keyboard.lst

AD89C51单片机控制液晶显示器LCD1602显示时间。

C51 COMPILER V7.02a   KEYBOARD                                                             09/12/2008 14:50:31 PAGE 1   


C51 COMPILER V7.02a, 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          #include <at89x51.h>
   2          
   3          #define ENTER              (!(P2_4))
   4          #define FUNCTION_KEY   (!(P2_5))
   5          #define UP_KEY         (!(P2_6))
   6          #define DOWN_KEY       (!(P2_7))
   7          
   8          #define KEY_INPUT      P2
   9          #define KEY_PIN        0xF0
  10          
  11          #define KEY_NOTHING       0
  12          #define KEY_FUNCTION      1
  13          #define KEY_UP            2
  14          #define KEY_DOWN          3
  15          #define KEY_ENTER         4
  16          
  17          unsigned char key,key_old,key_new,key_pressed_time;
  18          
  19          void scan_keyboard(void)                //键盘扫描
  20          {
  21   1       if(key)return;
  22   1       if((KEY_INPUT & KEY_PIN)==KEY_PIN)    //按键释放
  23   1        {
  24   2         if(!key_old)                        //如果上次无按键按下
  25   2          {
  26   3           return;                           //返回
  27   3          }
  28   2         else                                //如果上次有按键按下
  29   2          {
  30   3           if(key_pressed_time>100)          //按键时间超过一秒，长按键码
  31   3            {
  32   4      //       key=key_old+0x80;               //长按键码等于普通按键码加0x80
  33   4            }
  34   3           else if(key_pressed_time>1)
  35   3            {
  36   4             key=key_old;                     //按键值
  37   4            }
  38   3           key_old=0;
  39   3          }
  40   2         return;
  41   2        }
  42   1       else                                  //按键按下
  43   1        {
  44   2         key_new=0;
  45   2         if(FUNCTION_KEY)key_new=KEY_FUNCTION;        //MENU键按下
  46   2      
  47   2              if(ENTER)key_new=KEY_ENTER;
  48   2         if(DOWN_KEY)key_new=KEY_DOWN;                //DOWN键按下
  49   2         if(UP_KEY)key_new=KEY_UP;                    //UP键按下
  50   2         if(key_new==key_old)                         //如果按键按下长于10ms
  51   2          { 
  52   3           if(key_pressed_time>80)                   //如果按键按下超过1s
  53   3            {
  54   4             key_pressed_time-=5;                     //则自动按键。相当于每隔50ms按一次
  55   4             key=key_new;
C51 COMPILER V7.02a   KEYBOARD                                                             09/12/2008 14:50:31 PAGE 2   

  56   4             return;
  57   4            }
  58   3           else
  59   3            {
  60   4             key_pressed_time++;                      //按键按下计时加一
  61   4            }
  62   3          }
  63   2         else
  64   2          {
  65   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
  66   3          }
  67   2         key_old=key_new;                            //保存本次按键值
  68   2        }
  69   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     97    ----
   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)