From owner-freebsd-hackers@FreeBSD.ORG Sat Oct 22 06:31:41 2005 Return-Path: X-Original-To: freebsd-hackers@freebsd.org Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 36FB716A41F for ; Sat, 22 Oct 2005 06:31:41 +0000 (GMT) (envelope-from doconnor@gsoft.com.au) Received: from cain.gsoft.com.au (cain.gsoft.com.au [203.31.81.10]) by mx1.FreeBSD.org (Postfix) with ESMTP id 9064243D45 for ; Sat, 22 Oct 2005 06:31:38 +0000 (GMT) (envelope-from doconnor@gsoft.com.au) Received: from inchoate.gsoft.com.au (ppp224-132.lns2.adl4.internode.on.net [203.122.224.132]) (authenticated bits=0) by cain.gsoft.com.au (8.13.4/8.13.4) with ESMTP id j9M6VPxI005636 (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=NO); Sat, 22 Oct 2005 16:01:26 +0930 (CST) (envelope-from doconnor@gsoft.com.au) From: "Daniel O'Connor" To: freebsd-hackers@freebsd.org, ticso@cicely.de Date: Sat, 22 Oct 2005 16:00:59 +0930 User-Agent: KMail/1.8.2 References: <200510210835.j9L8Zn2P001846@pinky.frank-behrens.de> <20051021203948.GQ31913@cicely12.cicely.de> In-Reply-To: <20051021203948.GQ31913@cicely12.cicely.de> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart19483092.JvN0611cXl"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit Message-Id: <200510221601.07346.doconnor@gsoft.com.au> X-Spam-Score: 0.05 () FORGED_RCVD_HELO X-Scanned-By: MIMEDefang 2.51 on 203.31.81.10 Cc: Frank Behrens Subject: Re: How disable attachment of sio(4) driver to device? X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 22 Oct 2005 06:31:41 -0000 --nextPart19483092.JvN0611cXl Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline On Sat, 22 Oct 2005 06:09, Bernd Walter wrote: > I personally build specialized USB and Ethernet devices for doing > Modbus/RTU RS485 timing. We use 9 bit data RS485 (the ninth bit is used as an address mark so=20 microcontrollers can sleep until it turns up then check if it's addressed t= o=20 it and go back to sleep). I have been told it could be implemented as a line discipline but I am not = so=20 sure (since to do 9 bit transmition you need to change between mark & space= =20 parity on a byte by byte basis) We (well msmith originally) implemented it as a cut down hacked up copy of = sio=20 =2D this IS suboptimial so I think I'll have a look at implementing it via= =20 uart. =2D-=20 Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C --nextPart19483092.JvN0611cXl Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQBDWdyr5ZPcIHs/zowRAvZxAJ9AHmxao4hf0cjQl4nNNITSxC2FtgCffJGk N2AnORjfJuXzcnWo45U3WK4= =/pc1 -----END PGP SIGNATURE----- --nextPart19483092.JvN0611cXl--