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tomazas committed Apr 26, 2015
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* next 64 bytes - (8x8x8 bits) of LED light states
* one byte - controls a LED row (8 LEDs)
* can be any value in range: 00-FF (i.e. 00 - all 8 LEDs in row are off, FF - all 8 LEDs are on)
* a single line (e.g. 00 00 00 00 00 00 00 FF) denotes a 64 LED layer

`Implementation note:` to save energy/current consumption only a single layer (64 LEDs) in a LED cube is ON at one time. This is done for all layers and so fast (using a hardware timer), that the human eye does not recognize this. This hack allows to view the cube (all layers) as fully lit.