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authormsmith <msmith@FreeBSD.org>1999-01-20 03:30:39 +0000
committermsmith <msmith@FreeBSD.org>1999-01-20 03:30:39 +0000
commitb6bc97c43ef76cdeea74a6fd3a96c34cc0968e6c (patch)
tree22e2ea477de4ffb1fb94315547780c19e8781da4
parentd1fd3fc4f6fb9e29c01f5cd5c716feaf195171a7 (diff)
downloadFreeBSD-src-b6bc97c43ef76cdeea74a6fd3a96c34cc0968e6c.zip
FreeBSD-src-b6bc97c43ef76cdeea74a6fd3a96c34cc0968e6c.tar.gz
Alog is gone.
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-.\"
-.\" Copyright (c) 1998 Scottibox
-.\" All rights reserved.
-.\"
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\" notice, this list of conditions and the following disclaimer
-.\" in this position and unchanged.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\" notice, this list of conditions and the following disclaimer in the
-.\" documentation and/or other materials provided with the distribution.
-.\" 3. The name of the author may not be used to endorse or promote products
-.\" derived from this software without specific prior written permission
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
-.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
-.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
-.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
-.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
-.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
-.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-.\"
-.\" Industrial Computer Source model AIO8-P
-.\" 8 channel, moderate speed analog to digital converter board with
-.\" 128 channel MUX capability via daisy-chained AT-16P units
-.\" alog.c, character device driver, last revised January 6 1998
-.\" See http://www.scottibox.com
-.\" http://www.indcompsrc.com/products/data/html/aio8g-p.html
-.\" http://www.indcompsrc.com/products/data/html/at16-p.html
-.\"
-.\" Written by: Jamil J. Weatherbee <jamil@scottibox.com>
-.\"
-.\"
-.Dd January 6, 1998
-.Dt ALOG 4 i386
-.Os FreeBSD
-.Sh NAME
-.Nm alog
-.Nd
-Industrial Computer Source AIO8-P driver
-.Sh SYNOPSIS
-.Cd "device alog0 at isa? port 0x260 tty irq 5"
-.Sh DESCRIPTION
-This driver supports the Industrial Computer Source \fIAIO8-P 8-Channel
-12-Bit Analog Input board\fP.
-.Pp
-This board provides 8 12 bit, single-ended analog input ports.
-The driver also directly provides support for up to 8 daisy chained
-\fIAT16-P Programmable Analog Multiplexers with 16 Differential Inputs\fP.
-This makes it possible to sample up to 128 differential channels with a single
-interface board.
-Use of at least one \fIAT16-P\fP is highly recommended as the \fIAIO8-P\fP
-offers no signal conditioning options and only operates in a -5 to +5 Volt
-input range. However, if you wish to use the \fIAIO8-P\fP standalone,
-insert the following into your kernel
-.Xr config 8
-file:
-.Bd -literal -offset indent
-options ALOG_CHANNELS=8
-.Ed
-.Pp
-Selection of the input port is through the minor number:
-.Pp
-.Bd -literal -offset indent
-The 8 bit minor number format is UCCCCMMM, where
- U: board unit (0-1)
-CCCC: external multiplexer channel (0-15) (on AT-16P units)
- MMM: internal multiplexer channel (0-7) (on AIO8-P card)
-.Ed
-.Pp
-.Xr devfs 5
-device node names are of the form: alog[0-1][a-p][0-7]
-.Pp
-.Sh IOCTL
-The following
-.Xr ioctl 2
-calls apply to
-.Nm
-devices. Their declaration can be found in the header files
-.Pa <sys/alogio.h>
-and
-.Pa <sys/dataacq.h>
-.Bl -tag -width AD_MICRO_PERIOD_SET
-.It Dv AD_MICRO_PERIOD_SET
-Takes a pointer to a long argument specifying the number of microseconds
-between samples. Half of this is used as the external multiplexer
-settling time and the other half as conversion time.
-.It Dv AD_MICRO_PERIOD_GET
-Takes a pointer to a long argument and returns the current number of
-microseconds between samples.
-.It Dv AD_NCHANS_GET
-Takes a pointer to an integer and returns the number of channels the board
-supports. This should be 8 for a standalone \fIAIO8-P\fP or 128 for any
-other setup.
-.It Dv AD_FIFOSIZE_GET
-Takes a pointer to an integer and returns the size of the fifo in
-entries. The compile time option ALOG_FIFOSIZE is by default set to 64.
-.It Dv AD_FIFO_TRIGGER_GET
-Takes a pointer to an integer and returns the minimum number of entries a
-fifo must contain to cause
-.Xr poll 2
-to return. This by default is set to 1.
-.It Dv AD_FIFO_TRIGGER_SET
-Takes a pointer to an integer specifying the minimum number of entries a
-fifo must contain to cause
-.Xr poll 2
-to return.
-.It Dv AD_START
-Starts the clocked accumulation of sample values into a channel's driver fifo.
-When a channel is first opened its software fifo is initialized in the
-stopped state. This is to prevent high sample clocks from overrunning the
-fifos before the user is ready to read from the channel. The driver
-automatically performs an AD_START when the user issues the first read,
-except for channels opened with the O_NONBLOCK flag which must explicitly
-have an AD_START issued.
-.It Dv AD_STOP
-Stops the clocked accumulation of sample values into a channel's driver fifo.
-.Sh BUGS
-On the \fIAIO8-P\fP, interrupt driven conversion (the only type
-supported by the
-.Nm
-driver) is facilitated through 8253 timer #2. In order for interrupts to
-be generated you must connect line 6 to line 24 (counter 2 output to
-interrupt input) and line 23 to line 29 (counter 2 gate to +5VDC).
-The design of the \fIAIO8-P\fP precludes the use of programmable
-gain control.
-.Pp
-Use the combination of non-blocking i/o,
-.Xr poll 2
-and a custom fifo trigger
-wherever possible, especially with large numbers of open channels.
-Using this method, multichannel sample rates as high as 16,000 samples/sec
-have been observed.
-.Pp
-Sample rates lower than 32 Hz are not supported.
-.Sh SEE ALSO
-.Bd -literal
-http://www.scottibox.com
-http://www.indcompsrc.com/products/data/html/aio8g-p.html
-http://www.indcompsrc.com/products/data/html/at16-p.html
-.Ed
-.Sh AUTHORS
-.An Jamil J. Weatherbee Aq jamil@scottibox.com
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