#include "reg51.h"
#define uchar unsigned char
sbit sda=P2^0;
sbit scl=P2^1;
void delay() //延时
{ ; ; }
void delayms(unsigned int z)
{
unsigned int x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void start() //开始
{
sda=1;
delay();
scl=1;
delay();
sda=0;
delay();
}
void stop() //停止
{
sda=0;
delay();
scl=1;
delay();
sda=1;
delay();
}
void respons() //应答
{
uchar i=0;
scl=1;
delay();
while((sda==1)&&(i<250))
i++;
scl=0;
delay();
}
void init() //初始化
{
sda=1;
delay();
scl=1;
delay();
}
void write_byte(uchar date) //写一个字节
{
uchar i,temp;
temp=date;
for(i=0;i<8;i++)
{
temp=temp<<1;
scl=0;
delay();
sda=CY;
delay();
scl=1;
delay();
scl=0;
delay();
}
sda=0;
delay();
sda=1;
delay();
}
uchar read_byte() //读一个字节
{
uchar i,j,k;
scl=0;
delay();
sda=1;
delay();
for(i=0;i<8;i++)
{
scl=1;
delay();
j=sda;
k=(k<<1)|j;
scl=0;
delay();
}
return k;
}
void write_add(uchar address,uchar date) //写 地址，数据
{
start(); //器件地址
write_byte(0xa0);
respons();
write_byte(address); //数据地址
respons();
write_byte(date); //数据
respons();
stop();
}
uchar read_add(uchar address) //读 （地址）
{
uchar date;
start();
write_byte(0xa0); //器件地址
respons();
write_byte(address); //数据地址
respons();
start(); //表示读
write_byte(0xa1);
respons();
date=read_byte();
stop();
return date;
}
void main()
{
init();
write_add(0,0xfd);
delayms(100);
P1=read_add(1);
while(1);
}
