1COMEDI_DIO_READ(3) Comedi reference COMEDI_DIO_READ(3)
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6 comedi_dio_read - read single bit from digital channel
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9 #include <comedilib.h>
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11 int comedi_dio_read(comedi_t * device, unsigned int subdevice,
12 unsigned int channel, unsigned int * bit);
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15 The function comedi_dio_read reads the channel channel belonging to the
16 subdevice subdevice of device device. The data value that is read is
17 stored in the *bit. This function is equivalent to:
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19 comedi_data_read(device, subdevice, channel, 0, 0, bit);
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21 This function does not require a digital subdevice or a subdevice with
22 a maximum data value of 1 to work properly.
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24 If you wish to read multiple digital channels at once, it is more
25 efficient to use comedi_dio_bitfield2 than to call this function
26 multiple times.
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29 Return values and errors are the same as comedi_data_read.
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32 David Schleef <ds@schleef.org>
33 Author.
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35 Frank Mori Hess <fmhess@users.sourceforge.net>
36 Author.
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38 Herman Bruyninckx <Herman.Bruyninckx@mech.kuleuven.ac.be>
39 Author.
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41 Bernd Porr <tech@linux-usb-daq.co.uk>
42 Author.
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44 Ian Abbott <abbotti@mev.co.uk>
45 Author.
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47 Éric Piel <piel@delmic.com>
48 Author.
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51 Copyright © 1998-2003 David Schleef
52 Copyright © 2001-2003, 2005, 2008 Frank Mori Hess
53 Copyright © 2002-2003 Herman Bruyninckx
54 Copyright © 2012 Bernd Porr
55 Copyright © 2012 Ian Abbott
56 Copyright © 2012, 2015 Éric Piel
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58 This document is part of Comedilib. In the context of this document,
59 the term "source code" as defined by the license is interpreted as the
60 XML source.
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62 This library is free software; you can redistribute it and/or modify it
63 under the terms of the GNU Lesser General Public License as published
64 by the Free Software Foundation, version 2.1 of the License.
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66 This library is distributed in the hope that it will be useful, but
67 WITHOUT ANY WARRANTY; without even the implied warranty of
68 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
69 General Public License for more details.
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71 You should have received a copy of the GNU Lesser General Public
72 License along with this library; if not, write to the Free Software
73 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
74 USA.
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79Comedi 05/11/2017 COMEDI_DIO_READ(3)