extern void Delay(unsigned int n)

extern void I2cPortInit(void)

extern void Start(void)

extern void Stop(void)

extern void WriteByte(unsigned char WriteData)

extern unsigned char ReadByte(void)

extern void ReceiveAck(void)

extern void Acknowledge(void)

extern unsigned int ReadWord(unsigned char unit)

extern void ReadWords(unsigned char unit)

extern void WriteWord(unsigned char unit, unsigned int WriteData)