keyboard.lst

用89C51做的一个简单的电子钟

C51 COMPILER V7.06   KEYBOARD                                                              03/08/2006 13:20:05 PAGE 1   


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

stmt level    source

   1          /*
   2           keyboard.c file
   3           Created by Computer-lov. Date: 2005.5.31
   4           Last edited date:2005.5.31
   5           Copyright (c) 2005 Computer-lov
   6           version 1.0
   7           All rigths reserved
   8           欢迎访问我的blog：  http://computer00.21ic.org
   9          */
  10          
  11          #include "keyboard.h"
  12          
  13          unsigned char key,key_old,key_new,key_pressed_time;
  14          
  15          void scan_keyboard(void)                //键盘扫描
  16          {
  17   1       if(key)return;
  18   1       if((KEY_INPUT & KEY_PIN)==KEY_PIN)    //按键释放
  19   1        {
  20   2         if(!key_old)                        //如果上次无按键按下
  21   2          {
  22   3           return;                           //返回
  23   3          }
  24   2         else                                //如果上次有按键按下
  25   2          {
  26   3           if(key_pressed_time>100)          //按键时间超过一秒，长按键码
  27   3            {
  28   4      //       key=key_old+0x80;               //长按键码等于普通按键码加0x80
  29   4            }
  30   3           else if(key_pressed_time>1)
  31   3            {
  32   4             key=key_old;                     //按键值
  33   4            }
  34   3           key_old=0;
  35   3          }
  36   2         return;
  37   2        }
  38   1       else                                  //按键按下
  39   1        {
  40   2         key_new=0;
  41   2         if(FUNCTION_KEY)key_new=KEY_FUNCTION;        //MENU键按下
  42   2         if(DOWN_KEY)key_new=KEY_DOWN;                //DOWN键按下
  43   2         if(UP_KEY)key_new=KEY_UP;                    //UP键按下
  44   2         if(key_new==key_old)                         //如果按键按下长于10ms
  45   2          { 
  46   3           if(key_pressed_time>80)                   //如果按键按下超过1s
  47   3            {
  48   4             key_pressed_time-=5;                     //则自动按键。相当于每隔50ms按一次
  49   4             key=key_new;
  50   4             return;
  51   4            }
  52   3           else
  53   3            {
  54   4             key_pressed_time++;                      //按键按下计时加一
  55   4            }
C51 COMPILER V7.06   KEYBOARD                                                              03/08/2006 13:20:05 PAGE 2   

  56   3          }
  57   2         else
  58   2          {
  59   3           key_pressed_time=0;                       //如果本次按下跟上次按下不一样，则按键按下时间清零
  60   3          }
  61   2         key_old=key_new;                            //保存本次按键值
  62   2        }
  63   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     91    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =      4    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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