comedi_get_clock_source(3) get master clock for a subdevice


#include <comedilib.h>

int comedi_get_clock_source(comedi_t * device, unsigned int subdevice, unsigned int channel, unsigned int * clock, unsigned int * period_ns);




This function queries the master clock for a subdevice, as set by comedi_set_clock_source. The currently configured master clock will be written to *clock. The possible values and their corresponding clocks are driver-dependant. The period of the clock in nanoseconds (or zero if it is unknown) will be written to *period_ns. If the subdevice does not support configuring its master clocks on a per-channel basis, then the channel parameter will be ignored.

It is safe to pass NULL pointers as the clock or period_ns parameters. This function is only useable on subdevices that provide support for the INSN_CONFIG_GET_CLOCK_SOURCE configuration instruction.


0 on success, -1 on error.


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.