[ECOS] How to handle IRQ0 interrupt?

[Paul D. DeRocco]

> From: Neeraja
> 
>     I am working on at91rm9200 board. I want to catch the 
> interrupt when the button is pressed which is connected to IRQ0 line.
>   But what is happening is that when I run the application 
> the interrupt isr is being called always irrespective of the 
> button press. 

Do you mean it interrupts over and over, and never leaves time for the
application? This can happen if it's programmed to be level-sensitive
instead of edge-sensitive.

Also, remember that mechanical switches need debouncing. This is why I
prefer polling switches at a 10ms-20ms rate, since that's fast enough for
human input, and slow enough not to see the bounce.

-- 

Ciao,               Paul D. DeRocco
Paul                mailto:pderocco@ix.netcom.com


-- 
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss