pwm.lst

小车跷跷板源程序

C51 COMPILER V7.07   PWM                                                                   07/31/2009 15:39:45 PAGE 1   


C51 COMPILER V7.07, COMPILATION OF MODULE PWM
OBJECT MODULE PLACED IN pwm.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE pwm.c BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          #include <reg51.h>
   2          sbit p1_2=P1^2;
   3          sbit p1_5=P1^5;
   4          int setnumber,count;
   5          void pwm(int number)
   6          int number;
   7          {       setnumber=number;                       /*有效脉冲的个数等于设定的值*/
   8   1              TMOD=0x01;
   9   1              TH0=0xfc;
  10   1              TL0=0x18;
  11   1              EA=1;                   
  12   1              ET0=1;
  13   1              TR0=1;                                  /*启动定时器0*/
  14   1                      }
  15          time0() interrupt 0 using 1
  16          {       TR0=0;                                  /*关定时器0*/
  17   1              if (count < setnumber)                  /*如果计数变量小于给定值则给电机送有效电平*/
  18   1              {       p1_2=0;
  19   2                      p1_5=0;
  20   2              }
  21   1          else                                        /*否则关电机驱动*/
  22   1              {       p1_2=1;
  23   2                      p1_5=1;
  24   2              }
  25   1         count++;
  26   1         if (count>=10)                               /*设定一个周期的脉冲个数为10*/
  27   1         count=0;
  28   1         TH0=0xfc;                                    /*重新设定计数初值，开定时器*/
  29   1         TL0=0x18;
  30   1         TR0=1;
  31   1      }
  32          main()
  33          { for(;;)
  34   1        pwm(2);
  35   1      }
  36          
  37          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    103    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =      4    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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