#include <AT89X52.H>
#include <stdio.h>
#include <absacc.h>
unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,
0x6d,0x7d,0x07, 0x7f,0x6f,};
unsigned char sec; //定义计数值，每过1秒，sec加1
unsigned int tcnt; //定时中断次数
bit write=0; //写24C08的标志；
sbit gewei=P2^0; //个位选通定义
sbit shiwei=P2^1; //十位选通定义
/////////24C08读写驱动程序////////////////////
sbit scl=P3^4; //24c08 SCL
sbit sda=P3^5; //24c08 SDA
void delay1(unsigned char x)
{ unsigned int i;
for(i=0;i<x;i++);
;}
void flash()
{ ; ; }
void x24c08_init() //24c08初始化子程序
{scl=1; flash(); sda=1; flash();}
void start() //启动I2C总线
{sda=1; flash(); scl=1; flash(); sda=0; flash(); scl=0; flash();}
void stop() //停止I2C总线
{sda=0; flash(); scl=1; flash(); sda=1; flash();}
void writex(unsigned char j) //写一个字节
{ unsigned char 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();
}
unsigned char readx() //读一个字节
{
unsigned char 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() //I2C总线时钟
{
unsigned char i=0;
scl=1; flash();
while ((sda==1)&&(i<255))i++;
scl=0; flash();
}
////////从24c02的地址address中读取一个字节数据/////
unsigned char x24c08_read(unsigned char address)
{
unsigned char i;
start(); writex(0xa0);
clock(); writex(address);
clock(); start();
writex(0xa1); clock();
i=readx(); stop();
delay1(10);
return(i);
}
//////向24c02的address地址中写入一字节数据info/////
void x24c08_write(unsigned char address,unsigned char info)
{
EA=0;
start(); writex(0xa0);
clock(); writex(address);
clock(); writex(info);
clock(); stop();
EA=1;
delay1(50);
}
/////////////24C08读写驱动程序完/////////////////////
void Delay(unsigned int tc) //延时程序
{
while( tc != 0 )
{unsigned int i;
for(i=0; i<100; i++);
tc--;}
}
void LED() //LED显示函数
{
shiwei=0; P0=table[sec/10]; Delay(8); shiwei=1;
gewei=0; P0=table[sec%10]; Delay(5); gewei=1;
}
void t0(void) interrupt 1 using 0 //定时中断服务函数
{
TH0=(65536-50000)/256; //对TH0 TL0赋值
TL0=(65536-50000)%256; //重装计数初值
tcnt++; //每过250ust tcnt加一
if(tcnt==20) //计满20次（1秒）时
{
tcnt=0; //重新再计
sec++;
write=1; //1秒写一次24C08
if(sec==100) //定时100秒，在从零开始计时
{sec=0;}
}
}
void main(void)
{
TMOD=0x01; //定时器工作在方式1
ET0=1; EA=1;
x24c08_init(); //初始化24C08
sec=x24c08_read(2);//读出保存的数据赋于sec
TH0=(65536-50000)/256; //对TH0 TL0赋值
TL0=(65536-50000)%256; //使定时器0.05秒中断一次
TR0=1; //开始计时
while(1)
{
LED();
if(write==1) //判断计时器是否计时一秒
{
write=0; //清零
x24c08_write(2,sec); //在24c08的地址2中写入数据sec
}
}
}
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