COMEDI_FROM_PHYSICAL(3) Comedi reference COMEDI_FROM_PHYSICAL(3)
NAME
comedi_from_physical - convert physical units to sample using calibration data
SYNOPSIS
#include <comedilib.h>
lsampl_t comedi_from_physical(double data, const comedi_polynomial_t * conversion_polynomial);
DESCRIPTION
Converts data given in physical units into Comedi's integer sample values (lsampl_t, between 0 and maxdata -- see comedi_get_maxdata). The
conversion_polynomial parameter is obtained from either comedi_get_hardcal_converter or comedi_get_softcal_converter. The allows non linear
and board specific correction. The result will be rounded using the C library's current rounding direction. No range checking of the input
data is performed. It is up to you to ensure your data is within the limits of the output range you are using.
RETURN VALUE
Comedi sample value corresponding to input physical value.
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 (C) 1998-2003 David Schleef
Copyright (C) 2001-2003, 2005, 2008 Frank Mori Hess
Copyright (C) 2002-2003 Herman Bruyninckx
Copyright (C) 2012 Bernd Porr
Copyright (C) 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.
Comedi 07/06/2012 COMEDI_FROM_PHYSICAL(3)