117 lines
3.4 KiB
Groff
117 lines
3.4 KiB
Groff
.\" $NetBSD: ppi.9,v 1.4 2005/12/26 19:48:12 perry Exp $
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.\"
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.\" Copyright (c) 1997
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.\" Michael Smith
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer as
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.\" the first lines of this file unmodified.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
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.\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
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.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD: src/share/man/man4/ppi.4,v 1.4.2.7 2001/12/17 11:30:12 ru Exp $
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.\"
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.Dd December 29, 2003
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.Dt PPI 9
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.Os
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.Sh NAME
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.Nm ppi
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.Nd "user-space interface to ppbus parallel port"
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.Sh SYNOPSIS
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.In sys/ioctl.h
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.In dev/ppbus/ppi.h
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.In dev/ppbus/ppbus_conf.h
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.Sh DESCRIPTION
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All I/O on the
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.Nm
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interface is performed using
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.Fn ioctl
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calls.
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Each command takes a single
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.Ft uint8_t
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argument, transferring one byte of data.
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The following commands are available:
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.Bl -tag -width indent
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.It Dv PPIGDATA , PPISDATA
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Get and set the contents of the data register.
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.It Dv PPIGSTATUS , PPISSTATUS
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Get and set the contents of the status register.
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.It Dv PPIGCTRL , PPISCTRL
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Get and set the contents of the control register.
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The following defines correspond to bits in this register.
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Setting a bit in the control register drives the corresponding
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output low.
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.Bl -tag -width indent -compact
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.It Dv STROBE
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.It Dv AUTOFEED
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.It Dv nINIT
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.It Dv SELECTIN
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.It Dv PCD
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.El
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.It Dv PPIGEPP , PPISEPP
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Get and set the contents of the EPP control register.
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.It Dv PPIGECR , PPISECR
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Get and set the contents of the ECP control register.
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.It Dv PPIGFIFO , PPISFIFO
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Read and write the ECP FIFO (8-bit operations only).
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.El
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.Sh EXAMPLES
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To present the value 0x5a to the data port, drive STROBE low and
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then high again, the following code fragment can be used:
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.Bd -literal -compact
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int fd;
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uint8_t val;
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val = 0x5a;
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ioctl(fd, PPISDATA, \*[Am]val);
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ioctl(fd, PPIGCTRL, \*[Am]val);
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val |= STROBE;
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ioctl(fd, PPISCTRL, \*[Am]val);
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val \*[Am]= ~STROBE;
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ioctl(fd, PPISCTRL, \*[Am]val);
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.Ed
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.Sh SEE ALSO
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.Xr ioctl 2 ,
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.Xr atppc 4 ,
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.Xr io 4 ,
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.Xr ppbus 4 ,
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.Xr ppi 4
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.Sh HISTORY
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.Nm
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originally appeared in
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.Fx .
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.Sh AUTHORS
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This manual page is based on the
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.Fx
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.Nm ppi
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manual page and was updated for the
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.Nx
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port by
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.An Gary Thorpe .
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.Sh BUGS
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The inverse sense of signals is confusing.
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.Pp
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The
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.Fn ioctl
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interface is slow, and there is no way (yet) to chain multiple operations together.
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.Pp
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The headers required for user applications are not installed as part of the
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standard system.
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