AD(4) | Device Drivers Manual (vax) | AD(4) |
ad
—
ad0 at uba0 csr 0170400 vector adintr
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);
ad
driver appeared in
4.1BSD.
June 5, 1993 | NetBSD 9.4 |