keybscan.lst

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C51 COMPILER V7.06   KEYBSCAN                                                              05/16/2009 11:06:13 PAGE 1   


C51 COMPILER V7.06, COMPILATION OF MODULE KEYBSCAN
OBJECT MODULE PLACED IN keybscan.OBJ
COMPILER INVOKED BY: D:\keil\C51\BIN\C51.EXE keybscan.c LARGE BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          #include <reg51.h>
   2          #include <stdarg.h>
   3          #include <stdio.h>
   4          #include <math.h>
   5          
   6          #define ulong unsigned long
   7          #define uint unsigned int
   8          #define uchar unsigned char
   9          /*********************************************************************
  10          **** Keyboard Scanner ****
  11          *************************/
  12          extern void delay()// 延时函数
  13          {
  14   1      unsigned int i,j;
  15   1      for(i=60;i>0;i--) 
  16   1                for(j=256;j>0;j--);
  17   1      
  18   1      }
  19          
  20          uchar scankeypad ()
  21           { unsigned char key=16,temp;  
  22   1         P1=0xef;//扫描第一行
  23   1         temp=P1;
  24   1         if((temp&0x0f)!=0x0f)
  25   1         {
  26   2          delay();
  27   2          temp=P1;
  28   2           if ((temp&0x0f)!=0x0f)
  29   2               {
  30   3              switch(temp)
  31   3             {
  32   4               case 0xee:key=3;break;
  33   4               case 0xed:key=2;break;
  34   4               case 0xeb:key=1;break;
  35   4               case 0xe7:key=0;break;
  36   4             }
  37   3            }
  38   2               }
  39   1      
  40   1        P1=0xdf;//扫描第二行
  41   1        temp=P1;
  42   1         if((temp&0x0f)!=0x0f)
  43   1        {
  44   2         delay();
  45   2         temp=P1;
  46   2         if ((temp&0x0f)!=0x0f)
  47   2         {
  48   3            switch(temp)
  49   3           {
  50   4             case 0xde:key=7;break;
  51   4             case 0xdd:key=6;break;
  52   4             case 0xdb:key=5;break;
  53   4             case 0xd7:key=4;break;
  54   4            }
  55   3      
C51 COMPILER V7.06   KEYBSCAN                                                              05/16/2009 11:06:13 PAGE 2   

  56   3          }
  57   2         }
  58   1      
  59   1      P1=0xbf;//扫描第三行
  60   1      temp=P1;
  61   1      if((temp&0x0f)!=0x0f)
  62   1      {
  63   2      delay();
  64   2      temp=P1;
  65   2      if ((temp&0x0f)!=0x0f){
  66   3      switch(temp)
  67   3      {
  68   4      case 0xbe:key=11;break;
  69   4      case 0xbd:key=10;break;
  70   4      case 0xbb:key=9;break;
  71   4      case 0xb7:key=8;break;
  72   4      }
  73   3      
  74   3      }
  75   2      
  76   2      }
  77   1      
  78   1      P1=0x7f;//扫描第四行
  79   1      temp=P1;
  80   1      if((temp&0x0f)!=0x0f)
  81   1      {
  82   2      delay();
  83   2      temp=P1;
  84   2      if ((temp&0x0f)!=0x0f){
  85   3      switch(temp)
  86   3      {
  87   4      case 0x7e:key=15;break;
  88   4      case 0x7d:key=14;break;
  89   4      case 0x7b:key=13;break;
  90   4      case 0x77:key=12;break;
  91   4      }
  92   3      
  93   3      }
  94   2      }
  95   1         return key;
  96   1       }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    340    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----       2
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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