Hi all,
I have two pins where I want to read in the voltage with ADC: PA5 and PA7.
Reading in each at its own with polling works fine.
Now I want to read them in both and continously. I understand that the right way to
go is DMA, contonious mode and scan mode.
I have set up a DMA Request:
circular; halfword/halfword; increment at memory
ADC Setup:
static void MX_ADC1_Init(void)
{
/* USER CODE BEGIN ADC1_Init 0 */
/* USER CODE END ADC1_Init 0 */
ADC_ChannelConfTypeDef sConfig = {0};
/* USER CODE BEGIN ADC1_Init 1 */
/* USER CODE END ADC1_Init 1 */
/** Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
*/
hadc1.Instance = ADC1;
hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
hadc1.Init.Resolution = ADC_RESOLUTION_12B;
hadc1.Init.ScanConvMode = ENABLE;
hadc1.Init.ContinuousConvMode = ENABLE;
hadc1.Init.DiscontinuousConvMode = DISABLE;
hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc1.Init.NbrOfConversion = 2;
hadc1.Init.DMAContinuousRequests = DISABLE;
hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
if (HAL_ADC_Init(&hadc1) != 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_5;
sConfig.Rank = 1;
sConfig.SamplingTime = ADC_SAMPLETIME_15CYCLES;
if (HAL_ADC_ConfigChannel(&hadc1, &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_7;
sConfig.Rank = 2;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN ADC1_Init 2 */
/* USER CODE END ADC1_Init 2 */
}
Calling the function like that
// variable global
/* USER CODE BEGIN PV */
uint16_t adc_val[2];
/* USER CODE END PV */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_ADC1_Init();
MX_DMA_Init();
/* USER CODE BEGIN 2 */
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
HAL_Delay(1000);
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
Callback implemented
/* USER CODE BEGIN 4 */
HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc){
__NOP();
}
/* USER CODE END 4 */
Now the problem:
- Callback gets only called once
- Only one value is written to the DMA destination
Debug values are attached as screenshot.
Things I tried:
- Reordering init-functions (apperantly there is a bug, but this changed nothing)
- bigger buffers in DMA
- Setting ADC ECO Flag to "end of all conversion"
- DMA continuous requests to true
Nothing helped. I am kind of stuck. Any help appreciated.
