Date: 09 Jun 2003 22:39:30 +0200 From: Andreas Kohn <andreas.kohn@gmx.net> To: Dan Malaby <dan@peritek.com> Cc: freebsd-questions@freebsd.org Subject: Re: how to talk to the serial and parallel ports through a C program Message-ID: <1055191169.2177.8.camel@klamath.ankon.homeip.net> In-Reply-To: <5.1.0.14.2.20030609093752.00a69d20@pop3.peritek.com> References: <5.1.0.14.2.20030609093752.00a69d20@pop3.peritek.com>
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Am Mon, 2003-06-09 um 18.44 schrieb Dan Malaby:
> I was wondering if there was a good place to go to get programing example=
s=20
> on how to
> talk to the serial and parallel ports. I have looked in the developers=20
> handbook but have not
> any luck finding what I want.
>=20
> Any pointers would be appreciated
>
> Thanks
Hello,=20
at least for parallel ports, ppi might help you. There is a short
example in the ppi(4) man page:
To present the value 0x5a to the data port, drive STROBE low and
then
high again, the following code fragment can be used:
=20
int fd;
u_int8_t val;
=20
val =3D 0x5a;
ioctl(fd, PPISDATA, &val);
ioctl(fd, PPIGCTRL, &val);
val |=3D STROBE;
ioctl(fd, PPISCTRL, &val);
val &=3D ~STROBE;
ioctl(fd, PPISCTRL, &val);
HTH,=20
--=20
Andreas Kohn <andreas.kohn@gmx.net>
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