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/**

  ******************************************************************************

  * @file    stm32f1xx_ll_spi.c

  * @author  MCD Application Team

  * @brief   SPI LL module driver.

  ******************************************************************************

  * @attention

  *

  * <h2><center>&copy; COPYRIGHT(c) 2016 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.

  *

  ******************************************************************************

  */

#if defined(USE_FULL_LL_DRIVER)

/* Includes ------------------------------------------------------------------*/

#include "stm32f1xx_ll_spi.h"

#include "stm32f1xx_ll_bus.h"

#include "stm32f1xx_ll_rcc.h"

#ifdef  USE_FULL_ASSERT

#include "stm32_assert.h"

#else

#define assert_param(expr) ((void)0U)

#endif

/** @addtogroup STM32F1xx_LL_Driver

  * @{

  */

#if defined (SPI1) || defined (SPI2) || defined (SPI3)

/** @addtogroup SPI_LL

  * @{

  */

/* Private types -------------------------------------------------------------*/

/* Private variables ---------------------------------------------------------*/

/* Private constants ---------------------------------------------------------*/

/** @defgroup SPI_LL_Private_Constants SPI Private Constants

  * @{

  */

/* SPI registers Masks */

#define SPI_CR1_CLEAR_MASK                 (SPI_CR1_CPHA    | SPI_CR1_CPOL     | SPI_CR1_MSTR   | \

                                            SPI_CR1_BR      | SPI_CR1_LSBFIRST | SPI_CR1_SSI    | \

                                            SPI_CR1_SSM     | SPI_CR1_RXONLY   | SPI_CR1_DFF    | \

                                            SPI_CR1_CRCNEXT | SPI_CR1_CRCEN    | SPI_CR1_BIDIOE | \

                                            SPI_CR1_BIDIMODE)

/**

  * @}

  */

/* Private macros ------------------------------------------------------------*/

/** @defgroup SPI_LL_Private_Macros SPI Private Macros

  * @{

  */

#define IS_LL_SPI_TRANSFER_DIRECTION(__VALUE__) (((__VALUE__) == LL_SPI_FULL_DUPLEX)    \

                                              || ((__VALUE__) == LL_SPI_SIMPLEX_RX)     \

                                              || ((__VALUE__) == LL_SPI_HALF_DUPLEX_RX) \

                                              || ((__VALUE__) == LL_SPI_HALF_DUPLEX_TX))

#define IS_LL_SPI_MODE(__VALUE__) (((__VALUE__) == LL_SPI_MODE_MASTER) \

                                || ((__VALUE__) == LL_SPI_MODE_SLAVE))

#define IS_LL_SPI_DATAWIDTH(__VALUE__) (((__VALUE__) == LL_SPI_DATAWIDTH_8BIT)  \

                                     || ((__VALUE__) == LL_SPI_DATAWIDTH_16BIT))

#define IS_LL_SPI_POLARITY(__VALUE__) (((__VALUE__) == LL_SPI_POLARITY_LOW) \

                                    || ((__VALUE__) == LL_SPI_POLARITY_HIGH))

#define IS_LL_SPI_PHASE(__VALUE__) (((__VALUE__) == LL_SPI_PHASE_1EDGE) \

                                 || ((__VALUE__) == LL_SPI_PHASE_2EDGE))

#define IS_LL_SPI_NSS(__VALUE__) (((__VALUE__) == LL_SPI_NSS_SOFT) \

                               || ((__VALUE__) == LL_SPI_NSS_HARD_INPUT) \

                               || ((__VALUE__) == LL_SPI_NSS_HARD_OUTPUT))

#define IS_LL_SPI_BAUDRATE(__VALUE__) (((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV2)   \

                                    || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV4)   \

                                    || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV8)   \

                                    || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV16)  \

                                    || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV32)  \

                                    || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV64)  \

                                    || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV128) \

                                    || ((__VALUE__) == LL_SPI_BAUDRATEPRESCALER_DIV256))

#define IS_LL_SPI_BITORDER(__VALUE__) (((__VALUE__) == LL_SPI_LSB_FIRST) \

                                    || ((__VALUE__) == LL_SPI_MSB_FIRST))

#define IS_LL_SPI_CRCCALCULATION(__VALUE__) (((__VALUE__) == LL_SPI_CRCCALCULATION_ENABLE) \

                                          || ((__VALUE__) == LL_SPI_CRCCALCULATION_DISABLE))

#define IS_LL_SPI_CRC_POLYNOMIAL(__VALUE__) ((__VALUE__) >= 0x1U)

/**

  * @}

  */

/* Private function prototypes -----------------------------------------------*/

/* Exported functions --------------------------------------------------------*/

/** @addtogroup SPI_LL_Exported_Functions

  * @{

  */

/** @addtogroup SPI_LL_EF_Init

  * @{

  */

/**

  * @brief  De-initialize the SPI registers to their default reset values.

  * @param  SPIx SPI Instance

  * @retval An ErrorStatus enumeration value:

  *          - SUCCESS: SPI registers are de-initialized

  *          - ERROR: SPI registers are not de-initialized

  */

ErrorStatus LL_SPI_DeInit(SPI_TypeDef *SPIx)

{

  ErrorStatus status = ERROR;

  /* Check the parameters */

  assert_param(IS_SPI_ALL_INSTANCE(SPIx));

#if defined(SPI1)

  if (SPIx == SPI1)

  {

    /* Force reset of SPI clock */

    LL_APB2_GRP1_ForceReset(LL_APB2_GRP1_PERIPH_SPI1);

    /* Release reset of SPI clock */

    LL_APB2_GRP1_ReleaseReset(LL_APB2_GRP1_PERIPH_SPI1);

    status = SUCCESS;

  }

#endif /* SPI1 */

#if defined(SPI2)

  if (SPIx == SPI2)

  {

    /* Force reset of SPI clock */

    LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_SPI2);

    /* Release reset of SPI clock */

    LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_SPI2);

    status = SUCCESS;

  }

#endif /* SPI2 */

#if defined(SPI3)

  if (SPIx == SPI3)

  {

    /* Force reset of SPI clock */

    LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_SPI3);

    /* Release reset of SPI clock */

    LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_SPI3);

    status = SUCCESS;

  }

#endif /* SPI3 */

  return status;

}

/**

  * @brief  Initialize the SPI registers according to the specified parameters in SPI_InitStruct.

  * @note   As some bits in SPI configuration registers can only be written when the SPI is disabled (SPI_CR1_SPE bit =0),

  *         SPI IP should be in disabled state prior calling this function. Otherwise, ERROR result will be returned.

  * @param  SPIx SPI Instance

  * @param  SPI_InitStruct pointer to a @ref LL_SPI_InitTypeDef structure

  * @retval An ErrorStatus enumeration value. (Return always SUCCESS)

  */

ErrorStatus LL_SPI_Init(SPI_TypeDef *SPIx, LL_SPI_InitTypeDef *SPI_InitStruct)

{

  ErrorStatus status = ERROR;

  /* Check the SPI Instance SPIx*/

  assert_param(IS_SPI_ALL_INSTANCE(SPIx));

  /* Check the SPI parameters from SPI_InitStruct*/

  assert_param(IS_LL_SPI_TRANSFER_DIRECTION(SPI_InitStruct->TransferDirection));

  assert_param(IS_LL_SPI_MODE(SPI_InitStruct->Mode));

  assert_param(IS_LL_SPI_DATAWIDTH(SPI_InitStruct->DataWidth));

  assert_param(IS_LL_SPI_POLARITY(SPI_InitStruct->ClockPolarity));

  assert_param(IS_LL_SPI_PHASE(SPI_InitStruct->ClockPhase));

  assert_param(IS_LL_SPI_NSS(SPI_InitStruct->NSS));

  assert_param(IS_LL_SPI_BAUDRATE(SPI_InitStruct->BaudRate));

  assert_param(IS_LL_SPI_BITORDER(SPI_InitStruct->BitOrder));

  assert_param(IS_LL_SPI_CRCCALCULATION(SPI_InitStruct->CRCCalculation));

  if (LL_SPI_IsEnabled(SPIx) == 0x00000000U)

  {

    /*---------------------------- SPIx CR1 Configuration ------------------------

     * Configure SPIx CR1 with parameters:

     * - TransferDirection:  SPI_CR1_BIDIMODE, SPI_CR1_BIDIOE and SPI_CR1_RXONLY bits

     * - Master/Slave Mode:  SPI_CR1_MSTR bit

     * - DataWidth:          SPI_CR1_DFF bit

     * - ClockPolarity:      SPI_CR1_CPOL bit

     * - ClockPhase:         SPI_CR1_CPHA bit

     * - NSS management:     SPI_CR1_SSM bit

     * - BaudRate prescaler: SPI_CR1_BR[2:0] bits

     * - BitOrder:           SPI_CR1_LSBFIRST bit

     * - CRCCalculation:     SPI_CR1_CRCEN bit

     */

    MODIFY_REG(SPIx->CR1,

               SPI_CR1_CLEAR_MASK,

               SPI_InitStruct->TransferDirection | SPI_InitStruct->Mode | SPI_InitStruct->DataWidth |

               SPI_InitStruct->ClockPolarity | SPI_InitStruct->ClockPhase |

               SPI_InitStruct->NSS | SPI_InitStruct->BaudRate |

               SPI_InitStruct->BitOrder | SPI_InitStruct->CRCCalculation);

    /*---------------------------- SPIx CR2 Configuration ------------------------

     * Configure SPIx CR2 with parameters:

     * - NSS management:     SSOE bit

     */

    MODIFY_REG(SPIx->CR2, SPI_CR2_SSOE, (SPI_InitStruct->NSS >> 16U));

    /*---------------------------- SPIx CRCPR Configuration ----------------------

     * Configure SPIx CRCPR with parameters:

     * - CRCPoly:            CRCPOLY[15:0] bits

     */

    if (SPI_InitStruct->CRCCalculation == LL_SPI_CRCCALCULATION_ENABLE)

    {

      assert_param(IS_LL_SPI_CRC_POLYNOMIAL(SPI_InitStruct->CRCPoly));

      LL_SPI_SetCRCPolynomial(SPIx, SPI_InitStruct->CRCPoly);

    }

    status = SUCCESS;

  }

#if defined (SPI_I2S_SUPPORT)

  /* Activate the SPI mode (Reset I2SMOD bit in I2SCFGR register) */

  CLEAR_BIT(SPIx->I2SCFGR, SPI_I2SCFGR_I2SMOD);

#endif /* SPI_I2S_SUPPORT */

  return status;

}

/**

  * @brief  Set each @ref LL_SPI_InitTypeDef field to default value.

  * @param  SPI_InitStruct pointer to a @ref LL_SPI_InitTypeDef structure

  * whose fields will be set to default values.

  * @retval None

  */

void LL_SPI_StructInit(LL_SPI_InitTypeDef *SPI_InitStruct)

{

  /* Set SPI_InitStruct fields to default values */

  SPI_InitStruct->TransferDirection = LL_SPI_FULL_DUPLEX;

  SPI_InitStruct->Mode              = LL_SPI_MODE_SLAVE;

  SPI_InitStruct->DataWidth         = LL_SPI_DATAWIDTH_8BIT;

  SPI_InitStruct->ClockPolarity     = LL_SPI_POLARITY_LOW;

  SPI_InitStruct->ClockPhase        = LL_SPI_PHASE_1EDGE;

  SPI_InitStruct->NSS               = LL_SPI_NSS_HARD_INPUT;

  SPI_InitStruct->BaudRate          = LL_SPI_BAUDRATEPRESCALER_DIV2;

  SPI_InitStruct->BitOrder          = LL_SPI_MSB_FIRST;

  SPI_InitStruct->CRCCalculation    = LL_SPI_CRCCALCULATION_DISABLE;

  SPI_InitStruct->CRCPoly           = 7U;

}

/**

  * @}

  */

/**

  * @}

  */

/**

  * @}

  */

#if defined(SPI_I2S_SUPPORT)

/** @addtogroup I2S_LL

  * @{

  */

/* Private types -------------------------------------------------------------*/

/* Private variables ---------------------------------------------------------*/

/* Private constants ---------------------------------------------------------*/

/** @defgroup I2S_LL_Private_Constants I2S Private Constants

  * @{

  */

/* I2S registers Masks */

#define I2S_I2SCFGR_CLEAR_MASK             (SPI_I2SCFGR_CHLEN   | SPI_I2SCFGR_DATLEN | \

                                            SPI_I2SCFGR_CKPOL   | SPI_I2SCFGR_I2SSTD | \

                                            SPI_I2SCFGR_I2SCFG  | SPI_I2SCFGR_I2SMOD )

#define I2S_I2SPR_CLEAR_MASK               0x0002U

/**

  * @}

  */

/* Private macros ------------------------------------------------------------*/

/** @defgroup I2S_LL_Private_Macros I2S Private Macros

  * @{

  */

#define IS_LL_I2S_DATAFORMAT(__VALUE__)  (((__VALUE__) == LL_I2S_DATAFORMAT_16B)          \

                                       || ((__VALUE__) == LL_I2S_DATAFORMAT_16B_EXTENDED) \

                                       || ((__VALUE__) == LL_I2S_DATAFORMAT_24B)          \

                                       || ((__VALUE__) == LL_I2S_DATAFORMAT_32B))

#define IS_LL_I2S_CPOL(__VALUE__)        (((__VALUE__) == LL_I2S_POLARITY_LOW)  \

                                       || ((__VALUE__) == LL_I2S_POLARITY_HIGH))

#define IS_LL_I2S_STANDARD(__VALUE__)    (((__VALUE__) == LL_I2S_STANDARD_PHILIPS)   \

                                       || ((__VALUE__) == LL_I2S_STANDARD_MSB)       \

                                       || ((__VALUE__) == LL_I2S_STANDARD_LSB)       \

                                       || ((__VALUE__) == LL_I2S_STANDARD_PCM_SHORT) \

                                       || ((__VALUE__) == LL_I2S_STANDARD_PCM_LONG))

#define IS_LL_I2S_MODE(__VALUE__)        (((__VALUE__) == LL_I2S_MODE_SLAVE_TX)  \

                                       || ((__VALUE__) == LL_I2S_MODE_SLAVE_RX)  \

                                       || ((__VALUE__) == LL_I2S_MODE_MASTER_TX) \

                                       || ((__VALUE__) == LL_I2S_MODE_MASTER_RX))

#define IS_LL_I2S_MCLK_OUTPUT(__VALUE__) (((__VALUE__) == LL_I2S_MCLK_OUTPUT_ENABLE) \

                                       || ((__VALUE__) == LL_I2S_MCLK_OUTPUT_DISABLE))

#define IS_LL_I2S_AUDIO_FREQ(__VALUE__) ((((__VALUE__) >= LL_I2S_AUDIOFREQ_8K)    \

                                       && ((__VALUE__) <= LL_I2S_AUDIOFREQ_192K)) \

                                       || ((__VALUE__) == LL_I2S_AUDIOFREQ_DEFAULT))

#define IS_LL_I2S_PRESCALER_LINEAR(__VALUE__)  ((__VALUE__) >= 0x2U)

#define IS_LL_I2S_PRESCALER_PARITY(__VALUE__) (((__VALUE__) == LL_I2S_PRESCALER_PARITY_EVEN) \

                                           || ((__VALUE__) == LL_I2S_PRESCALER_PARITY_ODD))

/**

  * @}

  */

/* Private function prototypes -----------------------------------------------*/

/* Exported functions --------------------------------------------------------*/

/** @addtogroup I2S_LL_Exported_Functions

  * @{

  */

/** @addtogroup I2S_LL_EF_Init

  * @{

  */

/**

  * @brief  De-initialize the SPI/I2S registers to their default reset values.

  * @param  SPIx SPI Instance

  * @retval An ErrorStatus enumeration value:

  *          - SUCCESS: SPI registers are de-initialized

  *          - ERROR: SPI registers are not de-initialized

  */

ErrorStatus LL_I2S_DeInit(SPI_TypeDef *SPIx)

{

  return LL_SPI_DeInit(SPIx);

}

/**

  * @brief  Initializes the SPI/I2S registers according to the specified parameters in I2S_InitStruct.

  * @note   As some bits in SPI configuration registers can only be written when the SPI is disabled (SPI_CR1_SPE bit =0),

  *         SPI IP should be in disabled state prior calling this function. Otherwise, ERROR result will be returned.

  * @param  SPIx SPI Instance

  * @param  I2S_InitStruct pointer to a @ref LL_I2S_InitTypeDef structure

  * @retval An ErrorStatus enumeration value:

  *          - SUCCESS: SPI registers are Initialized

  *          - ERROR: SPI registers are not Initialized

  */

ErrorStatus LL_I2S_Init(SPI_TypeDef *SPIx, LL_I2S_InitTypeDef *I2S_InitStruct)

{

  uint16_t i2sdiv = 2U, i2sodd = 0U, packetlength = 1U;

  uint32_t tmp = 0U;

  uint32_t sourceclock = 0U;

#if defined(I2S2_I2S3_CLOCK_FEATURE)

#else

  LL_RCC_ClocksTypeDef rcc_clocks;

#endif /* I2S2_I2S3_CLOCK_FEATURE */

  ErrorStatus status = ERROR;

  /* Check the I2S parameters */

  assert_param(IS_I2S_ALL_INSTANCE(SPIx));

  assert_param(IS_LL_I2S_MODE(I2S_InitStruct->Mode));

  assert_param(IS_LL_I2S_STANDARD(I2S_InitStruct->Standard));

  assert_param(IS_LL_I2S_DATAFORMAT(I2S_InitStruct->DataFormat));

  assert_param(IS_LL_I2S_MCLK_OUTPUT(I2S_InitStruct->MCLKOutput));

  assert_param(IS_LL_I2S_AUDIO_FREQ(I2S_InitStruct->AudioFreq));

  assert_param(IS_LL_I2S_CPOL(I2S_InitStruct->ClockPolarity));

  if (LL_I2S_IsEnabled(SPIx) == 0x00000000U)

  {

    /*---------------------------- SPIx I2SCFGR Configuration --------------------

     * Configure SPIx I2SCFGR with parameters:

     * - Mode:          SPI_I2SCFGR_I2SCFG[1:0] bit

     * - Standard:      SPI_I2SCFGR_I2SSTD[1:0] and SPI_I2SCFGR_PCMSYNC bits

     * - DataFormat:    SPI_I2SCFGR_CHLEN and SPI_I2SCFGR_DATLEN bits

     * - ClockPolarity: SPI_I2SCFGR_CKPOL bit

     */

    /* Write to SPIx I2SCFGR */

    MODIFY_REG(SPIx->I2SCFGR,

               I2S_I2SCFGR_CLEAR_MASK,

               I2S_InitStruct->Mode | I2S_InitStruct->Standard |

               I2S_InitStruct->DataFormat | I2S_InitStruct->ClockPolarity |

               SPI_I2SCFGR_I2SMOD);

    /*---------------------------- SPIx I2SPR Configuration ----------------------

     * Configure SPIx I2SPR with parameters:

     * - MCLKOutput:    SPI_I2SPR_MCKOE bit

     * - AudioFreq:     SPI_I2SPR_I2SDIV[7:0] and SPI_I2SPR_ODD bits

     */

    /* If the requested audio frequency is not the default, compute the prescaler (i2sodd, i2sdiv)

     * else, default values are used:  i2sodd = 0U, i2sdiv = 2U.

     */

    if (I2S_InitStruct->AudioFreq != LL_I2S_AUDIOFREQ_DEFAULT)

    {

      /* Check the frame length (For the Prescaler computing)

       * Default value: LL_I2S_DATAFORMAT_16B (packetlength = 1U).

       */

      if (I2S_InitStruct->DataFormat != LL_I2S_DATAFORMAT_16B)

      {

        /* Packet length is 32 bits */

        packetlength = 2U;

      }

#if defined(I2S2_I2S3_CLOCK_FEATURE)

      /* If an external I2S clock has to be used, the specific define should be set

      in the project configuration or in the stm32f1xx_ll_rcc.h file */

      if(SPIx == SPI2)

      {

        /* Get the I2S source clock value */

        sourceclock = LL_RCC_GetI2SClockFreq(LL_RCC_I2S2_CLKSOURCE);

      }

      else /* SPI3 */

      {

        /* Get the I2S source clock value */

        sourceclock = LL_RCC_GetI2SClockFreq(LL_RCC_I2S3_CLKSOURCE);        

      }

#else

        /* I2S Clock source is System clock: Get System Clock frequency */

      LL_RCC_GetSystemClocksFreq(&rcc_clocks);

      /* Get the source clock value: based on System Clock value */

      sourceclock = rcc_clocks.SYSCLK_Frequency;    

#endif /* I2S2_I2S3_CLOCK_FEATURE */

      /* Compute the Real divider depending on the MCLK output state with a floating point */

      if (I2S_InitStruct->MCLKOutput == LL_I2S_MCLK_OUTPUT_ENABLE)

      {

        /* MCLK output is enabled */

        tmp = (uint16_t)(((((sourceclock / 256U) * 10U) / I2S_InitStruct->AudioFreq)) + 5U);

      }

      else

      {

        /* MCLK output is disabled */

        tmp = (uint16_t)(((((sourceclock / (32U * packetlength)) * 10U) / I2S_InitStruct->AudioFreq)) + 5U);

      }

      /* Remove the floating point */

      tmp = tmp / 10U;

      /* Check the parity of the divider */

      i2sodd = (uint16_t)(tmp & (uint16_t)0x0001U);

      /* Compute the i2sdiv prescaler */

      i2sdiv = (uint16_t)((tmp - i2sodd) / 2U);

      /* Get the Mask for the Odd bit (SPI_I2SPR[8]) register */

      i2sodd = (uint16_t)(i2sodd << 8U);

    }

    /* Test if the divider is 1 or 0 or greater than 0xFF */

    if ((i2sdiv < 2U) || (i2sdiv > 0xFFU))

    {

      /* Set the default values */

      i2sdiv = 2U;

      i2sodd = 0U;

    }

    /* Write to SPIx I2SPR register the computed value */

    WRITE_REG(SPIx->I2SPR, i2sdiv | i2sodd | I2S_InitStruct->MCLKOutput);

    status = SUCCESS;

  }

  return status;

}

/**

  * @brief  Set each @ref LL_I2S_InitTypeDef field to default value.

  * @param  I2S_InitStruct pointer to a @ref LL_I2S_InitTypeDef structure

  *         whose fields will be set to default values.

  * @retval None

  */

void LL_I2S_StructInit(LL_I2S_InitTypeDef *I2S_InitStruct)

{

  /*--------------- Reset I2S init structure parameters values -----------------*/

  I2S_InitStruct->Mode              = LL_I2S_MODE_SLAVE_TX;

  I2S_InitStruct->Standard          = LL_I2S_STANDARD_PHILIPS;

  I2S_InitStruct->DataFormat        = LL_I2S_DATAFORMAT_16B;

  I2S_InitStruct->MCLKOutput        = LL_I2S_MCLK_OUTPUT_DISABLE;

  I2S_InitStruct->AudioFreq         = LL_I2S_AUDIOFREQ_DEFAULT;

  I2S_InitStruct->ClockPolarity     = LL_I2S_POLARITY_LOW;

}

/**

  * @brief  Set linear and parity prescaler.

  * @note   To calculate value of PrescalerLinear(I2SDIV[7:0] bits) and PrescalerParity(ODD bit)\n

  *         Check Audio frequency table and formulas inside Reference Manual (SPI/I2S).

  * @param  SPIx SPI Instance

  * @param  PrescalerLinear value: Min_Data=0x02 and Max_Data=0xFF.

  * @param  PrescalerParity This parameter can be one of the following values:

  *         @arg @ref LL_I2S_PRESCALER_PARITY_EVEN

  *         @arg @ref LL_I2S_PRESCALER_PARITY_ODD

  * @retval None

  */

void LL_I2S_ConfigPrescaler(SPI_TypeDef *SPIx, uint32_t PrescalerLinear, uint32_t PrescalerParity)

{

  /* Check the I2S parameters */

  assert_param(IS_I2S_ALL_INSTANCE(SPIx));

  assert_param(IS_LL_I2S_PRESCALER_LINEAR(PrescalerLinear));

  assert_param(IS_LL_I2S_PRESCALER_PARITY(PrescalerParity));

  /* Write to SPIx I2SPR */

  MODIFY_REG(SPIx->I2SPR, SPI_I2SPR_I2SDIV | SPI_I2SPR_ODD, PrescalerLinear | (PrescalerParity << 8U));

}

/**

  * @}

  */

/**

  * @}

  */

/**

  * @}

  */

#endif /* SPI_I2S_SUPPORT */

#endif /* defined (SPI1) || defined (SPI2) || defined (SPI3) */

/**

  * @}

  */

#endif /* USE_FULL_LL_DRIVER */

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