Date: Fri, 10 May 2002 16:17:22 -0500 (CDT) From: John Utz <john@utzweb.net> To: Jai Dhar <jdhar@omega.focalnetworks.net> Cc: freebsd-hardware@FreeBSD.ORG Subject: Re: Parallel port writing Message-ID: <Pine.LNX.4.44.0205101616330.4473-100000@jupiter.linuxengine.net> In-Reply-To: <20020510171451.W42862-100000@omega.focalnetworks.net>
next in thread | previous in thread | raw e-mail | index | archive | help
i'd suggest looking for a tutorial for accessing devices in FreeBSD, because i am not even sure that my assertion is correct. On Fri, 10 May 2002, Jai Dhar wrote: > > I'm in the process of learning a lot of C's IO commands, so could you tell > me how I would use that? (I'm more into circuits, haven't really explored > the interfacing part until now, heh) > Thanx > > On Fri, 10 May 2002, John Utz wrote: > > > ok, one more suggestion. > > > > the code fragment isnt sufficient i think. doesnt it need an open() on the > > device? > > > > On Fri, 10 May 2002, Jai Dhar wrote: > > > > > > > > /dev/ppi0 -> /dev/ppi2 does exist :p > > > For those who are reading, I'm testing via a simple Led circuit.. led > > > connected to data pin one and grounded via ground pins. I'm also using the > > > code snippet used in 'man ppi'. > > > > > > On Fri, 10 May 2002, John Utz wrote: > > > > > > > how about the device in the dev dir? > > > > > > > > ls /dev/ppi doesnt exist on my box, and i am unsure as to how to create > > > > it. > > > > > > > > that's my last idea, best 'o luck! > > > > > > > > > > > > On Fri, 10 May 2002, Jai Dhar wrote: > > > > > > > > > > > > > > device ppc0 at isa? irq 7 > > > > > device ppbus > > > > > device lpt > > > > > device ppi > > > > > > > > > > All there > > > > > > > > > > On Fri, 10 May 2002, John Utz wrote: > > > > > > > > > > > do you have the device in the kernel? i've never gave it any thought, but > > > > > > wouldnt you need device ppi built in? > > > > > > > > > > > > i dont know, i am just guessing.... > > > > > > > > > > > > On Fri, 10 May 2002, Jai Dhar wrote: > > > > > > > > > > > > > I am root, lpd isn't running, and as for ppi.. I tried their exact code > > > > > > > that they have in 'man ppi', and still doesn't work??? > > > > > > > > > > > > > > > > > > > > > On Fri, 10 May 2002, John Utz wrote: > > > > > > > > > > > > > > > you arent root? > > > > > > > > > > > > > > > > or, more likely, lpd owns it! > > > > > > > > > > > > > > > > On Fri, 10 May 2002, Jai Dhar wrote: > > > > > > > > > > > > > > > > > I have a question about writing to parallel ports. > > > > > > > > > I am trying to make a basic C program to write simple data to a parallel > > > > > > > > > port, but when I try, I get an error on opening /dev/lpt0 as "Device Busy" > > > > > > > > > I tried echo 255 > /dev/lpt0, and also got "Device Busy". When looking at > > > > > > > > > all my processes, I didn't see anything that visibly took control of > > > > > > > > > /dev/lpt0. In dmesg, I get both ppc0 and lpt0 detected with an IRQ and IO > > > > > > > > > address fine. What could be wrong? Thank you > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > > > > > > > > > with "unsubscribe freebsd-hardware" in the body of the message > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > > > > > > > > > > > > > John L. Utz III > > > > > > > > john@utzweb.net > > > > > > > > > > > > > > > > Idiocy is the Impulse Function in the Convolution of Life > > > > > > > > > > > > > > > > > > > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > > > > > > > > with "unsubscribe freebsd-hardware" in the body of the message > > > > > > > > > > > > > > > > > > > > > > > > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > > > > > > > with "unsubscribe freebsd-hardware" in the body of the message > > > > > > > > > > > > > > > > > > > -- > > > > > > > > > > > > John L. Utz III > > > > > > john@utzweb.net > > > > > > > > > > > > Idiocy is the Impulse Function in the Convolution of Life > > > > > > > > > > > > > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > > > > > > with "unsubscribe freebsd-hardware" in the body of the message > > > > > > > > > > > > > > > > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > > > > > with "unsubscribe freebsd-hardware" in the body of the message > > > > > > > > > > > > > -- > > > > > > > > John L. Utz III > > > > john@utzweb.net > > > > > > > > Idiocy is the Impulse Function in the Convolution of Life > > > > > > > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > > > > with "unsubscribe freebsd-hardware" in the body of the message > > > > > > > > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > > > with "unsubscribe freebsd-hardware" in the body of the message > > > > > > > -- > > > > John L. Utz III > > john@utzweb.net > > > > Idiocy is the Impulse Function in the Convolution of Life > > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hardware" in the body of the message > -- John L. Utz III john@utzweb.net Idiocy is the Impulse Function in the Convolution of Life To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.LNX.4.44.0205101616330.4473-100000>