Increased transmission speed #27
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allows for continuous sending @76800 baud (not 115k)
(works nearly for 115k, downto 300)
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Updated init() for better readability and debugging. Support prescale/1024 (Mega T1-T5).
Conditionally increased delay before triggering next interrupt from the ISR. This change allows to transmit contiguous streams @ 76800 baud. There exists still an issue with 115k, when the first transmitted bit of the next character is 1 (different from start bit).
Improved again, now works from 300 to 76800 baud. Still not for 115k, not at all for <= 150 :-(