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Int_RA

 
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SerialGmr8



Joined: 30 Nov 2007
Posts: 13

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Int_RA
PostPosted: Thu Jan 31, 2008 1:50 pm     Reply with quote
Hello all,

I've been trying to use the interrupt on change on the port A pins, but the compiler states that it doesnt recognise "#define int_ra".

Im using PCW Compiler versions 4.057.

my code is as follows:

Code:


 #include <16F877A.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)


int8 value = 0;

#INT_RA
void portchange_isr ()
{
 value= input(PIN_A0);
}

void main()
{
   output_low(pin_c5);
   enable_interrupts(GLOBAL);
   enable_interrupts(INT_RA);
 
 while(1)
      {
       if(value == 0)
            {
             output_low(PIN_C5);
            }
       else
            {
             output_high(PIN_C5);
            }
      }     
}




I've used the same code as above for port b, except that I change int_ra to int_rb in both lines and it works fine...

can anyone please advise ?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Jan 31, 2008 2:33 pm     Reply with quote
Quote:

I've used the same code as above for port b, except that I change int_ra to int_rb in both lines and it works fine...


Look in the 16F877A.H file. There is a list of available interrupts at the
end of the file.
Quote:
c:\Program Files\picc\Devices\16F877A.h


Download the 16F877A data sheet:
http://ww1.microchip.com/downloads/en/DeviceDoc/39582b.pdf
Look at this section, on page 43 in the Acrobat reader:
Quote:
4.1 PORTA and the TRISA Register

Do you see any place where it says that Port A has interrupt-on-change ?
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