/**
* @brief Clears the I2Cx's pending flags.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @param I2C_FLAG: specifies the flag to clear.
* This parameter can be any combination of the following values:
* @arg I2C_FLAG_SMBALERT: SMBus Alert flag
* @arg I2C_FLAG_TIMEOUT: Timeout or Tlow error flag
* @arg I2C_FLAG_PECERR: PEC error in reception flag
* @arg I2C_FLAG_OVR: Overrun/Underrun flag (Slave mode)
* @arg I2C_FLAG_AF: Acknowledge failure flag
* @arg I2C_FLAG_ARLO: Arbitration lost flag (Master mode)
* @arg I2C_FLAG_BERR: Bus error flag
*
* @note
* - STOPF (STOP detection) is cleared by software sequence: a read operation
* to I2C_SR1 register (I2C_GetFlagStatus()) followed by a write operation
* to I2C_CR1 register (I2C_Cmd() to re-enable the I2C peripheral).
* - ADD10 (10-bit header sent) is cleared by software sequence: a read
* operation to I2C_SR1 (I2C_GetFlagStatus()) followed by writing the
* second byte of the address in DR register.
* - BTF (Byte Transfer Finished) is cleared by software sequence: a read
* operation to I2C_SR1 register (I2C_GetFlagStatus()) followed by a
* read/write to I2C_DR register (I2C_SendData()).
* - ADDR (Address sent) is cleared by software sequence: a read operation to
* I2C_SR1 register (I2C_GetFlagStatus()) followed by a read operation to
* I2C_SR2 register ((void)(I2Cx->SR2)).
* - SB (Start Bit) is cleared software sequence: a read operation to I2C_SR1
* register (I2C_GetFlagStatus()) followed by a write operation to I2C_DR
* register (I2C_SendData()).
* @retval None
*/
void I2C_ClearFlag(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG) {
uint32_t flagpos = 0;
/* Check the parameters */
assert_param(IS_I2C_ALL_PERIPH(I2Cx));
assert_param(IS_I2C_CLEAR_FLAG(I2C_FLAG));
/* Get the I2C flag position */
flagpos = I2C_FLAG & FLAG_Mask;
/* Clear the selected I2C flag */
I2Cx->SR1 = (uint16_t)~flagpos;
}
/*******************************************************************************
* Function Name : I2C_ClearFlag
* Description : Clears the I2Cx's pending flags.
* Input : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* - I2C_FLAG: specifies the flag to clear.
* This parameter can be one of the following values:
* - I2C_FLAG_SMBALERT: SMBus Alert flag
* - I2C_FLAG_TIMEOUT: Timeout or Tlow error flag
* - I2C_FLAG_PECERR: PEC error in reception flag
* - I2C_FLAG_OVR: Overrun/Underrun flag (Slave mode)
* - I2C_FLAG_AF: Acknowledge failure flag
* - I2C_FLAG_ARLO: Arbitration lost flag (Master mode)
* - I2C_FLAG_BERR: Bus error flag
* - I2C_FLAG_STOPF: Stop detection flag (Slave mode)
* - I2C_FLAG_ADD10: 10-bit header sent flag (Master mode)
* - I2C_FLAG_BTF: Byte transfer finished flag
* - I2C_FLAG_ADDR: Address sent flag (Master mode) “ADSL”
* Address matched flag (Slave mode)”ENDAD”
* - I2C_FLAG_SB: Start bit flag (Master mode)
* Output : None
* Return : None
*******************************************************************************/
void I2C_ClearFlag(I2C_TypeDef* I2Cx, u32 I2C_FLAG)
{
u32 flagpos = 0;
u32 flagindex = 0;
/* Check the parameters */
assert_param(IS_I2C_ALL_PERIPH(I2Cx));
assert_param(IS_I2C_CLEAR_FLAG(I2C_FLAG));
/* Get the I2C flag position */
flagpos = I2C_FLAG & FLAG_Mask;
/* Get the I2C flag index */
flagindex = I2C_FLAG >> 28;
/* Clear the flag by writing 0 */
if (flagindex == 1)
{
/* Clear the selected I2C flag */
I2Cx->SR1 = (u16)~flagpos;
}
/* Flags that need a read of the SR1 register to be cleared */
else if (flagindex == 2)
{
/* Read the SR1 register */
(void)I2Cx->SR1;
}
/* Flags that need a read of SR1 and a write on CR1 registers to be cleared */
else if (flagindex == 6)
{
/* Read the SR1 register */
(void)I2Cx->SR1;
/* Write on the CR1 register */
I2Cx->CR1 |= CR1_PE_Set;
}
/* Flags that need a read of SR1 and SR2 registers to be cleared */
else /*flagindex == 0xA*/
{
/* Read the SR1 register */
(void)I2Cx->SR1;
/* Read the SR2 register */
(void)I2Cx->SR2;
}
}