4x4+

该程序源代码是以C编写的4X4键盘程序,仅供参考用..

C51 COMPILER V7.10   4X4键臺                                                               08/20/2006 16:29:19 PAGE 1   


C51 COMPILER V7.10, COMPILATION OF MODULE 4X4键臺
OBJECT MODULE PLACED IN 4X4键盘.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE 4X4键盘.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          #include<reg51.h>
   2          void delay(void);
   3          unsigned char checkkey(void);
   4          unsigned char key(void);
   5          
   6          void main()
   7          {
   8   1       unsigned char code table[]={0x28,0xeb,0x32,0x62,0xe1,0x64,0x24,0xea,0x20,0x60,0xA0,0x25,0x3C,0x23,0x34,0x
             -B4};  //0 to F
   9   1       unsigned char m;
  10   1      
  11   1       m=0;
  12   1       P2=0xff;
  13   1       while(1)
  14   1       {
  15   2         if(checkkey()!=0)
  16   2         {
  17   3          delay();
  18   3              if(checkkey()!=0)
  19   3              {
  20   4                m=key();
  21   4                }
  22   3              }
  23   2        P0=table[m];
  24   2        }
  25   1       }
  26          
  27          
  28          unsigned char checkkey(void)
  29          {
  30   1        unsigned char n;
  31   1        P3=0xf0;
  32   1        n=P3;
  33   1        return(~n&0xf0);
  34   1        }
  35          
  36          
  37          unsigned char key(void)
  38          {
  39   1       unsigned char i;
  40   1       unsigned char k;
  41   1       unsigned char n;
  42   1       unsigned char temp;
  43   1        
  44   1       i=0xfe;
  45   1       n=5;
  46   1       do
  47   1       {
  48   2        P3=i;
  49   2        temp=~P3&0xf0;
  50   2        i=(i<<1)|0x01;
  51   2        }
  52   1        while((--n!=0)&&(temp==0));
  53   1      
  54   1         if(temp!=0)
C51 COMPILER V7.10   4X4键臺                                                               08/20/2006 16:29:19 PAGE 2   

  55   1         {
  56   2               if(~P3&0x80)k=16-4*n;
  57   2               if(~P3&0x40)k=16-4*n+1;
  58   2               if(~P3&0x20)k=16-4*n+2;
  59   2               if(~P3&0x10)k=16-4*n+3;
  60   2               P3=0xf0;
  61   2               
  62   2           do
  63   2                {
  64   3                 ;
  65   3                 }while(~P3&0xf0);
  66   2              }
  67   1              return(k);
  68   1       }
  69          
  70           void delay(void)
  71           {
  72   1         unsigned char j;
  73   1         unsigned char k;
  74   1      
  75   1         for(j=20;j>0;j--)
  76   1         for(k=250;k>0;k--);
  77   1         }
  78           
  79            


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    163    ----
   CONSTANT SIZE    =     16    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----       1
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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