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Date:      Fri, 16 Apr 1999 19:19:23 +0900
From:      Tsuyoshi Iguchi <zinnia@jan.ne.jp>
To:        nox@jelal.kn-bremen.de
Cc:        tanimura@naklab.dnj.ynu.ac.jp, freebsd-hackers@freebsd.org, freebsd-multimedia@freebsd.org
Subject:   Re: Call for Review: Voxware midi driver for serial ports
Message-ID:  <199904161122.UAA08044@jan-wc.jan.ne.jp>
In-Reply-To: Your message of "Thu, 15 Apr 1999 20:33:07 %2B0200" <19990415203307.A33640@saturn.kn-bremen.de>
References:  <19990415203307.A33640@saturn.kn-bremen.de>

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From: Juergen Lock <nox@jelal.kn-bremen.de>
Subject: Re: Call for Review: Voxware midi driver for serial ports
Date: Thu, 15 Apr 1999 20:33:07 +0200

> Hmm as 38.4kbps is > 31.25kbps, does the driver respect flow control
> when sending?

If CTS is off when the driver is about to sending,
transfer is expected to be disabled by hardware.
So THRE -- transmission holding register empty -- flag
should be off, then the interrupt routine of the driver
is forced to stop sending.

( Since I don't have much confidence about the hardware mechanism of sio,
  please point out any errors to me. )

-----
Tsuyoshi Iguchi (zinnia@jan.ne.jp)
http://www.eie.yz.yamagata-u.ac.jp/~a95516/zinnia/index.shtml


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