up51s005.lst

此代码为按键扫描程序

C51 COMPILER V7.08   UP51S005                                                              01/04/2005 16:20:42 PAGE 1   


C51 COMPILER V7.08, COMPILATION OF MODULE UP51S005
OBJECT MODULE PLACED IN up51s005.OBJ
COMPILER INVOKED BY: C:\KEIL\C51\BIN\C51.EXE up51s005.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          /*******************************************************************************
   2          *                                                                              *
   3          *    File       : uP51s005.c                                                   *
   4          *    Date       : 2004-9-5                                                     *
   5          *    Version    : 1.0                                                          *
   6          *                                                                              *
   7          *    Author     : kevin           [e-mail]                               *
   8          *    Company    : Http://www.dz51.com                                          *
   9          *                                                                              *
  10          ********************************************************************************
  11          *    Description:                                                              *
  12          *                按键扫描程序                                                  *
  13          *                上电时, 点亮P00口LED                                          *
  14          *                按下AN1时, LED向右移一位                                      *
  15          *                按下AN2时, LED向左移一位                                      *
  16          *******************************************************************************/
  17          #include <reg51.h>
  18          #include <intrins.h>
  19          
  20          unsigned char scan_key();
  21          void proc_key(unsigned char key_v);
  22          void delayms(unsigned char ms);
  23          
  24          sbit    AN1 = P3^2;
  25          sbit    AN2 = P3^3;
  26          unsigned char leddata=0xfe;
  27          main()
  28          {
  29   1              
  30   1              unsigned char key_s,key_v;
  31   1              key_v = 0x03;
  32   1              P0 = leddata;
  33   1              while(1)
  34   1              {
  35   2                      key_s = scan_key();
  36   2                      if(key_s != key_v)
  37   2                      {
  38   3                              delayms(10);
  39   3                              key_s = scan_key();
  40   3                              if(key_s != key_v)
  41   3                              {       
  42   4                                      key_v = key_s;
  43   4                                      proc_key(key_v);                                        
  44   4                              }
  45   3                      }
  46   2              }       
  47   1      }
  48          
  49          unsigned char scan_key()
  50          {
  51   1              unsigned char key_s;
  52   1              key_s = 0x00;
  53   1              key_s |= AN2;
  54   1              key_s <<= 1;
  55   1              key_s |= AN1;
C51 COMPILER V7.08   UP51S005                                                              01/04/2005 16:20:42 PAGE 2   

  56   1              return key_s;           
  57   1      }
  58          
  59          void proc_key(unsigned char key_v)
  60          {
  61   1              if((key_v & 0x01) == 0)
  62   1              {
  63   2                      leddata = _cror_(leddata,1);
  64   2              }
  65   1              else if((key_v & 0x02) == 0)
  66   1              {
  67   2                      leddata = _crol_(leddata, 1);
  68   2              }
  69   1              P0=leddata;
  70   1      }
  71          
  72          void delayms(unsigned char ms)  
  73          // 延时子程序
  74          {                                               
  75   1              unsigned char i;
  76   1              while(ms--)
  77   1              {
  78   2                      for(i = 0; i < 120; i++);
  79   2              }
  80   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    115    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =      1       2
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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