Hello Community,
I am trying to post-process my just sampled ADC values with the DFSDM sinc-Filter and mainly the oversampler.
The problem ist: My DFSDM doesn't output anything. I tried DMA and polling.
Polling generates a timeout.
I configured the ADC with a single channel with continuous conversion mode. Polling the ADC value gets me the correct analog value.
I further configured the DFSDM Channel0 as mode=parallel Input, Multiplexer=Data are taken from ADC1, standard data packing.
Furtheremore Filter 1 is configured for channel 0, continuous mode, software trigger, fastsinc, fosr=iosr=1.
I checked the ChannelState (HAL_DFSDM_CHANNEL_STATE_READY) and FilterState (HAL_DFSDM_FILTER_STATE_REG) of the DFSDM, which is fine I think.
So polling generates a timeout and dfsdm start with DMA generates nothing.
Where is my error?
Thanks in advance.
The following shows the beginning of the main.c code just for informative purposes:
/* Private variables ---------------------------------------------------------*/
ADC_HandleTypeDef hadc1;
DFSDM_Filter_HandleTypeDef hdfsdm1_filter0;
DFSDM_Channel_HandleTypeDef hdfsdm1_channel0;
DMA_HandleTypeDef hdma_dfsdm1_flt0;
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_ADC1_Init(void);
static void MX_DFSDM1_Init(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_DMA_Init();
MX_ADC1_Init();
MX_DFSDM1_Init();
/* USER CODE BEGIN 2 */
uint32_t buf[LEN] = {0};
HAL_ADC_Start(&hadc1);
HAL_StatusTypeDef filterstatus = HAL_DFSDM_FilterRegularStart(&hdfsdm1_filter0);
uint32_t val0 = 0;
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
HAL_DFSDM_Filter_StateTypeDef state = HAL_DFSDM_FilterGetState(&hdfsdm1_filter0);
uint32_t error = HAL_DFSDM_FilterGetError(&hdfsdm1_filter0);
HAL_DFSDM_Channel_StateTypeDef channelstate = HAL_DFSDM_ChannelGetState(&hdfsdm1_channel0);
HAL_StatusTypeDef pollstatus = HAL_DFSDM_FilterPollForRegConversion(&hdfsdm1_filter0, 1000);
//HAL_ADC_PollForConversion(&hadc1, 1000);
uint16_t adval = HAL_ADC_GetValue(&hadc1);
val0 = HAL_DFSDM_FilterGetRegularValue(&hdfsdm1_filter0, 0);
val0 = buf[0];
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
