Advantech PCI-1736UP Especificaciones Pagina 32
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Comedi
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• TRIG_EXT: the ‘scan begin’ event occurs when an external trigger signal occurs; e.g., a rising edge of a digital line. scan_-
begin_arg chooses the particular digital line.
The scan_begin_arg used here may not be supported exactly by the device, but it will be adjusted to the nearest supported
value by comedi_command_test().
The timing between each sample in a scan is controlled by the convert_src events. The available options are:
• TRIG_TIMER: the conversion events occur periodically. The time between ‘convert’ events is convert_arg nanoseconds.
• TRIG_EXT: the conversion events occur when an external trigger signal occurs, e.g., a rising edge of a digital line. conver-
t_arg chooses the particular digital line.
• TRIG_NOW: All conversion events in a scan occur simultaneously.
The end of each scan is almost always specified by setting the scan_end_src event to TRIG_COUNT, with the argument being
the same as the number of channels in the chanlist. You could probably find a device that allows something else, but it would
be strange.
The end of an acquisition is controlled by stop_src event. The available options are:
• TRIG_COUNT: stop the acquisition after stop_arg scans.
• TRIG_NONE: perform continuous acquisition, until stopped using comedi_cancel().
Its stop_arg argument is reserved and should be set to 0. (‘Reserved’ means that unspecified things could happen if it is set
to something else but 0.)
There are a couple of less usual or not yet implemented events:
• TRIG_TIME: cause an event to occur at a particular time.
(This event source is reserved for future use.)
• TRIG_OTHER: driver specific event trigger.
This event can be useful as any of the trigger sources. Its exact meaning is driver specific, because it implements a feature
that otherwise does not fit into the generic Comedi command interface. Configuration of TRIG_OTHER features are done by
INSN_CONFIG instructions.
The argument is reserved and should be set to 0.
Not all event sources are applicable to all events. Supported trigger sources for specific events depend significantly on your
particular device, and even more on the current state of its device driver. The comedi_get_cmd_src_mask() function is
useful for determining what trigger sources a subdevice supports.
4.5.4 The command flags
The flags field in the command data structure is used to specify some ‘behaviour’ of the acquisitions in a command. The
meaning of the field is as follows:
• TRIG_RT: ask the driver to use a hard real-time interrupt handler. This will reduce latency in handling interrupts from your
data aquisition hardware. It can be useful if you are sampling at high frequency, or if your hardware has a small onboard data
buffer. You must have a real-time kernel (RTAI or RTLinux/GPL) and must compile Comedi with real-time support, or this
flag will do nothing.
• TRIG_WAKE_EOS: where ‘EOS’ stands for ‘End of Scan’. Some drivers will change their behaviour when this flag is set,
trying to transfer data at the end of every scan (instead of, for example, passing data in chunks whenever the board’s hardware
data buffer is half full). This flag may degrade a driver’s performance at high frequencies, because the end of a scan is, in
general, a much more frequent event than the filling up of the data buffer.
- 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
- 74 / 148 85
- 75 / 148 86
- 76 / 148 87
- 77 / 148 88
- MicroAxial ADQ12-B adq12b 89
- 79 / 148 90
- 80 / 148 91
- 81 / 148 92
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- 88 / 148 99
- 89 / 148 100
- 90 / 148 101
- 91 / 148 102
- 92 / 148 103
- 93 / 148 104
- Status: works 105
- Manufacturer Device Name 105
- 95 / 148 106
- Author: ds, fmhess 107
- 97 / 148 108
- 98 / 148 109
- 99 / 148 110
- 100 / 148 111
- 101 / 148 112
- 102 / 148 113
- 103 / 148 114
- 104 / 148 115
- Status: complete 116
- 106 / 148 117
- 107 / 148 118
- 108 / 148 119
- 5.5.51 fl512 -- unknown 119
- 109 / 148 120
- 110 / 148 121
- 111 / 148 122
- 112 / 148 123
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- 122 / 148 133
- 123 / 148 134
- 124 / 148 135
- 125 / 148 136
- Advantech PCL-816 pcl816 137
- 127 / 148 138
- 128 / 148 139
- 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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