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Annotation of 43BSDTahoe/man/man4/vax/ad.4, revision 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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