MechMerlin 410984486b i2c_init update to work with atmega32a boards (#5562) ...

* On i2c_init, enable two wire interface, twi interrupt, and slave
address ACK along with pull up resistors.

* thanks to some testing by drashna, we know that setting TWI doesn't work for all boards. Putting the new code into an ifdef block

2019-04-06 17:30:48 -07:00

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