Re: DIO Change Detection

From: edouard charvet <edouard.charvet_at_fr.thalesgroup.com> · Date: Fri, 07 Oct 2005 09:34:11 +0200

ni6527 can do this. You can choose which line should generate an interrupt
and which should not and on what kind of edge (rising and/or falling).
However, once an interrupt is caught, you have to manually scan all your
input lines to find which one had changed.

In user space, you set this through a command call and then all you have to
do is to wait on the file descriptor linked to the device.

regards,

Edouard

"Calin A. Culianu" a écrit :

> Does anyone know of any Comedi-supported board that can do DIO change
> detection (in order words, generate an interrupt to the CPU whenever
> digital input lines change state)?
>
> I know some boards out there can do this, but :
>
> 1. It isn't immediately obvious to me that the comedi_cmd interface can
> clearly express this..
>
> 2. Even so, do any comedi drivers support this feature on any boards that
> my have this as a feature?
>
> -Calin
>
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