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 converter. 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 example,
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.