89 lines
2.9 KiB
Groff
89 lines
2.9 KiB
Groff
.\" Copyright (c) 1983, 1991 Regents of the University of California.
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.\" All rights reserved.
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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.
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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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" 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 REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)ad.4 6.2 (Berkeley) 3/27/91
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.\" $Id: ad.4,v 1.2 1993/08/01 07:36:38 mycroft Exp $
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.\"
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.Dd March 27, 1991
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.Dt AD 4 vax
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.Os BSD 4.2
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.Sh NAME
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.Nm ad
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.Nd Data Translation A/D converter
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.Sh SYNOPSIS
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.Cd "device ad0 at uba0 csr 0170400 vector adintr"
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.Sh DESCRIPTION
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The
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.Nm \&ad
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driver
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provides an interface to the Data Translation A/D converter.
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This is
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.Em not
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a real-time driver, but merely allows
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the user process to sample the board's channels one at a time.
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Each minor device selects a different
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.Tn A/D
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board.
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.Pp
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The driver communicates to a user process by means of
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.Xr ioctl 2 Ns s.
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The
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.Dv AD_CHAN
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.Xr ioctl
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selects which channel of the board to read.
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For example,
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.Bd -literal -offset indent
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chan = 5;
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ioctl(fd, AD_CHAN, &chan);
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.Ed
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.Pp
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selects channel 5.
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The
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.Dv AD_READ
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.Xr ioctl 2
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actually reads the data and returns it to the user
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process.
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An example is
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.Bd -literal -offset indent
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ioctl(fd, AD_READ, &data);
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.Ed
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.Sh FILES
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.Bl -tag -width /dev/adx -compact
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.It Pa /dev/ad
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.El
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.Sh DIAGNOSTICS
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None.
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.Sh HISTORY
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The
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.Nm
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driver appeared in
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.Bx 4.1 .
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