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Date: Wed, 09 May 2007 08:30:06 +0200
From: Jan Kiszka <jan.kiszka@domain.hid>
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Subject: Re: [Xenomai-help] rtser not showing up
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To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: xenomai@xenomai.org

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Gilles Chanteperdrix wrote:
> Brandt Erickson wrote:
>  >=20
>  > > No node will turn up in /dev, you will find the list of available =
RTDM
>  > > devices in /proc/xenomai/rtdm/named_devices.
>  >=20
>  > Okay,
>  > there is a /proc/xenomai/rtdm/rtser0.  The example opens the file
>  > "rtser0", does this default to the full path name when I use
>  > rt_dev_open?
>  >=20
>  > Right now, it appears I can open the file (rt_dev_open returns 0) an=
d
>  > configure the serial port (using rt_dev_ioctl), however, every call =
to
>  > rt_dev_write returns -1.  I'm using the configuration from the examp=
le
>  > code which basically has everything set to defaults.  Is there an
>  > equivalent of errno I can get to find out what's going wrong?  Thank=
s.
>  > -Brandt
>=20
> The errors of the serial driver are documented here:
>=20
> http://www.xenomai.org/documentation/trunk/html/api/group__rtserial.htm=
l
>=20
> -1 is -EPERM... which is not documented. -EPERM probably means that you=

> are trying to use a real-time call from a non real-time thread. See
> rt_task_shadow or rt_task_create.
>=20

That's the point. The serial driver's write operation requires real-time
context and return -EPERM otherwise. Documentation should be enhanced...

Jan


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