comedi_dio_read(3) read single bit from digital channel


#include <comedilib.h>

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


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 values and errors are the same as comedi_data_read.


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.