key_scan.lst

一种多功能频率计

C51 COMPILER V8.08   KEY_SCAN                                                              09/23/2008 07:30:52 PAGE 1   


C51 COMPILER V8.08, COMPILATION OF MODULE KEY_SCAN
OBJECT MODULE PLACED IN key_scan.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE key_scan.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          
   2          /**************************************/                                                                                                                                                                                                                                                                                                                                                                                 /******************
             -********************/
   3          //                                      键扫描、判断模块        
   4          /**************************************/
   5          #include<reg52.h>
   6          #include<key_scan.h>
   7          #include <delay.h>
   8          
   9          
  10          uchar kbscan(void)
  11          { uchar k,i=20;
  12   1        uchar j=0;
  13   1        uchar flag=1;
  14   1        P1=0xff;
  15   1        while(flag==1)
  16   1        { k=P1;
  17   2       // if((k&0x1f)!=0x1f)
  18   2       if((k&0x1f)!=0x03)
  19   2       {
  20   3        while(i--);
  21   3         k=P1;
  22   3      // if((k&0x1f)!=0x1f)
  23   3        if((k&0x1f)!=0x03)
  24   3       { k=k&0x03;
  25   4        switch(k)
  26   4        {
  27   5        case 0x02:flag=0;j=1; break;
  28   5        case 0x01:flag=0;j=2; break;
  29   5        case 0x1b:flag=0;j=3; break;
  30   5        case 0x17:flag=0; j=4;break;
  31   5        case 0x0f:flag=0;j=5; break;  
  32   5        //default:break;       
  33   5        }
  34   4       }
  35   3       }
  36   2       }
  37   1      return j;
  38   1      }
  39          
  40          
  41          
  42          
  43          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     96    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.

C51 COMPILER V8.08   KEY_SCAN                                                              09/23/2008 07:30:52 PAGE 2   


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