table of contents
COMEDI_SET_CLOCK_SOU(3) | Comedi reference | COMEDI_SET_CLOCK_SOU(3) |
NAME¶
comedi_set_clock_source - set master clock for a subdeviceSYNOPSIS¶
#include <comedilib.h>
int
comedi_set_clock_source(comedi_t * device,
unsigned int subdevice,
unsigned int channel,
unsigned int clock,
unsigned int period_ns);
STATUS¶
alphaDESCRIPTION¶
This function selects a master clock for a subdevice. The clock parameter selects the master clock, and is driver-dependant. If the subdevice does not support configuring its master clocks on a per-channel basis, then the channel parameter will be ignored. The period_ns parameter specifies the clock's period in nanoseconds. It may left unspecified by using a value of zero. Drivers will ignore the clock period if they already know what the clock period should be for the specified clock (e.g. for an on-board 20MHz oscillator). Certain boards which use a phase-locked loop to synchronize to external clock sources must be told the period of the external clock. Specifying a clock period for an external clock may also allow the driver to support TRIG_TIMER sources in commands while using the external clock. The clock may be queried with the comedi_get_clock_source function. This function is only useable on subdevices that provide support for the INSN_CONFIG_SET_CLOCK_SOURCE configuration instruction.RETURN VALUE¶
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.
COPYRIGHT¶
Copyright © 1998-2003 David Schleef07/06/2012 | Comedi |