STM32F7 ADC with DMA and watchdog

[JVALL.1]

I've been trying to use the ADC of an STM32F7 so that when the level exceeds a certain threshold it start to sample the input continuously. Here is the configuration.

 

Then I have implemented the code as follows

volatile ITStatus adc1OutOfWindow = RESET;
 
void HAL_ADC_LevelOutOfWindowCallback(ADC_HandleTypeDef *hadc)
{
	HAL_GPIO_WritePin(LED_BOARD_GREEN_GPIO_Port, LED_BOARD_GREEN_Pin, GPIO_PIN_SET);
 
	if (hadc == &hadc1)
	{
		if (adc1OutOfWindow == RESET)
		{
			adc1OutOfWindow = SET;
			HAL_ADC_Start_DMA(&hadc1, (uint32_t*) adc1DoubleBuffer, ADC_DOUBLE_BUFFER_SIZE);
		}
	}
}
 
// Called when first half of buffer is filled
void HAL_ADC_ConvHalfCpltCallback(ADC_HandleTypeDef *hadc)
{
	if (hadc == &hadc1)
	{
		osMessageQueuePut(mqAdc1Dma, &adcFirstHalfMsg, 0U, 0U);
	}
}
 
// Called when buffer is completely filled
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc)
{
	if (hadc == &hadc1)
	{
		osMessageQueuePut(mqAdc1Dma, &adcSecondHalfMsg, 0U, 0U);
	}
}

Then the DAM is handle in an RTOS task

void taskADC1(void *args)
{
       HAL_ADC_Start_IT(_hadc1);
 
	while (1)
	{
		if (osMessageQueueGet(mqAdc1Dma, &adcDmaMsg, 0U, 1000) == osOK)
		{
			/* Som computation */
 
			if (adcMeanValue < 1500)
			{
				adc1OutOfWindow = RESET;
				HAL_ADC_Stop_DMA(_hadc1);
				HAL_GPIO_WritePin(LED_BOARD_RED_GPIO_Port, LED_BOARD_RED_Pin, GPIO_PIN_RESET);
			}
 
		}
		else
		{
			HAL_GPIO_TogglePin(LED_BOARD_GREEN_GPIO_Port, LED_BOARD_GREEN_Pin);
		}
	}
}

But the LevelOutOfWindow callback doesn't seem to trigger,

Is there a way use both DMA and the watchdog feature?

[FBL]

Hello @JVALL.1​,

At the end of data transfer, in conversion complete callback, you should prevent continuous overwriting by using HAL_ADC_Stop_DMA()

You should wait until DMA stops.

You can check this post for a similar application