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 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.