comedi_to_phys man page

comedi_to_phys — convert sample to physical units

Synopsis

#include <comedilib.h>

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

Description

Converts parameter data given in sample values (lsampl_t, between 0 and maxdata) into physical units (double). 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 was read. The mapping between physical units is linear and assumes ideal converter characteristics.

Conversion of endpoint sample values, that is, sample values equal to 0 or maxdata, is affected by the Comedilib out-of-range behavior (see function comedi_set_global_oor_behavior). If the out-of-range behavior is set to COMEDI_OOR_NAN, endpoint values are converted to NAN. If the out-of-range behavior is set to COMEDI_OOR_NUMBER, the endpoint values are converted similarly to other values.

If there is an error, NAN is returned.

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.

Éric Piel <piel@delmic.com>

Author.

Info

05/11/2017 Comedi reference