2402.c

24c02的c语言源代码

#include <reg52.h>
#include <intrins.h>
#include <stdio.h>
#include <absacc.h>
sbit scl=P0^3;  //24c02 SCL
sbit sda=P0^4;  //24c02 SDA
unsigned char x24c02_read(unsigned char address);  //从24c02的地址address中读取一个字节数据
void x24c02_write(unsigned char address,unsigned char 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(unsigned char x);
void flash();		  //短延时			
//void x24c01_init();
void start();		//起始条件	
void stop();		//停止条件	
void writex(unsigned char j);//向总线发送1个数据
unsigned char readx();				//从总线接收1 个数据
void clock();						//应答位
/*void delay1(unsigned char x)
{
   unsigned int i;
   for(i=0;i<x;i++);
   DOG=~DOG;
}*/
//延时
void mDelay(unsigned int DelayTime)
{
	unsigned int j;
	for(;DelayTime>0;DelayTime--)
	{
		for(j=0;j<125;j++)
		{;}
	}
}
void flash()
{
   _nop_();_nop_();
}
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(unsigned char j)
{
   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()
{
   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()
{
   unsigned char i=0;
   scl=1; flash();
   while ((sda==1)&&(i<255))i++;
   scl=0;
   flash();
}
unsigned char x24c02_read(unsigned char address)
{
   unsigned char i;
   start(); writex(0xa0);
   clock(); writex(address);
   clock(); start();
   writex(0xa1); clock();
   i=readx(); stop();
   mDelay(10);
   return(i);
}
void x24c02_write(unsigned char address,unsigned char info)
{
   EA=0;
   start(); writex(0xa0);
   clock(); writex(address);
   clock(); writex(info);
   clock(); stop();
   EA=1;
   mDelay(10);
} 
void main()
{
	unsigned char i,j;
	x24c02_init();
	mDelay(100);
	x24c02_write(0x00,0x55);
	mDelay(100);
	i=x24c02_read(0x00);
	mDelay(100);
	x24c02_write(0x01,0xaa);
	mDelay(100);
	j=x24c02_read(0x01);
	mDelay(100);
}