STM32F7 ADC + DMA + multiples channels + regular conversion + continuous conversion not sampling

Hi,

I want to sample 9 channels with 1 ADC, using DMA in circular buffer mode with continuous conversion.

My callbacks of conversion (like HAL_ADC_ConvCpltCallback or HAL_ADC_ConvHalfCpltCallback) are not triggering, the sampling seems to never start.

I'm also using freeRTOS.

Am I missing something ?

Here's the code:

#define ADC3_BUF_LEN 9
uint16_t adc3_buf[ADC3_BUF_LEN];
 
/* ADC3 init function */
void MX_ADC3_Init(void)
{
 
 /* USER CODE BEGIN ADC3_Init 0 */
 
 /* USER CODE END ADC3_Init 0 */
 
 ADC_ChannelConfTypeDef sConfig = {0};
 
 /* USER CODE BEGIN ADC3_Init 1 */
 
 /* USER CODE END ADC3_Init 1 */
 /** Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
 */
 hadc3.Instance = ADC3;
 hadc3.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
 hadc3.Init.Resolution = ADC_RESOLUTION_12B;
 hadc3.Init.ScanConvMode = ADC_SCAN_ENABLE;
 hadc3.Init.ContinuousConvMode = DISABLE;
 hadc3.Init.DiscontinuousConvMode = DISABLE;
 hadc3.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
 hadc3.Init.ExternalTrigConv = ADC_SOFTWARE_START;
 hadc3.Init.DataAlign = ADC_DATAALIGN_RIGHT;
 hadc3.Init.NbrOfConversion = 9;
 hadc3.Init.DMAContinuousRequests = ENABLE;
 hadc3.Init.EOCSelection = ADC_EOC_SEQ_CONV;
 if (HAL_ADC_Init(&hadc3) != HAL_OK)
 {
 Error_Handler();
 }
 /** Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
 */
 sConfig.Channel = ADC_CHANNEL_9;
 sConfig.Rank = ADC_REGULAR_RANK_1;
 sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
 if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)
 {
 Error_Handler();
 }
 /** Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
 */
 sConfig.Channel = ADC_CHANNEL_14;
 sConfig.Rank = ADC_REGULAR_RANK_2;
 if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)
 {
 Error_Handler();
 }
 /** Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
 */
 sConfig.Channel = ADC_CHANNEL_15;
 sConfig.Rank = ADC_REGULAR_RANK_3;
 if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)
 {
 Error_Handler();
 }
 /** Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
 */
 sConfig.Channel = ADC_CHANNEL_4;
 sConfig.Rank = ADC_REGULAR_RANK_4;
 if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)
 {
 Error_Handler();
 }
 /** Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
 */
 sConfig.Channel = ADC_CHANNEL_10;
 sConfig.Rank = ADC_REGULAR_RANK_5;
 if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)
 {
 Error_Handler();
 }
 /** Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
 */
 sConfig.Channel = ADC_CHANNEL_11;
 sConfig.Rank = ADC_REGULAR_RANK_6;
 if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)
 {
 Error_Handler();
 }
 /** Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
 */
 sConfig.Channel = ADC_CHANNEL_12;
 sConfig.Rank = ADC_REGULAR_RANK_7;
 if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)
 {
 Error_Handler();
 }
 /** Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
 */
 sConfig.Channel = ADC_CHANNEL_13;
 sConfig.Rank = ADC_REGULAR_RANK_8;
 if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)
 {
 Error_Handler();
 }
 /** Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
 */
 sConfig.Channel = ADC_CHANNEL_3;
 sConfig.Rank = ADC_REGULAR_RANK_9;
 if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)
 {
 Error_Handler();
 }
 /* USER CODE BEGIN ADC3_Init 2 */
 if (HAL_ADC_Start_DMA(&hadc3, (uint32_t*)adc3_buf, ADC3_BUF_LEN) != HAL_OK)
 {
 Error_Handler();
 }
 
 /* USER CODE END ADC3_Init 2 */
 
}

Thank!