ADC DMA START STOP problem in stm32h7

[RShar.9]

Hello

i am using UART string command in switch to start stop adc DMA. Start, Stop command work fine only once but after stop command when i give start command ADC DMA does not start again.Belo both function ADC init(CUBEMX created) and ADC_StartStop(Own created)

static 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 */

 /** Common config 

 */

 hadc3.Instance = ADC3;

 hadc3.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV6;

 hadc3.Init.Resolution = ADC_RESOLUTION_16B;

 hadc3.Init.ScanConvMode = ADC_SCAN_ENABLE;

 hadc3.Init.EOCSelection = ADC_EOC_SEQ_CONV;

 hadc3.Init.LowPowerAutoWait = DISABLE;

 hadc3.Init.ContinuousConvMode = ENABLE;

 hadc3.Init.NbrOfConversion = 6;

 hadc3.Init.DiscontinuousConvMode = DISABLE;

 hadc3.Init.ExternalTrigConv = ADC_SOFTWARE_START;

 hadc3.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;

 hadc3.Init.ConversionDataManagement = ADC_CONVERSIONDATA_DMA_CIRCULAR;

 hadc3.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;

 hadc3.Init.LeftBitShift = ADC_LEFTBITSHIFT_NONE;

 hadc3.Init.OversamplingMode = ENABLE;

 hadc3.Init.Oversampling.Ratio = 16;

 hadc3.Init.Oversampling.RightBitShift = ADC_RIGHTBITSHIFT_4;

 hadc3.Init.Oversampling.TriggeredMode = ADC_TRIGGEREDMODE_SINGLE_TRIGGER;

 hadc3.Init.Oversampling.OversamplingStopReset = ADC_REGOVERSAMPLING_CONTINUED_MODE;

 if (HAL_ADC_Init(&hadc3) != HAL_OK)

 {

  Error_Handler();

 }

 /** Configure Regular Channel 

 */

 sConfig.Channel = ADC_CHANNEL_3;

 sConfig.Rank = ADC_REGULAR_RANK_1;

 sConfig.SamplingTime = ADC_SAMPLETIME_32CYCLES_5;

 sConfig.SingleDiff = ADC_SINGLE_ENDED;

 sConfig.OffsetNumber = ADC_OFFSET_NONE;

 sConfig.Offset = 0;

 if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)

 {

  Error_Handler();

 }

 /** Configure Regular Channel 

 */

 sConfig.Channel = ADC_CHANNEL_4;

 sConfig.Rank = ADC_REGULAR_RANK_2;

 if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)

 {

  Error_Handler();

 }

 /** Configure Regular Channel 

 */

 sConfig.Channel = ADC_CHANNEL_5;

 sConfig.Rank = ADC_REGULAR_RANK_3;

 if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)

 {

  Error_Handler();

 }

 /** Configure Regular Channel 

 */

 sConfig.Channel = ADC_CHANNEL_7;

 sConfig.Rank = ADC_REGULAR_RANK_4;

 if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)

 {

  Error_Handler();

 }

 /** Configure Regular Channel 

 */

 sConfig.Channel = ADC_CHANNEL_9;

 sConfig.Rank = ADC_REGULAR_RANK_5;

 if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)

 {

  Error_Handler();

 }

 /** Configure Regular Channel 

 */

 sConfig.Channel = ADC_CHANNEL_VREFINT;

 sConfig.Rank = ADC_REGULAR_RANK_6;

 if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK)

 {

  Error_Handler();

 }

 /* USER CODE BEGIN ADC3_Init 2 */

 /* USER CODE END ADC3_Init 2 */

}

void ADC_StartStop(uint8_t Local){

switch(Local)

{

case START:

HAL_ADC_Start_DMA(&hadc1,(uint32_t *)Avrg_ADC1_data,sizeof(Avrg_ADC1_data)/sizeof(uint32_t));

HAL_ADC_Start_DMA(&hadc2,(uint32_t *)Avrg_ADC2_data,sizeof(Avrg_ADC2_data)/sizeof(uint32_t));

HAL_ADC_Start_DMA(&hadc3,(uint32_t *)Avrg_ADC3_data,sizeof(Avrg_ADC3_data)/sizeof(uint32_t));

break;

case STOP:

HAL_ADC_Stop_DMA(&hadc1);

HAL_ADC_Stop_DMA(&hadc2);

HAL_ADC_Stop_DMA(&hadc3);

break;

default:

break;

}

ADC_StartStop_Flag = Default;

}

please help what is the problem