From: Thomas Gleixner <tglx@linutronix.de>
To: Forconi <forconi@wavecomm.it>
Cc: linux-rt-users@vger.kernel.org
Subject: Re: RT_PREEMPT with RS232 and USB-RS232 adapter
Date: Wed, 25 Jan 2012 11:56:15 +0100 (CET) [thread overview]
Message-ID: <alpine.LFD.2.02.1201251153260.2716@ionos> (raw)
In-Reply-To: <38e80508-f150-4e9a-b0d4-303a391e8007@zmail.sgconsulting.it>
On Thu, 19 Jan 2012, Forconi wrote:
> I'm working on an RT_PREEMPT patched kernel to test a small C
> program that sends 39B of data on the serial line every 50ms.
> I'm testing the timing accuracy using a scope on the TX pin of the
> serial cable.
> When I run the application using /dev/ttyS0 as serial port I see
> data starting every 50ms, but when I run the application using a
> Prolific PL2303 USB-RS232 adapter on /dev/ttyUSB0 I see data out
> every 250ms.
> Is this possible or I'm doing something wrong?
Why do you expect that USB is in any way deterministic?
next prev parent reply other threads:[~2012-01-25 10:56 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <f599ebee-26a6-4db9-a47a-58524ee29b99@zmail.sgconsulting.it>
2012-01-19 10:34 ` RT_PREEMPT with RS232 and USB-RS232 adapter Forconi
2012-01-25 10:56 ` Thomas Gleixner [this message]
[not found] <ed1899ce-3cdb-4826-8a35-8b0e9ae1ed01@zmail.sgconsulting.it>
2012-01-19 11:08 ` Forconi
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=alpine.LFD.2.02.1201251153260.2716@ionos \
--to=tglx@linutronix.de \
--cc=forconi@wavecomm.it \
--cc=linux-rt-users@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox