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Comedi

List of Figures

1 Asynchronous Acquisition Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Abstract

Comedi is a free software project to interface digital acquisition (DAQ) cards. It is the combination of three complementary

software items: (i) a generic, device-independent API, (ii) a collection of Linux kernel modules that implement this API for a

wide range of cards, and (iii) a Linux user space library with a developer-oriented programming interface to conﬁgure and use

the cards.

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 158 159

Contents 3
List of Figures 11
1 Overview 12
1.4 DAQ signals 13
1.5 Device hierarchy 14
1.6 Acquisition terminology 14
1.7 DAQ functions 15
1.8 Supporting functionality 15
2 Conﬁguration 16
3 Writing Comedi programs 19
10 / 148 21
3.4 Asynchronous acquisition 22
12 / 148 23
13 / 148 24
3.5 Further examples 25
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4.2.2 Instruction execution 28
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4.5.1 Executing a command 30
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21 / 148 32
4.5.4 The command ﬂags 32
4.6 Slowly-varying inputs 33
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24 / 148 35
4.7.4 Extended Triggering 35
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4.7.5 Analog Triggering 36
26 / 148 37
4.7.7 Counter conﬁguration 37
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5 Comedi reference 42
32 / 148 43
5.2.2 CR_PACK_FLAGS 43
5.3 Data types and structures 44
35 / 148 46
5.3.7 comedi_cmd 46
5.3.8 comedi_insn 46
36 / 148 47
5.3.9 comedi_range 47
5.3.10 comedi_krange 47
5.4 Functions 48
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Synopsis 56
Description 56
5.5 Kernel drivers 84
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MicroAxial ADQ12-B adq12b 89
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Status: works 105
Manufacturer Device Name 105
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Author: ds, fmhess 107
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Status: complete 116
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5.5.51 ﬂ512 -- unknown 119
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Advantech PCL-816 pcl816 137
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5.5.88 pcm3730 -- PCM3730 140
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Winsystems PCM-MIO pcmmio 142
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Status: stable 149
ITL USB-DUX-FAST usbduxfast 149
Status: Stable 150
ITL USB-DUX-SIGMA usbduxsigma 150
6 Writing a Comedi driver 151
6.2 Generic functionality 152
142 / 148 153
6.2.1.1 comedi_lrange 153
6.2.1.2 comedi_subdevice 153
143 / 148 154
6.2.1.3 comedi_device 154
6.2.1.4 comedi_async 154
144 / 148 155
6.2.1.5 comedi_driver 155
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7 Glossary 158
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