24c02.c

24c02程序的读写,实现数据的存储

#include <reg51.h>
#include <stdio.h>
#include <absacc.h>

#define uint unsigned int
#define uchar unsigned char
#define dport P0

sbit scl=P3^5;  //24c02 SCL
sbit sda=P3^4;  //24c02 SDA
sbit DOG=P1^7;  //狗

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();

uchar i,j;


void delay1(uchar x)
{
   uint i;
   for(i=0;i<x;i++);
   DOG=~DOG;
}


void flash()
{
   uchar u;
   DOG=~DOG;
}


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()
{for(;;)
 {i=10;
 x24c02_init();
 x24c02_write(0,i);
 delay1(50);
 j = x24c02_read(0);
 dport=j;
 }
 }