AD(4) Kernel Interfaces Manual (VAX) AD(4)
NAME
adData 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.