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pwm weird output

 
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pwhitey86



Joined: 11 Jan 2007
Posts: 9
Location: Philadelphia, PA, USA

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pwm weird output
PostPosted: Mon Jan 22, 2007 3:27 pm     Reply with quote
hi i setup my pwm as such

EDIT: reposted code

Code:

#include <18F2680.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, BRGH1OK)  // Jumpers: 8 to 11, 7 to 12



void main() {
   char selection;
   signed int16 value;

  setup_ccp1(CCP_PWM);   // Configure CCP1 as a PWM
   setup_timer_2(T2_DIV_BY_1, 127, 1);
   value=0x01FF;
   printf("%4X\r",value);
   set_pwm1_duty(value);          // This sets the time the pulse is
}


but the output voltage is flat at 1.68 volts on the scope .... it is the same thing for all values of pwm duty from 1 to 255 ???
i am using a 18f2680

thanks

Last edited by pwhitey86 on Mon Jan 22, 2007 5:22 pm; edited 1 time in total
Ttelmah
Guest
PostPosted: Mon Jan 22, 2007 4:46 pm     Reply with quote
Repost the code.
At the moment, what you have, makes no sense, with two trailing braces, and the code just setting up the PWM, and running off the end putting the PIC to sleep. Normally this is caused by not hitting the 'Disable HTML in this post' tick box, when posting code, which if left unticked, makes code unreadable...

Best Wishes
pwhitey86



Joined: 11 Jan 2007
Posts: 9
Location: Philadelphia, PA, USA

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should have searched more
PostPosted: Mon Jan 22, 2007 5:40 pm     Reply with quote
this post helped

i forgot the while(1) at the end so it wouldn't sleep

http://www.ccsinfo.com/forum/viewtopic.php?t=17729&highlight=pwm+middle
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