Re: [Xenomai-help] Calling comedi from a RT task

[Jan Kiszka <jan.kiszka@domain.hid>]

Patrick Gräbel wrote:
> Hi,
> 
> 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:
> 
> 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
> 
> 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 do
> 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

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