1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)ad.4 8.1 (Berkeley) 6/5/93 33.\" 34.Dd June 5, 1993 35.Dt AD 4 vax 36.Os BSD 4.2 37.Sh NAME 38.Nm ad 39.Nd Data Translation A/D converter 40.Sh SYNOPSIS 41.Cd "device ad0 at uba0 csr 0170400 vector adintr" 42.Sh DESCRIPTION 43The 44.Nm \&ad 45driver 46provides an interface to the Data Translation A/D converter. 47This is 48.Em not 49a real-time driver, but merely allows 50the user process to sample the board's channels one at a time. 51Each minor device selects a different 52.Tn A/D 53board. 54.Pp 55The driver communicates to a user process by means of 56.Xr ioctl 2 Ns s. 57The 58.Dv AD_CHAN 59.Xr ioctl 60selects which channel of the board to read. 61For example, 62.Bd -literal -offset indent 63chan = 5; 64ioctl(fd, AD_CHAN, &chan); 65.Ed 66.Pp 67selects channel 5. 68The 69.Dv AD_READ 70.Xr ioctl 2 71actually reads the data and returns it to the user 72process. 73An example is 74.Bd -literal -offset indent 75ioctl(fd, AD_READ, &data); 76.Ed 77.Sh FILES 78.Bl -tag -width /dev/adx -compact 79.It Pa /dev/ad 80.El 81.Sh DIAGNOSTICS 82None. 83.Sh HISTORY 84The 85.Nm 86driver appeared in 87.Bx 4.1 . 88