Roxy-3D 3f0b38ed5d Add Max7219 LED Matrix Debug Support (#7563) ...

* Add Max7219 LED Matrix Debug Support

The Max7219 8x8 LED Matrix's are very helpful for debugging new code.
And for that matter, just trying to maximize printer settings without
causing stuttering.

The displays are very inexpensive (under $2.00 with shipping) and
provide a lot of help when trying to debug complicated code.

* Try to keep Makefile up to date.

2017-08-25 17:03:07 -05:00

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