Peripheral Control functions

SAIEx control functions. More...

Functions
HAL_StatusTypeDef	HAL_SAIEx_ConfigPdmMicDelay (SAI_HandleTypeDef *hsai, SAIEx_PdmMicDelayParamTypeDef *pdmMicDelay)
	Configure PDM microphone delays. More...

Detailed Description

SAIEx control functions.

 ===============================================================================
                 ##### Extended features functions #####
 ===============================================================================
    [..]  This section provides functions allowing to:
      (+) Modify PDM microphone delays

Function Documentation

HAL_SAIEx_ConfigPdmMicDelay()

HAL_StatusTypeDef HAL_SAIEx_ConfigPdmMicDelay	(	SAI_HandleTypeDef *	hsai,
		SAIEx_PdmMicDelayParamTypeDef *	pdmMicDelay
	)

Configure PDM microphone delays.

Parameters

hsai	SAI handle.
pdmMicDelay	Microphone delays configuration.

Return values

HAL

status

Definition at line 78 of file stm32l4xx_hal_sai_ex.c.

{
  HAL_StatusTypeDef status = HAL_OK;
  uint32_t offset;

  /* Check that SAI sub-block is SAI1 sub-block A */
  if (hsai->Instance != SAI1_Block_A)
  {
    status = HAL_ERROR;
  }
  else
  {
    /* Check microphone delay parameters */
    assert_param(IS_SAI_PDM_MIC_PAIRS_NUMBER(pdmMicDelay->MicPair));
    assert_param(IS_SAI_PDM_MIC_DELAY(pdmMicDelay->LeftDelay));
    assert_param(IS_SAI_PDM_MIC_DELAY(pdmMicDelay->RightDelay));

    /* Compute offset on PDMDLY register according mic pair number */
    offset = SAI_PDM_DELAY_OFFSET * (pdmMicDelay->MicPair - 1U);

    /* Check SAI state and offset */
    if ((hsai->State != HAL_SAI_STATE_RESET) && (offset <= 24U))
    {
      /* Reset current delays for specified microphone */
      SAI1->PDMDLY &= ~(SAI_PDM_DELAY_MASK << offset);

      /* Apply new microphone delays */
      SAI1->PDMDLY |= (((pdmMicDelay->RightDelay << SAI_PDM_RIGHT_DELAY_OFFSET) | pdmMicDelay->LeftDelay) << offset);
    }
    else
    {
      status = HAL_ERROR;
    }
  }
  return status;
}