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Chapter 3      Software Overview

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3-49

NI-VXI User Manual

frame (for an embedded CPU) or the first extended controller (in an
external CPU situation).

EnableVXItoSignalInt

 is used to sensitize the application to

specified interrupt levels being processed as VXI signals. After calling

InitVXIlibrary

, the application can sensitize itself to interrupt

levels for which it is configured to handle. 

RouteVXIint

 specifies

whether interrupts are to be handled as VXI/VME interrupts or as VXI
signals (the default is VXI signals). An 

EnableVXItoSignalInt

call enables interrupt levels that are routed to VXI signals. Use

DisableVXItoSignalInt

 to disable these VXI interrupts. Use

EnableVXIint

 to enable interrupts not routed to VXI signals. A -1

(negative one) or local logical address in the controller parameter
specifies the local embedded controller or the first extended controller
(in an external controller situation). If a 

RouteVXIint

 call has

specified to route a particular VXI/VME interrupt level to the VXI
signal processing routine and the global signal queue becomes full,

DisableVXItoSignalInt

 is automatically called to inhibit these

VXI interrupts from being received from the appropriate levels.

EnableVXItoSignalInt

 is automatically called to enable VXI/VME

interrupt reception when 

SignalDeq

 is called.

GetVXIintHandler

 returns the address of the current VXI/VME

interrupt handler routine for the specified interrupt level. If interrupts
are enabled (via 

EnableVXIint

), the callback handler for a specific

logical address is called. You must first call 

RouteVXIint

 to route

VXI/VME interrupts to the callback handler (as opposed to the signal
processing routine). A default handler, 

DefaultVXIintHandler

, is

automatically installed for every applicable VXI interrupt level when
the 

InitVXIlibrary

 function is called.

RouteVXIint

 specifies whether status/ID values returned from a

VXI/VME interrupt acknowledge cycle are routed to a VXI/VME
interrupt handler or to the VXI signal processing routine. The function

RouteVXIint

 specifies whether the status/ID value should be handled

as a signal or handled locally by a VXI/VME interrupt handler. Two
methods are available to handle VXI signals. Signals can be handled
either by signal handlers (as signals) or by queueing on a global signal