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DFSDM and ADC

Question asked by emanuel.giuseppe on Apr 18, 2018

Does anyone has been able to use DFSDM to filter data from the internal ADC?

I have ADC triggered by a timer in order to acquire data equidistant in time.

It works fine but I need to filter them better than using its oversampling function.

I removed ADC oversampling and I tried to use DFSDM with no results.

This is my initialization code:

 

DFSDM_Filter_HandleTypeDef hdfsdm_filter0;
DFSDM_Channel_HandleTypeDef hdfsdm_channel0;

 

hdfsdm_channel0.Instance = DFSDM_Channel0;
hdfsdm_channel0.Init.OutputClock.Activation = DISABLE;
hdfsdm_channel0.Init.OutputClock.Selection = DFSDM_CHANNEL_OUTPUT_CLOCK_SYSTEM;
hdfsdm_channel0.Init.OutputClock.Divider = 3;
hdfsdm_channel0.Init.Input.Multiplexer = DFSDM_CHANNEL_ADC_OUTPUT;
hdfsdm_channel0.Init.Input.DataPacking = DFSDM_CHANNEL_STANDARD_MODE;
hdfsdm_channel0.Init.Input.Pins = DFSDM_CHANNEL_SAME_CHANNEL_PINS;
hdfsdm_channel0.Init.SerialInterface.Type = DFSDM_CHANNEL_SPI_RISING;
hdfsdm_channel0.Init.SerialInterface.SpiClock = DFSDM_CHANNEL_SPI_CLOCK_INTERNAL;
hdfsdm_channel0.Init.Awd.FilterOrder = DFSDM_CHANNEL_SINC3_ORDER;
hdfsdm_channel0.Init.Awd.Oversampling = 128;
hdfsdm_channel0.Init.Offset = 0;
hdfsdm_channel0.Init.RightBitShift = 0x00;
HAL_DFSDM_ChannelInit(&hdfsdm_channel0);

hdfsdm_filter0.Instance = DFSDM_Filter0;
hdfsdm_filter0.Init.RegularParam.Trigger = DFSDM_FILTER_SW_TRIGGER;
hdfsdm_filter0.Init.RegularParam.FastMode = DISABLE;
hdfsdm_filter0.Init.RegularParam.DmaMode = DISABLE;
hdfsdm_filter0.Init.FilterParam.SincOrder = DFSDM_FILTER_SINC3_ORDER;
hdfsdm_filter0.Init.FilterParam.Oversampling = 200;
hdfsdm_filter0.Init.FilterParam.IntOversampling = 8;
HAL_DFSDM_FilterInit(&hdfsdm_filter0);

HAL_DFSDM_FilterConfigRegChannel(&hdfsdm_filter0, DFSDM_CHANNEL_0, DFSDM_CONTINUOUS_CONV_ON);

 

I start conversion with: (obviously ADC and timer are started already)

HAL_DFSDM_FilterRegularStart_IT(&hdfsdm_filter0);

 

But no interrupt comes from DFSDM....

Any one has some experience on it?

 

Thanks in advance

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