[unix-history] / usr / man / man4 / ad.4

.TH AD 4 "27 July 1983"
.UC 4
.SH NAME
ad \- Data Translation A/D converter
.SH SYNOPSIS
.B "device ad0 at uba0 csr 0170400 vector adintr"
.SH DESCRIPTION
.I Ad
provides the interface to the Data Translation A/D converter.
This is
.B 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.
.PP
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,
.br
.in +.5i
chan = 5;
ioctl(fd, AD_CHAN, &chan);
.in -.5i
selects channel 5.
The AD_READ ioctl actually reads the data and returns it to the user
process.
An example is
.br
.in +.5i
ioctl(fd, AD_READ, &data);
.in -.5i
.SH FILES
/dev/ad
.SH DIAGNOSTICS
None.
Commit	Line	Data
e0e5a999 C	1	.TH AD 4 "27 July 1983"
	2	.UC 4
	3	.SH NAME
	4	ad \- Data Translation A/D converter
	5	.SH SYNOPSIS
	6	.B "device ad0 at uba0 csr 0170400 vector adintr"
	7	.SH DESCRIPTION
	8	.I Ad
	9	provides the interface to the Data Translation A/D converter.
	10	This is
	11	.B not
	12	a real-time driver, but merely allows
	13	the user process to sample the board's channels one at a time.
	14	Each minor device selects a different A/D board.
	15	.PP
	16	The driver communicates to a user process by means of ioctls.
	17	The AD_CHAN ioctl selects which channel of the board to read.
	18	For example,
	19	.br
	20	.in +.5i
	21	chan = 5;
	22	ioctl(fd, AD_CHAN, &chan);
	23	.in -.5i
	24	selects channel 5.
	25	The AD_READ ioctl actually reads the data and returns it to the user
	26	process.
	27	An example is
	28	.br
	29	.in +.5i
	30	ioctl(fd, AD_READ, &data);
	31	.in -.5i
	32	.SH FILES
	33	/dev/ad
	34	.SH DIAGNOSTICS
	35	None.