stm32l4xx_hal_sai_ex.c

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/* Includes ------------------------------------------------------------------*/
#include "stm32l4xx_hal.h"

#ifdef HAL_SAI_MODULE_ENABLED
#if defined(STM32L4R5xx) || defined(STM32L4R7xx) || defined(STM32L4R9xx) || defined(STM32L4S5xx) || defined(STM32L4S7xx) || defined(STM32L4S9xx)

/* Private types -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private constants ---------------------------------------------------------*/
#define SAI_PDM_DELAY_MASK          0x77U
#define SAI_PDM_DELAY_OFFSET        8U
#define SAI_PDM_RIGHT_DELAY_OFFSET  4U

/* Private macros ------------------------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/* Exported functions --------------------------------------------------------*/
HAL_StatusTypeDef HAL_SAIEx_ConfigPdmMicDelay(SAI_HandleTypeDef *hsai, SAIEx_PdmMicDelayParamTypeDef *pdmMicDelay)
{
  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;
}

#endif /* STM32L4R5xx || STM32L4R7xx || STM32L4R9xx || STM32L4S5xx || STM32L4S7xx || STM32L4S9xx */
#endif /* HAL_SAI_MODULE_ENABLED */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/