From: mrc <j.marincic@imotec.nl>
To: linux-serial@vger.kernel.org
Subject: Serial communication under real-time Timesys Linux
Date: Thu, 20 Jan 2005 11:09:10 +0100 [thread overview]
Message-ID: <41EF8346.8020300@imotec.nl> (raw)
We are running hard RT and soft RT process under realtime OS Timesys
Linux on the industrial PC. Hard RT process has a 1 milisecond period
and soft RT runs with 300 milisecond period.
The Soft RT process is accessing the serial RS422 port and the driver
used is the Linux serial driver. (We have an RS422 card and the driver
is slightly modified by the manufacturer, but it is based on the Linux
driver).
The serial communication affects hard RT process performance which
results in its overruns. We suspect that the problem is in the serial
communication driver - either the interrupt routine is not preemptible
or the problem is that it uses jiffies or something else.
Does anyone know if there is a real-time serial driver available? Did
anyone have experience with Timesys Linux?
Thanks in advance.
next reply other threads:[~2005-01-20 10:07 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-20 10:09 mrc [this message]
-- strict thread matches above, loose matches on Subject: below --
2005-01-20 9:57 Serial communication under real-time Timesys Linux J. Marincic
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