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Comedi
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5.4.4.2 comedi_dio_config
comedi_dio_config — change input/output properties of channel
Synopsis
#include <comedilib.h>
int comedi_dio_config(comedi_t * device, unsigned int subdevice, unsigned int channel, unsigned int direction);
Description
The function comedi_dio_config() configures individual channels in a digital I/O subdevice to be either input or output,
depending on the value of direction. Valid directions are COMEDI_INPUT or COMEDI_OUTPUT.
Depending on the characteristics of the hardware device, multiple channels might be grouped together in hardware when config-
uring the input/output direction. In this case, a single call to comedi_dio_config() for any channel in the group will affect
the entire group.
Return value
If successful, 0 is returned, otherwise -1.
5.4.4.3 comedi_dio_get_config
comedi_dio_get_config — query input/output properties of channel
Synopsis
#include <comedilib.h>
int comedi_dio_get_config(comedi_t * device, unsigned int subdevice, unsigned int channel, unsigned int * direction);
Description
The function comedi_dio_get_config() queries the input/output configuration of an individual channel in a digital I/O
subdevice (see comedi_dio_config()). On success,
*
direction will be set to either COMEDI_INPUT or COMEDI_OU-
TPUT.
Return value
If successful, 0 is returned, otherwise -1.
5.4.4.4 comedi_dio_read
comedi_dio_read — read single bit from digital channel
Synopsis
#include <comedilib.h>
int comedi_dio_read(comedi_t * device, unsigned int subdevice, unsigned int channel, unsigned int * bit);
- 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
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- 13 / 148 24
- 3.5 Further examples 25
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- 17 / 148 28
- 4.2.2 Instruction execution 28
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- 19 / 148 30
- 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
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- 4.7.7 Counter configuration 37
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- 5 Comedi reference 42
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- 5.2.2 CR_PACK_FLAGS 43
- 5.3 Data types and structures 44
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- 5.3.7 comedi_cmd 46
- 5.3.8 comedi_insn 46
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- 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
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- 6.2.1.5 comedi_driver 155
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- 7 Glossary 158
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