2 .\" Copyright (c) 1995 HD Associates, Inc.
3 .\" All rights reserved.
5 .\" Redistribution and use in source and binary forms, with or without
6 .\" modification, are permitted provided that the following conditions
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12 .\" documentation and/or other materials provided with the distribution.
13 .\" 3. All advertising materials mentioning features or use of this software
14 .\" must display the following acknowledgement:
15 .\" This product includes software developed by Christopher G. Demetriou.
16 .\" 3. The name of the author may not be used to endorse or promote products
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30 .\" $FreeBSD: src/share/man/man4/man4.i386/labpc.4,v 1.8.2.2 2001/08/17 13:08:45 ru Exp $
31 .\" $DragonFly: src/share/man/man4/man4.i386/labpc.4,v 1.4 2007/03/22 23:02:31 swildner Exp $
38 .Nd National Instruments LABPC and LABPC+ driver
40 .Cd "device labpc0 at isa? port 260 irq 5"
42 This supports the National Instruments LABPC and LABPC+ \fILow-Cost
43 Multifunction I/O Board\fP.
45 This board provides 8 12 bit A-D input channels, 2 12 bit D-A output
46 channels, and 3 8 bit digital I/O ports. It also supports setting
47 up the National Instruments SCXI bus off the digital I/O ports,
48 although that software is currently present in an external program
49 and not as part of the driver.
51 The selection of the input or output device, mode, and channel is
52 through the minor number:
53 .Bd -literal -offset indent
54 The 8 bit minor number format is UUSIDCCC, with
56 S: SCAN bit for scan enable.
57 I: INTERVAL for interval support
58 D: 1: Digital I/O, 0: Analog I/O
59 CCC: The channel selector:
61 input: channel must be 0 to 7 for AD0 ... AD7
62 output: channel must be 0 to 2
65 2: Alternate channel 0 then 1
68 input: Channel must be 0 to 2.
69 output: Channel must be 0 to 2.
72 The /dev/MAKEDEV script will make the basic analog and digital
73 devices if you do "sh MAKEDEV labpcaio" and "sh MAKEDEV labpcdio",
74 however, it won't make device entries for INTERVAL and SCAN devices.
75 SCAN devices automatically scan over all channels from the channel
76 number down to 0 (for example, a SCAN for /dev/ad7 will read channels
77 AD7 ... AD0) while the INTERVAL device will wait for an external
78 signal and then read all the channels from the selected channel
79 number down to 0 as fast as it can. This is done by the hardware
80 and not the driver (other than turning it on); See the \fILabPC+
81 User's Manual\fP and the source code if this doesn't make sense to
84 The driver supports several general analog I/O ioctl calls. These
87 and are intended to be implemented in
88 other data acquisition board device drivers.
90 .Dv AD_MICRO_PERIOD_SET
91 takes a pointer to a long argument specifying
92 the number of microseconds between samples.
94 .Dv AD_MICRO_PERIOD_GET
95 takes a pointer to a long argument and returns
96 the current number of microseconds between samples.
99 takes a pointer to an integer and returns the number
100 of different gain settings the board supports. This is 8 for the
104 takes a pointer to an integer and returns the number
105 of channels the board supports. This is 8 for the LabPC board.
107 .Dv AD_SUPPORTED_GAINS
108 returns an array of NGAINS (the number obtained
111 doubles. These are the gains the board supports.
114 takes an array of NCHANS (the number obtained by
116 integers and sets the board gains. These are indices
117 into the supported gain array, with one gain for each channel.
120 takes an array of NCHANS (returned by
122 integers and returns the current board gains.
124 In general, only those capabilities that I needed are present. In
125 particular the following notable restrictions are present.
127 The analog input is only supported in a clocked conversion mode.
129 You can only set the sample clock down to 15 Hz. Anything slower
130 needs a modification to the driver to support TCINTEN in order to
131 chain together the counters to get a lower clock rate.
133 There is no support for clocked D-A output.
135 The 8255 providing the digital I/O ports is supported only in mode
136 0 (three 8 bit ports).
138 There is support for the SCXI bus off the LABPC board. It is not
139 in the driver but is a separate user process that accesses the
140 digital I/O devices. Ask dufault@hda.com for it.
142 MAKEDEV only makes the "basic" devices. You must make the INTERVAL
143 or SCAN devices by hand.
145 The INTERVAL device sets the clock rate as high as possible so that
146 it samples all the channels as quickly as it can after the external
147 signal. This is a silly restriction; it should simply use the
150 National Instrument's (like most other laboratory grade board
151 vendors) definition of Low-Cost differs dramatically from many on