The Nordic is talking to the DW module. I had a few false starts at getting the pin assignments correct. I seem to have word-blindness where schematics are concerned! I ended up laboriously tracing the wiring to make quite sure I had it right, and even then I got it wrong… but after two attempts, it seems like it has to be working.
The manual says that if I read from register 0 I should get to see the Device ID which ought to be in the format: RIDTAG, MODEL, VERSION, REVISION. According to the manual I should see the following: 0xDECA, 0x01, 0x3, 0x0.
The bytes are sent in reverse order for some reason I have yet to fathom, but at least it is talking. Yay!
