COMEDI_DATA_READ_HIN(3)

NAME
comedi_data_read_hint - tell driver which channel/range/aref you are going to read from next

SYNOPSIS

#include <comedilib.h>

int comedi_data_read_hint(comedi_t * device, unsigned int subdevice, unsigned int channel, unsigned int range, unsigned int aref);

DESCRIPTION

Used to prepare an analog input for a subsequent call to comedi_data_read. It is not necessary to use this function, but it can be useful for eliminating inaccuracies caused by insufficient settling times when switching the channel or gain on an analog input. This function sets an analog input to the channel, range, and aref specified but does not perform an actual analog to digital conversion.

Alternatively, one can simply use comedi_data_read_delayed, which sets up the input, pauses to allow settling, then performs a conversion.

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.