Memory/Port IO in LabView 8

[cochenob]

LV 7.1 only offered 8bit Port I/O VI's.  In order to do 32bit memory read/writes I had to download an AccessHW utility.

In LV 8 it looks like this has been fixed...as the Port I/O routines are polymorphic, allowing to switch between 8, 16, or 32 bit use.

However, my application doesn't seem to be responding to this change. 

Are the LV 8 routines really the fix, or should I be looking for another AccessHW utility?

[JLS]

Hello,

The In Port and Out Port VIs should be polymorphic in LabVIEW 7.1 as well (see the attached screenshot).  The VIs should take 16 bit addresses, and read/write 8, 16, or 32 bit signed integers.  Could it be that our application, or the test you ran, only depends on the 8-bits you have previously been reading?

If you can give more details, I'll try to help you further!

Thank you,

Best Regards,

JLS

[cochenob]

My apologies...let me be a bit more specific.

I had downloaded AccessHW library that allowed me to write 32-bit data to 32-bit addresses.

The normal Port IO routines allow 32-bit data, but only 16-bit addressing.

So....Is there a AccessHW library for LV8?

OR...

Do I just need to break it up 16 bits at a time?

[JLS]

Hello,

The documentation for the In Port and Out Port functions in LabVIEW 8.0 specifically indicates that they only accept 16-bit addresses.  If you have a library of VIs that you were using in a previous version of LabVIEW 7.1 to achieve this, you can try making a copy of that library into a new directory, and then mass-compiling the new directory in LabVIEW 8.0.  Also, I'm not sure what hardware interface you are accessing, but you can use NI-VISA to do register level programming - the following may be a useful tutorial if that's an option for you:

Using the VISA Driver Development Wizard and NI-VISA to Register-Level Program a PXI/PCI Device under Windows

http://zone.ni.com/devzone/conceptd.nsf/webmain/ADF3152837E2B4A486256B5600642AC7?opendocument

If this is an option for you, the related links at the bottom of the document linked above may also be useful!

Thank you,

Best Regards,

JLS