pwm.lst

pulse width modulation code using servo motor

C51 COMPILER V6.20c  PWM                                                                   03/20/2009 11:01:56 PAGE 1   


C51 COMPILER V6.20c, 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 PWMPIN=P1^0;
   3          bit F;
   4          unsigned char pwm_width;
   5          
   6          void pwm_setup()
   7          {
   8   1              TMOD = 0;
   9   1              pwm_width =160;
  10   1              EA = 1;
  11   1              ET0 = 1;
  12   1              TR0 = 1;
  13   1      }
  14          
  15          void timer0() interrupt 1
  16           {
  17   1              if(!F)
  18   1       		{       //Start of High level
  19   2                      F=1; //Set flag
  20   2                      PWMPIN=~PWMPIN;     //Set PWM o/p pin
  21   2                      TH0=pwm_width;        //Load timer
  22   2                      TF0=0;                //Clear interrupt flag
  23   2                      return;         //Return
  24   2              }
  25   1              else {  //Start of Low level
  26   2                      F=0; //Clear flag
  27   2                      PWMPIN = ~PWMPIN;     //Clear PWM o/p pin
  28   2                      TH0 =255-pwm_width;  //Load timer
  29   2                      TF0=0;        //Clear Interrupt flag
  30   2                      return;         //return
  31   2              }
  32   1      }
  33          
  34          void main()
  35          {
  36   1      	pwm_setup();
  37   1      	while(1);
  38   1      }
  39          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     54    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =      1    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =      1    ----
END OF MODULE INFORMATION.


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