STM32F446 EXTI GPIO interrupt not triggering

[Mohamed Aymen]

Hello,

I’m working with an STM32F446 and have configured GPIOB pin 12 as an EXTI input. After initialization and before entering the main while loop, I call a function that blocks program execution(what I mean by blocking : I have a test that stands in a blocking while until I receive the first bytes of USART reception) . In this scenario, changing the pin state does not trigger the EXTI interrupt. However, if I comment out this blocking function, the EXTI works as expected. I also observe the same behavior if I insert a while(1) loop before the main loop.

Has anyone experienced similar behavior? If yes, do you know what the solution might be?

Thank you in advance.

Aymen

[mƎALLEm]

Hello @Mohamed Aymen ,

Better to share your main so we can look at it closely.

[Mohamed Aymen]

This is my main 

int main(void)
{

  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration----------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_DMA_Init();
  MX_I2C3_Init();
  MX_SPI3_Init();
  MX_TIM1_Init();
  MX_TIM2_Init();
  MX_USART2_UART_Init();
  MX_ADC1_Init();
  MX_SPI4_Init();
  MX_DAC_Init();
  MX_TIM6_Init();
  MX_USART1_UART_Init();
  MX_TIM5_Init();
  MX_IWDG_Init();

  /* USER CODE BEGIN 2 */

// Init du TIMER pour la pause de 5�S pour l'init des STPM
	HAL_TIM_Base_Start(&htim5) ;

	CalibrationEnCours = TFLAG_FALSE ;
// while(1){HAL_IWDG_Refresh(&hiwdg) ;} // If I uncomment this line, the EXTI no longer functions
// Positionner la demande d'envoi de la configuration par la carte UC (sur scrutation)
  stm32_rs485_wait_config = VRAI;

// Tester la presence des connecteurs au boot
	PresenceConnecteur.flag = TFLAG_TRUE ;

	LancerAutotest = 0 ;

  /* USER CODE END 2 */

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

  /* USER CODE BEGIN 3 */
	// Reinit WATCHDOG
		HAL_IWDG_Refresh(&hiwdg) ;
        .
        .
        .
}

[mƎALLEm]

If you use this code, do you fall into the same behavior? (removed all the stuff, keeping the GPIO config + two while loops):

int main(void)
{

  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration----------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();


  /* USER CODE BEGIN 2 */

 while(1){} // If I uncomment this line, the EXTI no longer functions



// Tester la presence des connecteurs au boot




  /* USER CODE END 2 */

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

  /* USER CODE BEGIN 3 */

        .
        .
        .
}