From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: wcall@domain.hid
Cc: 'Xenomai help' <xenomai@xenomai.org>
Subject: Re: [Xenomai-help] xenomai i2c
Date: Thu, 22 Jan 2009 22:02:44 +0100 [thread overview]
Message-ID: <4978DEF4.9080807@domain.hid> (raw)
In-Reply-To: <001501c97cd2$892353e0$9b69fba0$@com>
Wayne Call wrote:
> Is it possible to read the /sys/bus/i2c/devices/0-0048/temperature
> file using rt_dev_read? The application is running in the real time
> context. Even though the device driver is not in the real time
> context, can an application running in the real time context just
> simple access the /sys/bus/i2c/devices files using rt_dev_read and
> rt_dev_write? The /sys is where the sysfs has been mounted.
No, rt_dev_read/rt_dev_write is for devices created using the RTDM skin,
not for Linux devices or files. When an application running in real-time
context (that is, in primarey mode) reads a Linux file, it switches to
secondary mode, that is to say, it becomes a plain linux task with linux
induced latencies.
--
Gilles.
next prev parent reply other threads:[~2009-01-22 21:02 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1231007816-1232652648-cardhu_decombobulator_blackberry.rim.net-1405832660-@domain.hid>
2009-01-22 19:33 ` [Xenomai-help] xenomai i2c Gilles Chanteperdrix
2009-01-22 20:46 ` Wayne Call
2009-01-22 21:02 ` Gilles Chanteperdrix [this message]
2009-01-22 18:09 Wayne Call
2009-01-22 19:16 ` Gilles Chanteperdrix
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