/*******************************************************************************
* Function Name : SPI_ClearFlag
* Description : Clears the SPIx's pending flags.
* Input : - SPIx: where x can be 1 or 2 to select the SPI peripheral.
* - SPI_FLAG: specifies the flag to clear.
* This parameter can be any combination of the following values:
* - SPI_FLAG_OVR: Overrun flag.
* - SPI_FLAG_MODF: Mode Fault flag.
* - SPI_FLAG_CRCERR: CRC Error flag.
* Output : None
* Return : None
*******************************************************************************/
void SPI_ClearFlag(SPI_TypeDef* SPIx, u16 SPI_FLAG)
{
/* Check the parameters */
assert(IS_SPI_CLEAR_FLAG(SPI_FLAG));
/* SPI_FLAG_MODF flag clear */
if(SPI_FLAG == SPI_FLAG_MODF)
{
/* Read SR register */
(void)SPIx->SR;
/* Write on CR1 register */
SPIx->CR1 |= CR1_SPE_Set;
}
/* SPI_FLAG_OVR flag clear */
else if(SPI_FLAG == SPI_FLAG_OVR)
{
/* Read SR register */
(void)SPIx->SR;
}
else /* SPI_FLAG_CRCERR flag clear */
{
/* Clear the selected SPI flag */
SPIx->SR &= (u16)~SPI_FLAG;
}
}
/**
* @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;
}