added signal invert and mode selection (rx/tx)

PaulStoffregen / AltSoftSerial

Software emulated serial using hardware timers for improved compatibility

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Open bikemike opened 8 years ago

bradanlane commented 5 years ago

I had a need for inverting one side of the data. I pulled this code from @bikemike and it is working well.

vlad072 commented 4 years ago

I need to invert TX only, to work through a transistor switch. how to do it?