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!

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