COMEDI_SET_FILTER(3)

NAME
comedi_set_filter - select a filter for a subdevice

SYNOPSIS

#include <comedilib.h>

int comedi_set_filter(comedi_t * device, unsigned int subdevice, unsigned int channel, unsigned int filter);

STATUS

alpha

DESCRIPTION

This function selects a filter for a subdevice. For instance, a digital input subdevice may provide deglitching filters with varying cutoff frequencies. The filters are used to prevent high-frequency noise from causing unwanted transitions on the digital inputs. This function can tell the hardware which deglitching filter to use, or to use none at all.

The filter parameter selects which of the subdevice's filters to use, and is driver-dependant.

This function is only useable on subdevices that provide support for the INSN_CONFIG_FILTER configuration instruction.

RETURN VALUE

0 on success, -1 on error.

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.

COPYRIGHT
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, 2015 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.