comedi_digital_trigger_enable_edges — set digital trigger edge detection
|comedi_t * device,|
|unsigned int subdevice,|
|unsigned int trigger_id,|
|unsigned int base_input,|
|unsigned int rising_edge_inputs,|
|unsigned int falling_edge_inputs|
This function enables edge 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) rising and falling edge
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 edge triggers will disable any previous level triggers, or vice versa.
This function is only useable on subdevices that provide support for
instruction, and only if the digital trigger supports edge detection.