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software pwm

 
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tmsenthil03



Joined: 27 Feb 2011
Posts: 4
Location: chennai

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software pwm
PostPosted: Wed Jun 01, 2011 8:52 am     Reply with quote
http://www.ccsinfo.com/forum/viewtopic.php?t=30139

My question is.........

As brood discussed above . I had test this code, it is working fine. only thing is if any one in the following variable is equal to zero. the output is goes to maximum width.

red_duty = __;
green_duty = __;
blue_duty = __;

I need if these variables are equal to zero, the output will go to zero. How can i make it to Zero , pls give the note.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Jun 02, 2011 2:35 pm     Reply with quote
I modified his code a little bit and it works better now. Here is the revised program:

Code:

#include <18F4520.h>
#fuses HS,NOWDT,PUT,BROWNOUT,NOLVP
#use delay(clock=20M)

#define PRELOAD (65536 - 180)

#define RED    PIN_D0
#define GREEN  PIN_D1
#define BLUE   PIN_D2

int red_duty;
int green_duty;
int blue_duty;
int Intcount;


#int_timer1
void timer1_isr()
{
set_timer1(PRELOAD + get_timer1()); 

// Interrupt marker for viewing on oscilloscope.
//output_high(PIN_D7); 
//delay_us(1);
//output_low(PIN_D7);
   
if(Intcount == 255)
  {
   Intcount = 0;
   if(red_duty) output_high(RED);
   if(green_duty) output_high(GREEN);
   if(blue_duty) output_high(BLUE);   
  }   
   
if(Intcount == red_duty)
  {
   output_low(RED);
  }   

if(Intcount == green_duty)
  {
   output_low(GREEN);
  }   
 
if(Intcount == blue_duty)
  {
   output_low(BLUE);
  }   

Intcount++;
}


//=========================================
void main()
{

// Initialize interrupt counter and output pins.
Intcount = 0;
output_low(RED);
output_low(GREEN);
output_low(BLUE);

red_duty = 0;
green_duty = 1;
blue_duty = 2;

//red_duty = 253;
//green_duty = 254;
//blue_duty = 255;

setup_timer_1(T1_INTERNAL | T1_DIV_BY_1);
enable_interrupts(INT_TIMER1);
enable_interrupts(GLOBAL);


while(1);
}


 
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