comedi_get_hardware_buffer_size(3) get size of subdevice's hardware buffer


#include <comedilib.h>

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


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).


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


David Schleef <[email protected]>


Frank Mori Hess <[email protected]>


Herman Bruyninckx <[email protected]>


Bernd Porr <[email protected]>


Ian Abbott <[email protected]>


Éric Piel <[email protected]>



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
Copyright © 2012 Éric Piel

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.

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