keypad.lst

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C51 COMPILER V7.06   KEYPAD                                                                03/08/2007 19:44:47 PAGE 1   


C51 COMPILER V7.06, COMPILATION OF MODULE KEYPAD
OBJECT MODULE PLACED IN keypad.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE keypad.C BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          #include<reg51.h>
   2          #define uchar unsigned char
   3          uchar  key_code[]={0x7e,0x7d,0x7b,0x77,0xbe,0xbd,0xbb,0xb7,0xde,0xdd,0xdb,0xd7,0xee,0xed,0xeb,0xe7};
   4          uchar duanma[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x73,0x3e,
             -0x6e,0x1c,0x23,0x40,0x03};
   5                 
   6          uchar code ksp[4]={0x7f,0xbf,0xdf,0xef};
   7          void delay(void)
   8          {
   9   1        uchar i,j;
  10   1         for(i=0;i<5;i++)
  11   1          for(j=0;j<255;j++);
  12   1            
  13   1      }
  14          uchar keypad_scan()
  15          {
  16   1        uchar key,i;
  17   1         P2=0xf0;
  18   1          while(P2!=0xf0);
  19   1         do{
  20   2            for(i=0;i<4;i++)
  21   2             {
  22   3              P2=ksp[i];
  23   3              if(P2!=ksp[i])
  24   3                 {
  25   4                   delay();
  26   4                   key=P2;
  27   4                   if(key!=ksp[i])
  28   4                     {return(key);}
  29   4                 }
  30   3         
  31   3            }
  32   2               }while(1);
  33   1      }
  34          
  35          char gotkey()
  36          {
  37   1        uchar i;
  38   1        char temp;
  39   1        temp=keypad_scan();
  40   1         for(i=0;i<16;i++)
  41   1             {
  42   2               if(temp==key_code[i]) return(i);
  43   2               }
  44   1      }
  45          void main()
  46          {  char ch;
  47   1         do{
  48   2            ch=gotkey();
  49   2            P1=duanma[ch]; 
  50   2           }while(1);
  51   1            
  52   1      }


C51 COMPILER V7.06   KEYPAD                                                                03/08/2007 19:44:47 PAGE 2   

MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     84    ----
   CONSTANT SIZE    =      4    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =     39    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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