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Fix digitalRead for controllers with big flash #512
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Memory usage change @ 29a3fd8
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Memory usage change @ 35edd08
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avr-gcc uses 16-bit type for the pointers. Therefore for when PGM data moves above 64k, it can't be read with pgm_read_word(name).
It can be fixed by retrieving full data address with pgm_get_far_address.
This patch fixes digital pin-related macros, that failed to work on AVR Mega with firmware larger than 64k.