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Chapter 3 Software Overview
NI-VXI User Manual 3-4 © National Instruments Corporation
InitVXIlibrary ()
InitVXIlibrary
is the NI-VXI initialization routine. An application
must call
InitVXIlibrary
at application startup.
InitVXIlibrary
performs all necessary installation and initialization procedures to
make the NI-VXI interface functional. This includes copying all of the
RM device information into the data structures in the NI-VXI library.
This function configures all hardware interrupt sources (but leaves
them disabled) and installs the corresponding default handlers. It also
creates and initializes any other data structures required internally by
the NI-VXI interface. When your application completes (or is aborted),
it must call
CloseVXIlibrary
to free data structures and disable all
of the interrupt sources.
SetDevInfo (la, field, fieldvalue)
SetDevInfo
changes information about the specified device in the
NI-VXI RM table. The field parameter specifies the attribute of the
information to change. Possible fields include the device name,
Commander’s logical address, mainframe number, slot, manufacturer
ID number, manufacturer name, model code, model name, device
class, VXI address space/base/size allocated, VXI interrupt
lines/handlers allocated, protocols supported, and so on. A field value
of zero (0) specifies to change the specified entry with the supplied
structure containing all possible information about the specified device.
You should use this function only in very special situations, because it
updates information in the NI-VXI interface and can affect execution.
At the startup of your application,
InitVXIlibrary
completely
initializes the RM table according to how the RM configured the VXI
system. No initial changes are necessary for VXI devices.
SetDevInfoLong (la, field, longvalue)
SetDevInfoLong
changes information about the specified device in
the NI-VXI RM table. The field parameter specifies the attribute of the
information to change.
SetDevInfoLong
is a function layered on top
of
SetDevInfo
for languages (such as BASIC) that cannot typecast
the fieldvalues of
SetDevInfo
.
SetDevInfoLong
returns only the
fields of
SetDevInfo
that are 32-bit integers. Possible fields include
the VXI address base and size allocated to the device by the RM. You
should use this function only in very special situations, because it
updates information in the NI-VXI interface and can affect execution.
At the startup of your application,
InitVXIlibrary
completely
initializes the RM table to how the RM configured the VXI system. No
initial changes are necessary for VXI devices.