at24c02.lst

基于51的AT24C02EEPROM芯片程序

C51 COMPILER V7.50   AT24C02                                                               12/16/2007 13:47:07 PAGE 1   


C51 COMPILER V7.50, COMPILATION OF MODULE AT24C02
OBJECT MODULE PLACED IN AT24C02.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE AT24C02.C BROWSE DEBUG OBJECTEXTEND

line level    source

   1          
   2          /******************************************************************
   3          /*                                                                *
   4          /* AOKE210E单片机开发系统演示程序                                                             *
   5          /*                                                                *
   6          /* 版本： V2.0 (2007/11/20)                                       *
   7          /* 作者： 高山流水 (Email: [e-mail])                      *
   8          /* 网站： www.aokemcu.cn(奥科电子)                                *
   9          /*                                                                *
  10          /*                                                                *
  11          /******************************************************************/
  12          
  13          //试验AT24C02EEPROM芯片程序
  14          #include<reg51.h>
  15          #include <intrins.h>
  16          #define uint unsigned int
  17          #define uchar unsigned char
  18          unsigned char sec;        //定义计数值，每过1秒，sec加1
  19          unsigned int tcnt;        //定时中断次数
  20          bit  write=0;             //写24C08的标志；
  21          sbit sda=P1^4;                          //IO口定义
  22          sbit scl=P1^3;
  23          sbit dula=P2^2;
  24          sbit wela=P2^3;
  25          unsigned char j,k;
  26          void delay(unsigned char i)             //延时程序
  27          {
  28   1        for(j=i;j>0;j--)
  29   1          for(k=125;k>0;k--);
  30   1      }
  31          uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,                         //数码管编码
  32                                  0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
  33          void display(uchar bai_c,uchar sh_c)                    //显示程序
  34          {
  35   1         dula=0;
  36   1         P0=table[bai_c];             //显示百位
  37   1         dula=1;
  38   1         dula=0;
  39   1      
  40   1         wela=0;
  41   1         P0=0xfe;
  42   1         wela=1;
  43   1         wela=0;
  44   1         delay(5);
  45   1      
  46   1         dula=0;
  47   1         P0=table[sh_c];              //显示十位
  48   1         dula=1;
  49   1         dula=0;
  50   1      
  51   1         wela=0;
  52   1         P0=0xfd;
  53   1         wela=1;
  54   1         wela=0;
  55   1         delay(5);
C51 COMPILER V7.50   AT24C02                                                               12/16/2007 13:47:07 PAGE 2   

  56   1      
  57   1      }
  58          
  59          /////////24C08读写驱动程序////////////////////
  60          void delay1(unsigned char x)
  61          {  unsigned int i;
  62   1        for(i=0;i<x;i++);
  63   1        ;}
  64          void flash()
  65          {  ;  ; }
  66          void x24c08_init()  //24c08初始化子程序
  67           {scl=1; flash(); sda=1; flash();}
  68          void start()        //启动I2C总线
  69          {sda=1; flash(); scl=1; flash(); sda=0; flash(); scl=0; flash();}
  70          void stop()         //停止I2C总线
  71          {sda=0; flash(); scl=1; flash(); sda=1; flash();}
  72          void writex(unsigned char j)  //写一个字节
  73          {  unsigned char i,temp;
  74   1         temp=j;
  75   1         for (i=0;i<8;i++)
  76   1         {temp=temp<<1; scl=0; flash(); sda=CY; flash(); scl=1; flash();}
  77   1         scl=0; flash(); sda=1; flash();
  78   1      }
  79          unsigned char readx()   //读一个字节
  80          {
  81   1         unsigned char i,j,k=0;
  82   1         scl=0; flash(); sda=1;
  83   1         for (i=0;i<8;i++)
  84   1         {  flash(); scl=1; flash();
  85   2            if (sda==1) j=1;
  86   2            else j=0;
  87   2            k=(k<<1)|j;
  88   2                scl=0;}
  89   1         flash(); return(k);
  90   1      }
  91          void clock()         //I2C总线时钟
  92          {
  93   1         unsigned char i=0;
  94   1         scl=1; flash();
  95   1         while ((sda==1)&&(i<255))i++;
  96   1         scl=0; flash();
  97   1      }
  98          ////////从24c02的地址address中读取一个字节数据/////
  99          unsigned char x24c08_read(unsigned char address)
 100          {
 101   1         unsigned char i;
 102   1         start(); writex(0xa0);
 103   1         clock(); writex(address);
 104   1         clock(); start();
 105   1         writex(0xa1); clock();
 106   1         i=readx(); stop();
 107   1         delay1(10);
 108   1         return(i);
 109   1      }
 110          //////向24c02的address地址中写入一字节数据info/////
 111          void x24c08_write(unsigned char address,unsigned char info)
 112          {
 113   1         EA=0;
 114   1         start(); writex(0xa0);
 115   1         clock(); writex(address);
 116   1         clock(); writex(info);
 117   1         clock(); stop();
C51 COMPILER V7.50   AT24C02                                                               12/16/2007 13:47:07 PAGE 3   

 118   1         EA=1;
 119   1         delay1(50);
 120   1      }
 121          
 122          void t0(void) interrupt 1 using 0  //定时中断服务函数
 123          {
 124   1      TH0=(65536-50000)/256; //对TH0 TL0赋值
 125   1      TL0=(65536-50000)%256; //重装计数初值
 126   1      tcnt++;        //每过250ust tcnt加一
 127   1      if(tcnt==20)  //计满20次（1秒）时
 128   1        {
 129   2          tcnt=0;   //重新再计
 130   2          sec++;
 131   2          write=1;  //1秒写一次24C08
 132   2          if(sec==100) //定时100秒，在从零开始计时
 133   2            {sec=0;}
 134   2        }
 135   1      }
 136          
 137          void main()
 138          {
 139   1      unsigned char i;
 140   1      TMOD=0x01;  //定时器工作在方式1
 141   1      ET0=1;  EA=1;
 142   1      x24c08_init();        //初始化24C08
 143   1      sec=x24c08_read(2);//读出保存的数据赋于sec
 144   1      TH0=(65536-50000)/256; //对TH0 TL0赋值
 145   1      TL0=(65536-50000)%256; //使定时器0.05秒中断一次
 146   1      TR0=1;           //开始计时
 147   1      P2=0xC0;
 148   1       while(1)
 149   1        {
 150   2            i=10;
 151   2            while(i--)
 152   2            {
 153   3              display(sec/10,sec%10);
 154   3            }
 155   2              if(write==1) //判断计时器是否计时一秒
 156   2             {
 157   3               write=0;              //清零
 158   3                x24c08_write(2,sec);  //在24c08的地址2中写入数据sec
 159   3             }
 160   2         } 
 161   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    419    ----
   CONSTANT SIZE    =     16    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =      5    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =      1    ----
END OF MODULE INFORMATION.


C51 COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)