UAER Printf shows noting using nRF52840 dongle and a USB to TTL module (Arduino Uno as the USB to TTL)

[AbbaS7]

Hello,

I am trying to send "Hello" through the UART and the nrf52840 dongle using a USB to TTL approach. The main.c code and the sdk_confg.h are uploaded here. The problem is that neither printf nor the NRF_LOG_INFO command shows nothing at the serial monitor!
Please note that in the configuration, ble, uart, spi, and PWM is enabled since this is the final thing that I need.

I have done the ble+pwm+spi and it works fine. The only problem now is that I need UART to see the SPI data and this simple code for the UART does not work!

BTW, I have checked the USB to ttl and it works fine. I have used to Arduino to send hello using uart with that and it works!

Can you please help me with this part?

Thanks,

Abbas

Fullscreen 18830.main.c Download

#include "nrf_drv_spi.h"
#include "app_util_platform.h"
#include "nrf_gpio.h"
#include "nrf_delay.h"
#include "boards.h"
#include "app_error.h"
#include <string.h>
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"

//UART
#include "nrf_uart.h"
#include "app_uart.h"
// I have also added      APP_UART_ENABLED    and    APP_FIFO_Enabled     in the sdk_confg
// Also I have added app_fifo   and app_uart.h    path   to the Keil
//UART

#define UART_TX_BUFF_SIZE 128 // TX buffer size
#define UART_RX_BUFF_SIZE 128 // RX Buffer size


#define UART_HWFC APP_UART_FLOW_CONTROL_DISABLED


// A simple error handler for uart if something goes wrong...
void uart_err_handle(app_uart_evt_t * p)
{
  
}

int main(void)
{
  uint32_t err_code; // a variable to hold the error value

  bsp_board_init(BSP_INIT_LEDS); // initialize leds


  const app_uart_comm_params_t com_params = // struct to hold the uart configurations
  {
    #define RX_PIN_NUMBER NRF_GPIO_PIN_MAP(0,29),
    #define TX_PIN_NUMBER NRF_GPIO_PIN_MAP(0,02),
    #define RTS_PIN_NUMBER UART_PIN_DISCONNECTED,
    #define CTS_PIN_NUMBER UART_PIN_DISCONNECTED,
    UART_HWFC, // hardware flow control disabled
    false, // parity = none
    NRF_UART_BAUDRATE_115200 // set this baud rate for communication

  };

// pass all the values to this function to initialize the UART module
 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); // check if everything initialized correctly

  while(1)
  {
		
		printf("Hello PC from nordic Device!!\r\n");
		nrf_delay_ms(1000);
		NRF_LOG_INFO("Hello!\r\n");
			bsp_board_led_invert(BSP_BOARD_LED_2);
      nrf_delay_ms(4000);
			bsp_board_led_invert(BSP_BOARD_LED_2);
		nrf_delay_ms(1000);
    } // while loop closed
} // main function closed


/** @} */

50045.sdk_config.h

[AbbaS7]

It solved!

The problem was with the rx tx pin definitions

it should be defined something like the following:

    #define rx_pin_no 29
    #define tx_pin_no 31
    #define rts_pin_no 45
    #define cts_pin_no 47
    
      const app_uart_comm_params_t com_params = // struct to hold the uart configurations
  {
					rx_pin_no,
					tx_pin_no,
					rts_pin_no,
					cts_pin_no,
					UART_HWFC, // hardware flow control disabled
					false, // parity = none
					NRF_UART_BAUDRATE_115200 // set this baud rate for communication

  };

Bests,

Abbas