
      nrf_gpio_pin_write(LED, 0 );
      printf("Led Turned Off!!\r\n");
    }

  }