File content as of revision 581:39197bcd20f2:

/**
  ******************************************************************************
  * @file    stm32f4xx_hal_sai_ex.c
  * @author  MCD Application Team
  * @version V1.3.0
  * @date    09-March-2015
  * @brief   SAI Extension HAL module driver.
  *          This file provides firmware functions to manage the following 
  *          functionalities of SAI extension peripheral:
  *           + Extension features functions
  *         
  @verbatim
  ==============================================================================
               ##### SAI peripheral extension features  #####
  ==============================================================================
           
  [..] Comparing to other previous devices, the SAI interface for STM32F446xx 
       devices contains the following additional features :
       
       (+) Possibility to be clocked from PLLR
   
                     ##### How to use this driver #####
  ==============================================================================
  [..] This driver provides functions to manage several sources to clock SAI
  
  @endverbatim
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2015 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 "stm32f4xx_hal.h"

/** @addtogroup STM32F4xx_HAL_Driver
  * @{
  */

/** @defgroup SAIEx SAIEx
  * @brief SAI Extension HAL module driver
  * @{
  */

#ifdef HAL_SAI_MODULE_ENABLED

#if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx) || defined(STM32F446xx)

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* SAI registers Masks */
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/** @defgroup SAI_Private_Functions  SAI Private Functions
  * @{
  */
 /**
  * @}
  */
  
/* Exported functions --------------------------------------------------------*/
/** @defgroup SAIEx_Exported_Functions SAI Extended Exported Functions
  * @{
  */

/** @defgroup SAIEx_Exported_Functions_Group1 Extension features functions 
  *  @brief   Extension features functions
  *
@verbatim    
 ===============================================================================
                       ##### Extension features Functions #####
 ===============================================================================  
    [..]
    This subsection provides a set of functions allowing to manage the possible 
    SAI clock sources.

@endverbatim
  * @{
  */

/**
  * @brief  Configure SAI Block synchronization mode
  * @param  hsai: pointer to a SAI_HandleTypeDef structure that contains
  *               the configuration information for SAI module.   
  * @retval SAI Clock Input 
  */
void SAI_BlockSynchroConfig(SAI_HandleTypeDef *hsai)
{
  uint32_t tmpregisterGCR = 0;
  
#if defined(STM32F446xx)  
  /* This setting must be done with both audio block (A & B) disabled     */
  switch(hsai->Init.SynchroExt)
  {
  case SAI_SYNCEXT_DISABLE :
    tmpregisterGCR = 0;
    break;
  case SAI_SYNCEXT_IN_ENABLE :
    tmpregisterGCR = SAI_GCR_SYNCIN_0;
    break;
  case SAI_SYNCEXT_OUTBLOCKA_ENABLE :
    tmpregisterGCR = SAI_GCR_SYNCOUT_0;
    break;
  case SAI_SYNCEXT_OUTBLOCKB_ENABLE :
    tmpregisterGCR = SAI_GCR_SYNCOUT_1;
    break;
  }
  
  if((hsai->Instance == SAI1_Block_A) || (hsai->Instance == SAI1_Block_B))
  {
    SAI1->GCR = tmpregisterGCR;
  }
  else 
  {
    SAI2->GCR = tmpregisterGCR;
  }
#endif /* STM32F446xx */
#if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)
  /* This setting must be done with both audio block (A & B) disabled                   */
  switch(hsai->Init.SynchroExt)
  {
  case SAI_SYNCEXT_DISABLE :
    tmpregisterGCR = 0;
    break;
  case SAI_SYNCEXT_OUTBLOCKA_ENABLE :
    tmpregisterGCR = SAI_GCR_SYNCOUT_0;
    break;
  case SAI_SYNCEXT_OUTBLOCKB_ENABLE :
    tmpregisterGCR = SAI_GCR_SYNCOUT_1;
    break;
  }
  SAI1->GCR = tmpregisterGCR;
#endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx */ 
}
  /**
  * @brief  Get SAI Input Clock based on SAI source clock selection
  * @param  hsai: pointer to a SAI_HandleTypeDef structure that contains
  *               the configuration information for SAI module.   
  * @retval SAI Clock Input 
  */
uint32_t SAI_GetInputClock(SAI_HandleTypeDef *hsai)   
{
  /* This variable used to store the SAI_CK_x (value in Hz) */
  uint32_t saiclocksource = 0;
  
#if defined(STM32F446xx)
  if ((hsai->Instance == SAI1_Block_A) || (hsai->Instance == SAI1_Block_B))
  {
    saiclocksource = HAL_RCCEx_GetPeriphCLKFreq(RCC_PERIPHCLK_SAI1);
  }
  else /* SAI2_Block_A || SAI2_Block_B*/
  {
    saiclocksource = HAL_RCCEx_GetPeriphCLKFreq(RCC_PERIPHCLK_SAI2); 
  }
#endif /* STM32F446xx */
#if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)
  uint32_t vcoinput = 0, tmpreg = 0;
  
  /* Check the SAI Block parameters */
  assert_param(IS_SAI_CLK_SOURCE(hsai->Init.ClockSource));
  
  /* SAI Block clock source selection */
  if(hsai->Instance == SAI1_Block_A)
  {
     __HAL_RCC_SAI_BLOCKACLKSOURCE_CONFIG(hsai->Init.ClockSource);
  }
  else
  {
     __HAL_RCC_SAI_BLOCKBCLKSOURCE_CONFIG((uint32_t)(hsai->Init.ClockSource << 2));
  }
  
  /* VCO Input Clock value calculation */
  if((RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC) == RCC_PLLSOURCE_HSI)
  {
    /* In Case the PLL Source is HSI (Internal Clock) */
    vcoinput = (HSI_VALUE / (uint32_t)(RCC->PLLCFGR & RCC_PLLCFGR_PLLM));
  }
  else
  {
    /* In Case the PLL Source is HSE (External Clock) */
    vcoinput = ((HSE_VALUE / (uint32_t)(RCC->PLLCFGR & RCC_PLLCFGR_PLLM)));
  }

  /* SAI_CLK_x : SAI Block Clock configuration for different clock sources selected */
  if(hsai->Init.ClockSource == SAI_CLKSOURCE_PLLSAI)
  {
    /* Configure the PLLI2S division factor */
    /* PLLSAI_VCO Input  = PLL_SOURCE/PLLM */
    /* PLLSAI_VCO Output = PLLSAI_VCO Input * PLLSAIN */
    /* SAI_CLK(first level) = PLLSAI_VCO Output/PLLSAIQ */
    tmpreg = (RCC->PLLSAICFGR & RCC_PLLSAICFGR_PLLSAIQ) >> 24;
    saiclocksource = (vcoinput * ((RCC->PLLSAICFGR & RCC_PLLSAICFGR_PLLSAIN) >> 6))/(tmpreg);

    /* SAI_CLK_x = SAI_CLK(first level)/PLLSAIDIVQ */
    tmpreg = (((RCC->DCKCFGR & RCC_DCKCFGR_PLLSAIDIVQ) >> 8) + 1);
    saiclocksource = saiclocksource/(tmpreg); 

  }
  else if(hsai->Init.ClockSource == SAI_CLKSOURCE_PLLI2S)
  {        
    /* Configure the PLLI2S division factor */
    /* PLLI2S_VCO Input  = PLL_SOURCE/PLLM */
    /* PLLI2S_VCO Output = PLLI2S_VCO Input * PLLI2SN */
    /* SAI_CLK(first level) = PLLI2S_VCO Output/PLLI2SQ */
    tmpreg = (RCC->PLLI2SCFGR & RCC_PLLI2SCFGR_PLLI2SQ) >> 24;
    saiclocksource = (vcoinput * ((RCC->PLLI2SCFGR & RCC_PLLI2SCFGR_PLLI2SN) >> 6))/(tmpreg);
    
    /* SAI_CLK_x = SAI_CLK(first level)/PLLI2SDIVQ */
    tmpreg = ((RCC->DCKCFGR & RCC_DCKCFGR_PLLI2SDIVQ) + 1); 
    saiclocksource = saiclocksource/(tmpreg);
  }
  else /* sConfig->ClockSource == SAI_CLKSource_Ext */
  {
    /* Enable the External Clock selection */
    __HAL_RCC_I2S_CONFIG(RCC_I2SCLKSOURCE_EXT);
    
    saiclocksource = EXTERNAL_CLOCK_VALUE;
  }
#endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx */
       /* the return result is the value of SAI clock */
  return saiclocksource;        
}

/**
  * @}
  */

/**
  * @}
  */

#endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx  || STM32F446xx */
#endif /* HAL_SAI_MODULE_ENABLED */
/**
  * @}
  */

/**
  * @}
  */

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