comedi_get_clock_source man page

comedi_get_clock_source — get master clock for a subdevice

Synopsis

#include <comedilib.h>

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

Status

alpha

Description

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_SRC configuration instruction.

Return Value

0 on success, -1 on error.

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.

Éric Piel <piel@delmic.com>

Author.

Info

05/11/2017 Comedi reference