1COMEDI_SET_CLOCK_SOU(3)        Comedi reference        COMEDI_SET_CLOCK_SOU(3)
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NAME

6       comedi_set_clock_source - set master clock for a subdevice
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SYNOPSIS

9       #include <comedilib.h>
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11       int comedi_set_clock_source(comedi_t * device, unsigned int subdevice,
12                                   unsigned int channel, unsigned int clock,
13                                   unsigned int period_ns);
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STATUS

16       alpha
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DESCRIPTION

19       This function selects a master clock for a subdevice. The clock
20       parameter selects the master clock, and is driver-dependant. If the
21       subdevice does not support configuring its master clocks on a
22       per-channel basis, then the channel parameter will be ignored. The
23       period_ns parameter specifies the clock's period in nanoseconds. It may
24       left unspecified by using a value of zero. Drivers will ignore the
25       clock period if they already know what the clock period should be for
26       the specified clock (e.g. for an on-board 20MHz oscillator). Certain
27       boards which use a phase-locked loop to synchronize to external clock
28       sources must be told the period of the external clock. Specifying a
29       clock period for an external clock may also allow the driver to support
30       TRIG_TIMER sources in commands while using the external clock.
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32       The clock may be queried with the comedi_get_clock_source function.
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34       This function is only useable on subdevices that provide support for
35       the INSN_CONFIG_SET_CLOCK_SRC configuration instruction.
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RETURN VALUE

38       0 on success, -1 on error.
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AUTHORS

41       David Schleef <ds@schleef.org>
42           Author.
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44       Frank Mori Hess <fmhess@users.sourceforge.net>
45           Author.
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47       Herman Bruyninckx <Herman.Bruyninckx@mech.kuleuven.ac.be>
48           Author.
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50       Bernd Porr <tech@linux-usb-daq.co.uk>
51           Author.
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53       Ian Abbott <abbotti@mev.co.uk>
54           Author.
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56       Éric Piel <piel@delmic.com>
57           Author.
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60       Copyright © 1998-2003 David Schleef
61       Copyright © 2001-2003, 2005, 2008 Frank Mori Hess
62       Copyright © 2002-2003 Herman Bruyninckx
63       Copyright © 2012 Bernd Porr
64       Copyright © 2012 Ian Abbott
65       Copyright © 2012, 2015 Éric Piel
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67       This document is part of Comedilib. In the context of this document,
68       the term "source code" as defined by the license is interpreted as the
69       XML source.
70
71       This library is free software; you can redistribute it and/or modify it
72       under the terms of the GNU Lesser General Public License as published
73       by the Free Software Foundation, version 2.1 of the License.
74
75       This library is distributed in the hope that it will be useful, but
76       WITHOUT ANY WARRANTY; without even the implied warranty of
77       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
78       General Public License for more details.
79
80       You should have received a copy of the GNU Lesser General Public
81       License along with this library; if not, write to the Free Software
82       Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
83       USA.
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88Comedi                            05/11/2017           COMEDI_SET_CLOCK_SOU(3)
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