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Low Frequency PWM

 
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umka



Joined: 28 Aug 2007
Posts: 99
Location: New Zealand

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Low Frequency PWM
PostPosted: Wed Jan 16, 2008 4:20 pm     Reply with quote
how does one get a low frequency?

i dont know how to get it to 50Hz i can get much less than 250Hz. do i have to go to a slower crystal? the adc sets the duty ratio.

Code:
#include <16F877a.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=4000000)

void main() {
   int value;

   setup_ccp1(CCP_PWM);
         
   setup_timer_2(T2_DIV_BY_16, 249, 5);

  setup_port_a(ALL_ANALOG);
  setup_adc(adc_clock_internal);
  set_adc_channel( 0 );

  while( TRUE ) {
    value=read_adc();
    set_pwm1_duty(value);         
  }
 
}
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Jan 16, 2008 5:18 pm     Reply with quote
You could use Timer0 (RTCC) to do software PWM. See this thread
for a link to the code.
http://www.ccsinfo.com/forum/viewtopic.php?t=30175
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