niHSDIO_ConfigureDigitalEdgeRefTrigger
Specific Function
C Function Prototype
ViStatus niHSDIO_ConfigureDigitalEdgeRefTrigger (ViSession vi, ViConstString source, ViInt32 edge, ViInt32 pretriggerSamples);
Purpose
Configures the Reference trigger for edge triggering in an acquisition. If the Reference trigger asserts before all the pretrigger samples are acquired, then it is ignored. This function is only valid for acquisition operations.
Parameters
| Name | Type | Description |
|---|---|---|
| vi | ViSession | This handle identifies your instrument session. vi was obtained from niHSDIO_InitAcquisitionSession. |
| source | ViConstString | You may specify any valid source terminal for this trigger. Trigger
voltages and positions are only relevant if the source of the trigger is
from the front panel connectors. Refer to NIHSDIO_ATTR_DIGITAL_EDGE_REF_TRIGGER_SOURCE for possible values. |
| edge | ViInt32 | Specifies the edge to detect. Defined Values NIHSDIO_VAL_RISING_EDGE (12)—Rising edge trigger. NIHSDIO_VAL_FALLING_EDGE (13)—Falling edge trigger. Default Value: NIHSDIO_VAL_RISING_EDGE |
| pretriggerSamples | ViInt32 | Specifies the number of necessary pretrigger samples before the Reference trigger is acknowledged. |