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Date: Sun, 27 Oct 2002 09:22:01 -0800 (PST)
From: David Nicholas Kayal <davek@saturn5.com>
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To: nbari@unixmexico.com
Cc: freebsd-hackers@FreeBSD.ORG
Subject: Re: i am looking for a 5 volt signal
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Shouldn't the fact that the signal is in a while loop keep the 5 volt
signal going?  Isn't the parallel port being blasted with the
value 255 over and over again?

The serial port will not fulfill what i am ultimately trying to achive. I
am trying to have the parallel port to control 8 relays each turing
on/off based upon which bit i send out to the port.

On Sun, 27 Oct 2002 nbari@unixmexico.com wrote:

> try using also the serial port and a logical buffer
>
> the 5 volt signal is very fast and your multimeter is maybe not to fast
>
> > I'm looking for a 5 volt signal.
> >
> > I have wires plugged into pins 2 and 25 of the parallel port.
> >
> > I have written a small program:
> >
> > #include <stdio.h>
> > #include <dev/ppbus/ppi.h>
> > #include <dev/ppbus/ppbconf.h>
> >
> > int main()
> > {
> >   int fd;
> >   while(1)
> >     {
> >       ioctl(fd, PPISDATA, 255);
> >     }
> > }
> >
> > and have it executing...
> >
> > I have a multi-meter with the positive lead touching the pin 2 wire and
> > the negative lead touching pin 25 wire, but i am not registering any
> > voltage.
> >
> > =3D(
> >
> > I am sad.
> >
> > I have recompiled my kernel to disable plip and enable ppi.  The
> > following is a snipet of my kernel configuration:
> >
> > # Parallel port
> > device=09=09ppc0=09at isa? irq 7
> > device=09=09ppbus=09=09# Parallel port bus (required)
> > device=09=09lpt=09=09# Printer
> > #
> > # 2002 oct 27 - removed plip and added ppi.
> > #
> > #device=09=09plip=09=09# TCP/IP over parallel
> > device=09=09ppi=09=09# Parallel port interface device
> > #device=09=09vpo=09=09# Requires scbus and da
> >
> > any help would be very much appreciated
> >
> >
> > To Unsubscribe: send mail to majordomo@FreeBSD.org
> > with "unsubscribe freebsd-hackers" in the body of the message
>
>
>
> -----------------------------------------
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