Resetting the DFSDM Peripheral not working

[Ma3275]

I tried to reset the DFSDM1 Peripheral for two days using the STM32H7A3ZI and STM32Cube FW_H7 V1.11.1 (If that's important)

I want to Change OversamplingRatio and RightBitShift during the run of my program.

Apparently you do this by calling:

MX_DFSDM1_Init();

if(HAL_DFSDM_ChannelDeInit(&hdfsdm1_channel0) != HAL_OK){
Error_Handler();
}
if(HAL_DFSDM_ChannelDeInit(&hdfsdm1_channel1) != HAL_OK){
Error_Handler();
}
if(HAL_DFSDM_ChannelDeInit(&hdfsdm1_channel3) != HAL_OK){
Error_Handler();
}
if(HAL_DFSDM_FilterDeInit(&hdfsdm1_filter0) != HAL_OK){
Error_Handler();
}
if(HAL_DFSDM_FilterDeInit(&hdfsdm1_filter1) != HAL_OK){
Error_Handler();
}
if(HAL_DFSDM_FilterDeInit(&hdfsdm1_filter3) != HAL_OK){
Error_Handler();
}

__HAL_RCC_DFSDM1_CLK_ENABLE();
__HAL_RCC_DFSDM_FORCE_RESET();
__HAL_RCC_DFSDM_RELEASE_RESET();
__HAL_RCC_DFSDM1_CLK_ENABLE();

MX_DFSDM1_Init();

I tried to experiment with the CLK_ENABLE(); because another Post mentioned a possible Bug in 2021.

Without resetting and Deinit/Reinit my DFSDM with DMA works normally and it writes to the array, i start the DFSDM using this:

HAL_DFSDM_FilterRegularMsbStart_DMA(&hdfsdm1_filter0, getMainStorageCH1(), 40000);
HAL_DFSDM_FilterRegularMsbStart_DMA(&hdfsdm1_filter1, getMainStorageCH2(), 40000);
HAL_DFSDM_FilterRegularMsbStart_DMA(&hdfsdm1_filter3, getMainStorageCH3(), 40000);

the get Function return int16_t* to the Array. I use Oversampling of 512 and RightBitShift of 4

(but it shouldn't matter). No Error occurs when re-initializing, but the DFSDM doesn't write the Array

and doesn't fire ConversionHalf/Full Interrupts. I made Screenshots of the registers:

Channel 0 Without ResettingChannel 0 After ResettingFilter 1 Without ResettingFilter 1 After Resetting

Caption describes what was before and after Reset. I see a difference in some Registers but i dont want to spend days again learning the registers and how they work. Does anyone have a solution or is there another way to change Oversampling Ratio and Right Bit Shift without restarting the controller?

[kormendyg]

Hi, I have the same problem on STM32L476. I tried to reset the DFSDM module in RCC but no success. Once I clear the DFEN bit the module stops working.

[SMarie]

This could be caused by the shared clock being initialized/deinitialized by these functions.
Like mentioned in this post.

You could try to add something like this:

if(DFSDM1_Init != 0) // Make sure to not execute DFSDM1_Init--; if == 0 (=0xFFFF FFFF)
{
  DFSDM1_Init-- ;
}

In your functions HAL_DFSDM_FilterMspDeInit and HAL_DFSDM_ChannelMspDeInit:

void HAL_DFSDM_FilterMspDeInit(DFSDM_Filter_HandleTypeDef* dfsdm_filterHandle)
{
  if(DFSDM1_Init != 0) // Make sure to not execute DFSDM1_Init--; if == 0 (=0xFFFF FFFF)
  {
    DFSDM1_Init-- ;
  }
  if(DFSDM1_Init == 0)
  {
  /* USER CODE BEGIN DFSDM1_MspDeInit 0 */

  /* USER CODE END DFSDM1_MspDeInit 0 */
    /* Peripheral clock disable */
    __HAL_RCC_DFSDM1_CLK_DISABLE();

    /**DFSDM1 GPIO Configuration
    PD6     ------> DFSDM1_DATIN1
    PD3     ------> DFSDM1_CKOUT
    PE4     ------> DFSDM1_DATIN3
    PD7     ------> DFSDM1_DATIN4
    */
    HAL_GPIO_DeInit(GPIOD, GPIO_PIN_6|GPIO_PIN_3|GPIO_PIN_7);

    HAL_GPIO_DeInit(GPIOE, GPIO_PIN_4);

    /* DFSDM1 DMA DeInit */
    HAL_DMA_DeInit(dfsdm_filterHandle->hdmaInj);
    HAL_DMA_DeInit(dfsdm_filterHandle->hdmaReg);

  /* USER CODE BEGIN DFSDM1_MspDeInit 1 */

  /* USER CODE END DFSDM1_MspDeInit 1 */
  }
}

void HAL_DFSDM_ChannelMspDeInit(DFSDM_Channel_HandleTypeDef* dfsdm_channelHandle)
{
  if(DFSDM1_Init != 0) // Same verification here !
  {
    DFSDM1_Init-- ;
  }
  if(DFSDM1_Init == 0)
  {
  /* USER CODE BEGIN DFSDM1_MspDeInit 0 */

  /* USER CODE END DFSDM1_MspDeInit 0 */
    /* Peripheral clock disable */
    __HAL_RCC_DFSDM1_CLK_DISABLE();

    /**DFSDM1 GPIO Configuration
    PD6     ------> DFSDM1_DATIN1
    PD3     ------> DFSDM1_CKOUT
    PE4     ------> DFSDM1_DATIN3
    PD7     ------> DFSDM1_DATIN4
    */
    HAL_GPIO_DeInit(GPIOD, GPIO_PIN_6|GPIO_PIN_3|GPIO_PIN_7);

    HAL_GPIO_DeInit(GPIOE, GPIO_PIN_4);

  /* USER CODE BEGIN DFSDM1_MspDeInit 1 */

  /* USER CODE END DFSDM1_MspDeInit 1 */
  }
}

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This should avoid init/deinit clock conflicts.

Hope that will help.

Sulian