• 1.void I2C_DeInit(I2C_TypeDef* I2Cx);
• 2.void I2C_Init(I2C_TypeDef* I2Cx, I2C_InitTypeDef* I2C_InitStruct);
• 3.void I2C_StructInit(I2C_InitTypeDef* I2C_InitStruct);
• 4.void I2C_Cmd(I2C_TypeDef* I2Cx, FunctionalState NewState);
• 5.void I2C_DMACmd(I2C_TypeDef* I2Cx, FunctionalState NewState);
• 6.void I2C_DMALastTransferCmd(I2C_TypeDef* I2Cx, FunctionalState NewState);
• 7.void I2C_GenerateSTART(I2C_TypeDef* I2Cx, FunctionalState NewState);
  生成起始条件
• 8.void I2C_GenerateSTOP(I2C_TypeDef* I2Cx, FunctionalState NewState);
  生产终止条件
• 9.void I2C_AcknowledgeConfig(I2C_TypeDef* I2Cx, FunctionalState NewState);
  应答使能,配置收到一个字节后，是否给从机应答，ACK为1，给从机应答，ACK为0，不给从机应答
• 10.void I2C_OwnAddress2Config(I2C_TypeDef* I2Cx, uint8_t Address);
• 11.void I2C_DualAddressCmd(I2C_TypeDef* I2Cx, FunctionalState NewState);
• 12.void I2C_GeneralCallCmd(I2C_TypeDef* I2Cx, FunctionalState NewState);
• 13.void I2C_ITConfig(I2C_TypeDef* I2Cx, uint16_t I2C_IT, FunctionalState NewState);
• 14.void I2C_SendData(I2C_TypeDef* I2Cx, uint8_t Data);
  发送数据，即写数据到数据寄存器DR
• 15.uint8_t I2C_ReceiveData(I2C_TypeDef* I2Cx);
  读取DR数据，作为返回值
• 16.void I2C_Send7bitAddress(I2C_TypeDef* I2Cx, uint8_t Address, uint8_t I2C_Direction);
  发送7位地址的专用函数
• 17.uint16_t I2C_ReadRegister(I2C_TypeDef* I2Cx, uint8_t I2C_Register);
• 18.void I2C_SoftwareResetCmd(I2C_TypeDef* I2Cx, FunctionalState NewState);
• 19.void I2C_NACKPositionConfig(I2C_TypeDef* I2Cx, uint16_t I2C_NACKPosition);
• 20.void I2C_SMBusAlertConfig(I2C_TypeDef* I2Cx, uint16_t I2C_SMBusAlert);
• 21.void I2C_TransmitPEC(I2C_TypeDef* I2Cx, FunctionalState NewState);
• 22.void I2C_PECPositionConfig(I2C_TypeDef* I2Cx, uint16_t I2C_PECPosition);
• 23.void I2C_CalculatePEC(I2C_TypeDef* I2Cx, FunctionalState NewState);
• 24.uint8_t I2C_GetPEC(I2C_TypeDef* I2Cx);
• 25.void I2C_ARPCmd(I2C_TypeDef* I2Cx, FunctionalState NewState);
• 26.void I2C_StretchClockCmd(I2C_TypeDef* I2Cx, FunctionalState NewState);
• 27.void I2C_FastModeDutyCycleConfig(I2C_TypeDef* I2Cx, uint16_t I2C_DutyCycle);

• FlagStatus I2C_GetFlagStatus(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG);
  读取标志位
• void I2C_ClearFlag(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG);
  清除标志位
• ITStatus I2C_GetITStatus(I2C_TypeDef* I2Cx, uint32_t I2C_IT);
  读取中断标志位
• void I2C_ClearITPendingBit(I2C_TypeDef* I2Cx, uint32_t I2C_IT);
  清除中断标志位