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Annotation of 43BSDReno/share/man/man4/man4.vax/ad.4, revision 1.1.1.1

1.1       root        1: .\" Copyright (c) 1983 Regents of the University of California.
                      2: .\" All rights reserved.  The Berkeley software License Agreement
                      3: .\" specifies the terms and conditions for redistribution.
                      4: .\"
                      5: .\"    @(#)ad.4        6.1 (Berkeley) 5/15/85
                      6: .\"
                      7: .TH AD 4 "May 15, 1985"
                      8: .UC 5
                      9: .SH NAME
                     10: ad \- Data Translation A/D converter
                     11: .SH SYNOPSIS
                     12: .B "device ad0 at uba0 csr 0170400 vector adintr"
                     13: .SH DESCRIPTION
                     14: .I Ad
                     15: provides the interface to the Data Translation A/D converter.
                     16: This is
                     17: .B not
                     18: a real-time driver, but merely allows
                     19: the user process to sample the board's channels one at a time.
                     20: Each minor device selects a different A/D board.
                     21: .PP
                     22: The driver communicates to a user process by means of ioctls.
                     23: The AD_CHAN ioctl selects which channel of the board to read.
                     24: For example,
                     25: .br
                     26: .in +.5i
                     27: chan = 5;
                     28: ioctl(fd, AD_CHAN, &chan);
                     29: .in -.5i
                     30: selects channel 5.
                     31: The AD_READ ioctl actually reads the data and returns it to the user
                     32: process.
                     33: An example is
                     34: .br
                     35: .in +.5i
                     36: ioctl(fd, AD_READ, &data);
                     37: .in -.5i
                     38: .SH FILES
                     39: /dev/ad
                     40: .SH DIAGNOSTICS
                     41: None.

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