From owner-freebsd-hardware Sat May 16 02:53:11 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id CAA20499 for freebsd-hardware-outgoing; Sat, 16 May 1998 02:53:11 -0700 (PDT) (envelope-from owner-freebsd-hardware@FreeBSD.ORG) Received: from post.mail.demon.net (post-12.mail.demon.net [194.217.242.41]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id CAA20494 for ; Sat, 16 May 1998 02:53:04 -0700 (PDT) (envelope-from dmlb@ragnet.demon.co.uk) Received: from (ragnet.demon.co.uk) [158.152.46.40] by post.mail.demon.net with smtp (Exim 1.82 #2) id 0yadeL-00024k-00; Sat, 16 May 1998 10:53:05 +0100 Received: from dmlb by ragnet.demon.co.uk with local (Exim 1.73 #1) id 0yabzn-0007F9-00; Sat, 16 May 1998 09:07:07 +0100 Message-ID: X-Mailer: XFMail 1.2 [p0] on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: Date: Sat, 16 May 1998 09:07:04 +0100 (BST) From: Duncan Barclay To: "Matthew N. Dodd" Subject: RE: interesting stuff Cc: freebsd-hardware@FreeBSD.ORG Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On 15-May-98 Matthew N. Dodd wrote: > > Computer Serial port Thermometer > http://www.spiderplant.com/hlt/index.html > > Serial/I2C LCD displays > http://www.telusplanet.net/public/matrixoc/ > > I2C FAQ > http://www.paranoia.com/%7Efilipg/HTML/LINK/ELE/F_I2C.html > > So... Anyone wanna do a generic multi I2C bus to RS-232 adapter (at least > 19.2k)? It's usually easier to do these on the parallel port (god knows how many phase locked loops I've programmed down that!). One "problem" with the I2C is that it is not a TTL compatible bus, so a bit of hardware is need to convert the logic levels. Secondly, the framing on the I2C bus doesn't lend itself well to UART style parity/start/stop bits. I would suggest that a parallel port driver be plugged into the ppbus framework. It owuld be something I would find useful at work! --- ________________________________________________________________________ Duncan Barclay | God smiles upon the little children, dmlb@ragnet.demon.co.uk | the alcoholics, and the permanently stoned. ________________________________________________________________________ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message