1COMEDI_GET_HARDWARE_(3)        Comedi reference        COMEDI_GET_HARDWARE_(3)
2
3
4

NAME

6       comedi_get_hardware_buffer_size - get size of subdevice's hardware
7       buffer
8

SYNOPSIS

10       #include <comedilib.h>
11
12       int comedi_get_hardware_buffer_size(comedi_t *device,
13                                           unsigned int subdevice,
14                                           enum comedi_io_direction direction);
15

DESCRIPTION

17       This function returns the number of bytes the subdevice can hold in
18       it's hardware buffer. The term “hardware buffer” refers to any FIFOs,
19       etc. on the acquisition board itself which are used during streaming
20       commands. This does not include the buffer maintained by the comedi
21       kernel module in host memory, whose size may be queried by
22       comedi_get_buffer_size. The direction parameter of type enum
23       comedi_io_direction should be set to COMEDI_INPUT to query the input
24       buffer size (e.g., the buffer of an analog input subdevice), or
25       COMEDI_OUTPUT to query the output buffer size (e.g., the buffer of an
26       analog output).
27

RETURN VALUE

29       Hardware buffer size in bytes, or -1 on error.
30

AUTHORS

32       David Schleef <ds@schleef.org>
33           Author.
34
35       Frank Mori Hess <fmhess@users.sourceforge.net>
36           Author.
37
38       Herman Bruyninckx <Herman.Bruyninckx@mech.kuleuven.ac.be>
39           Author.
40
41       Bernd Porr <tech@linux-usb-daq.co.uk>
42           Author.
43
44       Ian Abbott <abbotti@mev.co.uk>
45           Author.
46
47       Éric Piel <piel@delmic.com>
48           Author.
49
51       Copyright © 1998-2003 David Schleef
52       Copyright © 2001-2003, 2005, 2008 Frank Mori Hess
53       Copyright © 2002-2003 Herman Bruyninckx
54       Copyright © 2012 Bernd Porr
55       Copyright © 2012 Ian Abbott
56       Copyright © 2012, 2015 Éric Piel
57
58       This document is part of Comedilib. In the context of this document,
59       the term "source code" as defined by the license is interpreted as the
60       XML source.
61
62       This library is free software; you can redistribute it and/or modify it
63       under the terms of the GNU Lesser General Public License as published
64       by the Free Software Foundation, version 2.1 of the License.
65
66       This library is distributed in the hope that it will be useful, but
67       WITHOUT ANY WARRANTY; without even the implied warranty of
68       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
69       General Public License for more details.
70
71       You should have received a copy of the GNU Lesser General Public
72       License along with this library; if not, write to the Free Software
73       Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
74       USA.
75
76
77
78
79Comedi                            05/11/2017           COMEDI_GET_HARDWARE_(3)
Impressum