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,

[SA V.1]

Hello sir , My Dout is

1*.  We must and should Enable the Bellow interrupt to Collect ADC Data ??

( In H7XX series and CubeIDE )

/* DMA interrupt init */

 /* DMA1_Stream0_IRQn interrupt configuration */

 HAL_NVIC_SetPriority(DMA1_Stream0_IRQn, 0, 0);

 HAL_NVIC_EnableIRQ(DMA1_Stream0_IRQn);

2*. If we Disable the the DMA interrupt is it possible Recieve ADC data or Not ??

Please can you Clear this Dout

Thank You ,

Best Regards

Sharath A V

[SA V.1]

Where is your Callback Function ?? if your not wrote in your code write callback function in User code 4 and Check .

/* USER CODE BEGIN 4 */

void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc)

{

for(int i=0; i<=4; i++)

{

  aADCxConvertedData[i] = HAL_ADC_GetValue(&hadc1);

}

}

[Kamil Duljas]

@SA V.1​ Your code is ok as debug, but when use DMA we consciously avoid calling HAL_ADC_Get_Value. if use HAL_ADC_Start_DMA(&hadc1,(uint32_t*)aADCxConvertedData, 4 ) the function automatically fill aADCxConvertedData.

I have simillar problem far time ago and Enabling "lowPowerAutopWait" helped me

[SA V.1]

Yes, Your right but to simply check weather data is getting or not so that's why i said above function . And what you will write inside the Callback function ?? in my code i wrote

SCB_InvalidateDCache_by_Addr((uint32_t *) &ADC_Data[0], BUFFER_SIZE); can you share what you write ?? everything fine but my big Dout is DMA interrupt still i didnt get any clarity . i tried many without DMA interrupt not get any data .

Thank you for your support

best regards

Sharath A V

[Kamil Duljas]

You don't need callback function to receive data through DMA.

It's OPTIONAL. Please read reference manual deeper

[Tesla DeLorean]

doubt..

The DMA proceeds regardless of the interrupt/callback.

You can check the HT/TC status for the DMA peripheral directly

[LCE]

@Saif​ Did you have any success?

[Saif]

Hi all

I don't know what I'm going to say, but maybe you don't believe me.

I put back the same configuration that I wrote in my question, and the ADC works correctly now despite there being no change.

Apparently, I will spend some time reproducing the problem to understand.

Best Regards,

[LCE]

Nice that it's working now!

Are you sure that you didn't change stuff elsewhere, like:

• clock settings
• DMA interrupts

Oh, I just see the old CubeMX problem, putting DMA init after peripheral init using DMA.

In your 2nd source code post it is:

/* Initialize all configured peripherals */

MX_GPIO_Init();

MX_ADC1_Init();

MX_DMA_Init(); <<<< this must be before any peripheral using DMA!

I guess you changed your main, maybe by updating CubeMX?

Known bug, and it bugs me that I haven't seen that earlier! ;)

[LCE]

@Saif​ really curious if it was the "infamous CubeMX DMA init order bug"... :D