comedi_get_hardcal_converter(3) get converter for hardware-calibrated subdevice


#include <comedilib.h>

int comedi_get_hardcal_converter(comedi_t * device, unsigned subdevice, unsigned channel, unsigned range, enum comedi_conversion_direction direction, comedi_polynomial_t * converter);




The function comedi_get_hardcal_converter initializes the comedi_polynomial_t pointed to by converter so it can be passed to either comedi_to_physical, or comedi_from_physical. The result can be used to convert data from the specified subdevice, channel, and range. The direction parameter specifies whether converter will be passed to comedi_to_physical or comedi_from_physical.

This function initializes the comedi_polynomial_t pointed to by converter as a simple linear function with no calibration information, appropriate for boards which do their gain/offset/nonlinearity corrections in hardware. If your board needs calibration to be performed in software by the host computer, use comedi_get_softcal_converter instead. A subdevice will advertise the fact that it depends on a software calibration with the SDF_SOFT_CALIBRATED subdevice flag.

The result of this function will only depend on the channel parameter if either comedi_range_is_chan_specific or comedi_maxdata_is_chan_specific returns true for the specified subdevice.


Returns 0 on success, -1 on failure.


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.