[Amforth-devel] Interrupt handling question

[<ha...@hu...>]

Hi,

I am trying to port my timer interrupt driven display code to
amforth-1.9 and have some problems with that.

On the documentation page
(http://amforth.sourceforge.net/interrupts.php), an example interrupt
handler is printed:

: doint1
    . ( <-- this is dangerous in interrupts )
;

The danger set aside (I guess the dangerous part is the fact that the
UART will generate another interrupt that may not be properly
handled), it seems that this example has a stack effect.  Is this
intended?  Is there something on the stack that the interrupt handler
must remove?

I am asking because my code crashes - If I leave the stack as it was
before entering the interrupt handler, I see periodic reboots (once a
second) when I enable the interrupt handler.  If I pop the topmost
item, amforth plain crashes with trash characters written to the
console.  It could be that the new interrupt handler code is too slow
to work with the timer interrupt, but before getting into debugging
that, I'd like to know if there is something fundamentally wrong with
my code.

BTW:  Is there anything in amforth except ISTORE that writes to flash?
 I am asking because I want to give amforth on a flashless AVR a try.

Thanks!
-Hans