C51 COMPILER V7.06   24C02                                                                 04/27/2020 09:48:59 PAGE 1   


C51 COMPILER V7.06, COMPILATION OF MODULE 24C02
OBJECT MODULE PLACED IN 24c02.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE 24c02.c BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          //试验AT24C02EEPROM芯片程序
   2          #include <config.h>
   3          uchar sec;                                                                              //定义计数值，每过1秒，sec加1
   4          uint tcnt;                                                                              //定时中断次数
   5          bit  write=0;                                                                   //写24C08的标志；
   6          void delay_24c(uchar i)                                                         //延时程序
   7          {
   8   1              uchar j,k;
   9   1              for(j=i;j>0;j--)
  10   1              for(k=125;k>0;k--);
  11   1      }
  12          void display_24c(uchar bai_c,uchar sh_c)                        //显示程序
  13          {
  14   1         dula=0;
  15   1         P0=seg_table[bai_c];                                                         //显示百位
  16   1         dula=1;
  17   1         dula=0;
  18   1         wela=0;
  19   1         P0=0x7e;
  20   1         wela=1;
  21   1         wela=0;
  22   1         delay_24c(5);
  23   1      
  24   1         dula=0;
  25   1         P0=seg_table[sh_c];                                                          //显示十位
  26   1         dula=1;
  27   1         dula=0;
  28   1         wela=0;
  29   1         P0=0x7d;
  30   1         wela=1;
  31   1         wela=0;
  32   1         delay_24c(5);
  33   1      
  34   1      }
  35          
  36          /********************************24C08读写驱动程序************************************/
  37          void delay3_24c(unsigned char x)
  38          { 
  39   1              uint i;
  40   1              for(i=0;i<x;i++);
  41   1      }
  42          void flash()
  43          {  
  44   1              ;  
  45   1              ; 
  46   1      }
  47          
  48          void x24c08_init()                                                              //24c08初始化子程序
  49          {
  50   1              scl=1; 
  51   1              flash(); 
  52   1              sda=1; 
  53   1              flash();
  54   1      }
  55          void start_24c()                                                                //启动I2C总线
C51 COMPILER V7.06   24C02                                                                 04/27/2020 09:48:59 PAGE 2   

  56          {
  57   1              sda=1; 
  58   1              flash(); 
  59   1              scl=1; 
  60   1              flash(); 
  61   1              sda=0; 
  62   1              flash(); 
  63   1              scl=0; 
  64   1              flash();
  65   1      }
  66          
  67          void stop()                                                                     //停止I2C总线
  68          {
  69   1              sda=0; 
  70   1              flash(); 
  71   1              scl=1; 
  72   1              flash(); 
  73   1              sda=1; 
  74   1              flash();
  75   1      }
  76          
  77          void writex(uchar j)                                                            //写一个字节
  78          {  
  79   1              uchar i,temp;
  80   1              temp=j;
  81   1              for (i=0;i<8;i++)
  82   1              {
  83   2                      temp=temp<<1; 
  84   2                      scl=0; 
  85   2                      flash(); 
  86   2                      sda=CY; 
  87   2                      flash(); 
  88   2                      scl=1; 
  89   2                      flash();
  90   2              }
  91   1              scl=0; 
  92   1              flash(); 
  93   1              sda=1; 
  94   1              flash();
  95   1      }
  96          
  97          uchar readx()                                                                           //读一个字节
  98          {
  99   1         uchar i,j,k=0;
 100   1         scl=0; flash(); sda=1;
 101   1         for (i=0;i<8;i++)
 102   1         {  
 103   2                      flash(); scl=1; flash();
 104   2              if (sda==1) j=1;
 105   2                      else j=0;
 106   2              k=(k<<1)|j;
 107   2                      scl=0;
 108   2              }
 109   1         flash(); 
 110   1         return(k);
 111   1      }
 112          void clock()                                                                    //I2C总线时钟
 113          {
 114   1              unsigned char i=0;
 115   1              scl=1; flash();
 116   1              while ((sda==1)&&(i<255))i++;
 117   1              scl=0; flash();
C51 COMPILER V7.06   24C02                                                                 04/27/2020 09:48:59 PAGE 3   

 118   1      }
 119          //从24c02的地址address中读取一个字节数据
 120          uchar x24c08_read(uchar address)
 121          {
 122   1              uchar i;
 123   1              start_24c(); writex(0xa0);
 124   1              clock(); writex(address);
 125   1              clock(); start_24c();
 126   1              writex(0xa1); clock();
 127   1              i=readx(); stop();
 128   1              delay3_24c(10);
 129   1              return(i);
 130   1      }
 131          //向24c02的address地址中写入一字节数据info
 132          void x24c08_write(uchar address,uchar info)
 133          {
 134   1              EA=0;
 135   1              start_24c(); writex(0xa0);
 136   1              clock(); writex(address);
 137   1              clock(); writex(info);
 138   1              clock(); stop();
 139   1              EA=1;
 140   1              delay3_24c(50);
 141   1      }
 142          
 143          void at24c02_main()
 144          {
 145   1              uchar i;
 146   1              system_init();
 147   1              x24c08_init();                                          //初始化24C08
 148   1              sec=x24c08_read(2);                                             //读出保存的数据赋于sec
 149   1              while(message=='8')
 150   1              {
 151   2                  if(sec==100) sec=0;                                 //定时100秒，在从零开始计时    
 152   2                      write=1;                                                        //1秒写一次24C08
 153   2                      sec++;
 154   2                      i=255;
 155   2              while(i--)
 156   2              {                          
 157   3                              display_24c(sec/10,sec%10);
 158   3              }
 159   2                      if(write==1)                                            //判断计时器是否计时一秒
 160   2              {
 161   3                              write=0;                                //清零
 162   3                      x24c08_write(2,sec);                    //在24c08的地址2中写入数据sec
 163   3              }
 164   2      
 165   2              } 
 166   1          P0=0xff;
 167   1              wela=1;
 168   1              wela=0;
 169   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    379    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =      3    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =      1    ----
C51 COMPILER V7.06   24C02                                                                 04/27/2020 09:48:59 PAGE 4   

END OF MODULE INFORMATION.


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