c - STM32 UART doesn't receive GPS data

Question

I have Nucleo-L476RG board and GPS module. If I connect tx of GPS to rx of STM32 (ex. PA10 - USART1 rx), I receive no data. If I receive data from UART2 (any input from PuTTY is sent back), and if I connect GPS module to Arduino it receive data also. I've tried all UART's for data rx, and now I have no idea. What can be wrong there?

#include "main.h"
#include "usart.h"
#include "gpio.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */

/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

/* USER CODE BEGIN PV */
uint8_t rx_data, MessageLength;
uint8_t Message[64];
/* USER CODE END PV */

void SystemClock_Config(void);

int main(void)
{
  HAL_Init();

  SystemClock_Config();

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_USART2_UART_Init();
  MX_UART4_Init();
  /* USER CODE BEGIN 2 */
  HAL_UART_Receive_IT(&huart1, &rx_data, 1);
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
    if(huart == &huart2)
    {
        MessageLength = sprintf((char*)Message, "char: %d

", rx_data);
        HAL_UART_Transmit(&huart2, &rx_data, 1, 100);
        HAL_UART_Receive_IT(&huart1, &rx_data, 1);
    }
}

question from:https://stackoverflow.com/questions/65852868/stm32-uart-doesnt-receive-gps-data

Answer 1

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