大蝦電子－絕對好用的24c02讀寫程序(清風徐徐)文章編號:1477----加入日期:2004-5-18 
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      絕對好用的24c02讀寫程序(清風徐徐)

        #include <stdio.h>
        #include <absacc.h>
        sbit  led=P1^0;
        sbit  led2=P1^1;
        sbit scl=P3^5;  //24c02 SCL
        sbit sda=P3^4;  //24c02 SDA
        sbit DOG=P1^7;  //狗
        uchar x24c02_read(uchar address);  //從24c02的地址address中讀取一個字節數據
        void x24c02_write(uchar address,uchar info);
          //向24c02的address地址中寫入一字節數據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++);
           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  (){
                                  uchar data a=2,b=10,c=0;
                                     x24c02_init();
                                     x24c02_write(a,b);
                                     delay1(200);
                                     c=x24c02_read(a);

                                     if(c==b)led=0;
                                     led2=0;
                                      
                                     }
        //===================================================================//
        //==========================================================
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