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Funny problem with PWM

 
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Funny problem with PWM
PostPosted: Wed Jun 01, 2005 5:52 am     Reply with quote
Hello,
I just finished settimg up my PWM for 38Khz.

chip used: PIC16F876A
Freq : 4Mhz

Code:

PWM_Setup()                                               //PWM setup function

{     
     setup_ccp1(CCP_PWM);                        // Configure CCP1 as a PWM
     setup_timer_2(T2_DIV_BY_1, 25, 1);
     set_pwm1_duty(13);
     
 }


void main()
{
   
   lcd_init();
   lcd_putc("\fPWM play\n");                                 
   PWM_setup();
   /*
         while(true)
      {
         printf("ping!\n");
      } */
         
}


A Hardware PWM is supposed to run in the background.
However the program seems to work only when the while loop is present.The PWM module shows no activity otherwise..
I have no idea why.

Regards
~ice
http://www.machinegrid.com
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Wed Jun 01, 2005 6:36 am     Reply with quote
Without the while loop, the program would fall off into nevernever land and eventually roll over and restart. For this reason, CCS inserts a sleep command at the end of main. The while loop keeps the pic running.
ice



Joined: 30 May 2005
Posts: 10
Location: India

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PostPosted: Thu Jun 02, 2005 10:26 pm     Reply with quote
Thanks Mark... : )
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**ice**
Machinegrid.com :: Robots at Work!!
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