Chapter 3 Software Overview
© National Instruments Corporation
3-55
NI-VXI User Manual
AcknowledgeTrig (controller, line)
AcknowledgeTrig
performs the required trigger acknowledgments
for the ASYNC or SEMI-SYNC VXI-defined protocol, as configured
via the
EnableTrigSense
function.
DefaultTrigHandler (controller, line, type)
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 (controller, line, type)
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 (controller, line)
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 (controller, line, prot)
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.
