/*******************************************************************************
* Function Name : SPI_I2S_ClearFlag
* Description : Clears the SPIx/I2Sx pending flags.
* Input : - SPIx: where x can be :
* - 1, 2 or 3 in SPI mode
* - 2 or 3 in I2S mode
* - SPI_I2S_FLAG: specifies the SPI/I2S flag to clear.
* This parameter can be one of the following values:
* - SPI_I2S_FLAG_OVR: Overrun flag
* - SPI_FLAG_MODF: Mode Fault flag.
* - SPI_FLAG_CRCERR: CRC Error flag.
* - I2S_FLAG_UDR: Underrun Error flag.
* Note: Before clearing OVR flag, it is mandatory to read
* SPI_I2S_DR register, so that the last data is not lost.
* Output : None
* Return : None
*******************************************************************************/
void SPI_I2S_ClearFlag(SPI_TypeDef* SPIx, u16 SPI_I2S_FLAG)
{
/* Check the parameters */
assert_param(IS_SPI_ALL_PERIPH(SPIx));
assert_param(IS_SPI_I2S_CLEAR_FLAG(SPI_I2S_FLAG));
/* SPI_FLAG_MODF flag clear */
if(SPI_I2S_FLAG == SPI_FLAG_MODF)
{
/* Read SR register */
(void)SPIx->SR;
/* Write on CR1 register */
SPIx->CR1 |= CR1_SPE_Set;
}
/* SPI_I2S_FLAG_OVR flag or I2S_FLAG_UDR flag clear */
else if ((SPI_I2S_FLAG == SPI_I2S_FLAG_OVR) || (SPI_I2S_FLAG == I2S_FLAG_UDR))
{
/* Read SR register (Before clearing OVR flag, it is mandatory to read
SPI_I2S_DR register)*/
(void)SPIx->SR;
}
else /* SPI_FLAG_CRCERR flag clear */
{
/* Clear the selected SPI flag */
SPIx->SR = (u16)~SPI_I2S_FLAG;
}
}
/*******************************************************************************
* 函数名称: SPI_I2S_ClearFlag
* 功能描述: 清除SPIx CRC错误(CRCERR) 标志.
* 输入参数: (1)SPIx: x可以是 :
* - 1, 2 或 3 在 SPI 模式
* (2)SPI_I2S_FLAG: 指定清除的SPI标志.
* 这个函数只能清除CRCERR标志.
* 注意:
* - OVR (过速错误)中断挂起位可以被软件按顺序清除: 一个读
* SPI_DR寄存器操作 (SPI_I2S_ReceiveData()) 跟着一个读
* SPI_SR寄存器操作 (SPI_I2S_GetITStatus()).
* - UDR (空栈读错误) 中断挂起位可以被一个读SPI_SR寄存器操
* 作清除(SPI_I2S_GetITStatus())。
* - MODF (模式错误) 中断挂起位被软件按顺序清除:一个读/写
* SPI_SR寄存器操作(SPI_I2S_GetITStatus())跟着一个写SPI_CR1
* 寄存器操作 (SPI_Cmd() 使能 SPI).
* 输出参数: 无
* 返回参数: 无
*******************************************************************************/
void SPI_I2S_ClearFlag(SPI_TypeDef* SPIx, u16 SPI_I2S_FLAG)
{
/* Check the parameters [检查参数]*/
assert_param(IS_SPI_ALL_PERIPH(SPIx));
assert_param(IS_SPI_I2S_CLEAR_FLAG(SPI_I2S_FLAG));
/* Clear the selected SPI CRC Error (CRCERR) flag [清除选择的SPI CRC错误(CRCERR)标志]*/
SPIx->SR = (u16)~SPI_I2S_FLAG;
}
/**
* @brief Clears the SPIx CRC Error (CRCERR) flag.
* @param SPIx: where x can be :
* 1, 2 or 3 in SPI mode
* @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()).
* - UDR (UnderRun error) flag is cleared by a read operation to
* SPI_SR register (SPI_I2S_GetFlagStatus()).
* - 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_I2S_CLEAR_FLAG(SPI_I2S_FLAG));
/* Clear the selected SPI CRC Error (CRCERR) flag */
SPIx->SR = (uint16_t)~SPI_I2S_FLAG;
}