Pass value to FPGA I/O node in FPGA.vi from Host.vi

How do you pass a different value to the FPGA.vi I/O node from the Host.vi?? In the FPGA I made the I/O node a "control" but when I try to use Read Write control in my host none of the I/O show up in the drop down selection. All my booleansare there. See screen capture.
Thanks..
Solved!
Go to Solution.
Attachments:
fpga I_O.jpg ‏124 KB
fpga I_O.jpg ‏124 KB

nathand wrote:
Ben wrote:
You have to recompile the FPGA code and then relink to the new version for the control to show up. The "wire" has the infor on the control and if you are using an wire that did not know about the new control...
By the way, if you're using a reference to an FPGA VI (and not a bitfile), there's no need to recompile to pick up changes to the controls on the front panel of the FPGA VI. However, IO node references do not propagate to the host VI. The reason for FPGA IO node controls is for subVIs within an FPGA design, not for host-to-FPGA communication.
Unfortunately, this really is a bit misleading. When I was first learning FPGA, I got caught up in this when I tried to use a config file to set the IO nodes up like you would for DAQmx. I understand why it isn't really possible, I just wish there was some way it would notify the programmer of this. I even took the FPGA class from NI and I don't think they ever mentioned this was not possible.
I do like the idea of routing the signals using a case structure though, that's a good idea. The only issue is if you want to have all channels available without a recomile, you have to acquire from them all even when unused, just in case the user decides to use them down the road.
CLA, LabVIEW Versions 2010-2013

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