key.lst

此程序为单片机键盘程序,是简短高效的4*4键盘程度

C51 COMPILER V8.01   KEY                                                                   08/05/2007 16:55:48 PAGE 1   


C51 COMPILER V8.01, COMPILATION OF MODULE KEY
OBJECT MODULE PLACED IN key.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE key.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          #include<reg52.h>
   2          #define uchar unsigned char
   3          #define uint unsigned int
   4          void dlms(void);
   5          void delay(void);
   6          uchar kbscan(void);
   7          void main (void)
   8          {
   9   1       uchar key;
  10   1       uchar a=0x00;
  11   1       uchar b=0x00;
  12   1       P2=0x00;
  13   1       while(1)
  14   1       {
  15   2        key=kbscan();
  16   2        dlms();
  17   2         switch(key)
  18   2        {case 0xee:a++;P2=a+b;break;
  19   3         case 0xde:b++;b=b*10;P2=b+a;break;
  20   3        }
  21   2        delay();
  22   2      }
  23   1      }
  24                                  
  25          
  26          void dlms (void)
  27           { uchar i;
  28   1       for(i=200;i>0;i--){ }
  29   1        }
  30          
  31          void delay(void) 
  32          
  33          { 
  34   1      
  35   1        unsigned char m,n,s; 
  36   1      
  37   1        for(m=9;m>0;m--) 
  38   1      
  39   1        for(n=30;n>0;n--) 
  40   1      
  41   1        for(s=248;s>0;s--); 
  42   1      
  43   1      }
  44          
  45          
  46          uchar kbscan(void)
  47          {uchar sccode,recode;
  48   1        P1=0xf0;                                                                               
  49   1        if((P1&0xf0)!=0xf0)
  50   1            {dlms();
  51   2                if((P1&0xf0)!=0xf0)
  52   2                {sccode=0xfe;
  53   3                  while((sccode&0x10)!=0)
  54   3                       {P1=sccode;
  55   4                        if((P1&0xf0)!=0xf0)
C51 COMPILER V8.01   KEY                                                                   08/05/2007 16:55:48 PAGE 2   

  56   4                         {recode=P1&0xf0;
  57   5                     sccode=sccode&0x0f;
  58   5                 return(sccode+recode);
  59   5                     }
  60   4              else
  61   4                sccode=(sccode<<1)|0x01;
  62   4                       }
  63   3                 }
  64   2                 }
  65   1      return(0);
  66   1      }
  67          
  68          
  69          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    131    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----       3
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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