C51 COMPILER V7.06   KEYSCAN                                                               10/04/2008 23:30:33 PAGE 1   


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

stmt level    source

   1          #include <reg51.h>
   2          #include <string.h>
   3          #include <intrins.h>
   4          #include <stdio.h>
   5          #include "base.h"
   6          
   7          #define KEYPORT P1
   8          
   9          uchar code col_code[4]={0xe0,0xd0,0xb0,0x70};
  10          uchar  keypressed()
  11          {uchar f=0;
  12   1         KEYPORT=0xf0;
  13   1         if((KEYPORT&0xf0)!=0xf0)
  14   1           {
  15   2             delay_ms(20);
  16   2                 if((KEYPORT&0xf0)!=0xf0)
  17   2                    f=KEYPORT&0xf0;
  18   2                 else 
  19   2                    f=0;
  20   2               }
  21   1        else 
  22   1          f=0;
  23   1      
  24   1        return f;
  25   1      }
  26          
  27          uchar getcol(uchar c)
  28          {
  29   1       uchar i=0;
  30   1       bit find=0;
  31   1       while (!find && i<4)
  32   1        {
  33   2          if (col_code[i]==(c&0xf0))
  34   2                find=1;
  35   2              i++;
  36   2        }
  37   1       if (find) 
  38   1         return i;
  39   1       else
  40   1         return 0;
  41   1      }
  42          
  43          uchar getkey()
  44          { uchar col=0,row=0,i=0,key;
  45   1        bit f=1;
  46   1        if (keypressed())
  47   1          {
  48   2           col=getcol(KEYPORT&0XF0);
  49   2           for(i=0;i<4;i++)
  50   2               {
  51   3              KEYPORT=(col_code[i]>>4)|0xf0;
  52   3                  if ((KEYPORT&0xf0)!=0xf0)
  53   3                         row=i;
  54   3               }
  55   2               KEYPORT=0xf0;
C51 COMPILER V7.06   KEYSCAN                                                               10/04/2008 23:30:33 PAGE 2   

  56   2               while ((KEYPORT&0xf0)!=0xf0);
  57   2               return row*10+col;
  58   2              }
  59   1      }
*** WARNING C280 IN LINE 44 OF KEYSCAN.C: 'key': unreferenced local variable


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    162    ----
   CONSTANT SIZE    =      4    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----       5
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----       2
END OF MODULE INFORMATION.


C51 COMPILATION COMPLETE.  1 WARNING(S),  0 ERROR(S)