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How can I use External interrupt

 
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sindyvirgo



Joined: 15 Jan 2009
Posts: 8

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How can I use External interrupt
PostPosted: Wed Oct 07, 2009 7:17 am     Reply with quote
How can I use External interrupt ?

I have a function when my button RB0(INT0) to press that my LED can work.

That my code ...
Code:

#int_EXT
EXT_isr()
{
   output_low(pin_a2);     //LED
}

void main()
{
   ext_int_edge( H_TO_L );
   enable_interrupts(INT_EXT);
   enable_interrupts(GLOBAL);

   for(;;)
  {
         printf("Test");
  }
}

Please help me to do this code thanks !!
bkamen



Joined: 07 Jan 2004
Posts: 1611
Location: Central Illinois, USA

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PostPosted: Wed Oct 07, 2009 10:16 am     Reply with quote
You're doing that backwards.

You want the INT_EXT to monitor your button.
Toss out a flag to a main routine that say the button has been tripped and then with that flag, execute code that debounces the button and then checks for its valid states.

THEN, depending on that state, set your LED accordingly.

If that's all you're doing, it probably doesn't need to be interrupt driven.


-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D
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