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pin specific interrupt

 
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prestonee



Joined: 21 Jan 2011
Posts: 1

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pin specific interrupt
PostPosted: Fri Jan 21, 2011 4:09 pm     Reply with quote
I understand how the Port specific interrupt works, but I want a pin specific interrupt on change.

This was generated automatically by the wizard:
Code:

#int_EXT
void  EXT_isr(void)
{
// Call LED routine
// clear flag
}

But I believe this is a general if any pin changes interrupt?
If I wish the interrupt to be specific to A2 on pic 16f1823, is there something else to add?

Can I state just #int_EXTRA2 as that 1st line?
temtronic



Joined: 01 Jul 2010
Posts: 9225
Location: Greensville,Ontario

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PostPosted: Fri Jan 21, 2011 5:26 pm     Reply with quote
You HAVE to read the info on the PIC you're using! Check the chapters on the physical pins and their uses, also the section on Interrupts.
The newer PICs have more 'options', but you'll have to read the information. I'm currently using the PIC16F88 and it doesn't have individually addressable interrupt capability (though a few lines of code can accomplish it...).
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Jan 21, 2011 5:45 pm     Reply with quote
Quote:
Can I state just #int_EXTRA2 as that 1st line?

You can't invent stuff. Look at the end of the 16F1823.h file for a list
of allowable interrupt directives.


Quote:

#int_EXT
void EXT_isr(void)
{
}

But I believe this is a general if any pin changes interrupt?

It's for pin A2 only.
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