Callback function for HAL_TIM_OnePulse_Start_IT?

[FwMaker]

How do I get a callback function for the HAL_TIM_OnePulse_Start_IT function?

I have a STM32G071 Nucleo board.

I whish to start a one-shot timer that calls an interrupt callback function when the time has elapsed. For this I have chosen the timer 6 and had the CubeMX, to generate the code:

static void MX_TIM6_Init(void)
{
 
  /* USER CODE BEGIN TIM6_Init 0 */
 
  /* USER CODE END TIM6_Init 0 */
 
  TIM_MasterConfigTypeDef sMasterConfig = {0};
 
  /* USER CODE BEGIN TIM6_Init 1 */
 
  /* USER CODE END TIM6_Init 1 */
  htim6.Instance = TIM6;
  htim6.Init.Prescaler = 3;
  htim6.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim6.Init.Period = 40000;
  htim6.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  if (HAL_TIM_Base_Init(&htim6) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_TIM_OnePulse_Init(&htim6, TIM_OPMODE_SINGLE) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim6, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN TIM6_Init 2 */
 
  /* USER CODE END TIM6_Init 2 */
 
}

I have then tried to start the timer with:

HAL_TIM_OnePulse_Start_IT(&htim6, TIM_CHANNEL_6);

and then tried to get the ISR to toggle the LED with this code:

void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *TimHandle){
	HAL_GPIO_TogglePin(LED4_GPIO_Port, LED4_Pin);
}

And this code:

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *TimHandle){
	HAL_GPIO_TogglePin(LED4_GPIO_Port, LED4_Pin);
}

But none of these are working.

What am I doing wrong?

[Jaroslav JANOS]

Hello,

you have to start the timer with:

HAL_TIM_Base_Start_IT(&htim6);
HAL_TIM_OnePulse_Start_IT(&htim6, TIM_CHANNEL_6);

In your case, the UIE bit in DIER register is not set and the interrupt is not enabled.

The IRQ handler will then call your HAL_TIM_PeriodElapsedCallback() function and toggle the pin.

-- Jaroslav

[FwMaker · Accepted solution]

Thanks for your suggestions Jaroslav

I actually found a solution to the problem, by watching this video; that has a an example that uses OnePulse:

https://www.youtube.com/watch?v=3yvY7pLMHAg&t=289s

And what I found that were missing in order to make my code work was this as a part of the timer init:

/* USER CODE BEGIN TIM6_Init 2 */
  // Clear interrupt bit in SR that was set as a side effect of generating an update event in TIM_Base_SetConfig
  __HAL_TIM_CLEAR_IT(&htim6, TIM_IT_UPDATE);
  // enable timer update interrupt
  __HAL_TIM_ENABLE_IT(&htim6,TIM_IT_UPDATE);
  /* USER CODE END TIM6_Init 2 */

 The timer pulse-width were set with:

htim6.Instance->ARR=20;

I could NOT make the code work, with start of timer by:

HAL_TIM_Base_Start_IT(&htim6);
HAL_TIM_OnePulse_Start_IT(&htim6, TIM_CHANNEL_6);

so I started the timer with:

__HAL_TIM_ENABLE(&htim6);

like described in the video.

The interrupt handler were:

/* USER CODE BEGIN 4 */
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim){
	if(htim==&htim6) // check source
	{
		transmissionReceived=1;
	}
}
/* USER CODE END 4 */

(Like you also suggested 😊 )