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Chapter 3      Software Overview

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NI-VXI User Manual

AcknowledgeTrig

 performs the required trigger acknowledgments

for the ASYNC or SEMI-SYNC VXI-defined protocol, as configured
via the 

EnableTrigSense

 function.

DefaultTrigHandler

 is the sample handler for the receiving

acknowledges and sensing triggers, and is automatically installed after
a call to 

InitVXIlibrary

. After a call to 

EnableTrigSense

 for a

particular VXI trigger line protocol, the trigger handler for a specific
trigger line is called when the sourced trigger is sensed from the
sourcing device. If the configured VXI trigger protocol requires an
acknowledgment (either ASYNC or SEMI-SYNC), you must call the

AcknowledgeTrig

 function to perform the acknowledgment.

DefaultTrigHandler

 calls the 

AcknowledgeTrig

 function if the

type

 parameter specifies that an acknowledge interrupt occurred.

Otherwise, 

DefaultTrigHandler

 performs no operations.

DefaultTrigHandler2

 is a sample handler for receiving

trigger interrupt sources similar to 

DefaultTrigHandler

.

DefaultTrigHandler2

 performs no operations. Any required

acknowledgments must be performed by the application.

DisableTrigSense

 unconfigures and desensitizes the triggering

hardware that was enabled by the 

EnableTrigSense

 function to

generate interrupts when any VXI-defined trigger protocol is sensed on
the specified trigger line.

EnableTrigSense

 configures and sensitizes the triggering hardware

to generate interrupts when the specified VXI-defined trigger protocol
is sensed on the specified trigger line. When 

EnableTrigSense

 has

configured and enabled the triggering hardware to generate interrupts,
and the specified trigger protocol is sensed, a local CPU interrupt is
generated. The trigger handler installed is automatically called when a
trigger interrupt occurs.