In order to port the WinKeyer clone code to the ATtiny85, I had to face the half-duplex issue of software serial library. Every software serial library use the interrupt and interrupt service routine, so it can not send and receive data simultaneously. But in WinKeyer, the serial echo is an important feature, I added echo-back queue in code and process the echoing job in idle time.
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WinKeyer Minimal Clone on ATtiny85
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