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Double interrupt doesnt work

 
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rikotech8



Joined: 10 Dec 2011
Posts: 376
Location: Sofiq,Bulgariq

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Double interrupt doesnt work
PostPosted: Wed Dec 11, 2013 3:37 am     Reply with quote
Hello Guys! I am trying to create a code that should respond on two pin interrupt H2L edge.The first interrupt is INT_RB7_H2L and second one is INT_RA5_H2L. The problem is that only one works, depends on which one has bigger priority. I simplified the code for easily understanding the issue.
Here is the code:
Code:

#include <16F1508.h>
#fuses NOWDT,NOMCLR,INTRC_IO
#use delay(clock=16M)

#define valves pin_c5
#PRIORITY INT_RA,INT_RB

#INT_RA
   void dec_button()
      {
         if (!input(pin_A5))
            {
               output_high(valves);
            }
      clear_interrupt(INT_RA5_H2L);
      }

#INT_RB
   void inc_button()
      { 
         if(!input(pin_b7))
            {
               output_low(valves);
            }
      clear_interrupt(INT_RB7_H2L);
      }

void main()
{
   ENABLE_INTERRUPTS(INT_RA5_H2L);
   ENABLE_INTERRUPTS(INT_RB7_H2L);
   ENABLE_INTERRUPTS(GLOBAL);

   while(true)
      ;
}

Sorry for bad English!
Thanks in advance! Very Happy
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A person who never made a mistake never tried anything new.
Ttelmah



Joined: 11 Mar 2010
Posts: 19509

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PostPosted: Wed Dec 11, 2013 9:38 am     Reply with quote
The compiler clears the physical interrupt for you - so get rid of the line doing this.
However what it doesn't do is clear the IOCB flags. These are a set of flags to say 'which pin' triggered the interrupt.

Add this:
Code:

#byte IOCAF = 0x393
#byte IOCBP = 0x394
#define clear_IOCA_flags() IOCAF = 0
#define clear_IOCB_flags() IOCBF = 0


and call these functions (IOCA for INT_RA, and IOCB for INT_RB), instead of the clear_interrupt line.

So:
Code:

#INT_RA
void dec_button(void)
{
     if (!input(pin_A5))
     {
          output_high(valves);
     }
     clear_IOCA_flags();
}


Best Wishes
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