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PWM 16f877a

 
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farouk_baya



Joined: 18 Jun 2010
Posts: 27

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PWM 16f877a
PostPosted: Wed Aug 25, 2010 3:55 pm     Reply with quote
I use L298 + 16f877a.
When I tested the L298 it works fine. I put 5v to input Enables to test it.
Code:

#include "16F877.h"
#fuses XT,PUT, NOWDT, NOPROTECT, BROWNOUT,  NOLVP
#use delay(clock = 4M)

main()
{
int8 x=0;

output_low(PIN_C2);
setup_ccp1(CCP_PWM);
setup_timer_2(T2_DIV_BY_4,249, 1);  // 1000 Hz     
set_pwm1_duty(62);

while(1)
  {
   if (x==249)
     {
      x=0;
     }
  else
    {
     x=x+10;
    }
 
  set_pwm1_duty(x);
  delay_ms(2000);
 }
}

The problem that I hear a sound from the motors but nothing is happening.

thanks for help.
nilsener



Joined: 06 Dec 2005
Posts: 59

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PostPosted: Fri Aug 27, 2010 1:59 am     Reply with quote
as you increment x by 10 (x=x+10;), x will never be 249 and your

Code:

if (x==249)
  {
   x=0;
  }


will never be entered. Try

Code:

if (x > 249)
  {
   x=0;
  }


or something similar.

I think this is not the reason why your motor is not running, but worth to check.
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