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Chapter 3 Software Overview
NI-VXI User Manual 3-56 © National Instruments Corporation
GetTrigHandler (line)
GetTrigHandler
returns the address of the current trigger handler for
the specified VXI trigger line.
SetTrigHandler (lines, func)
SetTrigHandler
replaces the current trigger handler for the specified
VXI trigger lines with an alternate handler.
WaitForTrig (controller, line, timeout)
You can use the
WaitForTrig
function to suspend operation until it
receives a trigger configured by the
EnableTrigSense
function.
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. You can use
WaitForTrig
as an alternate method for receiving sensed triggers by
having the caller wait until the trigger occurs instead of installing a
callback handler. The current handler is invoked regardless of whether
a
WaitForTrig
call is pending.
Map Trigger Functions
You can use the NI-VXI map trigger functions as configuration tools
for multiframe and local support for VXI triggers. You can configure
the triggering hardware to route specified source trigger locations to
destination trigger locations by using the
MapTrigToTrig
and
UnMapTrigToTrig
functions.
MapTrigToTrig (controller, srcTrig, destTrig, mode)
MapTrigToTrig
configures triggering hardware to route specified
source trigger locations to destination trigger locations with some
possible signal conditioning. The possible values for source or
destination locations are the TTL trigger lines, ECL trigger lines,
Star X lines, Star Y lines, or miscellaneous external sources.
Miscellaneous external sources include front panel trigger ins, front
panel trigger outs, local clocks, and crosspoint switch locations. The
mode parameter specifies how the line is to be routed to the
destination. You can manipulate the line in various ways, including
inverting it, synchronizing it with the CLK10, or stretching it to a
minimum time. In this way,
MapTrigToTrig
can be used as a simple
map from an external source to a trigger line, or as a complex