Problems with UART running ble_app_uart_c on nRF52832

[kont40]

Hello, I am trying to run the ble_app_uart_c example that is part of the nRF5_SDK_13.1.0_7ca7556 on a custom board with nRF52832 using IAR. Hardware seems healthy, I succeeded to run LEDs and make them blink... I am having troubles with running the UART, however:

Initialization of UART is as follows:

const app_uart_comm_params_t comm_params =
  {
    .rx_pin_no    = RX_PIN_NUMBER,
    .tx_pin_no    = TX_PIN_NUMBER,
    .rts_pin_no   = RTS_PIN_NUMBER,
    .cts_pin_no   = CTS_PIN_NUMBER,
    .flow_control = APP_UART_FLOW_CONTROL_DISABLED,
    .use_parity   = false,
    .baud_rate    = UART_BAUDRATE_BAUDRATE_Baud115200
  }; 

and also:

#define RX_PIN_NUMBER  NULL
#define TX_PIN_NUMBER  7 
#define CTS_PIN_NUMBER NULL
#define RTS_PIN_NUMBER NULL
#define HWFC           false

After running uart_init(); passes with success (I have played with LEDs to get the result), however the debug lines

printf("BLE UART central example started.\r\n");
NRF_LOG_INFO("BLE UART central example started.\r\n");

do not produce any output on the TX pin.

Also, in the main loop I have the following:

for (;;)
{
    //power_manage();
  
  bsp_board_led_off(0);       
  bsp_board_led_on(1);
  nrf_delay_ms(3000);
  bsp_board_led_off(1);
  bsp_board_led_on(0);
  nrf_delay_ms(3000);  

}

When the uart_init() is commented/disabled I can get the two LEDs blinking, if uart_init() is not commented and gets executed only one LEDs is always lit, which means the nrf_delay_ms is not executed properly.

Since I am dealing with ble_app_uart_c for first time, I am not quite sure where to search for the problem, any advice would be helpful.

[kont40]

And still: when I comment out uart_init and printf the other parts run and the LED behaves quite intelligently, so I could guess the application otherwise runs well. So just need to figure out what is the problem with the UART init, and why I was able to observe the whole app (including the UART) work well once. The code of the ble example I am trying:

int main(void) { timer_init(); SEGGER_RTT_WriteString(0, "Hello World!\n"); //uart_init();

log_init();
buttons_leds_init();
db_discovery_init();
ble_stack_init();
gatt_init();
nus_c_init();

// // // Start scanning for peripherals and initiate connection // // with devices that advertise NUS UUID. //printf("BLE UART central example started.\r\n"); NRF_LOG_INFO("BLE UART central example started.\r\n"); scan_start();

for (;;)
{
    power_manage();
}

}