WH Tan wrote:

> I see you have experienced some problem with PIC interrupt - from
> initially USART to now external INT.  Have you considered to
> experiment with a timer interrupt instead?  I think a timer is more
> easier to set up since it doesn't depend on external event.  And it
> much more simple to test it in MPLAB SIM.

I have tested my code in MPLAB SIM (under wine), and found it working.

After some googling about PIC and interrupts problems, I have found
the following:
http://www.motherboardpoint.com/t93255-interrupt-not-firing-on-pic18f.html

I checked that in my code (based on the Bradley Minch's USB firmware) I had
the _DEBUG_ON_4L option set. After I replaced it with _DEBUG_OFF_4L,
the interrupts
started to work!

I'm quite surprised, that setting of this option breaks interrupts...
In the datasheet (39632D.pdf) there is nothing about it...
-- 
Regards, Wojtek
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