Using global variables with FPGA VI and an main VI

[blackbird307]

First off, I am fairly new with labview.

I am wondering if it was possible to obtain data from an FPGA VI so that it can be read in a regular VI.

I tried using global variables, but the data doesn't update.

Basically what I tried doing was using a Global Variable and have it in write mode in the FPGA, and then have it in read mode on the regular VI with an indicator attached to it. But I am not getting data out of it, it just stays zero. I intend to use this data as part of my main program.

Is there a way I can achieve this, or is there another method?

Thanks!

[Row-L]

Hi blackbird307,

The best way to communicate between FPGA and your main VI depends on what type of data you are trying to send. In the RIO architecture, it is generally best to use the FPGA and RT OS together wuith network-published variables with RT FIFOs enabled, for simple monitoring of values. If you need to stream and save large amounts of data,  you can use Network Streams. For more detailed information about how to set up these variables or data streams, please refer to the cRIO Developer's Guide: (http://www.ni.com/pdf/products/us/fullcriodevguide.pdf). In particular, Chapter 4 should be very helpful in showing how to set up inter-process communication.

If you are using hardware other than a cRIO, please let me know. The general VI architecture should be similar however, if using an R Seires PXI card with an RT OS controller.

Hope this helps. Thank you for choosing NI, and best of luck!

[crossrulz]

To pass data from and FPGA, you need to use a DMA FIFO or communicate over the front panel interface.

Since you are new to LabVIEW, I would highly recommend you try to get some training.  The Self Paced Training that NI offers should include FPGA.  After getting some of the basics of LabVIEW, go through that course.

3 Hour Introduction
6 Hour Introduction
LabVEW Basics
Self Paced training for students
Self Paced training beginner to advanced, SSP Required
LabVIEW Wiki on Training
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