Copyright (c) 1983 Regents of the University of California.
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@(#)ad.4 6.1 (Berkeley) 05/15/85

C 5 ad - Data Translation A/D converter "device ad0 at uba0 csr 0170400 vector adintr" Ad provides the 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 ioctls. The AD_CHAN ioctl selects which channel of the board to read. For example,

chan = 5; ioctl(fd, AD_CHAN, &chan); selects channel 5. The AD_READ ioctl actually reads the data and returns it to the user process. An example is

ioctl(fd, AD_READ, &data);

/dev/ad None.