/*******************************************************************************
* Function Name : SPI_I2S_ClearITPendingBit
* Description : Clears the SPIx/I2Sx interrupt pending bits.
* Input : - SPIx: where x can be :
* - 1, 2 or 3 in SPI mode
* - 2 or 3 in I2S mode
* - SPI_I2S_IT: specifies the SPI/I2S interrupt pending bit to clear.
* This parameter can be one of the following values:
* - SPI_I2S_IT_OVR: Overrun interrupt.
* - SPI_IT_MODF: Mode Fault interrupt.
* - SPI_IT_CRCERR: CRC Error interrupt.
* - I2S_IT_UDR: Underrun Error interrupt.
* Output : None
* Return : None
*******************************************************************************/
void SPI_I2S_ClearITPendingBit(SPI_TypeDef* SPIx, u8 SPI_I2S_IT)
{
u16 itpos = 0;
/* Check the parameters */
assert_param(IS_SPI_ALL_PERIPH(SPIx));
assert_param(IS_SPI_I2S_CLEAR_IT(SPI_I2S_IT));
/* SPI_IT_MODF pending bit clear */
if(SPI_I2S_IT == SPI_IT_MODF)
{
/* Read SR register */
(void)SPIx->SR;
/* Write on CR1 register */
SPIx->CR1 |= CR1_SPE_Set;
}
/* SPI_I2S_IT_OVR or I2S_IT_UDR pending bit clear */
else if((SPI_I2S_IT == SPI_I2S_IT_OVR) || (SPI_I2S_IT == I2S_IT_UDR))
{
/* Read SR register */
(void)(SPIx->SR);
}
else /* SPI_IT_CRCERR pending bit clear */
{
/* Get the SPI/I2S IT index */
itpos = (u16)((u16)0x01 << (SPI_I2S_IT & (u8)0x0F));
/* Clear the selected SPI/I2S interrupt pending bits */
SPIx->SR = (u16)~itpos;
}
}
/**
* @brief Clears the SPIx CRC Error (CRCERR) interrupt pending bit.
* @param SPIx: where x can be :
* 1, 2 or 3 in SPI mode
* @param SPI_I2S_IT: specifies the SPI interrupt pending bit to clear.
* This function clears only CRCERR intetrrupt pending bit.
* @note
* - OVR (OverRun Error) interrupt pending bit 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_GetITStatus()).
* - UDR (UnderRun Error) interrupt pending bit is cleared by a read
* operation to SPI_SR register (SPI_I2S_GetITStatus()).
* - MODF (Mode Fault) interrupt pending bit is cleared by software sequence:
* a read/write operation to SPI_SR register (SPI_I2S_GetITStatus())
* followed by a write operation to SPI_CR1 register (SPI_Cmd() to enable
* the SPI).
* @retval : None
*/
void SPI_I2S_ClearITPendingBit(SPI_TypeDef* SPIx, uint8_t SPI_I2S_IT)
{
uint16_t itpos = 0;
/* Check the parameters */
assert_param(IS_SPI_ALL_PERIPH(SPIx));
assert_param(IS_SPI_I2S_CLEAR_IT(SPI_I2S_IT));
/* Get the SPI IT index */
itpos = (uint16_t)((uint16_t)0x01 << (SPI_I2S_IT & (uint8_t)0x0F));
/* Clear the selected SPI CRC Error (CRCERR) interrupt pending bit */
SPIx->SR = (uint16_t)~itpos;
}
/*******************************************************************************
* 函数名称: SPI_I2S_ClearITPendingBit
* 功能描述: 清除某个SPI CRC错误(CRCERR)中断挂起位.
* 输入参数: (1)- SPIx: x可以是 :
* - 1, 2 或 3 在 SPI 模式
* (2) SPI_I2S_IT:清除指定的中断挂起位。
* 这个函数只清除CRCERR中断挂起位。
* Notes:
* - 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_ClearITPendingBit(SPI_TypeDef* SPIx, u8 SPI_I2S_IT)
{
u16 itpos = 0;
/* Check the parameters [检查参数]*/
assert_param(IS_SPI_ALL_PERIPH(SPIx));
assert_param(IS_SPI_I2S_CLEAR_IT(SPI_I2S_IT));
/* Get the SPI IT index [取得SPI IT向量]*/
itpos = (u16)((u16)0x01 << (SPI_I2S_IT & (u8)0x0F));
/* Clear the selected SPI CRC Error (CRCERR) interrupt pending bit [清除选择的SPI CRC错误中断挂起标志]*/
SPIx->SR = (u16)~itpos;
}
