comedi_from_phys(3) convert physical units to sample


#include <comedilib.h>

lsampl_t comedi_from_phys(double data, comedi_range * range, lsampl_t maxdata);


Converts parameter data given in physical units (double) into sample values (lsampl_t, between 0 and maxdata). The parameter range represents the conversion information to use, and the parameter maxdata represents the maximum possible data value for the channel that the data will be written to. The mapping between physical units and raw data is linear and assumes that the converter has ideal characteristics.

Conversion is not affected by out-of-range behavior. Out-of-range data parameters are silently truncated to the range 0 to maxdata.


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.

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.