C51 COMPILER V7.20   KEYSCAN                                                               09/04/2007 22:35:46 PAGE 1   


C51 COMPILER V7.20, COMPILATION OF MODULE KEYSCAN
OBJECT MODULE PLACED IN .\Obj\KeyScan.obj
COMPILER INVOKED BY: D:\Keil\C51\BIN\C51.EXE Src\KeyScan.C LARGE BROWSE DEBUG OBJECTEXTEND PRINT(.\Lst\KeyScan.lst) OBJE
                    -CT(.\Obj\KeyScan.obj)

line level    source

   1          #include "CPU.H"
   2          extern void Delayms(U16 Ms);
   3          
   4          /*
   5          *****************************************************************************
   6          * KeyScan - 鍵盤掃描函數
   7          * DESCRIPTION: -
   8          * 判4個按鍵那個有按下
   9          * @Param void:
  10          * @Return :有按鍵 返回鍵值 無按鍵 返回false 因此鍵值定義不能為false
  11          * ----
  12          *****************************************************************************
  13          */
  14          U8 KeyScan(void)
  15          {
  16   1          Key0 = 1;
  17   1          Key1 = 1;
  18   1          Key2 = 1;
  19   1          Key3 = 1;
  20   1          if((Key0==0)||(Key1==0)||(Key2==0)||(Key3==0)){
  21   2              Delayms(20);
  22   2              if((Key0==0)||(Key1==0)||(Key2==0)||(Key3==0)){
  23   3                  if((Key0==0)&&(Key1==1)&&(Key2==1)&&(Key3==1)){      //Key0
  24   4                      return Key_Up;
  25   4                  }else if((Key0==1)&&(Key1==0)&&(Key2==1)&&(Key3==1)){//Key1
  26   4                      return Key_Right;
  27   4                  }else if((Key0==1)&&(Key1==1)&&(Key2==0)&&(Key3==1)){//Key2
  28   4                      return Key_Left;
  29   4                  }else if((Key0==1)&&(Key1==1)&&(Key2==1)&&(Key3==0)){//Key3
  30   4                      return Key_Down;
  31   4                  }else{
  32   4                      return false;
  33   4                  }
  34   3      
  35   3              }else {
  36   3                  return false;
  37   3              }//no key press
  38   2          }else{
  39   2              return false;
  40   2          }
  41   1      }
  42          #if 0
              /*
              *****************************************************************************
              * WaitKey - 死等一個有效按鍵輸入
              * DESCRIPTION: -
              *
              * @Param void:
              * @Return : 按鍵鍵值
              * ----
              *****************************************************************************
              */
              U8 WaitKey(void)
              {
C51 COMPILER V7.20   KEYSCAN                                                               09/04/2007 22:35:46 PAGE 2   

              
              while(1){
                  switch(KeyScan()){
                      case Key_Up:{
                          return Key_Up;
                          break;
                      }
                      case Key_Down:{
                          return Key_Down;
                          break;
                      }
                      case Key_Left:{
                          return Key_Left;
                          break;
                      }
                      case Key_Right:{
                          return Key_Right;
                          break;
                      }
                      default:
                          break;
                  }
              }
              
              }
              #endif


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    108    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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