扫描显示.lst

这是s52的扫描显示程序

C51 COMPILER V6.12  __描____                                                               04/10/2006 18:40:47 PAGE 1   


C51 COMPILER V6.12, COMPILATION OF MODULE __描____
OBJECT MODULE PLACED IN .\扫描显示.OBJ
COMPILER INVOKED BY: d:\Keil\C51\BIN\C51.EXE .\扫描显示.c DEBUG OBJECTEXTEND

stmt level    source

   1          #include<reg52.h>
   2          void delay(unsigned int x)       //延时子程序
   3          {
   4   1        while(x--);         
   5   1      }
   6          
   7          int jianpan()                     //键盘子程序
   8          {int x;
   9   1       P2=0xff;
  10   1       x=P2;
  11   1       return(x);
  12   1       }
  13          
  14          
  15          int yima(int x)                     //译码子程序
  16          {
  17   1      int y;
  18   1      switch(x)
  19   1        {case 0x01:y=0xf9;break;
  20   2         case 0x02:y=0xa4;break;
  21   2         case 0x03:y=0xb0;break; 
  22   2         case 0x04:y=0x99;break;
  23   2         case 0x05:y=0x92;break;
  24   2         case 0x06:y=0x82;break;
  25   2         case 0x07:y=0xd8;break;
  26   2         case 0x08:y=0x00;break;
  27   2         case 0x09:y=0x90;break;
  28   2         case 0x00:y=0xc0;break;
  29   2         default:break;
  30   2         }
  31   1      return(y);
  32   1      }
  33          
  34          
  35          main() //主程序
  36          {
  37   1      int x;
  38   1      int s=5000;//初始显示5000
  39   1      while(1)
  40   1        {
  41   2      
  42   2         P0=yima(s/1000);P2=0xef;
  43   2      	delay(500);
  44   2         P0=yima((s%1000)/100);P2=0xdf;
  45   2      	delay(500);
  46   2         P0=yima(((s%1000)%100)/10);P2=0xbf;
  47   2      	delay(500);
  48   2         P0=yima(((s%1000)%100)%10);P2=0x7f;
  49   2      	delay(500);
  50   2      
  51   2         x=jianpan();//调用键盘子程序
  52   2         if(x==0xfe){s++;}
  53   2      	if(x==0xfd){s--;}
  54   2      	
  55   2      	}
C51 COMPILER V6.12  __描____                                                               04/10/2006 18:40:47 PAGE 2   

  56   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    314    ----
   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)