From: Peter Svensson <petersv@psv.nu>
To: Eric Lammerts <eric@lammerts.org>
Cc: Uwe Reimann <linux-kernel@pulsar.homelinux.net>,
<linux-kernel@vger.kernel.org>
Subject: Re: Direct access to parport
Date: Wed, 5 Mar 2003 07:49:23 +0100 (CET) [thread overview]
Message-ID: <Pine.LNX.4.44.0303050746220.16313-100000@cheetah.psv.nu> (raw)
In-Reply-To: <Pine.LNX.4.52.0303042329450.18334@ally.lammerts.org>
On Tue, 4 Mar 2003, Eric Lammerts wrote:
> On Tue, 4 Mar 2003, Uwe Reimann wrote:
> > I'd like to connect some self made hardware to the parallel port and
> > read the values of the dataline using linux. Can this be done in
> > userspace or do I have to write kernel code to do so? I'm currently
> > thinking of writing a device like lp, which in turn uses the parport
> > device. Does this sound like a good idea?
>
> >From userspace it's quite simple:
[ioperm-based suggestion removed]
A better idea may be to use ppdev - the portable and safe way to access a
paralell port directly. This driver is in the stock kernels. This prevents
races between the kernel and userland over control for the paralell port.
Peter
--
Peter Svensson ! Pgp key available by finger, fingerprint:
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------------------------------------------------------------------------
Remember, Luke, your source will be with you... always...
next prev parent reply other threads:[~2003-03-06 11:48 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-04 8:15 Direct access to parport Uwe Reimann
2003-03-04 22:31 ` Eric Lammerts
2003-03-05 6:49 ` Peter Svensson [this message]
2003-03-05 11:24 ` Dmitrii Tisnek
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