FT32F0xx_Driver/Src/ft32f0xx_spi.c

/**
  ******************************************************************************
  * @file               ft32f0xx_spi.c
  * @author             FMD AE
  * @brief              This file provides firmware functions to manage the following
  *                     functionalities of the Serial peripheral interface (SPI):
  *                 + Initialization and Configuration
  *                 + Data transfers functions
  *                 + Hardware CRC Calculation
  *                 + DMA transfers management
  *                 + Interrupts and flags management
  * @version            V1.0.0
  * @data                   2021-07-01
    ******************************************************************************
  */
/* Includes ------------------------------------------------------------------*/
#include "ft32f0xx_spi.h"
#include "ft32f0xx_rcc.h"

/* SPI registers Masks */
#define CR1_CLEAR_MASK       ((uint16_t)0x3040)
#define CR1_CLEAR_MASK2      ((uint16_t)0xFFFB)
#define CR2_LDMA_MASK        ((uint16_t)0x9FFF)

#define I2SCFGR_CLEAR_Mask   ((uint16_t)0xF040)


/**
  * @brief  Deinitializes the SPIx peripheral registers to their default
  *         reset values.
  * @param  SPIx: where x can be 1 or 2 to select the SPI peripheral.
  * @retval None
  */
void SPI_I2S_DeInit(SPI_TypeDef* SPIx)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));

  if (SPIx == SPI1)
  {
    /* Enable SPI1 reset state */
    RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, ENABLE);
    /* Release SPI1 from reset state */
    RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, DISABLE);
  }
  else
  {
    if (SPIx == SPI2)
    {
      /* Enable SPI2 reset state */
      RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, ENABLE);
      /* Release SPI2 from reset state */
      RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, DISABLE);
    }
  }
}

/**
  * @brief  Fills each SPI_InitStruct member with its default value.
  * @param  SPI_InitStruct: pointer to a SPI_InitTypeDef structure which will be initialized.
  * @retval None
  */
void SPI_StructInit(SPI_InitTypeDef* SPI_InitStruct)
{
/*--------------- Reset SPI init structure parameters values -----------------*/
  /* Initialize the SPI_Direction member */
  SPI_InitStruct->SPI_Direction = SPI_Direction_2Lines_FullDuplex;
  /* Initialize the SPI_Mode member */
  SPI_InitStruct->SPI_Mode = SPI_Mode_Slave;
  /* Initialize the SPI_DataSize member */
  SPI_InitStruct->SPI_DataSize = SPI_DataSize_8b;
  /* Initialize the SPI_CPOL member */
  SPI_InitStruct->SPI_CPOL = SPI_CPOL_Low;
  /* Initialize the SPI_CPHA member */
  SPI_InitStruct->SPI_CPHA = SPI_CPHA_1Edge;
  /* Initialize the SPI_NSS member */
  SPI_InitStruct->SPI_NSS = SPI_NSS_Hard;
  /* Initialize the SPI_BaudRatePrescaler member */
  SPI_InitStruct->SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
  /* Initialize the SPI_FirstBit member */
  SPI_InitStruct->SPI_FirstBit = SPI_FirstBit_MSB;
  /* Initialize the SPI_CRCPolynomial member */
  SPI_InitStruct->SPI_CRCPolynomial = 7;
}

/**
  * @brief  Initializes the SPIx peripheral according to the specified
  *         parameters in the SPI_InitStruct.
  * @param  SPIx: where x can be 1 or 2 to select the SPI peripheral.
  * @param  SPI_InitStruct: pointer to a SPI_InitTypeDef structure that
  *         contains the configuration information for the specified SPI peripheral.
  * @retval None
  */
void SPI_Init(SPI_TypeDef* SPIx, SPI_InitTypeDef* SPI_InitStruct)
{
  uint16_t tmpreg = 0;

  /* check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));

  /* Check the SPI parameters */
  assert_param(IS_SPI_DIRECTION_MODE(SPI_InitStruct->SPI_Direction));
  assert_param(IS_SPI_MODE(SPI_InitStruct->SPI_Mode));
  assert_param(IS_SPI_DATA_SIZE(SPI_InitStruct->SPI_DataSize));
  assert_param(IS_SPI_CPOL(SPI_InitStruct->SPI_CPOL));
  assert_param(IS_SPI_CPHA(SPI_InitStruct->SPI_CPHA));
  assert_param(IS_SPI_NSS(SPI_InitStruct->SPI_NSS));
  assert_param(IS_SPI_BAUDRATE_PRESCALER(SPI_InitStruct->SPI_BaudRatePrescaler));
  assert_param(IS_SPI_FIRST_BIT(SPI_InitStruct->SPI_FirstBit));
  assert_param(IS_SPI_CRC_POLYNOMIAL(SPI_InitStruct->SPI_CRCPolynomial));

  /*---------------------------- SPIx CR1 Configuration ------------------------*/
  /* Get the SPIx CR1 value */
  tmpreg = SPIx->CR1;
  /* Clear BIDIMode, BIDIOE, RxONLY, SSM, SSI, LSBFirst, BR, CPOL and CPHA bits */
  tmpreg &= CR1_CLEAR_MASK;
  /* Configure SPIx: direction, NSS management, first transmitted bit, BaudRate prescaler
  master/slave mode, CPOL and CPHA */
  /* Set BIDImode, BIDIOE and RxONLY bits according to SPI_Direction value */
  /* Set SSM, SSI bit according to SPI_NSS values */
  /* Set LSBFirst bit according to SPI_FirstBit value */
  /* Set BR bits according to SPI_BaudRatePrescaler value */
  /* Set CPOL bit according to SPI_CPOL value */
  /* Set CPHA bit according to SPI_CPHA value */
  tmpreg |= (uint16_t)((uint32_t)SPI_InitStruct->SPI_Direction | SPI_InitStruct->SPI_FirstBit |
                      SPI_InitStruct->SPI_CPOL | SPI_InitStruct->SPI_CPHA |
                      SPI_InitStruct->SPI_NSS | SPI_InitStruct->SPI_BaudRatePrescaler);
  /* Write to SPIx CR1 */
  SPIx->CR1 = tmpreg;
  /*-------------------------Data Size Configuration -----------------------*/
  /* Get the SPIx CR2 value */
  tmpreg = SPIx->CR2;
  /* Clear DS[3:0] bits */
  tmpreg &=(uint16_t)~SPI_CR2_DS;
  /* Configure SPIx: Data Size */
  tmpreg |= (uint16_t)(SPI_InitStruct->SPI_DataSize);
  /* Write to SPIx CR2 */
  SPIx->CR2 = tmpreg;

  /*---------------------------- SPIx CRCPOLY Configuration --------------------*/
  /* Write to SPIx CRCPOLY */
  SPIx->CRCPR = SPI_InitStruct->SPI_CRCPolynomial;

  /*---------------------------- SPIx CR1 Configuration ------------------------*/
  /* Get the SPIx CR1 value */
  tmpreg = SPIx->CR1;
  /* Clear MSTR bit */
  tmpreg &= CR1_CLEAR_MASK2;
  /* Configure SPIx: master/slave mode */
  /* Set MSTR bit according to SPI_Mode */
  tmpreg |= (uint16_t)((uint32_t)SPI_InitStruct->SPI_Mode);
  /* Write to SPIx CR1 */
  SPIx->CR1 = tmpreg;

//  /* Activate the SPI mode (Reset I2SMOD bit in I2SCFGR register) */
//  SPIx->I2SCFGR &= (uint16_t)~((uint16_t)SPI_I2SCFGR_I2SMOD);
}
/**
  * @brief  Enables or disables the specified SPI peripheral.
  * @param  SPIx: where x can be 1 or 2 to select the SPI peripheral.
  * @param  NewState: new state of the SPIx peripheral.
  *          This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void SPI_Cmd(SPI_TypeDef* SPIx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the selected SPI peripheral */
    SPIx->CR1 |= SPI_CR1_SPE;
  }
  else
  {
    /* Disable the selected SPI peripheral */
    SPIx->CR1 &= (uint16_t)~((uint16_t)SPI_CR1_SPE);
  }
}

/**
  * @brief  Enables or disables the TI Mode.
  *
  * @note   This function can be called only after the SPI_Init() function has
  *         been called.
  * @note   When TI mode is selected, the control bits SSM, SSI, CPOL and CPHA
  *         are not taken into consideration and are configured by hardware
  *         respectively to the TI mode requirements.
  *
  * @param  SPIx: where x can be 1 or 2 to select the SPI peripheral.
  * @param  NewState: new state of the selected SPI TI communication mode.
  *          This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void SPI_TIModeCmd(SPI_TypeDef* SPIx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the TI mode for the selected SPI peripheral */
    SPIx->CR2 |= SPI_CR2_FRF;
  }
  else
  {
    /* Disable the TI mode for the selected SPI peripheral */
    SPIx->CR2 &= (uint16_t)~((uint16_t)SPI_CR2_FRF);
  }
}
/**
  * @brief  Configures the data size for the selected SPI.
  * @param  SPIx: where x can be 1 or 2  to select the SPI peripheral.
  * @param  SPI_DataSize: specifies the SPI data size.
  *         For the SPIx peripheral this parameter can be one of the following values:
  *            @arg SPI_DataSize_4b: Set data size to 4 bits
  *            @arg SPI_DataSize_5b: Set data size to 5 bits
  *            @arg SPI_DataSize_6b: Set data size to 6 bits
  *            @arg SPI_DataSize_7b: Set data size to 7 bits
  *            @arg SPI_DataSize_8b: Set data size to 8 bits
  *            @arg SPI_DataSize_9b: Set data size to 9 bits
  *            @arg SPI_DataSize_10b: Set data size to 10 bits
  *            @arg SPI_DataSize_11b: Set data size to 11 bits
  *            @arg SPI_DataSize_12b: Set data size to 12 bits
  *            @arg SPI_DataSize_13b: Set data size to 13 bits
  *            @arg SPI_DataSize_14b: Set data size to 14 bits
  *            @arg SPI_DataSize_15b: Set data size to 15 bits
  *            @arg SPI_DataSize_16b: Set data size to 16 bits
  * @retval None
  */
void SPI_DataSizeConfig(SPI_TypeDef* SPIx, uint16_t SPI_DataSize)
{
  uint16_t tmpreg = 0;

  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_SPI_DATA_SIZE(SPI_DataSize));
  /* Read the CR2 register */
  tmpreg = SPIx->CR2;
  /* Clear DS[3:0] bits */
  tmpreg &= (uint16_t)~SPI_CR2_DS;
  /* Set new DS[3:0] bits value */
  tmpreg |= SPI_DataSize;
  SPIx->CR2 = tmpreg;
}

/**
  * @brief  Configures the FIFO reception threshold for the selected SPI.
  * @param  SPIx: where x can be 1 or 2 to select the SPI peripheral.
  * @param  SPI_RxFIFOThreshold: specifies the FIFO reception threshold.
  *          This parameter can be one of the following values:
  *            @arg SPI_RxFIFOThreshold_HF: RXNE event is generated if the FIFO
  *                                         level is greater or equal to 1/2.
  *            @arg SPI_RxFIFOThreshold_QF: RXNE event is generated if the FIFO
  *                                         level is greater or equal to 1/4.
  * @retval None
  */
void SPI_RxFIFOThresholdConfig(SPI_TypeDef* SPIx, uint16_t SPI_RxFIFOThreshold)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_SPI_RX_FIFO_THRESHOLD(SPI_RxFIFOThreshold));

  /* Clear FRXTH bit */
  SPIx->CR2 &= (uint16_t)~((uint16_t)SPI_CR2_FRXTH);

  /* Set new FRXTH bit value */
  SPIx->CR2 |= SPI_RxFIFOThreshold;
}

/**
  * @brief  Selects the data transfer direction in bidirectional mode for the specified SPI.
  * @param  SPIx: where x can be 1 or 2  to select the SPI peripheral.
  * @param  SPI_Direction: specifies the data transfer direction in bidirectional mode.
  *          This parameter can be one of the following values:
  *            @arg SPI_Direction_Tx: Selects Tx transmission direction
  *            @arg SPI_Direction_Rx: Selects Rx receive direction
  * @retval None
  */
void SPI_BiDirectionalLineConfig(SPI_TypeDef* SPIx, uint16_t SPI_Direction)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_SPI_DIRECTION(SPI_Direction));
  if (SPI_Direction == SPI_Direction_Tx)
  {
    /* Set the Tx only mode */
    SPIx->CR1 |= SPI_Direction_Tx;
  }
  else
  {
    /* Set the Rx only mode */
    SPIx->CR1 &= SPI_Direction_Rx;
  }
}

/**
  * @brief  Configures internally by software the NSS pin for the selected SPI.
  * @note   This function can be called only after the SPI_Init() function has
  *         been called.
  * @param  SPIx: where x can be 1 or 2 to select the SPI peripheral.
  * @param  SPI_NSSInternalSoft: specifies the SPI NSS internal state.
  *          This parameter can be one of the following values:
  *            @arg SPI_NSSInternalSoft_Set: Set NSS pin internally
  *            @arg SPI_NSSInternalSoft_Reset: Reset NSS pin internally
  * @retval None
  */
void SPI_NSSInternalSoftwareConfig(SPI_TypeDef* SPIx, uint16_t SPI_NSSInternalSoft)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_SPI_NSS_INTERNAL(SPI_NSSInternalSoft));

  if (SPI_NSSInternalSoft != SPI_NSSInternalSoft_Reset)
  {
    /* Set NSS pin internally by software */
    SPIx->CR1 |= SPI_NSSInternalSoft_Set;
  }
  else
  {
    /* Reset NSS pin internally by software */
    SPIx->CR1 &= SPI_NSSInternalSoft_Reset;
  }
}

/**
  * @brief  Enables or disables the SS output for the selected SPI.
  * @note   This function can be called only after the SPI_Init() function has
  *         been called and the NSS hardware management mode is selected.
  * @param  SPIx: where x can be 1 or 2 to select the SPI peripheral.
  * @param  NewState: new state of the SPIx SS output.
  *          This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void SPI_SSOutputCmd(SPI_TypeDef* SPIx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  if (NewState != DISABLE)
  {
    /* Enable the selected SPI SS output */
    SPIx->CR2 |= SPI_CR2_SSOE;
  }
  else
  {
    /* Disable the selected SPI SS output */
    SPIx->CR2 &= (uint16_t)~((uint16_t)SPI_CR2_SSOE);
  }
}

/**
  * @brief  Enables or disables the NSS pulse management mode.
  * @note   This function can be called only after the SPI_Init() function has
  *         been called.
  * @note   When TI mode is selected, the control bits NSSP is not taken into
  *         consideration and are configured by hardware respectively to the
  *         TI mode requirements.
  * @param  SPIx: where x can be 1 or 2 to select the SPI peripheral.
  * @param  NewState: new state of the NSS pulse management mode.
  *          This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void SPI_NSSPulseModeCmd(SPI_TypeDef* SPIx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the NSS pulse management mode */
    SPIx->CR2 |= SPI_CR2_NSSP;
  }
  else
  {
    /* Disable the NSS pulse management mode */
    SPIx->CR2 &= (uint16_t)~((uint16_t)SPI_CR2_NSSP);
  }
}

/**
  * @}
  */
/**
  * @brief  Transmits a Data through the SPIx/I2Sx peripheral.
  * @param  SPIx: where x can be 1 or 2 in SPI mode to select the SPI peripheral.
  * @param  Data: Data to be transmitted.
  * @retval None
  */
void SPI_SendData8(SPI_TypeDef* SPIx, uint8_t Data)
{
  uint32_t spixbase = 0x00;

  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));

  spixbase = (uint32_t)SPIx;
  spixbase += 0x0C;

  *(__IO uint8_t *) spixbase = Data;
}

/**
  * @brief  Transmits a Data through the SPIx/I2Sx peripheral.
  * @param  SPIx: where x can be 1 or 2 in SPI mode or 1 in I2S mode to select
  *         the SPI peripheral.
  * @param  Data: Data to be transmitted.
  * @retval None
  */
void SPI_I2S_SendData16(SPI_TypeDef* SPIx, uint16_t Data)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));

  SPIx->DR = (uint16_t)Data;
}

/**
  * @brief  Returns the most recent received data by the SPIx/I2Sx peripheral.
  * @param  SPIx: where x can be 1 or 2 in SPI mode to select the SPI peripheral.
  * @retval The value of the received data.
  */
uint8_t SPI_ReceiveData8(SPI_TypeDef* SPIx)
{
  uint32_t spixbase = 0x00;

  spixbase = (uint32_t)SPIx;
  spixbase += 0x0C;

  return *(__IO uint8_t *) spixbase;
}

/**
  * @brief  Returns the most recent received data by the SPIx peripheral.
  * @param  SPIx: where x can be 1 or 2 in SPI mode or 1 in I2S mode to select
  *         the SPI peripheral.
  * @retval The value of the received data.
  */
uint16_t SPI_I2S_ReceiveData16(SPI_TypeDef* SPIx)
{
  return SPIx->DR;
}
/**
  * @}
  */
/**
  * @brief  Configures the CRC calculation length for the selected SPI.
  * @note   This function can be called only after the SPI_Init() function has
  *         been called.
  * @param  SPIx: where x can be 1 or 2 to select the SPI peripheral.
  * @param  SPI_CRCLength: specifies the SPI CRC calculation length.
  *          This parameter can be one of the following values:
  *            @arg SPI_CRCLength_8b: Set CRC Calculation to 8 bits
  *            @arg SPI_CRCLength_16b: Set CRC Calculation to 16 bits
  * @retval None
  */
void SPI_CRCLengthConfig(SPI_TypeDef* SPIx, uint16_t SPI_CRCLength)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_SPI_CRC_LENGTH(SPI_CRCLength));

  /* Clear CRCL bit */
  SPIx->CR1 &= (uint16_t)~((uint16_t)SPI_CR1_CRCL);

  /* Set new CRCL bit value */
  SPIx->CR1 |= SPI_CRCLength;
}

/**
  * @brief  Enables or disables the CRC value calculation of the transferred bytes.
  * @note   This function can be called only after the SPI_Init() function has
  *         been called.
  * @param  SPIx: where x can be 1 or 2 to select the SPI peripheral.
  * @param  NewState: new state of the SPIx CRC value calculation.
  *          This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void SPI_CalculateCRC(SPI_TypeDef* SPIx, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  {
    /* Enable the selected SPI CRC calculation */
    SPIx->CR1 |= SPI_CR1_CRCEN;
  }
  else
  {
    /* Disable the selected SPI CRC calculation */
    SPIx->CR1 &= (uint16_t)~((uint16_t)SPI_CR1_CRCEN);
  }
}

/**
  * @brief  Transmit the SPIx CRC value.
  * @param  SPIx: where x can be 1 or 2 to select the SPI peripheral.
  * @retval None
  */
void SPI_TransmitCRC(SPI_TypeDef* SPIx)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));

  /* Enable the selected SPI CRC transmission */
  SPIx->CR1 |= SPI_CR1_CRCNEXT;
}

/**
  * @brief  Returns the transmit or the receive CRC register value for the specified SPI.
  * @param  SPIx: where x can be 1 or 2 to select the SPI peripheral.
  * @param  SPI_CRC: specifies the CRC register to be read.
  *          This parameter can be one of the following values:
  *            @arg SPI_CRC_Tx: Selects Tx CRC register
  *            @arg SPI_CRC_Rx: Selects Rx CRC register
  * @retval The selected CRC register value..
  */
uint16_t SPI_GetCRC(SPI_TypeDef* SPIx, uint8_t SPI_CRC)
{
  uint16_t crcreg = 0;
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_SPI_CRC(SPI_CRC));

  if (SPI_CRC != SPI_CRC_Rx)
  {
    /* Get the Tx CRC register */
    crcreg = SPIx->TXCRCR;
  }
  else
  {
    /* Get the Rx CRC register */
    crcreg = SPIx->RXCRCR;
  }
  /* Return the selected CRC register */
  return crcreg;
}

/**
  * @brief  Returns the CRC Polynomial register value for the specified SPI.
  * @param  SPIx: where x can be 1 or 2 to select the SPI peripheral.
  * @retval The CRC Polynomial register value.
  */
uint16_t SPI_GetCRCPolynomial(SPI_TypeDef* SPIx)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));

  /* Return the CRC polynomial register */
  return SPIx->CRCPR;
}

/**
  * @}
  */
/**
  * @brief  Enables or disables the SPIx/I2Sx DMA interface.
  * @param  SPIx: where x can be 1 or 2 in SPI mode or 1 in I2S mode to select
  *         the SPI peripheral.
  * @param  SPI_I2S_DMAReq: specifies the SPI DMA transfer request to be enabled or disabled.
  *          This parameter can be any combination of the following values:
  *            @arg SPI_I2S_DMAReq_Tx: Tx buffer DMA transfer request
  *            @arg SPI_I2S_DMAReq_Rx: Rx buffer DMA transfer request
  * @param  NewState: new state of the selected SPI DMA transfer request.
  *          This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void SPI_I2S_DMACmd(SPI_TypeDef* SPIx, uint16_t SPI_I2S_DMAReq, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  assert_param(IS_SPI_I2S_DMA_REQ(SPI_I2S_DMAReq));

  if (NewState != DISABLE)
  {
    /* Enable the selected SPI DMA requests */
    SPIx->CR2 |= SPI_I2S_DMAReq;
  }
  else
  {
    /* Disable the selected SPI DMA requests */
    SPIx->CR2 &= (uint16_t)~SPI_I2S_DMAReq;
  }
}

/**
  * @brief  Configures the number of data to transfer type(Even/Odd) for the DMA
  *         last transfers and for the selected SPI.
  * @note   This function have a meaning only if DMA mode is selected and if
  *         the packing mode is used (data length <= 8 and DMA transfer size halfword)
  * @param  SPIx: where x can be 1 or 2 to select the SPI peripheral.
  * @param  SPI_LastDMATransfer: specifies the SPI last DMA transfers state.
  *          This parameter can be one of the following values:
  *            @arg SPI_LastDMATransfer_TxEvenRxEven: Number of data for transmission Even
  *                                                   and number of data for reception Even.
  *            @arg SPI_LastDMATransfer_TxOddRxEven: Number of data for transmission Odd
  *                                                  and number of data for reception Even.
  *            @arg SPI_LastDMATransfer_TxEvenRxOdd: Number of data for transmission Even
  *                                                  and number of data for reception Odd.
  *            @arg SPI_LastDMATransfer_TxOddRxOdd: Number of data for transmission Odd
  *                                                 and number of data for reception Odd.
  * @retval None
  */
void SPI_LastDMATransferCmd(SPI_TypeDef* SPIx, uint16_t SPI_LastDMATransfer)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_SPI_LAST_DMA_TRANSFER(SPI_LastDMATransfer));

  /* Clear LDMA_TX and LDMA_RX bits */
  SPIx->CR2 &= CR2_LDMA_MASK;

  /* Set new LDMA_TX and LDMA_RX bits value */
  SPIx->CR2 |= SPI_LastDMATransfer;
}

/**
  * @}
  */
/**
  * @brief  Enables or disables the specified SPI/I2S interrupts.
  * @param  SPIx: where x can be 1 or 2 in SPI mode or 1 in I2S mode to select
  *         the SPI peripheral.
  * @param  SPI_I2S_IT: specifies the SPI interrupt source to be enabled or disabled.
  *          This parameter can be one of the following values:
  *            @arg SPI_I2S_IT_TXE: Tx buffer empty interrupt mask
  *            @arg SPI_I2S_IT_RXNE: Rx buffer not empty interrupt mask
  *            @arg SPI_I2S_IT_ERR: Error interrupt mask
  * @param  NewState: new state of the specified SPI interrupt.
  *          This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void SPI_I2S_ITConfig(SPI_TypeDef* SPIx, uint8_t SPI_I2S_IT, FunctionalState NewState)
{
  uint16_t itpos = 0, itmask = 0 ;

  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_FUNCTIONAL_STATE(NewState));
  assert_param(IS_SPI_I2S_CONFIG_IT(SPI_I2S_IT));

  /* Get the SPI IT index */
  itpos = SPI_I2S_IT >> 4;

  /* Set the IT mask */
  itmask = (uint16_t)1 << (uint16_t)itpos;

  if (NewState != DISABLE)
  {
    /* Enable the selected SPI interrupt */
    SPIx->CR2 |= itmask;
  }
  else
  {
    /* Disable the selected SPI interrupt */
    SPIx->CR2 &= (uint16_t)~itmask;
  }
}

/**
  * @brief  Returns the current SPIx Transmission FIFO filled level.
  * @param  SPIx: where x can be 1 or 2 to select the SPI peripheral.
  * @retval The Transmission FIFO filling state.
  *          - SPI_TransmissionFIFOStatus_Empty: when FIFO is empty
  *          - SPI_TransmissionFIFOStatus_1QuarterFull: if more than 1 quarter-full.
  *          - SPI_TransmissionFIFOStatus_HalfFull: if more than 1 half-full.
  *          - SPI_TransmissionFIFOStatus_Full: when FIFO is full.
  */
uint16_t SPI_GetTransmissionFIFOStatus(SPI_TypeDef* SPIx)
{
  /* Get the SPIx Transmission FIFO level bits */
  return (uint16_t)((SPIx->SR & SPI_SR_FTLVL));
}

/**
  * @brief  Returns the current SPIx Reception FIFO filled level.
  * @param  SPIx: where x can be 1 or 2 to select the SPI peripheral.
  * @retval The Reception FIFO filling state.
  *          - SPI_ReceptionFIFOStatus_Empty: when FIFO is empty
  *          - SPI_ReceptionFIFOStatus_1QuarterFull: if more than 1 quarter-full.
  *          - SPI_ReceptionFIFOStatus_HalfFull: if more than 1 half-full.
  *          - SPI_ReceptionFIFOStatus_Full: when FIFO is full.
  */
uint16_t SPI_GetReceptionFIFOStatus(SPI_TypeDef* SPIx)
{
  /* Get the SPIx Reception FIFO level bits */
  return (uint16_t)((SPIx->SR & SPI_SR_FRLVL));
}

/**
  * @brief  Checks whether the specified SPI flag is set or not.
  * @param  SPIx: where x can be 1 or 2 in SPI mode or 1 in I2S mode to select
  *         the SPI peripheral.
  * @param  SPI_I2S_FLAG: specifies the SPI flag to check.
  *          This parameter can be one of the following values:
  *            @arg SPI_I2S_FLAG_TXE: Transmit buffer empty flag.
  *            @arg SPI_I2S_FLAG_RXNE: Receive buffer not empty flag.
  *            @arg SPI_I2S_FLAG_BSY: Busy flag.
  *            @arg SPI_I2S_FLAG_OVR: Overrun flag.
  *            @arg SPI_FLAG_MODF: Mode Fault flag.
  *            @arg SPI_FLAG_CRCERR: CRC Error flag.
  *            @arg SPI_I2S_FLAG_FRE: TI frame format error flag.
  *            @arg I2S_FLAG_UDR: Underrun Error flag.
  *            @arg I2S_FLAG_CHSIDE: Channel Side flag.
  * @retval The new state of SPI_I2S_FLAG (SET or RESET).
  */
FlagStatus SPI_I2S_GetFlagStatus(SPI_TypeDef* SPIx, uint16_t SPI_I2S_FLAG)
{
  FlagStatus bitstatus = RESET;
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_SPI_I2S_GET_FLAG(SPI_I2S_FLAG));

  /* Check the status of the specified SPI flag */
  if ((SPIx->SR & SPI_I2S_FLAG) != (uint16_t)RESET)
  {
    /* SPI_I2S_FLAG is set */
    bitstatus = SET;
  }
  else
  {
    /* SPI_I2S_FLAG is reset */
    bitstatus = RESET;
  }
  /* Return the SPI_I2S_FLAG status */
  return  bitstatus;
}

/**
  * @brief  Clears the SPIx CRC Error (CRCERR) flag.
  * @param  SPIx: where x can be 1 or 2 to select the SPI peripheral.
  * @param  SPI_I2S_FLAG: specifies the SPI flag to clear.
  *         This function clears only CRCERR flag.
  * @note   OVR (OverRun error) flag is cleared by software sequence: a read
  *         operation to SPI_DR register (SPI_I2S_ReceiveData()) followed by
  *         a read operation to SPI_SR register (SPI_I2S_GetFlagStatus()).
  * @note   MODF (Mode Fault) flag is cleared by software sequence: a read/write
  *         operation to SPI_SR register (SPI_I2S_GetFlagStatus()) followed by
  *         a write operation to SPI_CR1 register (SPI_Cmd() to enable the SPI).
  * @retval None
  */
void SPI_I2S_ClearFlag(SPI_TypeDef* SPIx, uint16_t SPI_I2S_FLAG)
{
  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_SPI_CLEAR_FLAG(SPI_I2S_FLAG));

  /* Clear the selected SPI CRC Error (CRCERR) flag */
  SPIx->SR = (uint16_t)~SPI_I2S_FLAG;
}

/**
  * @brief  Checks whether the specified SPI/I2S interrupt has occurred or not.
  * @param  SPIx: where x can be 1 or 2 in SPI mode or 1 in I2S mode to select
  *         the SPI peripheral.
  * @param  SPI_I2S_IT: specifies the SPI interrupt source to check.
  *          This parameter can be one of the following values:
  *            @arg SPI_I2S_IT_TXE: Transmit buffer empty interrupt.
  *            @arg SPI_I2S_IT_RXNE: Receive buffer not empty interrupt.
  *            @arg SPI_IT_MODF: Mode Fault interrupt.
  *            @arg SPI_I2S_IT_OVR: Overrun interrupt.
  *            @arg I2S_IT_UDR: Underrun interrupt.
  *            @arg SPI_I2S_IT_FRE: Format Error interrupt.
  * @retval The new state of SPI_I2S_IT (SET or RESET).
  */
ITStatus SPI_I2S_GetITStatus(SPI_TypeDef* SPIx, uint8_t SPI_I2S_IT)
{
  ITStatus bitstatus = RESET;
  uint16_t itpos = 0, itmask = 0, enablestatus = 0;

  /* Check the parameters */
  assert_param(IS_SPI_ALL_PERIPH(SPIx));
  assert_param(IS_SPI_I2S_GET_IT(SPI_I2S_IT));

  /* Get the SPI_I2S_IT index */
  itpos = 0x01 << (SPI_I2S_IT & 0x0F);

  /* Get the SPI_I2S_IT IT mask */
  itmask = SPI_I2S_IT >> 4;

  /* Set the IT mask */
  itmask = 0x01 << itmask;

  /* Get the SPI_I2S_IT enable bit status */
  enablestatus = (SPIx->CR2 & itmask) ;

  /* Check the status of the specified SPI interrupt */
  if (((SPIx->SR & itpos) != (uint16_t)RESET) && enablestatus)
  {
    /* SPI_I2S_IT is set */
    bitstatus = SET;
  }
  else
  {
    /* SPI_I2S_IT is reset */
    bitstatus = RESET;
  }
  /* Return the SPI_I2S_IT status */
  return bitstatus;
}

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

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