1COMEDI_GET_HARDWARE_(3) Comedi reference COMEDI_GET_HARDWARE_(3)
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6 comedi_get_hardware_buffer_size - get size of subdevice's hardware
7 buffer
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10 #include <comedilib.h>
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12 int comedi_get_hardware_buffer_size(comedi_t *device,
13 unsigned int subdevice,
14 enum comedi_io_direction direction);
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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).
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29 Hardware buffer size in bytes, or -1 on error.
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32 David Schleef <ds@schleef.org>
33 Author.
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35 Frank Mori Hess <fmhess@users.sourceforge.net>
36 Author.
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38 Herman Bruyninckx <Herman.Bruyninckx@mech.kuleuven.ac.be>
39 Author.
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41 Bernd Porr <tech@linux-usb-daq.co.uk>
42 Author.
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44 Ian Abbott <abbotti@mev.co.uk>
45 Author.
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47 Éric Piel <piel@delmic.com>
48 Author.
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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
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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.
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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.
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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.
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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.
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79Comedi 05/11/2017 COMEDI_GET_HARDWARE_(3)