NAME

       comedi_dio_read - read single bit from digital channel

SYNOPSIS

       #include <comedilib.h>

       int comedi_dio_read(comedi_t * device, unsigned int subdevice, unsigned int channel,
                           unsigned int * bit);

DESCRIPTION

       The function comedi_dio_read reads the channel channel belonging to the subdevice
       subdevice of device device. The data value that is read is stored in the *bit. This
       function is equivalent to:

           comedi_data_read(device, subdevice, channel, 0, 0, bit);

       This function does not require a digital subdevice or a subdevice with a maximum data
       value of 1 to work properly.

       If you wish to read multiple digital channels at once, it is more efficient to use
       comedi_dio_bitfield2 than to call this function multiple times.

RETURN VALUE

       Return values and errors are the same as comedi_data_read.

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.