1.\" $NetBSD: ad.4,v 1.4 1997/10/19 12:58:23 mrg 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 BSD 4.2 39.Sh NAME 40.Nm ad 41.Nd Data Translation A/D converter 42.Sh SYNOPSIS 43.Cd "device ad0 at uba0 csr 0170400 vector adintr" 44.Sh DESCRIPTION 45The 46.Nm \&ad 47driver 48provides an interface to the Data Translation A/D converter. 49This is 50.Em not 51a real-time driver, but merely allows 52the user process to sample the board's channels one at a time. 53Each minor device selects a different 54.Tn A/D 55board. 56.Pp 57The driver communicates to a user process by means of 58.Xr ioctl 2 Ns s. 59The 60.Dv AD_CHAN 61.Xr ioctl 62selects which channel of the board to read. 63For example, 64.Bd -literal -offset indent 65chan = 5; 66ioctl(fd, AD_CHAN, &chan); 67.Ed 68.Pp 69selects channel 5. 70The 71.Dv AD_READ 72.Xr ioctl 2 73actually reads the data and returns it to the user 74process. 75An example is 76.Bd -literal -offset indent 77ioctl(fd, AD_READ, &data); 78.Ed 79.Sh FILES 80.Bl -tag -width /dev/adx -compact 81.It Pa /dev/ad 82.El 83.Sh DIAGNOSTICS 84None. 85.Sh HISTORY 86The 87.Nm 88driver appeared in 89.Bx 4.1 . 90