24C256全能读写头文件.doc

/*51单片机 IIC模拟方式24C256 I2C读写头文件本文件提供了连续读写的函数经过测试完全可以正常*/#ifndef _iic_h#define _iic_h#include#define uchar unsigned char#define uint unsigned int#define NOP _nop_()sbit SDA=P15;/;模拟I2C 数据 sbit SCL=P14;/;模拟I2C 时钟 void delay() NOP;NOP;NOP; void delay1(uint n) unsigned char a,b;while(-n)for(b=102;b0;b-) for(a=3;a0;a-); void star() SDA=1; SCL=1; delay();SDA=0;delay();SCL=0; void stop() SDA=0; SCL=1; delay();SDA=1; delay();SCL=0; /SDA=0; void ack() SDA=0;SCL=1;delay();SCL=0;SDA=1; void nack() SDA=1; SCL=1; delay();SCL=0; SDA=0; void Write8Bit(uchar wchar)uchar temp; for(temp=0;temp8;temp+) SDA=(bit)(wchar&0x80); SCL=1; delay();SCL=0; wchar=wchar1; uchar Read8Bit() uchar temp;uchar rbyte=0; for(temp=0;temp8;temp+) SDA=1; delay();SCL=1; delay();rbyte=rbyte|(unsigned char)(SDA); if(temp7) rbyte=1; delay(); SCL=0; delay();delay();return(rbyte); void WriteByte(uchar Wbcontert,uint Address) star();Write8Bit(0xA0);ack(); Write8Bit(Address/256);ack(); Write8Bit(Address%256); ack(); Write8Bit(Wbcontert); ack(); stop();delay1(10); void WritePage(uchar *Wbcontert,uint AD,uchar n)uchar i; star();/开始 Write8Bit(0xA0);ack(); Write8Bit(AD/256);ack(); Write8Bit(AD%256); ack();for(i=0;in;i+)Write8Bit(*Wbcontert+); ack(); stop();delay1(10); void Write(uchar *Wdata,uint AD,uint n)uint conter,i;uchar last;conter=n/64;for(i=0;i0) WritePage(Wdata,AD,last);delay1(10);uchar ReadByte(uint address) uchar ch;star();Write8Bit(0xA0);ack(); Write8Bit(address/256);ack(); Write8Bit(address%256); ack(); star();Write8Bit(0xA1);ack();ch=Read8Bit();nack();stop();return ch;void ReadPage(uchar *Rdata,uint AD,uchar n) uchar i; star();Write8Bit(0xA0);ack(); Write8Bit(AD/256);ack(); Write8Bit(AD%256); ack(); star();Write8Bit(0xA1);ack();for(i=0;in-1;i+)*Rdata+=Read8Bit(); ack(); *Rdata+=Read8Bit(); nack();stop(); void Read(uchar *Rdata