NIHSDIO_ATTR_HWC_HARDWARE_COMPARE_MODE

Specific Attribute

Data type	Access	Applies to	Coercion	High-Level Functions
ViIn32	R/W	None	None	None

Description

Configures the device to compare expected data and actual data in real-time. This attribute must be set to the same value in both sessions.

Note  To use this feature you must have an acquisition and a generation session running concurrently.

When you set this attribute to either NIHSDIO_VAL_HWC_STIMULUS_AND_EXPECTED_RESPONSE or NIHSDIO_VAL_HWC_EXPECTED_RESPONSE_ONLY, the generation engine sends expected data to the acquisition session to compare against acquired data.

Use the niHSDIO_WriteNamedWaveformWDT function to write expected data to the device. The device drives any values of 0, 1, or Z in the waveform, while values of H, L, or X are treated as expected data values.

This property must be set before data is written to the device.

NIHSDIO_VAL_HWC_DISABLED (77)	Comparison engine is disabled. Any attempts to write expected response data to the device results in an error.
NIHSDIO_VAL_HWC_STIMULUS_AND_EXPECTED_RESPONSE (78)	Device drives and compares data in the same session. You can download waveforms with drive and/or compare data. All digital states are supported in this mode.
NIHSDIO_VAL_HWC_EXPECTED_RESPONSE_ONLY (79)	Device does not drive any data, it only acquires and compares. You cannot download drive data. A generation session downloads the expected waveform. Selecting this value pauses the generation lines to synchronize the acquisition and generation sessions.