#define uchar unsigned char //定義一下方便使用
#define uint  unsigned int
#define ulong unsigned long
#include <reg52.h>     //包括一個52標準內核的頭文件

#define	WriteDeviceAddress 0xa0	  //定義器件在IIC總線中的地址
#define	ReadDviceAddress 0xa1
sbit	SCL=P2^7;
sbit	SDA=P2^6;

sbit 	P10=P1^0;
/*
//定時函數
void DelayMs(unsigned int number) 
{
	unsigned char temp;
	for(;number!=0;number--) 
	{
		for(temp=112;temp!=0;temp--) ;
	}
}
*/
//開始總線
void Start() 
{
	SDA=1;
	SCL=1;
	SDA=0;
	SCL=0;
}

//結束總線
void Stop() 
{
	SCL=0;
	SDA=0;
	SCL=1;
	SDA=1;
}


//發ACK0
void NoAck() 
{
	SDA=1;
	SCL=1;
	SCL=0;
}

//測試ACK
bit TestAck() 
{
	bit ErrorBit;
	SDA=1;
	SCL=1;
	ErrorBit=SDA;
	SCL=0;
	return(ErrorBit);
}

//寫入8個bit到24c02
Write8Bit(unsigned char input) 
{
	unsigned char temp;
	for(temp=8;temp!=0;temp--) 
	{
		SDA=(bit)(input&0x80);
		SCL=1;
		SCL=0;
		input=input<<1;
	}
}
/*
//寫入一個字節到24c02中
void Write24c02(uchar ch,uchar address) 
{
	Start();
	Write8Bit(WriteDeviceAddress);
	TestAck();
	Write8Bit(address);
	TestAck();

	Write8Bit(ch);
	TestAck();
	
	Stop();
	DelayMs(10);
}
 */
//從24c02中讀出8個bit
uchar Read8Bit() 
{
	unsigned char temp,rbyte=0;
	for(temp=8;temp!=0;temp--) 
	{
		SCL=1;
		rbyte=rbyte<<1;
		rbyte=rbyte|((unsigned char)(SDA));
		SCL=0;
	}
	return(rbyte);
}

//從24c02中讀出1個字節
uchar Read24c02(uchar address) 
{
	uchar ch;

	Start();
	Write8Bit(WriteDeviceAddress);
	TestAck();
	Write8Bit(address);
	TestAck();
	Start();
	Write8Bit(ReadDviceAddress);
	TestAck();
	ch=Read8Bit();
	NoAck();
	Stop();
	return(ch);
}