ad(4) - NetBSD Manual Pages

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AD(4)                 NetBSD/vax Kernel Interfaces Manual                AD(4)


NAME

     ad - Data Translation A/D converter


SYNOPSIS

     ad0 at uba0 csr 0170400 vector adintr


DESCRIPTION

     NOTE: This driver has not been ported from 4.4BSD yet.

     The ad driver provides an interface to the Data Translation A/D con-
     verter.  This is 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.

     The driver communicates to a user process by means of ioctl(2)s.  The
     AD_CHAN ioctl(2) selects which channel of the board to read.  For exam-
     ple,

           chan = 5;
           ioctl(fd, AD_CHAN, &chan);

     selects channel 5.  The AD_READ ioctl(2) actually reads the data and
     returns it to the user process.  An example is

           ioctl(fd, AD_READ, &data);


FILES

     /dev/ad


DIAGNOSTICS

     None.


HISTORY

     The ad driver appeared in 4.1BSD.

NetBSD 2.0.2                     June 5, 1993                     NetBSD 2.0.2