Chapter 3
Developing Your Application
©
National Instruments Corporation
3-7
PCI-Based MXI-2 Interfaces for Windows 2000/NT/Me/98
The NI-VISA examples for these tasks are
HighReg.c
and
RdWrt.c
.
Refer to the other examples as you try more advanced techniques. Consult
the
NI-VISA User Manual
or online help for additional information on
these topics.
Table 3-1 summarizes the topics the example programs address. (All VISA
files are in the
VXIpnp\Win
XX
\NIvisa\Examples
directory, in the
subdirectories listed below.)
Note
MAX includes configuration options that affect low-level functions and shared
memory, as well as trigger mappings and other attributes of your VXI system. Refer to the
MAX online help for information regarding these options.
Optimizing Large VXIbus Transfers
For best performance, keep the following in mind when using
viMove()
or
VXImove()
:
•
Make sure your buffers are 32-bit aligned.
•
Transfer 32-bit data whenever possible.
•
Use VXI block access privileges to significantly improve performance
to devices that are capable of accepting block transfers.
Table 3-1.
NI-VISA/NI-VXI Examples
Coverage
NI-VISAExample
NI-VXI Example
(Optional)
Message-Based
Access
General\RdWrt.c
VXIws.c
High-Level
Register Access
VXI-VME\HighReg.c
VXIhigh.c
Low-Level
Register Access
VXI-VME\LowReg.c
VXIlow.c
Sharing Memory
VXI-VME\ShareSys.c
VXImem.c
Interrupt Handling
VXI-VME\AsyncIntr.
c
and
WaitIntr.c
VXIint.c
Trigger Handling
VXI-VME\WaitTrig.c
VXItrig.c
