渐明渐暗彩灯.lst

LED逐渐点亮再逐渐熄灭

C51 COMPILER V8.05a   渐胈渐暗彩灯                                                         05/29/2008 08:48:44 PAGE 1   


C51 COMPILER V8.05a, COMPILATION OF MODULE 渐胈渐暗彩灯
OBJECT MODULE PLACED IN 渐明渐暗彩灯.OBJ
COMPILER INVOKED BY: D:\Program Files\Keil c51 v8.05\C51\BIN\C51.EXE 渐明渐暗彩灯.c DEBUG OBJECTEXTEND

line level    source

   1          #include   <AT89X52.h>
   2          sbit LED=P2^0;            //定义P1.0为LED控制口，低电平使能
   3          void delay (unsigned int d)       //延时功能函数，由d决定延时长度
   4          {       
   5   1              unsigned char i;
   6   1              while( --d != 0)
   7   1              {
   8   2                      for(i = 0; i < 2; i++);
   9   2              }                                  
  10   1      }
  11          /*************************************************************
  12          * 主函数 *
  13          实验板上连接到P2.0上的LED逐渐点亮再逐渐熄灭
  14          /*************************************************************/
  15          void main (void)
  16          {
  17   1              unsigned char a, b;//a控制延时长度　b控制循环周期
  18   1              while (1)
  19   1              {
  20   2                      LED = 1;
  21   2                      a = 0x00;
  22   2              for (b=250; b>0; b--)
  23   2                      {
  24   3                      a++;
  25   3                              delay (a);              //延时长度随a而改变
  26   3                              LED = 0;
  27   3                      a = ~a;                 //a值取反，决定灯灭时的占空比
  28   3                      delay (a);
  29   3                              LED = 1;
  30   3                              a = ~a;                 //a值取反　使a回到原值继续循环
  31   3               }
  32   2                      LED = 0;                        //亮起LED
  33   2                      a = 0x00;
  34   2                      for (b=250; b>0; b--)
  35   2                      {
  36   3                              a++;
  37   3                              delay (a);
  38   3                              LED = 1;
  39   3                              a = ~a;
  40   3                              delay (a);
  41   3                              LED = 0;
  42   3                              a = ~a;
  43   3                      }
  44   2                      LED = 1;
  45   2              }
  46   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     76    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
C51 COMPILER V8.05a   渐胈渐暗彩灯                                                         05/29/2008 08:48:44 PAGE 2   

   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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