// extern void DelayMs(unsigned int);// extern void Read24c02(unsigned char *RamAddress,unsigned char RomAddress,unsigned char bytes);// extern void Write24c02(unsigned char *RamAddress,unsigned char RomAddress,unsigned char bytes);/***************************************************************************/#include <reg51.h>#define	WriteDeviceAddress 0xa0#define	ReadDviceAddress 0xa1/***************************************************************************/sbit	SCL=P3^7;sbit	SDA=P3^6;/***************************************************************************/void DelayMs(unsigned int number) {	unsigned char temp;	for(;number;number--) {		for(temp=112;temp!=0;temp--) {		}	}}/***************************************************************************/void Start() {	SDA=1;	SCL=1;	SDA=0;	SCL=0;}/***************************************************************************/void Stop() {	SCL=0;	SDA=0;	SCL=1;	SDA=1;}/***************************************************************************/void Ack() {	SDA=0;	SCL=1;	SCL=0;	SDA=1;}/***************************************************************************/void NoAck() {	SDA=1;	SCL=1;	SCL=0;}/***************************************************************************/bit TestAck() {	bit ErrorBit;	SDA=1;	SCL=1;	ErrorBit=SDA;	SCL=0;	return(ErrorBit);}/***************************************************************************/bit Write8Bit(unsigned char input) {	unsigned char temp;	for(temp=8;temp!=0;temp--) {		SDA=(bit)(input&0x80);		SCL=1;		SCL=0;		input=input<<1;	}}/***************************************************************************/void Write24c02(unsigned char *Wdata,unsigned char RomAddress,unsigned char number) {	Start();	Write8Bit(WriteDeviceAddress);	TestAck();	Write8Bit(RomAddress);	TestAck();	for(;number!=0;number--) {		Write8Bit(*Wdata);		TestAck();		Wdata++;	}	Stop();	DelayMs(10);}/***************************************************************************/unsigned char 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);}/***************************************************************************/void Read24c02(unsigned char *RamAddress,unsigned char RomAddress,unsigned char bytes) {	Start();	Write8Bit(WriteDeviceAddress);	TestAck();	Write8Bit(RomAddress);	TestAck();	Start();	Write8Bit(ReadDviceAddress);	TestAck();	while(bytes!=1) {	*RamAddress=Read8Bit();	Ack();	RamAddress++;	bytes--;	}	*RamAddress=Read8Bit();	NoAck();	Stop();}/***************************************************************************/void main(void){	Byte buf1[]={3,4,5,6,7,8};	Byte buf2[];	Write24c02(buf1,0,6);	Read24c02(buf2,0,6);	if(buf1[1]==buf2[1])LED1=0;	if(buf1[2]==buf2[2])LED2=0;	if(buf1[3]==buf2[3])LED3=0;	if(buf1[4]==buf2[4])LED4=0;	while(1);}