Advantech PCI-1736UP Specifications Page 66
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Comedi
55 / 148
Synopsis
#include <comedilib.h>
int comedi_mark_buffer_written(comedi_t * device, unsigned int subdevice, unsigned int num_bytes);
Description
The function comedi_mark_buffer_written() is used on a subdevice that has a Comedi output command in progress.
It should only be used if you are using a mmap() mapping to write data to Comedi’s buffer (as opposed to calling write() on
the device file), since Comedi will automatically keep track of how many bytes have been transferred via write() calls. This
function is used to indicate that the next num_bytes bytes in the buffer are valid and may be sent to the device.
Return value
The function comedi_mark_buffer_written() returns number of bytes successfully marked as written, or -1 on error.
The return value may be less than num_bytes if you attempt to mark more bytes written than the amount of free space currently
available in the output buffer, 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)).
5.4.2.14 comedi_poll
comedi_poll — force updating of streaming buffer
Synopsis
#include <comedilib.h>
int comedi_poll(comedi_t * device, unsigned int subdevice);
Description
The function comedi_poll() is used on a subdevice that has a Comedi command in progress in order to update the streaming
buffer. If supported by the driver, all available samples are copied to the streaming buffer. These samples may be pending in
DMA buffers or device FIFOs. If successful, the number of additional bytes available is returned. If there is an error, -1 is
returned.
5.4.2.15 comedi_set_buffer_size
comedi_set_buffer_size — streaming buffer size of subdevice
Synopsis
#include <comedilib.h>
int comedi_set_buffer_size(comedi_t * device, unsigned int subdevice, unsigned int size);
Description
The function comedi_set_buffer_size() changes the size of the streaming buffer for the subdevice specified by device
and subdevice. The buffer size will be set to size bytes, rounded up to a multiple of the virtual memory page size. The virtual
memory page size can be determined using sysconf(_SC_PAGE_SIZE).
This function does not require special privileges. However, it is limited to a (adjustable) maximum buffer size, which can be
changed by a privileged user calling comedi_set_max_buffer_size(), or running the program comedi_config.
- 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
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- 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
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- 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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- 5.5.88 pcm3730 -- PCM3730 140
- 130 / 148 141
- Winsystems PCM-MIO pcmmio 142
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- 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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