ST STM32F31xx - Page 269

UM1581
Inter-integrated circuit interface (I2C)
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Parameters
 I2Cx : where x can be 1 or 2 to select the I2C peripheral.
 I2C_FLAG : specifies the flag to check. This parameter can
be one of the following values:
 I2C_FLAG_TXE : Transmit data register empty
 I2C_FLAG_TXIS : Transmit interrupt status
 I2C_FLAG_RXNE : Receive data register not empty
 I2C_FLAG_ADDR : Address matched (slave mode)
 I2C_FLAG_NACKF : NACK received flag
 I2C_FLAG_STOPF : STOP detection flag
 I2C_FLAG_TC : Transfer complete (master mode)
 I2C_FLAG_TCR : Transfer complete reload
 I2C_FLAG_BERR : Bus error
 I2C_FLAG_ARLO : Arbitration lost
 I2C_FLAG_OVR : Overrun/Underrun
 I2C_FLAG_PECERR : PEC error in reception
 I2C_FLAG_TIMEOUT : Timeout or Tlow detection flag
 I2C_FLAG_ALERT : SMBus Alert
 I2C_FLAG_BUSY : Bus busy
Return values
 The new state of I2C_FLAG (SET or RESET).
Notes
 None.
13.2.15.2 I2C_ClearFlag
Function Name
void I2C_ClearFlag ( I2C_TypeDef * I2Cx, uint32_t I2C_FLAG)
Function Description
Clears the I2Cx's pending flags.
Parameters
 I2Cx : where x can be 1 or 2 to select the I2C peripheral.
 I2C_FLAG : specifies the flag to clear. This parameter can
be any combination of the following values:
 I2C_FLAG_ADDR : Address matched (slave mode)
 I2C_FLAG_NACKF : NACK received flag
 I2C_FLAG_STOPF : STOP detection flag
 I2C_FLAG_BERR : Bus error
 I2C_FLAG_ARLO : Arbitration lost
 I2C_FLAG_OVR : Overrun/Underrun
 I2C_FLAG_PECERR : PEC error in reception
 I2C_FLAG_TIMEOUT : Timeout or Tlow detection flag
 I2C_FLAG_ALERT : SMBus Alert
Return values
 The new state of I2C_FLAG (SET or RESET).
Notes
 None.