On Mon, 17 Dec 2018 at 14:18, Charles Steinkuehler
<char...@steinkuehler.net> wrote:

> That sounds like a floating signal.

And you were right. It appears to work now. I hadn't read the docs
properly and thought that SPI.beginTransaction was the new
SPI.begin().
Not so!
So my SPI pins were not in the correct pin modes.
(bit clearly were still somewhat working, sometimes)

https://www.arduino.cc/en/Reference/SPIBegin

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916


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