key.lst

键盘扫描程序

C51 COMPILER V7.06   KEY                                                                   03/10/2008 10:46:29 PAGE 1   


C51 COMPILER V7.06, COMPILATION OF MODULE KEY
OBJECT MODULE PLACED IN key.OBJ
COMPILER INVOKED BY: d:\dep\Keil\C51\BIN\C51.EXE key.c LARGE BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          
   2          #include "key.h"
   3          #include "common.h"
   4          #include "def.h"
   5          
   6          #include<intrins.h>
   7          
   8          unsigned char getkey(void)      
   9          {       
  10   1        unsigned char buffer,display_bit,i;   
  11   1        buffer=0xff;  //赋初值为0xff
  12   1        delay_ms(0x08);       //延时去抖动
  13   1        display_bit=0xfe;     //扫描键盘
  14   1        for(i=0;i<8;i++)      
  15   1         {    
  16   2         send(display_bit);   
  17   2         if(!KD_KEY)  //是此键按下吗？
  18   2         {    
  19   3         buffer=display_bit;  //是，则保存其键值
  20   3         return(i);
  21   3         break;       //退出
  22   3         }    
  23   2         display_bit=_crol_(display_bit,1); 
  24   2                      //检测下一键
  25   2         }
  26   1      }       
  27                  


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     75    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----       3
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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