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UM1581

Inter-integrated circuit interface (I2C)

DocID023800 Rev 1

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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: