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BSD 4.3reno

.\" Copyright (c) 1983 Regents of the University of California.
.\" All rights reserved.  The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\"
.\"	@(#)ad.4	6.1 (Berkeley) 5/15/85
.\"
.TH AD 4 "May 15, 1985"
.UC 5
.SH NAME
ad \- Data Translation A/D converter
.SH SYNOPSIS
.B "device ad0 at uba0 csr 0170400 vector adintr"
.SH DESCRIPTION
.I Ad
provides the interface to the Data Translation A/D converter.
This is
.B 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 A/D board.
.PP
The driver communicates to a user process by means of ioctls.
The AD_CHAN ioctl selects which channel of the board to read.
For example,
.br
.in +.5i
chan = 5;
ioctl(fd, AD_CHAN, &chan);
.in -.5i
selects channel 5.
The AD_READ ioctl actually reads the data and returns it to the user
process.
An example is
.br
.in +.5i
ioctl(fd, AD_READ, &data);
.in -.5i
.SH FILES
/dev/ad
.SH DIAGNOSTICS
None.

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