HAL_GPIO_EXTI_Callback() not being triggered

[blade_runner_2004]

I connected a external button on my PCB board and am trying to use it to toggle another GPIO Pin (PA8) with HAL_GPIO_EXTI_Callback()

I connected the button to PC4 on my NUCLEO board and is configured as follow:

/*Configure GPIO pin : PC4 */
GPIO_InitStruct.Pin = GPIO_PIN_4;
GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
GPIO_InitStruct.Pull = GPIO_PULLDOWN;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

In the User Code 4 Section:

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
if(GPIO_Pin == GPIO_PIN_4){
HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_8);
}
}

In stm32g0xx_it.c:

void EXTI4_15_IRQHandler(void)
{
  /* USER CODE BEGIN EXTI4_15_IRQn 0 */
  /* USER CODE END EXTI4_15_IRQn 0 */
  HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_4); // PC4
  HAL_GPIO_EXTI_IRQHandler(B1_Pin);
  /* USER CODE BEGIN EXTI4_15_IRQn 1 */

  /* USER CODE END EXTI4_15_IRQn 1 */
}​

What I dont understand is when I push the button using this configuration it works:
In main while-loop:

if(triggerDetected==1)
  {
  if((HAL_GetTick()-triggerTick)>debounceTime)
  {
  // Toggle relay (if energy units > 0)
  if (units_left > 0.0f) {
  HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_8); // drives relay and D2
  } else {
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_8, GPIO_PIN_RESET); // force off if no units
  }
  //Reset trigger
  triggerDetected=0;
  }
  }

 
In stm32g0xx_it.c:

void EXTI4_15_IRQHandler(void)
{
  /* USER CODE BEGIN EXTI4_15_IRQn 0 */
triggerDetected = 1;
triggerTick = HAL_GetTick();
  /* USER CODE END EXTI4_15_IRQn 0 */
  HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_4); // PC4
  HAL_GPIO_EXTI_IRQHandler(B1_Pin);
  /* USER CODE BEGIN EXTI4_15_IRQn 1 */

  /* USER CODE END EXTI4_15_IRQn 1 */
}

When I handle the PC4 interrupt directly in the interrupt handler, PA8 toggles, but it doesn't work if i handle it in the callback function.

Any idea to fix this please?

[mƎALLEm · Accepted solution]

Hello @blade_runner_2004 and welcome to the ST community,

First, you need to use </> button to share your code. See this post. (updated your post accordingly).

Second, on G0 product there are separated callbacks for Falling and rising edges:

void HAL_GPIO_EXTI_Falling_Callback(uint16_t GPIO_Pin)
void HAL_GPIO_EXTI_Rising_Callback(uint16_t GPIO_Pin)

You can refer to this example: https://github.com/STMicroelectronics/STM32CubeG0/blob/master/Projects/NUCLEO-G0B1RE/Examples/GPIO/GPIO_EXTI/Src/main.c

You didn't mention if you enabled the NVIC.

PS: this thread has no relation with CubeIDE it will be moved to the embedded software forum board.

Hope that helps.

[blade_runner_2004]

Thank You

[mƎALLEm]

If your question has been answered please accept my comment where I answered your question as solution.

Thanks