Add SS declaration to Arduino.h for SD lib compatibility#72

Merged

oclyke merged 3 commits intomasterfrom

Oct 14, 2019

Commits on Oct 11, 2019

Add SS definitions to work with SD examples
nseidle
committed
Move SS pin define to core file
Nathan Seidle
committed

Commits on Oct 14, 2019

reduce odds of a silent failure when acidentally invoking arbitrary SS pin
oclyke
committed