text: /**
    ******************************************************************************
    * @file    stm32l4xx_hal_sai_ex.c
    * @author  MCD Application Team
    * @brief   SAI Extended HAL module driver.  
    *          This file provides firmware functions to manage the following
    *          functionality of the SAI Peripheral Controller:
    *           + Modify PDM microphone delays.
    *
    ******************************************************************************
    * @attention
    *
    * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
    *
    * Redistribution and use in source and binary forms, with or without modification,
    * are permitted provided that the following conditions are met:
    *   1. Redistributions of source code must retain the above copyright notice,
    *      this list of conditions and the following disclaimer.
    *   2. Redistributions in binary form must reproduce the above copyright notice,
    *      this list of conditions and the following disclaimer in the documentation
    *      and/or other materials provided with the distribution.
    *   3. Neither the name of STMicroelectronics nor the names of its contributors
    *      may be used to endorse or promote products derived from this software
    *      without specific prior written permission.
    *
    * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
    * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
    * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
    * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    *
    ******************************************************************************
    */ 
  
  /* Includes ------------------------------------------------------------------*/
  #include "stm32l4xx_hal.h"
  
  /** @addtogroup STM32L4xx_HAL_Driver
    * @{
    */
  #ifdef HAL_SAI_MODULE_ENABLED
  #if defined(STM32L4R5xx) || defined(STM32L4R7xx) || defined(STM32L4R9xx) || defined(STM32L4S5xx) || defined(STM32L4S7xx) || defined(STM32L4S9xx)
  
  /** @defgroup SAIEx SAIEx
    * @brief SAI Extended HAL module driver
    * @{
    */
  
  /* 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 --------------------------------------------------------*/
  
  /** @defgroup SAIEx_Exported_Functions SAIEx Extended Exported Functions
    * @{
    */
  
  /** @defgroup SAIEx_Exported_Functions_Group1 Peripheral Control functions
    * @brief    SAIEx control functions
   *
  @verbatim
   ===============================================================================
                   ##### Extended features functions #####
   ===============================================================================
      [..]  This section provides functions allowing to:
        (+) Modify PDM microphone delays
  
  @endverbatim
    * @{
    */
  
  /**
    * @brief  Configure PDM microphone delays.
    * @param  hsai SAI handle.
    * @param  pdmMicDelay Microphone delays configuration.
    * @retval HAL status
    */
  HAL_StatusTypeDef HAL_SAIEx_ConfigPdmMicDelay(SAI_HandleTypeDef *hsai, SAIEx_PdmMicDelayParamTypeDef *pdmMicDelay)
  {
    HAL_StatusTypeDef status = HAL_OK;
    
    /* 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));
      
      /* Check SAI state */
      if(hsai->State != HAL_SAI_STATE_RESET)
      {
        /* Reset current delays for specified microphone */
        SAI1->PDMDLY &= ~(SAI_PDM_DELAY_MASK << (SAI_PDM_DELAY_OFFSET * (pdmMicDelay->MicPair - 1)));
        
        /* Apply new microphone delays */
        SAI1->PDMDLY |= (((pdmMicDelay->RightDelay << SAI_PDM_RIGHT_DELAY_OFFSET) | pdmMicDelay->LeftDelay) << \
                          (SAI_PDM_DELAY_OFFSET * (pdmMicDelay->MicPair - 1)));
      }
      else
      {
        status = HAL_ERROR;
      }
    }
    return status;
  }
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  #endif /* STM32L4R5xx || STM32L4R7xx || STM32L4R9xx || STM32L4S5xx || STM32L4S7xx || STM32L4S9xx */
  #endif /* HAL_SAI_MODULE_ENABLED */
  /**
    * @}
    */
  
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  