Advantech PCI-1736UP Specifikace Strana 65
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Hodnocené. / 5. Na základě hodnocení zákazníků
Comedi
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Synopsis
#include <comedilib.h>
int comedi_get_read_subdevice(comedi_t * device);
Description
The function comedi_get_read_subdevice() returns the index of the subdevice whose streaming input buffer is accessible
through the device device. If there is no such subdevice, -1 is returned.
5.4.2.11 comedi_get_write_subdevice
comedi_get_write_subdevice — find streaming output subdevice
Synopsis
#include <comedilib.h>
int comedi_get_write_subdevice(comedi_t * device);
Description
The function comedi_get_write_subdevice() returns the index of the subdevice whose streaming output buffer is acces-
sible through the device device. If there is no such subdevice, -1 is returned.
5.4.2.12 comedi_mark_buffer_read
comedi_mark_buffer_read — streaming buffer control
Synopsis
#include <comedilib.h>
int comedi_mark_buffer_read(comedi_t * device, unsigned int subdevice, unsigned int num_bytes);
Description
The function comedi_mark_buffer_read() is used on a subdevice that has a Comedi input command in progress. It should
only be used if you are using a mmap() mapping to read data from Comedi’s buffer (as opposed to calling read() on the device
file), since Comedi will automatically keep track of how many bytes have been transferred via read() calls. This function is
used to indicate that the next num_bytes bytes in the buffer are no longer needed and may be discarded.
Return value
The function comedi_mark_buffer_read() returns the number of bytes successfully marked as read, or -1 on error. The
return value may be less than num_bytes if you attempt to mark more bytes read than are currently available for reading, or
if num_bytes must be rounded down to be an exact multiple of the subdevice’s sample size (either sizeof(sampl_t) or
sizeof(lsampl_t)).
5.4.2.13 comedi_mark_buffer_written
comedi_mark_buffer_written — streaming buffer control
- 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
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- 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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- MicroAxial ADQ12-B adq12b 89
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- Status: works 105
- Manufacturer Device Name 105
- 95 / 148 106
- 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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- 125 / 148 136
- Advantech PCL-816 pcl816 137
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- 129 / 148 140
- 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
- 145 / 148 156
- 146 / 148 157
- 7 Glossary 158
- 148 / 148 159
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