1.lst

51单片机串行口扩展键盘接口仿真 51单片机串行口扩展键盘接口仿真

C51 COMPILER V7.08   1                                                                     06/01/2007 13:43:32 PAGE 1   


C51 COMPILER V7.08, COMPILATION OF MODULE 1
OBJECT MODULE PLACED IN 1.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE 1.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          #include <reg51.h>
   2          
   3          sbit  flag = P3^2;
   4          unsigned char key_code = 10;  
   5           
   6          void delay()    //延时函数；
   7          {
   8   1              unsigned char a,b;        
   9   1              for(a=0;a<20;a++)
  10   1                      for(b=0;b<100;b++);
  11   1                      
  12   1      }
  13          
  14          key() //按键处理函数；
  15          {
  16   1              unsigned char k =0xfe, column = 0;
  17   1              while(1)
  18   1              {
  19   2                      SBUF = k;
  20   2                      while(TI !=1);
  21   2                      TI = 0; 
  22   2                      if(flag != 0)
  23   2                      {       
  24   3                              column++;
  25   3                              if(column >= 8) column = 0;
  26   3                              k = k<<1;
  27   3                              
  28   3                      }       
  29   2                      else
  30   2                      {
  31   3                              key_code = column;
  32   3                              
  33   3                              SBUF = 0x00;
  34   3                              while(TI == 0);
  35   3                              TI = 0;
  36   3                              return(key_code);
  37   3                              break;                                                                  
  38   3                      }               
  39   2          }
  40   1      
  41   1      
  42   1      }
  43          
  44          
  45          
  46          
  47          
  48          main()
  49          {
  50   1              SCON = 0x00;
  51   1              EA = 0;
  52   1              ES = 0;
  53   1              SBUF = 0x00;
  54   1              while(TI !=1);
  55   1              TI = 0;
C51 COMPILER V7.08   1                                                                     06/01/2007 13:43:32 PAGE 2   

  56   1      
  57   1              while(1)
  58   1              {
  59   2                      if(flag == 0)
  60   2                      {
  61   3                              delay();
  62   3                              if(flag == 0) key();
  63   3                      }
  64   2                      
  65   2                      switch(key_code)
  66   2                      {
  67   3                              case 0:
  68   3                                      P1 = 0x01;
  69   3                                      break;
  70   3                              case 1:
  71   3                                      P1 = 0x02;
  72   3                                      break;
  73   3                              case 2:
  74   3                                      P1 = 0x04;
  75   3                                      break;
  76   3                              case 3:
  77   3                                      P1 = 0x08;
  78   3                                      break;
  79   3                              case 4:
  80   3                                      P1 = 0x10;
  81   3                                      break;
  82   3                              case 5:
  83   3                                      P1 = 0x20;
  84   3                                      break;
  85   3                              case 6:
  86   3                                      P1 = 0x40;
  87   3                                      break;
  88   3                              case 7:
  89   3                                      P1 = 0x80;
  90   3                                      break;
  91   3                              default:
  92   3                                      P1 = 0x00;
  93   3                                      break;
  94   3                      }
  95   2              }
  96   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    166    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =      1    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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