ADC in conjustion with DMA

Hello @Pejwaak,

Please, make sure in your DMA settings you have correctly enable the incrementing address of "Destination Address".

Feel free to share your settings :)

Kind Regards,

Gwénolé

Hi

Thanks for getting to me. I am not writing the low level code. I am using HAL library and I assumed as long as I follow the working examples. It should do the same thing although this is a different STM32 microcontroller.

Here is the part of the code that runs it. I also use the call back function to sent the ADCFlag.

HAL_ADC_Start_DMA(&hadc, ADCArray, 3);
 HAL_TIM_Base_Start_IT(&htim2);
 /* USER CODE END 2 */

 /* Infinite loop */
 /* USER CODE BEGIN WHILE */
 while (1)
 {
 /* USER CODE END WHILE */

 /* USER CODE BEGIN 3 */
 if(ADCFlag){
 ADCStat = HAL_ADC_GetState(&hadc);
 if(ADCStat == 0){
 ADCFlag = 0;
 HAL_ADC_Start_DMA(&hadc, ADCArray, 3);
 }

Hi

Thanks it is a lo of line. I am going to put the relevant bits here. Hopefully it will work.

static void MX_ADC_Init(void)
{

/* USER CODE BEGIN ADC_Init 0 */

/* USER CODE END ADC_Init 0 */

ADC_ChannelConfTypeDef sConfig = {0};

/* USER CODE BEGIN ADC_Init 1 */

/* USER CODE END ADC_Init 1 */
/** Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
*/
hadc.Instance = ADC1;
hadc.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV4;
hadc.Init.Resolution = ADC_RESOLUTION_10B;
hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc.Init.ScanConvMode = ADC_SCAN_ENABLE;
hadc.Init.EOCSelection = ADC_EOC_SEQ_CONV;
hadc.Init.LowPowerAutoWait = ADC_AUTOWAIT_DISABLE;
hadc.Init.LowPowerAutoPowerOff = ADC_AUTOPOWEROFF_DISABLE;
hadc.Init.ChannelsBank = ADC_CHANNELS_BANK_A;
hadc.Init.ContinuousConvMode = ENABLE;
hadc.Init.NbrOfConversion = 3;
hadc.Init.DiscontinuousConvMode = DISABLE;
hadc.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc.Init.DMAContinuousRequests = ENABLE;
if (HAL_ADC_Init(&hadc) != 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_0;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_16CYCLES;
if (HAL_ADC_ConfigChannel(&hadc, &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_2;
sConfig.Rank = ADC_REGULAR_RANK_2;
if (HAL_ADC_ConfigChannel(&hadc, &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_6;
sConfig.Rank = ADC_REGULAR_RANK_3;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN ADC_Init 2 */

/* USER CODE END ADC_Init 2 */

}

This is the configuration of ADC. The rest of the code is presented above. It is very simple. Start with DMA, set the flag by callback function, reset the flag and restart the ADC with DMA again. 

Ok thanks. I will look at it by tomorrow or after and get back to you with a feedback