Are there any simple SPI master/slave demo sketches specifically for the Arduino Zero? The Internet has plenty of short simple sketches for UNO class boards (without an embedded ESP8266), but the sample IDE examples for SPI compile only for the newer NodeMCU, Wemos, and Adafruit Huzzah boards. The IDE doesn't even show any sample SPI sketches when the IDE is configured for the Zero.
Thanks !!
I've written working SPI slave only code for the Seeeduino XIAO (similar chip). You might find it useful: