https://forum.arduino.cc/t/arduino-mega-2560-23s17-spi-problem/704100
Arduino Mega 2560 / 23S17 / SPI Problem - Networking, Protocols, and Devices - Arduino Forum
Apr 9, 2021 - Dear All, I'm totally new to SPI so apologies in advance. I've tried and googled over a week now, bust can't get my Mega 2560 to talk to my 23S17 Expander via...
arduino meganetworking protocolsspi