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Exit an interrupt ?

 
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ELCouz



Joined: 18 Jul 2007
Posts: 427
Location: Montreal,Quebec

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Exit an interrupt ?
PostPosted: Wed Feb 06, 2008 1:04 am     Reply with quote
Dear CCS members,

Take a look at the following code (Full code here):

Code:

#INT_TIMER1
void timer_irq()
{
    set_timer1(preload);
   
   if (Intcount < 255)
    {
      if (Intcount == red_duty)
       {
         output_low(red);
       }   
      if (Intcount == green_duty)
       {
         output_low(green);
       }   
      if (Intcount == blue_duty)
       {
         output_low(blue);
       }   
    }
   
   else if(Intcount == 255)
    {
      Intcount = 0;
      output_high(red);
      output_high(green);
      output_high(blue);   
    }   
    Intcount++;
}



Is there a way to skip the remaining Intcount++; code when i reset it to 0 better (more efficient way) than doing :

Code:

   else if(Intcount == 255)
    {
      restart_pwm = 1;
      output_high(pin_a0);
      output_high(pin_a1);
      output_high(pin_a2);
    }   
    Intcount++;
    if(restart_pwm==1){
    Intcount=0;
    restart_pwm = 0;
    }
}

... Like exiting the current interrupt so it would not run the rest of the interrupt code for this time only thus having a real 0 value for Intcount instead of resetting it to 0 then increasing to 1 after.


Just curious!

Best Regards,

Laurent
Foppie



Joined: 16 Sep 2005
Posts: 138
Location: The Netherlands

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PostPosted: Wed Feb 06, 2008 1:24 am     Reply with quote
Why not just delete the line Intcount = 0; ?

This way the Intcount will overflow to 0. (as long as it is an int)

It is not the most dynamic approach, but it works in this case.
ELCouz



Joined: 18 Jul 2007
Posts: 427
Location: Montreal,Quebec

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PostPosted: Wed Feb 06, 2008 1:32 am     Reply with quote
Thanks !

I never thought of that.

Laurent
D-Kens



Joined: 09 May 2005
Posts: 35
Location: Toulouse (France)

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PostPosted: Wed Feb 06, 2008 2:13 am     Reply with quote
Guess you could also have included your "Intcount++" into the 'if(Intcount<255)', thus increasing only as long as your below 255...

Wink
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