at24c02_tx-1b.lst

基于51的AT24C02EEPROM芯片程序

C51 COMPILER V7.50   AT24C02_TX_1B                                                         12/08/2007 12:11:30 PAGE 1   


C51 COMPILER V7.50, COMPILATION OF MODULE AT24C02_TX_1B
OBJECT MODULE PLACED IN AT24C02_TX-1B.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE AT24C02_TX-1B.C BROWSE DEBUG OBJECTEXTEND

line level    source

   1          //试验AT24C02EEPROM芯片程序
   2          #include<reg51.h>
   3          #include <intrins.h>
   4          #define uint unsigned int
   5          #define uchar unsigned char
   6          unsigned char sec;        //定义计数值，每过1秒，sec加1
   7          unsigned int tcnt;        //定时中断次数
   8          bit  write=0;             //写24C08的标志；
   9          sbit sda=P1^4;                          //IO口定义
  10          sbit scl=P1^3;
  11          sbit dula=P2^7;
  12          sbit wela=P2^6;
  13          unsigned char j,k;
  14          void delay(unsigned char i)             //延时程序
  15          {
  16   1        for(j=i;j>0;j--)
  17   1          for(k=125;k>0;k--);
  18   1      }
  19          uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,                         //数码管编码
  20                                  0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
  21          void display(uchar bai_c,uchar sh_c)                    //显示程序
  22          {
  23   1         dula=0;
  24   1         P0=table[bai_c];             //显示百位
  25   1         dula=1;
  26   1         dula=0;
  27   1      
  28   1         wela=0;
  29   1         P0=0xfe;
  30   1         wela=1;
  31   1         wela=0;
  32   1         delay(5);
  33   1      
  34   1         dula=0;
  35   1         P0=table[sh_c];              //显示十位
  36   1         dula=1;
  37   1         dula=0;
  38   1      
  39   1         wela=0;
  40   1         P0=0xfd;
  41   1         wela=1;
  42   1         wela=0;
  43   1         delay(5);
  44   1      
  45   1      }
  46          
  47          /////////24C08读写驱动程序////////////////////
  48          void delay1(unsigned char x)
  49          {  unsigned int i;
  50   1        for(i=0;i<x;i++);
  51   1        ;}
  52          void flash()
  53          {  ;  ; }
  54          void x24c08_init()  //24c08初始化子程序
  55           {scl=1; flash(); sda=1; flash();}
C51 COMPILER V7.50   AT24C02_TX_1B                                                         12/08/2007 12:11:30 PAGE 2   

  56          void start()        //启动I2C总线
  57          {sda=1; flash(); scl=1; flash(); sda=0; flash(); scl=0; flash();}
  58          void stop()         //停止I2C总线
  59          {sda=0; flash(); scl=1; flash(); sda=1; flash();}
  60          void writex(unsigned char j)  //写一个字节
  61          {  unsigned char i,temp;
  62   1         temp=j;
  63   1         for (i=0;i<8;i++)
  64   1         {temp=temp<<1; scl=0; flash(); sda=CY; flash(); scl=1; flash();}
  65   1         scl=0; flash(); sda=1; flash();
  66   1      }
  67          unsigned char readx()   //读一个字节
  68          {
  69   1         unsigned char i,j,k=0;
  70   1         scl=0; flash(); sda=1;
  71   1         for (i=0;i<8;i++)
  72   1         {  flash(); scl=1; flash();
  73   2            if (sda==1) j=1;
  74   2            else j=0;
  75   2            k=(k<<1)|j;
  76   2                scl=0;}
  77   1         flash(); return(k);
  78   1      }
  79          void clock()         //I2C总线时钟
  80          {
  81   1         unsigned char i=0;
  82   1         scl=1; flash();
  83   1         while ((sda==1)&&(i<255))i++;
  84   1         scl=0; flash();
  85   1      }
  86          ////////从24c02的地址address中读取一个字节数据/////
  87          unsigned char x24c08_read(unsigned char address)
  88          {
  89   1         unsigned char i;
  90   1         start(); writex(0xa0);
  91   1         clock(); writex(address);
  92   1         clock(); start();
  93   1         writex(0xa1); clock();
  94   1         i=readx(); stop();
  95   1         delay1(10);
  96   1         return(i);
  97   1      }
  98          //////向24c02的address地址中写入一字节数据info/////
  99          void x24c08_write(unsigned char address,unsigned char info)
 100          {
 101   1         EA=0;
 102   1         start(); writex(0xa0);
 103   1         clock(); writex(address);
 104   1         clock(); writex(info);
 105   1         clock(); stop();
 106   1         EA=1;
 107   1         delay1(50);
 108   1      }
 109          
 110          void t0(void) interrupt 1 using 0  //定时中断服务函数
 111          {
 112   1      TH0=(65536-50000)/256; //对TH0 TL0赋值
 113   1      TL0=(65536-50000)%256; //重装计数初值
 114   1      tcnt++;        //每过250ust tcnt加一
 115   1      if(tcnt==20)  //计满20次（1秒）时
 116   1        {
 117   2          tcnt=0;   //重新再计
C51 COMPILER V7.50   AT24C02_TX_1B                                                         12/08/2007 12:11:30 PAGE 3   

 118   2          sec++;
 119   2          write=1;  //1秒写一次24C08
 120   2          if(sec==100) //定时100秒，在从零开始计时
 121   2            {sec=0;}
 122   2        }
 123   1      }
 124          
 125          void main()
 126          {
 127   1      unsigned char i;
 128   1      TMOD=0x01;  //定时器工作在方式1
 129   1      ET0=1;  EA=1;
 130   1      x24c08_init();        //初始化24C08
 131   1      sec=x24c08_read(2);//读出保存的数据赋于sec
 132   1      TH0=(65536-50000)/256; //对TH0 TL0赋值
 133   1      TL0=(65536-50000)%256; //使定时器0.05秒中断一次
 134   1      TR0=1;           //开始计时
 135   1      P2=0xC0;
 136   1       while(1)
 137   1        {
 138   2            i=10;
 139   2            while(i--)
 140   2            {
 141   3              display(sec/10,sec%10);
 142   3            }
 143   2              if(write==1) //判断计时器是否计时一秒
 144   2             {
 145   3               write=0;              //清零
 146   3                x24c08_write(2,sec);  //在24c08的地址2中写入数据sec
 147   3             }
 148   2         } 
 149   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)