Hi all, I am working with a sbRIO 9639 and followed what I believed to be the recommended procedure to write to block memory from the host via (see attached host block diagram and FPGA implementation). However the running the aforementioned code does not actually change the memory and what is accessed instead is the just the previous values (which are persistent). On the other hand I am able to write to block memory directly from the FPGA vi (one by one) and obtain the results I would expect if I then run from the host after writing the correct values. In fact I can now see these values from the host using the read/write protocol. Does anyone have any idea about the cause of this problem? I have followed the implementation to write and read from memory in the examples but have not found any success.

I can't possibly comment on NIs code because I don't know who wrote it, why and for what purpose. You can write to the control whenever you want, but if you don't actually read it again (polling) then you're never going to see the newer values. While polling should be avoided on Host programs, it's kind of unavoidable and normal on FPGA. Put the entire program inside another loop and try again.

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Problems writing to block memory from host

Solved!

The same vi should also work on the host pc.

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Problems writing to block memory from host

Re: Problems writing to block memory from host