comedi_digital_trigger_enable_levels — set digital trigger level detection
|comedi_t * device,|
|unsigned int subdevice,|
|unsigned int trigger_id,|
|unsigned int base_input,|
|unsigned int high_level_inputs,|
|unsigned int low_level_inputs|
This function enables level detection for a digital trigger on a
subdevice. If the subdevice supports several digital triggers, the
selects one. The
bit fields that enable (1) or disable (0) high and low level
detection on a set of (up to) 32 inputs. The least-significant bit
corresponds to the input specified by the
subsequent bits corresponding to subsequent inputs.
Successive calls to this function have an cumulative effect, which
allows digital triggers to be set up for more than 32 inputs. There
may also be a cumulative effect with calls to
if the digital trigger supports a combination of edge and level
triggering. Due to the cumulative effect, it may be necessary to call
to clear the old settings before reconfiguring the digital trigger
A digital trigger may support edge detection, level detection, both at different times, or both at the same time. If it supports both but not at the same time, configuring level triggers will disable any previous edge triggers, or vice versa.
This function is only useable on subdevices that provide support for
instruction, and only if the digital trigger supports level detection.