C51 COMPILER V8.02   KEY                                                                   09/13/2007 16:35:02 PAGE 1   


C51 COMPILER V8.02, COMPILATION OF MODULE KEY
OBJECT MODULE PLACED IN Key.OBJ
COMPILER INVOKED BY: d:\Keil3\C51\BIN\C51.EXE Key.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          #define  Key
   2          #include <Key.h>
   3          
   4          // 主程序,通過調用"讀鍵值" 和 "譯碼" 程序, 將鍵值返回給主調函數
   5          uchar Key_Word(void)
   6          {
   7   1         unsigned char key,m;
   8   1         unsigned char key_decode = 0xff  ;
   9   1      
  10   1         P1=0xf0;
  11   1         m=P1;
  12   1         if(m!=0xf0)            //有輸入
  13   1           {
  14   2              key_delay(100,100);   //去抖
  15   2              P1=0xf0;
  16   2              m=P1;
  17   2              if(m!=0xf0)       //確認有鍵
  18   2                {
  19   3                   key=Read();
  20   3                   key_decode=Decode(key);
  21   3      
  22   3                   P1=0xf0;
  23   3                   while(P1!=0xf0);//等待鍵釋放
  24   3                 }
  25   2            }
  26   1          return(key_decode);
  27   1      }
  28          
  29          //讀鍵值 ------------------
  30          
  31          uchar Read(void)
  32          {
  33   1       uchar key,H,L;
  34   1       P1=0xf0;
  35   1       key_delay(1,10);
  36   1       H=P1&0XF0;
  37   1      //---------------
  38   1       key_delay(1,10);
  39   1       P1=0x0f;
  40   1       key_delay(1,10);
  41   1       L=P1&0X0F;
  42   1      //---------------
  43   1       key=H|L;
  44   1       key=~key;
  45   1       return(key);
  46   1      }
  47          //譯碼
  48          
  49          uchar Decode(uchar x)
  50          {
  51   1        uchar i,j,k;
  52   1        for(i=0;i<4;i++)
  53   1          for(j=0;j<4;j++)      
  54   1             {
  55   2               if(x==key_s[i][j])
C51 COMPILER V8.02   KEY                                                                   09/13/2007 16:35:02 PAGE 2   

  56   2               k=key_t[i][j];
  57   2             }
  58   1        return(k);
  59   1       }
  60          //////////////////////////////////////////
  61          
  62          void key_delay(uchar t1,t2)
  63          { 
  64   1        uchar i,j;
  65   1        for(i=0;i<t1;i++)
  66   1          for(j=0;j<t2;j++);
  67   1      }
  68          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    190    ----
   CONSTANT SIZE    =     32    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----       2
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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