NAME

       comedi_get_hardware_buffer_size - get size of subdevice's hardware buffer

SYNOPSIS

       #include <comedilib.h>

       int comedi_get_hardware_buffer_size(comedi_t *device, unsigned int subdevice,
                                           enum comedi_io_direction direction);

DESCRIPTION

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

RETURN VALUE

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

AUTHORS

       David Schleef <ds@schleef.org>
           Author.

       Frank Mori Hess <fmhess@users.sourceforge.net>
           Author.

       Herman Bruyninckx <Herman.Bruyninckx@mech.kuleuven.ac.be>
           Author.

       Bernd Porr <tech@linux-usb-daq.co.uk>
           Author.

       Ian Abbott <abbotti@mev.co.uk>
           Author.

COPYRIGHT

       Copyright © 1998-2003 David Schleef
       Copyright © 2001-2003, 2005, 2008 Frank Mori Hess
       Copyright © 2002-2003 Herman Bruyninckx
       Copyright © 2012 Bernd Porr
       Copyright © 2012 Ian Abbott

       This document is part of Comedilib. In the context of this document, the term "source
       code" as defined by the license is interpreted as the XML source.

       This library is free software; you can redistribute it and/or modify it under the terms of
       the GNU Lesser General Public License as published by the Free Software Foundation,
       version 2.1 of the License.

       This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
       without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
       See the GNU Lesser General Public License for more details.

       You should have received a copy of the GNU Lesser General Public License along with this
       library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
       Boston, MA 02111-1307 USA.