The DMA transfer only the first byte from ADC1 (STM32H735)

[Saif]

I configure the ADC1 of the STM32H735 like bellow:

The ADC Clock = 20MHz

ADC_HandleTypeDef hadc1;
DMA_HandleTypeDef hdma_adc1;
 
/* ADC1 init function */
void MX_ADC1_Init(void)
{
 
  /* USER CODE BEGIN ADC1_Init 0 */
 
  /* USER CODE END ADC1_Init 0 */
 
  ADC_MultiModeTypeDef multimode = {0};
  ADC_ChannelConfTypeDef sConfig = {0};
 
  /* USER CODE BEGIN ADC1_Init 1 */
 
  /* USER CODE END ADC1_Init 1 */
 
  /** Common config
  */
  hadc1.Instance = ADC1;
  hadc1.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV4;
  hadc1.Init.Resolution = ADC_RESOLUTION_12B;
  hadc1.Init.ScanConvMode = DISABLE;
  hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
  hadc1.Init.LowPowerAutoWait = DISABLE;
  hadc1.Init.ContinuousConvMode = ENABLE;
  hadc1.Init.NbrOfConversion = 1;
  hadc1.Init.DiscontinuousConvMode = DISABLE;
  hadc1.Init.NbrOfDiscConversion   = 1;
  hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
  hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
  hadc1.Init.ConversionDataManagement = ADC_CONVERSIONDATA_DMA_CIRCULAR;
  hadc1.Init.DMAContinuousRequests = ENABLE;
  hadc1.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;
  hadc1.Init.OversamplingMode = DISABLE;
  if (HAL_ADC_Init(&hadc1) != HAL_OK)
  {
    Error_Handler();
  }
 
  /** Configure Regular Channel
  */
  sConfig.Channel = ADC_CHANNEL_0;
  sConfig.Rank = ADC_REGULAR_RANK_1;
  sConfig.SamplingTime = ADC_SAMPLETIME_8CYCLES_5;
  sConfig.SingleDiff = ADC_SINGLE_ENDED;
  sConfig.OffsetNumber = ADC_OFFSET_NONE;
  sConfig.Offset = 0;
  sConfig.OffsetSignedSaturation = DISABLE;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN ADC1_Init 2 */
 
  /* USER CODE END ADC1_Init 2 */
 
}

void HAL_ADC_MspInit(ADC_HandleTypeDef* adcHandle)
{
 
  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
  if(adcHandle->Instance==ADC1)
  {
  /* USER CODE BEGIN ADC1_MspInit 0 */
 
  /* USER CODE END ADC1_MspInit 0 */
 
  /** Initializes the peripherals clock
  */
    PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_ADC;
    PeriphClkInitStruct.PLL3.PLL3M = 2;
    PeriphClkInitStruct.PLL3.PLL3N = 40;
    PeriphClkInitStruct.PLL3.PLL3P = 2;
    PeriphClkInitStruct.PLL3.PLL3Q = 5;
    PeriphClkInitStruct.PLL3.PLL3R = 25;
    PeriphClkInitStruct.PLL3.PLL3RGE = RCC_PLL3VCIRANGE_3;
    PeriphClkInitStruct.PLL3.PLL3VCOSEL = RCC_PLL3VCOWIDE;
    PeriphClkInitStruct.PLL3.PLL3FRACN = 0;
    PeriphClkInitStruct.AdcClockSelection = RCC_ADCCLKSOURCE_PLL3;
    if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
    {
      Error_Handler();
    }
 
    /* ADC1 clock enable */
    __HAL_RCC_ADC12_CLK_ENABLE();
 
    __HAL_RCC_GPIOA_CLK_ENABLE();
    /**ADC1 GPIO Configuration
    PA0_C     ------> ADC1_INP0
    */
    HAL_SYSCFG_AnalogSwitchConfig(SYSCFG_SWITCH_PA0, SYSCFG_SWITCH_PA0_OPEN);
 
    /* ADC1 DMA Init */
    /* ADC1 Init */
    hdma_adc1.Instance = DMA1_Stream1;
    hdma_adc1.Init.Request = DMA_REQUEST_ADC1;
    hdma_adc1.Init.Direction = DMA_PERIPH_TO_MEMORY;
    hdma_adc1.Init.PeriphInc = DMA_PINC_DISABLE;
    hdma_adc1.Init.MemInc = DMA_MINC_ENABLE;
    hdma_adc1.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
    hdma_adc1.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
    hdma_adc1.Init.Mode = DMA_CIRCULAR;
    hdma_adc1.Init.Priority = DMA_PRIORITY_MEDIUM;
    hdma_adc1.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
    if (HAL_DMA_Init(&hdma_adc1) != HAL_OK)
    {
      Error_Handler();
    }
 
    __HAL_LINKDMA(adcHandle,DMA_Handle,hdma_adc1);
 
  /* USER CODE BEGIN ADC1_MspInit 1 */
 
  /* USER CODE END ADC1_MspInit 1 */
  }
}

The ADC1_DR register = 0xFFE (I put 3.3V in PA0_C pin) it is ok.

but in the buffer, the dma transfer only the first byte :

I did not understand why the DMA always transfers a Byte despite I made several configuration combinations.

Best Regards,

[LCE]

Please show us the buffer declaration and how you start DMA.

[LCE]

And you could try:

hadc1.Init.EOCSelection = ADC_EOC_SEQ_CONV;

[Saif]

extern ADC_HandleTypeDef hadc1;
ALIGN_32BYTES (static uint16_t   aADCxConvertedData[4]);
/* USER CODE END Includes */
 
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
 
static void CPU_CACHE_Enable(void);
/* USER CODE END PTD */
 
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
 
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
 
/* USER CODE END PM */
 
/* Private variables ---------------------------------------------------------*/
 
/* USER CODE BEGIN PV */
 
/* USER CODE END PV */
 
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
 
/* USER CODE END PFP */
 
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
 
/* USER CODE END 0 */
 
/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{
  /* USER CODE BEGIN 1 */
  /* USER CODE END 1 */
  /* MCU Configuration--------------------------------------------------------*/
 
  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();
 
  /* USER CODE BEGIN Init */
 
  /* USER CODE END Init */
 
  /* Configure the system clock */
  SystemClock_Config();
 
  /* USER CODE BEGIN SysInit */
 
  /* USER CODE END SysInit */
 
  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_ADC1_Init();
  MX_DMA_Init();
  /* USER CODE BEGIN 2 */
  HAL_ADCEx_Calibration_Start(&hadc1, ADC_CALIB_OFFSET, ADC_SINGLE_ENDED);
  HAL_ADC_Start_DMA(&hadc1,(uint32_t*)aADCxConvertedData, 4 );
 
  /* USER CODE END 2 */
 
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */
    /* USER CODE BEGIN 3 */
 
  }
  /* USER CODE END 3 */
}

[Saif]

Same problem

[LCE]

Looks exactly like my working H7 ADC code.

[LCE]

I'm using ADC3 on a H723 / H735.

I don't see any GPIO init, is that included in HAL_SYSCFG_AnalogSwitchConfig() ?

There's this line in my init concerning ADC data alignment in the data register:

hAdc3.Init.DataAlign = ADC3_DATAALIGN_RIGHT;

Here's my working HAL setup, but I use multiple channels.

uint8_t ADC3_InitStartDma(void)
{
	/* Configure the global features of the ADC:
	 * Clock, Resolution, Data Alignment and number of conversion
	 */
	hAdc3.Instance = ADC3;
 
	hAdc3.Init.ClockPrescaler 			= ADC_CLOCK_ASYNC_DIV32;
	hAdc3.Init.Resolution 				= ADC_RESOLUTION_12B;
	hAdc3.Init.DataAlign 				= ADC3_DATAALIGN_RIGHT;
	hAdc3.Init.ScanConvMode 			= ADC_SCAN_ENABLE;
	hAdc3.Init.ContinuousConvMode 		= ENABLE;
	hAdc3.Init.EOCSelection 			= ADC_EOC_SEQ_CONV;
	hAdc3.Init.LowPowerAutoWait 		= DISABLE;
	hAdc3.Init.NbrOfConversion 			= ADC_CHNL_MAX;
	hAdc3.Init.DiscontinuousConvMode 	= DISABLE;
	hAdc3.Init.ExternalTrigConv 		= ADC_SOFTWARE_START;
	hAdc3.Init.ExternalTrigConvEdge 	= ADC_EXTERNALTRIGCONVEDGE_NONE;
	hAdc3.Init.DMAContinuousRequests 	= ENABLE;
	hAdc3.Init.ConversionDataManagement = ADC_CONVERSIONDATA_DMA_CIRCULAR;
	hAdc3.Init.SamplingMode 			= ADC_SAMPLING_MODE_NORMAL;
	hAdc3.Init.Overrun 					= ADC_OVR_DATA_OVERWRITTEN;
	//hAdc3.Init.Overrun 					= ADC_OVR_DATA_PRESERVED;
	hAdc3.Init.LeftBitShift 			= ADC_LEFTBITSHIFT_NONE;
	hAdc3.Init.OversamplingMode 		= DISABLE;
 
	if( HAL_ADC_Init(&hAdc3) != HAL_OK ) Error_Handler_FL(__FILE__, __LINE__);
 
	/* self calibration */
	if( HAL_ADCEx_Calibration_Start(&hAdc3, ADC_CALIB_OFFSET, ADC_SINGLE_ENDED ) != HAL_OK ) Error_Handler_FL(__FILE__, __LINE__);
 
	return HAL_ADC_Start_DMA(&hAdc3, (uint32_t *)u16Adc3DmaBuffer, ADC_DMA_BUF_SIZE);
}

[LCE]

Man, that's ugly source code with my tab settings, sorry... :grinning_face_with_sweat:

[LCE]

@Saif​ Have you enabled the DMA interrupts somewhere?

/* ADC DMA interrupt configuration */

HAL_NVIC_SetPriority(DMA1_Stream1_IRQn, 5, 0);

HAL_NVIC_EnableIRQ(DMA1_Stream1_IRQn);

[Kamil Duljas]

1. Try change hadc1.Init.LowPowerAutoWait = DISABLE to ENABLE