From owner-freebsd-questions  Wed Dec  6 15:52:09 1995
Return-Path: owner-questions
Received: (from root@localhost)
          by freefall.freebsd.org (8.7.3/8.7.3) id PAA07428
          for questions-outgoing; Wed, 6 Dec 1995 15:52:09 -0800 (PST)
Received: from hda.com (hda.com [199.232.40.182])
          by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id PAA07351
          for <questions@FreeBSD.org>; Wed, 6 Dec 1995 15:51:58 -0800 (PST)
Received: (from dufault@localhost) by hda.com (8.6.11/8.6.9) id SAA10511; Wed, 6 Dec 1995 18:55:24 -0500
From: Peter Dufault <dufault@hda.com>
Message-Id: <199512062355.SAA10511@hda.com>
Subject: Re: lpt0 modifications
To: jivko@ijs.com
Date: Wed, 6 Dec 1995 18:55:23 -0500 (EST)
Cc: questions@FreeBSD.org
In-Reply-To: <199512061848.KAA09181@freefall.freebsd.org> from "jivko@ijs.com" at Dec 6, 95 10:48:21 am
X-Mailer: ELM [version 2.4 PL24]
Content-Type: text
Sender: owner-questions@FreeBSD.org
Precedence: bulk

> 
> I hope this question will not be too much of a trouble for 
> you, I have spent some time looking around the documentation
> and could not find answer for it myself so here goes:
> 
> I owuld like to use the Paralel Prot of a FreeBSD running 
> machine to control another very simple device which is not a
> printer. The interface to that device, however, is not
> compatible with the interface to a printer and does not 
> support the hardware hand-shake protocol a normal printer 
> would do. Is there a way I could reconfigure the kernel 
> respectively the /dev/lpt0 device to ignore those errors and
> simply dump numbers to the parallel port? It has to be 
> something very simple, but I don't seem to be able to find 
> it.,

I did something like this a while back (386bsd) to drive a stepper
motor.  I can dig up the driver but you'll have to fold it in as
I don't have much time right now.  It will even do trapezoidal
profiling for you.

Will opening /dev/io and doing outbs directly to the data port from
your user process work for this application?

--
Peter Dufault               Real Time Machine Control and Simulation
HD Associates, Inc.         Voice: 508 433 6936
dufault@hda.com             Fax:   508 433 5267