text: /**
    ******************************************************************************
    * @file    stm32h7xx_ll_spi.c
    * @author  MCD Application Team
    * @brief   SPI LL module driver.
    ******************************************************************************
    * @attention
    *
    * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
    * All rights reserved.</center></h2>
    *
    * This software component is licensed by ST under BSD 3-Clause license,
    * the "License"; You may not use this file except in compliance with the
    * License. You may obtain a copy of the License at:
    *                        opensource.org/licenses/BSD-3-Clause
    *
    ******************************************************************************
    */
  #if defined(USE_FULL_LL_DRIVER)
  
  /* Includes ------------------------------------------------------------------*/
  #include "stm32h7xx_ll_spi.h"
  #include "stm32h7xx_ll_bus.h"
  #include "stm32h7xx_ll_rcc.h"
  #ifdef GENERATOR_I2S_PRESENT
  #include "stm32h7xx_ll_rcc.h"
  #endif /* GENERATOR_I2S_PRESENT*/
  #ifdef  USE_FULL_ASSERT
  #include "stm32_assert.h"
  #else
  #define assert_param(expr) ((void)0U)
  #endif
  
  /** @addtogroup STM32H7xx_LL_Driver
    * @{
    */
  
  #if defined(SPI1) || defined(SPI2) || defined(SPI3) || defined(SPI4) || defined(SPI5) || defined(SPI6)
  
  /** @addtogroup SPI_LL
    * @{
    */
  
  /* Private types -------------------------------------------------------------*/
  /* Private variables ---------------------------------------------------------*/
  /* Private constants ---------------------------------------------------------*/
  /* Private macros ------------------------------------------------------------*/
  /** @addtogroup SPI_LL_Private_Macros
    * @{
    */
  
  #define IS_LL_SPI_MODE(__VALUE__)                   (((__VALUE__) == LL_SPI_MODE_MASTER)                 \
                                                    || ((__VALUE__) == LL_SPI_MODE_SLAVE))
  
  #define IS_LL_SPI_SS_IDLENESS(__VALUE__)            (((__VALUE__) == LL_SPI_SS_IDLENESS_00CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_SS_IDLENESS_01CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_SS_IDLENESS_02CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_SS_IDLENESS_03CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_SS_IDLENESS_04CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_SS_IDLENESS_05CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_SS_IDLENESS_06CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_SS_IDLENESS_07CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_SS_IDLENESS_08CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_SS_IDLENESS_09CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_SS_IDLENESS_10CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_SS_IDLENESS_11CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_SS_IDLENESS_12CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_SS_IDLENESS_13CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_SS_IDLENESS_14CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_SS_IDLENESS_15CYCLE))
  
  #define IS_LL_SPI_ID_IDLENESS(__VALUE__)            (((__VALUE__) == LL_SPI_ID_IDLENESS_00CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_ID_IDLENESS_01CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_ID_IDLENESS_02CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_ID_IDLENESS_03CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_ID_IDLENESS_04CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_ID_IDLENESS_05CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_ID_IDLENESS_06CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_ID_IDLENESS_07CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_ID_IDLENESS_08CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_ID_IDLENESS_09CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_ID_IDLENESS_10CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_ID_IDLENESS_11CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_ID_IDLENESS_12CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_ID_IDLENESS_13CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_ID_IDLENESS_14CYCLE)         \
                                                    || ((__VALUE__) == LL_SPI_ID_IDLENESS_15CYCLE))
  
  #define IS_LL_SPI_TXCRCINIT_PATTERN(__VALUE__)      (((__VALUE__) == LL_SPI_TXCRCINIT_ALL_ZERO_PATTERN)  \
                                                    || ((__VALUE__) == LL_SPI_TXCRCINIT_ALL_ONES_PATTERN))
  
  #define IS_LL_SPI_RXCRCINIT_PATTERN(__VALUE__)      (((__VALUE__) == LL_SPI_RXCRCINIT_ALL_ZERO_PATTERN)  \
                                                    || ((__VALUE__) == LL_SPI_RXCRCINIT_ALL_ONES_PATTERN))
  
  #define IS_LL_SPI_UDR_CONFIG_REGISTER(__VALUE__)    (((__VALUE__) == LL_SPI_UDR_CONFIG_REGISTER_PATTERN) \
                                                    || ((__VALUE__) == LL_SPI_UDR_CONFIG_LAST_RECEIVED)    \
                                                    || ((__VALUE__) == LL_SPI_UDR_CONFIG_LAST_TRANSMITTED))
  
  #define IS_LL_SPI_UDR_DETECT_BEGIN_DATA(__VALUE__)  (((__VALUE__) == LL_SPI_UDR_DETECT_BEGIN_DATA_FRAME) \
                                                    || ((__VALUE__) == LL_SPI_UDR_DETECT_END_DATA_FRAME)   \
                                                    || ((__VALUE__) == LL_SPI_UDR_DETECT_BEGIN_ACTIVE_NSS))
  
  #define IS_LL_SPI_PROTOCOL(__VALUE__)               (((__VALUE__) == LL_SPI_PROTOCOL_MOTOROLA)           \
                                                    || ((__VALUE__) == LL_SPI_PROTOCOL_TI))
  
  #define IS_LL_SPI_PHASE(__VALUE__)                  (((__VALUE__) == LL_SPI_PHASE_1EDGE)                 \
                                                    || ((__VALUE__) == LL_SPI_PHASE_2EDGE))
  
  #define IS_LL_SPI_POLARITY(__VALUE__)               (((__VALUE__) == LL_SPI_POLARITY_LOW)                \
                                                    || ((__VALUE__) == LL_SPI_POLARITY_HIGH))
  
  #define IS_LL_SPI_BAUDRATEPRESCALER(__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_TRANSFER_DIRECTION(__VALUE__)     (((__VALUE__) == LL_SPI_FULL_DUPLEX)                 \
                                                    || ((__VALUE__) == LL_SPI_SIMPLEX_TX)                  \
                                                    || ((__VALUE__) == LL_SPI_SIMPLEX_RX)                  \
                                                    || ((__VALUE__) == LL_SPI_HALF_DUPLEX_RX)              \
                                                    || ((__VALUE__) == LL_SPI_HALF_DUPLEX_TX))
  
  #define IS_LL_SPI_DATAWIDTH(__VALUE__)              (((__VALUE__) == LL_SPI_DATAWIDTH_4BIT)              \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_5BIT)              \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_6BIT)              \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_7BIT)              \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_8BIT)              \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_9BIT)              \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_10BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_11BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_12BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_13BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_14BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_15BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_16BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_17BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_18BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_19BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_20BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_21BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_22BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_23BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_24BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_25BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_26BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_27BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_28BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_29BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_30BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_31BIT)             \
                                                    || ((__VALUE__) == LL_SPI_DATAWIDTH_32BIT))
  
  #define IS_LL_SPI_FIFO_TH(__VALUE__)                (((__VALUE__) == LL_SPI_FIFO_TH_01DATA)              \
                                                    || ((__VALUE__) == LL_SPI_FIFO_TH_02DATA)              \
                                                    || ((__VALUE__) == LL_SPI_FIFO_TH_03DATA)              \
                                                    || ((__VALUE__) == LL_SPI_FIFO_TH_04DATA)              \
                                                    || ((__VALUE__) == LL_SPI_FIFO_TH_05DATA)              \
                                                    || ((__VALUE__) == LL_SPI_FIFO_TH_06DATA)              \
                                                    || ((__VALUE__) == LL_SPI_FIFO_TH_07DATA)              \
                                                    || ((__VALUE__) == LL_SPI_FIFO_TH_08DATA)              \
                                                    || ((__VALUE__) == LL_SPI_FIFO_TH_09DATA)              \
                                                    || ((__VALUE__) == LL_SPI_FIFO_TH_10DATA)              \
                                                    || ((__VALUE__) == LL_SPI_FIFO_TH_11DATA)              \
                                                    || ((__VALUE__) == LL_SPI_FIFO_TH_12DATA)              \
                                                    || ((__VALUE__) == LL_SPI_FIFO_TH_13DATA)              \
                                                    || ((__VALUE__) == LL_SPI_FIFO_TH_14DATA)              \
                                                    || ((__VALUE__) == LL_SPI_FIFO_TH_15DATA)              \
                                                    || ((__VALUE__) == LL_SPI_FIFO_TH_16DATA))
  
  #define IS_LL_SPI_CRC(__VALUE__)                    (((__VALUE__) == LL_SPI_CRC_4BIT)                    \
                                                    || ((__VALUE__) == LL_SPI_CRC_5BIT)                    \
                                                    || ((__VALUE__) == LL_SPI_CRC_6BIT)                    \
                                                    || ((__VALUE__) == LL_SPI_CRC_7BIT)                    \
                                                    || ((__VALUE__) == LL_SPI_CRC_8BIT)                    \
                                                    || ((__VALUE__) == LL_SPI_CRC_9BIT)                    \
                                                    || ((__VALUE__) == LL_SPI_CRC_10BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_11BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_12BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_13BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_14BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_15BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_16BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_17BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_18BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_19BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_20BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_21BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_22BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_23BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_24BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_25BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_26BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_27BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_28BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_29BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_30BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_31BIT)                   \
                                                    || ((__VALUE__) == LL_SPI_CRC_32BIT))
  
  #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_RX_FIFO(__VALUE__)                (((__VALUE__) == LL_SPI_RX_FIFO_0PACKET)             \
                                                    || ((__VALUE__) == LL_SPI_RX_FIFO_1PACKET)             \
                                                    || ((__VALUE__) == LL_SPI_RX_FIFO_2PACKET)             \
                                                    || ((__VALUE__) == LL_SPI_RX_FIFO_3PACKET))
  
  #define IS_LL_SPI_CRCCALCULATION(__VALUE__)         (((__VALUE__) == LL_SPI_CRCCALCULATION_ENABLE)       \
                                                    || ((__VALUE__) == LL_SPI_CRCCALCULATION_DISABLE))
  
  #define IS_LL_SPI_CRC_POLYNOMIAL(__VALUE__)          ((__VALUE__) >= 0x1UL)
  
  /**
    * @}
    */
  
  /* 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 */
  #if defined(SPI4)
    if (SPIx == SPI4)
    {
      /* Force reset of SPI clock */
      LL_APB2_GRP1_ForceReset(LL_APB2_GRP1_PERIPH_SPI4);
  
      /* Release reset of SPI clock */
      LL_APB2_GRP1_ReleaseReset(LL_APB2_GRP1_PERIPH_SPI4);
  
      status = SUCCESS;
    }
  #endif /* SPI4 */
  #if defined(SPI5)
    if (SPIx == SPI5)
    {
      /* Force reset of SPI clock */
      LL_APB2_GRP1_ForceReset(LL_APB2_GRP1_PERIPH_SPI5);
  
      /* Release reset of SPI clock */
      LL_APB2_GRP1_ReleaseReset(LL_APB2_GRP1_PERIPH_SPI5);
  
      status = SUCCESS;
    }
  #endif /* SPI5 */
  #if defined(SPI6)
    if (SPIx == SPI6)
    {
      /* Force reset of SPI clock */
      LL_APB4_GRP1_ForceReset(LL_APB4_GRP1_PERIPH_SPI6);
  
      /* Release reset of SPI clock */
      LL_APB4_GRP1_ReleaseReset(LL_APB4_GRP1_PERIPH_SPI6);
  
      status = SUCCESS;
    }
  #endif /* SPI6 */
  
    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;
    uint32_t tmp_nss;
    uint32_t tmp_mode;
  
    /* 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_BAUDRATEPRESCALER(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) == 0x00000000UL)
    {
      /*---------------------------- SPIx CFG1 Configuration ------------------------
         * Configure SPIx CFG1 with parameters:
         * - Master Baud Rate       : SPI_CFG1_MBR[2:0] bits
         * - CRC Computation Enable : SPI_CFG1_CRCEN bit
         * - Length of data frame   : SPI_CFG1_DSIZE[4:0] bits
         */
      MODIFY_REG(SPIx->CFG1, SPI_CFG1_MBR              | SPI_CFG1_CRCEN                 | SPI_CFG1_DSIZE,
                 SPI_InitStruct->BaudRate  | SPI_InitStruct->CRCCalculation | SPI_InitStruct->DataWidth);
  
      tmp_nss  = SPI_InitStruct->NSS;
      tmp_mode = SPI_InitStruct->Mode;
  
      /* Checks to setup Internal SS signal level and avoid a MODF Error */
      if ((LL_SPI_GetNSSPolarity(SPIx) == LL_SPI_NSS_POLARITY_LOW) && (tmp_nss == LL_SPI_NSS_SOFT) && (tmp_mode == LL_SPI_MODE_MASTER))
      {
        LL_SPI_SetInternalSSLevel(SPIx, LL_SPI_SS_LEVEL_HIGH);
      }
  
      /*---------------------------- SPIx CFG2 Configuration ------------------------
         * Configure SPIx CFG2 with parameters:
         * - NSS management         : SPI_CFG2_SSM, SPI_CFG2_SSOE bits
         * - ClockPolarity          : SPI_CFG2_CPOL bit
         * - ClockPhase             : SPI_CFG2_CPHA bit
         * - BitOrder               : SPI_CFG2_LSBFRST bit
         * - Master/Slave Mode      : SPI_CFG2_MASTER bit
         * - SPI Mode               : SPI_CFG2_COMM[1:0] bits
         */
      MODIFY_REG(SPIx->CFG2, SPI_CFG2_SSM   | SPI_CFG2_SSOE    |
                 SPI_CFG2_CPOL              | SPI_CFG2_CPHA    |
                 SPI_CFG2_LSBFRST           | SPI_CFG2_MASTER  | SPI_CFG2_COMM,
                 SPI_InitStruct->NSS        |   SPI_InitStruct->ClockPolarity                    |
                 SPI_InitStruct->ClockPhase |   SPI_InitStruct->BitOrder                         |
                 SPI_InitStruct->Mode       | (SPI_InitStruct->TransferDirection & SPI_CFG2_COMM));
  
      /*---------------------------- SPIx CR1 Configuration ------------------------
         * Configure SPIx CR1 with parameter:
         * - Half Duplex Direction  : SPI_CR1_HDDIR bit
         */
      MODIFY_REG(SPIx->CR1, SPI_CR1_HDDIR, SPI_InitStruct->TransferDirection & SPI_CR1_HDDIR);
  
      /*---------------------------- SPIx CRCPOLY Configuration ----------------------
         * Configure SPIx CRCPOLY with parameter:
         * - CRCPoly                : CRCPOLY[31:0] 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);
      }
  
      /* Activate the SPI mode (Reset I2SMOD bit in I2SCFGR register) */
      CLEAR_BIT(SPIx->I2SCFGR, SPI_I2SCFGR_I2SMOD);
  
      status = SUCCESS;
    }
  
    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           = 7UL;
  }
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  /** @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_DATFMT  | SPI_I2SCFGR_CKPOL  | \
                                                        SPI_I2SCFGR_I2SSTD  | SPI_I2SCFGR_MCKOE  | \
                                                        SPI_I2SCFGR_I2SCFG  | SPI_I2SCFGR_I2SMOD )
  
  /**
    * @}
    */
  /* 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_24B_LEFT_ALIGNED) \
                                                   || ((__VALUE__) == LL_I2S_DATAFORMAT_32B))
  
  #define IS_LL_I2S_CHANNEL_LENGTH_TYPE (__VALUE__)  (((__VALUE__) == LL_I2S_SLAVE_VARIABLE_CH_LENGTH)    \
                                                   || ((__VALUE__) == LL_I2S_SLAVE_FIXED_CH_LENGTH))
  
  #define IS_LL_I2S_CKPOL(__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_SLAVE_FULL_DUPLEX)      \
                                                   || ((__VALUE__) == LL_I2S_MODE_MASTER_TX)              \
                                                   || ((__VALUE__) == LL_I2S_MODE_MASTER_RX)              \
                                                   || ((__VALUE__) == LL_I2S_MODE_MASTER_FULL_DUPLEX))
  
  #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__) <= 0xFFUL)
  
  #define IS_LL_I2S_PRESCALER_PARITY(__VALUE__)      (((__VALUE__) == LL_I2S_PRESCALER_PARITY_EVEN)       \
                                                   || ((__VALUE__) == LL_I2S_PRESCALER_PARITY_ODD))
  
  #define IS_LL_I2S_FIFO_TH (__VALUE__)              (((__VALUE__) == LL_I2S_LL_I2S_FIFO_TH_01DATA)       \
                                                   || ((__VALUE__) == LL_I2S_LL_I2S_FIFO_TH_02DATA)       \
                                                   || ((__VALUE__) == LL_I2S_LL_I2S_FIFO_TH_03DATA)       \
                                                   || ((__VALUE__) == LL_I2S_LL_I2S_FIFO_TH_04DATA)       \
                                                   || ((__VALUE__) == LL_I2S_LL_I2S_FIFO_TH_05DATA)       \
                                                   || ((__VALUE__) == LL_I2S_LL_I2S_FIFO_TH_06DATA)       \
                                                   || ((__VALUE__) == LL_I2S_LL_I2S_FIFO_TH_07DATA)       \
                                                   || ((__VALUE__) == LL_I2S_LL_I2S_FIFO_TH_08DATA))
  
  #define IS_LL_I2S_BIT_ORDER(__VALUE__)             (((__VALUE__) == LL_I2S_LSB_FIRST)                   \
                                                   || ((__VALUE__) == LL_I2S_MSB_FIRST))
  /**
    * @}
    */
  
  /* 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 I2S 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.
    * @note   I2S (SPI) source clock must be ready before calling this function. Otherwise will results in wrong programming.
    * @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)
  {
    uint32_t i2sdiv = 0UL, i2sodd = 0UL, packetlength = 1UL, ispcm = 0UL;
    uint32_t tmp;
    uint32_t sourceclock;
    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_CKPOL(I2S_InitStruct->ClockPolarity));
  
    /* Check that SPE bit is set to 0 in order to be sure that SPI/I2S block is disabled.
     * In this case, it is useless to check if the I2SMOD bit is set to 0 because
     * this bit I2SMOD only serves to select the desired mode.
     */
    if (LL_SPI_IsEnabled(SPIx) == 0x00000000UL)
    {
      /*---------------------------- SPIx I2SCFGR Configuration --------------------
       * Configure SPIx I2SCFGR with parameters:
       * - Mode           : SPI_I2SCFGR_I2SCFG[2:0] bits
       * - Standard       : SPI_I2SCFGR_I2SSTD[1:0] and SPI_I2SCFGR_PCMSYNC bits
       * - DataFormat     : SPI_I2SCFGR_CHLEN, SPI_I2SCFGR_DATFMT and SPI_I2SCFGR_DATLEN[1:0] bits
       * - ClockPolarity  : SPI_I2SCFGR_CKPOL bit
       * - MCLKOutput     : SPI_I2SPR_MCKOE bit
       * - I2S mode       : SPI_I2SCFGR_I2SMOD 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 |
                 I2S_InitStruct->MCLKOutput | SPI_I2SCFGR_I2SMOD);
  
      /*---------------------------- SPIx I2SCFGR Configuration ----------------------
       * Configure SPIx I2SCFGR with parameters:
       * - AudioFreq      : SPI_I2SCFGR_I2SDIV[7:0] and SPI_I2SCFGR_ODD bits
       */
  
      /* If the requested audio frequency is not the default, compute the prescaler (i2sodd, i2sdiv)
       * else, default values are used:  i2sodd = 0U, i2sdiv = 0U.
       */
      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 = 2UL;
        }
  
        /* Check if PCM standard is used */
        if ((I2S_InitStruct->Standard == LL_I2S_STANDARD_PCM_SHORT) ||
            (I2S_InitStruct->Standard == LL_I2S_STANDARD_PCM_LONG))
        {
          ispcm = 1UL;
        }
  
        /* Get the I2S (SPI) source clock value */
  #if defined (SPI_SPI6I2S_SUPPORT)
        if (SPIx == SPI6)
        {
          sourceclock = LL_RCC_GetSPIClockFreq(LL_RCC_SPI6_CLKSOURCE);
        }
        else
        {
          sourceclock = LL_RCC_GetSPIClockFreq(LL_RCC_SPI123_CLKSOURCE);
        }
  #else
        sourceclock = LL_RCC_GetSPIClockFreq(LL_RCC_SPI123_CLKSOURCE);
  #endif
  
        /* Compute the Real divider depending on the MCLK output state with a fixed point */
        if (I2S_InitStruct->MCLKOutput == LL_I2S_MCLK_OUTPUT_ENABLE)
        {
          /* MCLK output is enabled */
          tmp = (((sourceclock / (256UL >> ispcm)) * 16UL) / I2S_InitStruct->AudioFreq) + 8UL;
        }
        else
        {
          /* MCLK output is disabled */
          tmp = (((sourceclock / ((32UL >> ispcm) * packetlength)) * 16UL) / I2S_InitStruct->AudioFreq) + 8UL;
        }
  
        /* Remove the fixed point */
        tmp = tmp / 16UL;
  
        /* Check the parity of the divider */
        i2sodd = tmp & 0x1UL;
  
        /* Compute the i2sdiv prescaler */
        i2sdiv = tmp / 2UL;
      }
  
      /* Test if the obtain values are forbiden or out of range */
      if (((i2sodd == 1UL) && (i2sdiv == 1UL)) || (i2sdiv > 0xFFUL))
      {
        /* Set the default values */
        i2sdiv = 0UL;
        i2sodd = 0UL;
      }
  
      /* Write to SPIx I2SCFGR register the computed value */
      MODIFY_REG(SPIx->I2SCFGR,
                 SPI_I2SCFGR_ODD                 | SPI_I2SCFGR_I2SDIV,
                 (i2sodd << SPI_I2SCFGR_ODD_Pos) | (i2sdiv << SPI_I2SCFGR_I2SDIV_Pos));
  
      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 between Min_Data=0x00 and Max_Data=0xFF
    * @note   PrescalerLinear '1' is not authorized with parity LL_I2S_PRESCALER_PARITY_ODD
    * @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->I2SCFGR, SPI_I2SCFGR_I2SDIV | SPI_I2SCFGR_ODD, (PrescalerLinear << SPI_I2SCFGR_I2SDIV_Pos) |
               (PrescalerParity << SPI_I2SCFGR_ODD_Pos));
  }
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  #endif /* defined(SPI1) || defined(SPI2) || defined(SPI3) || defined(SPI4) || defined(SPI5) || defined(SPI6) */
  
  /**
    * @}
    */
  #endif /* USE_FULL_LL_DRIVER */
  
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  