AT24C02EEPROM芯片程序
#include<reg51.h>
#include <intrins.h>
#define uint unsigned int
#define uchar unsigned char
unsigned char sec; //定義計數值，每過1秒，sec加1
unsigned int tcnt; //定時中斷次數
bit write=0; //寫24C08的標志；
sbit sda=P2^0; //IO口定義
sbit scl=P2^1;
sbit dula=P2^6;
sbit wela=P2^7;
unsigned char j,k;
void delay(unsigned char i) //延時程序
{
for(j=i;j>0;j--)
for(k=125;k>0;k--);
}
uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d, //數碼管編碼
0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
void display(uchar bai_c,uchar sh_c) //顯示程序
{
dula=0;
P0=table[bai_c]; //顯示百位
dula=1;
dula=0;
wela=0;
P0=0x7e;
wela=1;
wela=0;
delay(5);
dula=0;
P0=table[sh_c]; //顯示十位
dula=1;
dula=0;
wela=0;
P0=0x7d;
wela=1;
wela=0;
delay(5);
}
/////////24C08讀寫驅動程序////////////////////
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() //啟動I2C總線
{sda=1; flash(); scl=1; flash(); sda=0; flash(); scl=0; flash();}
void stop() //停止I2C總線
{sda=0; flash(); scl=1; flash(); sda=1; flash();}
void writex(unsigned char j) //寫一個字節
{ 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() //讀一個字節
{
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總線時鐘
{
unsigned char i=0;
scl=1; flash();
while ((sda==1)&&(i<255))i++;
scl=0; flash();
}
////////從24c02的地址address中讀取一個字節數據/////
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地址中寫入一字節數據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);
}
void t0(void) interrupt 1 using 0 //定時中斷服務函數
{
TH0=(65536-50000)/256; //對TH0 TL0賦值
TL0=(65536-50000)%256; //重裝計數初值
tcnt++; //每過250ust tcnt加一
if(tcnt==20) //計滿20次（1秒）時
{
tcnt=0; //重新再計
sec++;
write=1; //1秒寫一次24C08
if(sec==100) //定時100秒，在從零開始計時
{sec=0;}
}
}
void main()
{
unsigned char i;
TMOD=0x01; //定時器工作在方式1
ET0=1; EA=1;
x24c08_init(); //初始化24C08
sec=x24c08_read(2);//讀出保存的數據賦于sec
TH0=(65536-50000)/256; //對TH0 TL0賦值
TL0=(65536-50000)%256; //使定時器0.05秒中斷一次
TR0=1; //開始計時
while(1)
{
i=10;
while(i--)
{
display(sec/10,sec%10);
}
if(write==1) //判斷計時器是否計時一秒
{
write=0; //清零
x24c08_write(2,sec); //在24c08的地址2中寫入數據sec
}
}
} |
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