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Date: Tue, 02 Dec 2008 18:12:35 +0100
From: Jan Kiszka <jan.kiszka@domain.hid>
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Subject: Re: [Xenomai-help] Calling comedi from a RT task
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To: =?ISO-8859-1?Q?Patrick_Gr=E4bel?= <graebel@domain.hid>
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Patrick Gr=E4bel wrote:
> Hi,
>=20
> I am using Xenomai 2.3.1 and comedi with driver "ni_pcimio". I am able
> to create a RT task that triggers each msec. But calling the comedi API
> kicks me out of RT as indicated by /proc/xenomai/stat (column MSW). The
> modules loaded are:
>=20
> comedi_fc   3584 1 ni_pcimio
> kcomedilib 20868 0
> comedi     33248 6 ni_pcimio, ni_tio, comedi_fc, mite, 8255, kcomedilib
> licModule  44272 1 kcomedilib
>=20
> The comedi modules are from a 2.6.20-14-ipipe/comedi/driver directory.
> How do I use the comedi API so that the task will stay realtime? What d=
o
> I have to check?

You should have a look at the RT-capable comedi stack that currently
only lives in Xenomai SVN trunk. How to get your device supported by
that stack, ie. how to port the existing driver to RT-comedi, that's
something Alexis can tell you more about. And/or have a look at the fake
and loop drivers that are already included.

Jan

--=20
Siemens AG, Corporate Technology, CT SE 2 ES-OS
Corporate Competence Center Embedded Linux