I've just tried it on 1.8.9 but can't seem to replicate this warning either. Very odd. I've attached an updated HCDotMatrix.cpp & HCDotMatrix.h . Can you copy these over your existing files and give it a try. As I say I can't replicate the error so I don't know if it will fix the warning or not.
HCDotMatrix.cpp
HCDotMatrix.h
You do not have the required permissions to view the files attached to this post.
Comments made by this poster do not necessarily reflect the views of Hobby Components Ltd.