led.lst

51单片机实验例程

C51 COMPILER V7.10   LED                                                                   04/16/2010 16:54:33 PAGE 1   


C51 COMPILER V7.10, COMPILATION OF MODULE LED
OBJECT MODULE PLACED IN led.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE led.c BROWSE DEBUG OBJECTEXTEND

line level    source

   1          /*******************************************************************************
   2          *  标题:                  试验数码管上如何显示数字(共阳极)                     *
   3          *                                                                                                                                                          *
   4          *  连接方法：P0 与JP3 用8PIN排线连接                                           *
   5          ********************************************************************************
   6          *                                                                                                                      *
   7          * 请学员认真消化本例程，用单片机脚直接控制数码管                               *
   8          ********************************************************************************/
   9          
  10          
  11          #include <reg51.h> 
  12          #include <intrins.h>
  13          #define  NOP() _nop_()  /* 定义空指令 */
  14          
  15          
  16          void delay(unsigned int i);      //函数声名
  17          
  18           
  19          // 此表为 LED 的字模          
  20          unsigned char code LED7Code[] = {~0x3F,~0x06,~0x5B,~0x4F,~0x66,~0x6D,~0x7D,~0x07,~0x7F,~0x6F,~0x77,~0x7C,~
             -0x39,~0x5E,~0x79,~0x71};
  21          
  22           
  23          main()
  24          {  
  25   1         unsigned int LedNumVal=1 ,C ;
  26   1         
  27   1        while(1)
  28   1        {      
  29   2                 if (++C>= 300) 
  30   2                      { LedNumVal++ ;  //每隔300个扫描周期加一次
  31   3                        C =0;          //每隔300个扫描清零
  32   3                       }      
  33   2                       
  34   2                      P0 = LED7Code[LedNumVal%10]&0x7f;     //LED7 0x7f为小数点 共阴和共阳此处也是不一样;
  35   2                      
  36   2                               
  37   2                      delay(150);       //调用延时程序
  38   2               
  39   2        }   
  40   1      }
  41                  
  42          /*****************************************************************
  43          *                                                                                                                                *
  44          *             延时程序                                                                                   *
  45          *                                                                                                                                *
  46          *****************************************************************/
  47          void delay(unsigned int i)
  48          {
  49   1          char j;
  50   1          for(i; i > 0; i--)
  51   1              for(j = 200; j > 0; j--);
  52   1      }
  53          

C51 COMPILER V7.10   LED                                                                   04/16/2010 16:54:33 PAGE 2   


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    102    ----
   CONSTANT SIZE    =     16    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----       4
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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