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start: now|int
scan_begin: timer (contains the sampling interval. min 1ms)
convert: now
scan_end: count
stop: none|count
- Digital I/O
subdevice: 2
number of channels: 24 (first 8 bits on the D connector, 16 bits int.)
- PWM
subdevice: 3
number of channels: 8 or 4 + polarity output for H-bridge
(see INSN_CONFIG_PWM_SET_H_BRIDGE where
the first byte is the value and the
second the polarity)
max data value: 512
Configuration options:
The device requires firmware which is usually
uploaded automatically by udev/hotplug at the moment
the driver module is loaded.
In case udev/hotplug is not enabled you need to upload
the firmware with comedi_config -i usbdux_firmware.bin.
The firmware is usually installed under /lib/firmware
or can be downloaded form http://www.linux-usb-daq.co.uk.
6 Writing a Comedi driver
This section explains the most important implementations aspects of the Comedi device drivers. It tries to give the interested
device driver writer an overview of the different steps required to write a new device driver.
This section does not explain all implementation details of the Comedi software itself: Comedi has once and for all solved lots of
boring but indispensable infrastructural things, such as: timers, management of which drivers are active, memory management
for drivers and buffers, wrapping of RTOS-specific interfaces, interrupt handler management, general error handling, the /proc
interface, etc. So, the device driver writers can concentrate on the interesting stuff: implementing their specific interface card’s
DAQ functionalities.
In order to make a decent Comedi device driver, you must know the answers to the following questions:
• How does the communication between user-space and kernel-space work?
• What functionality is provided by the generic kernel-space Comedi functions, and what must be provided for each specific new
driver?
• How to use DMA and interrupts?
• What are the addresses and meanings of all the card’s registers?
This information is to be found in the so-called ‘register level manual’ of the card. Without it, coding a device driver is close to
hopeless. It is also something that Comedi (and hence also this handbook) cannot give any support or information for: board
manufacturers all use their own design and nomenclature.
6.1 Communication user-space — kernel-space
In user-space, you interact with the functions implemented in the Comedilib library. Most of the device driver core of the
Comedilib library is found in lib subdirectory.
- 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
- 15 / 148 26
- 16 / 148 27
- 17 / 148 28
- 4.2.2 Instruction execution 28
- 18 / 148 29
- 19 / 148 30
- 4.5.1 Executing a command 30
- 20 / 148 31
- 21 / 148 32
- 4.5.4 The command flags 32
- 4.6 Slowly-varying inputs 33
- 23 / 148 34
- 24 / 148 35
- 4.7.4 Extended Triggering 35
- 25 / 148 36
- 4.7.5 Analog Triggering 36
- 26 / 148 37
- 4.7.7 Counter configuration 37
- 27 / 148 38
- 28 / 148 39
- 29 / 148 40
- 30 / 148 41
- 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
- 45 / 148 56
- Synopsis 56
- Description 56
- 5.5 Kernel drivers 84
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- 77 / 148 88
- MicroAxial ADQ12-B adq12b 89
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- Status: works 105
- Manufacturer Device Name 105
- 95 / 148 106
- Author: ds, fmhess 107
- 97 / 148 108
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- Status: complete 116
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- 108 / 148 119
- 5.5.51 fl512 -- unknown 119
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- 125 / 148 136
- Advantech PCL-816 pcl816 137
- 127 / 148 138
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- 129 / 148 140
- 5.5.88 pcm3730 -- PCM3730 140
- 130 / 148 141
- Winsystems PCM-MIO pcmmio 142
- 133 / 148 144
- 134 / 148 145
- 135 / 148 146
- 136 / 148 147
- 137 / 148 148
- 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
- 145 / 148 156
- 146 / 148 157
- 7 Glossary 158
- 148 / 148 159
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