90 lines
2.9 KiB
Groff
90 lines
2.9 KiB
Groff
.\" $NetBSD: ad.4,v 1.3 1996/03/03 17:13:12 thorpej Exp $
|
|
.\"
|
|
.\" Copyright (c) 1983, 1991 Regents of the University of California.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" from: @(#)ad.4 6.2 (Berkeley) 3/27/91
|
|
.\"
|
|
.Dd March 27, 1991
|
|
.Dt AD 4 vax
|
|
.Os BSD 4.2
|
|
.Sh NAME
|
|
.Nm ad
|
|
.Nd Data Translation A/D converter
|
|
.Sh SYNOPSIS
|
|
.Cd "device ad0 at uba0 csr 0170400 vector adintr"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm \&ad
|
|
driver
|
|
provides an interface to the Data Translation A/D converter.
|
|
This is
|
|
.Em not
|
|
a real-time driver, but merely allows
|
|
the user process to sample the board's channels one at a time.
|
|
Each minor device selects a different
|
|
.Tn A/D
|
|
board.
|
|
.Pp
|
|
The driver communicates to a user process by means of
|
|
.Xr ioctl 2 Ns s.
|
|
The
|
|
.Dv AD_CHAN
|
|
.Xr ioctl
|
|
selects which channel of the board to read.
|
|
For example,
|
|
.Bd -literal -offset indent
|
|
chan = 5;
|
|
ioctl(fd, AD_CHAN, &chan);
|
|
.Ed
|
|
.Pp
|
|
selects channel 5.
|
|
The
|
|
.Dv AD_READ
|
|
.Xr ioctl 2
|
|
actually reads the data and returns it to the user
|
|
process.
|
|
An example is
|
|
.Bd -literal -offset indent
|
|
ioctl(fd, AD_READ, &data);
|
|
.Ed
|
|
.Sh FILES
|
|
.Bl -tag -width /dev/adx -compact
|
|
.It Pa /dev/ad
|
|
.El
|
|
.Sh DIAGNOSTICS
|
|
None.
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
driver appeared in
|
|
.Bx 4.1 .
|