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#include <reg52.H>
/****************************************************************************
24C08 读写驱动程序 开始
*****************************************************************************/
#include <reg52.H>
#include <stdio.h>
#include <absacc.h>
#define uchar unsigned char
#define uint unsigned int
sbit scl=P3^3; //24c02 SCL
sbit sda=P3^4; //24c02 SDA
uchar x24c02_read(uchar address); //从24c02的地址address中读取一个字节数据
void x24c02_write(uchar address,uchar info);
//向24c02的address地址中写入一字节数据info
void x24c02_init(); //24c02初始化子程序
void delay1(uchar x);
void flash();
void x24c01_init();
void start();
void stop();
void writex(uchar j);
uchar readx();
void clock();
void delay1(uchar x)
{
uint i;
for(i=0;i<x;i++);
}
void flash()
{}
void x24c02_init()
{
scl=1; flash(); sda=1; flash();
}
void start()
{
sda=1; flash(); scl=1; flash(); sda=0; flash(); scl=0; flash();
}
void stop()
{
sda=0; flash(); scl=1; flash(); sda=1; flash();
}
void writex(uchar j)
{
uchar i,temp;
temp=j;
for (i=0;i<8;i++){
temp=temp<<1; scl=0; flash(); sda=CY; flash(); scl=1; flash();
}
scl=0; flash(); sda=1; flash();
}
uchar readx()
{
uchar i,j,k=0;
scl=0; flash(); sda=1;
for (i=0;i<8;i++){
flash(); scl=1; flash();
if (sda==1) j=1;
else j=0;
k=(k<<1)|j; scl=0;
}
flash(); return(k);
}
void clock()
{
uchar i=0;
scl=1; flash();
while ((sda==1)&&(i<255))i++;
scl=0; flash();
}
uchar x24c02_read(uchar address)
{
uchar i;
start(); writex(0xa0);
clock(); writex(address);
clock(); start();
writex(0xa1); clock();
i=readx(); stop();
delay1(10);
return(i);
}
void x24c02_write(uchar address,uchar info)
{
EA=0;
start(); writex(0xa0);
clock(); writex(address);
clock(); writex(info);
clock(); stop();
EA=1;
delay1(50);
}
//====================================================================//
main()
{
signed char sec; //定义数值
x24c02_init(); //初始化24C08
sec=x24c02_read(2);//读出保存的数据赋于sec
//sec=10; //设置使用次数
sec--;
x24c02_write(2,sec); //在24c08 的地址2 中写入数据sec
while(1)
{
if(sec>=1)P2=0XAA; //显示结果
}
}
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