1.\" $NetBSD: ad.4,v 1.10 2002/02/13 08:18:06 ross Exp $ 2.\" 3.\" Copyright (c) 1983, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" from: @(#)ad.4 8.1 (Berkeley) 6/5/93 35.\" 36.Dd June 5, 1993 37.Dt AD 4 vax 38.Os 39.Sh NAME 40.Nm ad 41.Nd Data Translation A/D converter 42.Sh SYNOPSIS 43.Cd "ad0 at uba0 csr 0170400 vector adintr" 44.Sh DESCRIPTION 45NOTE: This driver has not been ported from 46.Bx 4.4 47yet. 48.Pp 49The 50.Nm \&ad 51driver 52provides an interface to the Data Translation A/D converter. 53This is 54.Em not 55a real-time driver, but merely allows 56the user process to sample the board's channels one at a time. 57Each minor device selects a different 58.Tn A/D 59board. 60.Pp 61The driver communicates to a user process by means of 62.Xr ioctl 2 Ns s . 63The 64.Dv AD_CHAN 65.Xr ioctl 2 66selects which channel of the board to read. 67For example, 68.Bd -literal -offset indent 69chan = 5; 70ioctl(fd, AD_CHAN, \*[Am]chan); 71.Ed 72.Pp 73selects channel 5. 74The 75.Dv AD_READ 76.Xr ioctl 2 77actually reads the data and returns it to the user 78process. 79An example is 80.Bd -literal -offset indent 81ioctl(fd, AD_READ, \*[Am]data); 82.Ed 83.Sh FILES 84.Bl -tag -width /dev/adx -compact 85.It Pa /dev/ad 86.El 87.Sh DIAGNOSTICS 88None. 89.Sh HISTORY 90The 91.Nm 92driver appeared in 93.Bx 4.1 . 94