key.lst

51单片机的键盘扫描程序,当有键盘输入是,将在LED上显示,且蜂鸣器将发出相应的响声.

C51 COMPILER V7.06   KEY                                                                   07/13/2005 16:20:33 PAGE 1   


C51 COMPILER V7.06, COMPILATION OF MODULE KEY
OBJECT MODULE PLACED IN key.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE key.c WARNINGLEVEL(1) BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          //key.c
   2          #include"general.h"
   3          #include"sys12M.h"
   4          sbit key = P1^0;
   5          //initialize the key_board
   6          void init_key(void)
   7          {
   8   1              EAIO = 0xFF;
   9   1              DATA = 0x00;
  10   1      }
  11          
  12          //scan the key when there is a key-press
  13          BYTE scan_key(void)
  14          {
  15   1              BYTE i;
  16   1              delay(10);
  17   1              if(key) return 0;
  18   1              DATA = 0xFE;
  19   1              for(i=1,key=1;i<8;i++)
  20   1              {
  21   2                      
  22   2                      if(!key) break;
  23   2                      DATA = _crol_(DATA,1);
  24   2              }
  25   1              delay(10);
  26   1              return DATA;
  27   1      }
  28          //read the key when there is a key-press
  29          BYTE read_key(void)
  30          {
  31   1              BYTE i;
  32   1              if(key) return 0;
  33   1              DATA = 0xFE;
  34   1              for(i=1,key=1;i<8;i++)
  35   1              {
  36   2                      
  37   2                      if(!key) break;
  38   2                      DATA = _crol_(DATA,1);
  39   2              }
  40   1              delay(10);
  41   1              return i;
  42   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    104    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----       1
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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