Date: Thu, 11 Jan 1996 07:28:38 -0700 From: kelly@fsl.noaa.gov (Sean Kelly) To: charlie_conklin@il.us.swissbank.com Cc: questions@freebsd.org, doc@freebsd.org Subject: Re: lpt driver question Message-ID: <9601111428.AA04075@emu.fsl.noaa.gov> In-Reply-To: <9601111144.AA01349@ln1d279nwk> (message from Charlie Conklin on Thu, 11 Jan 96 11:44:15 GMT)
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>>>>> "Charlie" == Charlie Conklin <charlie_conklin@il.us.swissbank.com> writes:
Charlie> Hello all... I have a simple piece of hardware that sits
Charlie> on the PC printer port. I also have some C source code
Charlie> that compiles and works, and is used to talk to that
Charlie> hardware. The code looks fairly simple, basically just
Charlie> poking a few values at an io port.
Charlie> I am now faced with the task of making the hardware work
Charlie> under FreeBSD instead of windows, and I realize that I do
Charlie> not have the foggiest notion of how to proceed!
You might want to examine /sys/i386/isa/tw.c; that's a device driver
that uses the parallel port to talk to an X-10 TW523 power controller.
It'd be nicer if it were a loadable kernel module, which is probably
what you want your driver to be.
There's supposed to be a guide to writing device drivers as part of
the FreeBSD handbook, but I just checked the web site and it wasn't
there. Does anyone know the status of this document?
--
Sean Kelly
NOAA Forecast Systems Laboratory, Boulder Colorado USA
Even though I was their captive, the Indians allowed me quite a bit of freedom.
I could walk about freely, make my own meals, and even hurl large rocks at
their heads. It was only later that I discovered they were not Indians at all,
but dirty clothes hampers. -- Deep Thoughts, by Jack Handey
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