Thanks Scott and Emile! I am now zero initializing the structure. Everything seems to be working now. Quite a learning experience! Watching the io on the logic analyzer has definitely helped me understand how this all works. Another issue I mentioned in my original post was that I wasn't getting two bytes on the rx like I was expecting. Now I have figured out that len needs to be 3, not 2 (one for the outgoing byte and two for the return). Anyway, thanks again, all is good!
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