From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <4410911F.4070507@domain.hid>
Date: Thu, 09 Mar 2006 21:33:35 +0100
From: Jan Kiszka <jan.kiszka@domain.hid>
MIME-Version: 1.0
Subject: Re: [Xenomai-core] RTDM and Timer functions
References: <200603091443.25714.lbocseg@domain.hid>
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To: Rodrigo Rosenfeld Rosas <lbocseg@domain.hid>
Cc: xenomai-core <xenomai@xenomai.org>

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Rodrigo Rosenfeld Rosas wrote:
> Hi Jan,
>=20
> I'm still concerned about the future of RTDM and timer functions. I thi=
nk=20
> there should be some function for starting the timer manually, since th=
e=20
> automatic feature don't work great for RTDM drivers.
>=20
> It is not nice to have to run the latency (or any other) program for st=
arting=20
> the timer before I can load my driver. And it is not suffice to run it =
once I=20
> booted. After I open/close my rtdm device and reload my driver the prob=
lem=20
> will occur again and I'll have to re-run the latency program.
>=20

Sorry I don't see the problem here.

# modprobe xeno_nucleus; cat /proc/xenomai/timer
status=3Doff:setup=3D1392:tickval=3D0:jiffies=3D0

# modprobe xeno_rtdm; cat /proc/xenomai/timer
status=3Doneshot:setup=3D1392:tickval=3D1:jiffies=3D8113917792696

So the timer is running right since when rtdm is loaded?!

And that simple heartbeat rtdm example on my rt-addon homepage now
cleanly runs even without any further helper to start some timer.

> Do you have any plans to correct this undesirable behaviour?
>=20
> I don't even have an idea why the timer stops once it is started... Act=
ually=20
> I'm not sure why does rtdm_clock_read should depend on the xenomai time=
r. At=20
> least, I think there should be a note in the rtdm_clock_read documentat=
ion=20
> stating that it only works after the timer has been started.
>=20
> Best Regards,
>=20
> Rodrigo.
>=20

Jan


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