Specifications

Comedi
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Description
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
0 on success, -1 on error.
5.4.6.8 comedi_set_counter_mode
comedi_set_counter_mode — change mode of a counter subdevice
Synopsis
#include <comedilib.h>
int comedi_set_counter_mode(comedi_t * device, unsigned int subdevice, unsigned int channel, unsigned int mode);
Status
alpha
Description
This function configures a counter subdevice. The meaning of the mode parameter is driver-dependent. If the subdevice does not
support configuring its mode on a per-channel basis, then the channel parameter will be ignored.
It is only useable on subdevices that provide support for the INSN_CONFIG_SET_COUNTER_MODE configuration instruction.
Return value
0 on success, -1 on error.
5.4.6.9 comedi_set_filter
comedi_set_filter — select a filter for a subdevice
Synopsis
#include <comedilib.h>
int comedi_set_filter(comedi_t * device, unsigned int subdevice, unsigned int channel, unsigned int filter);