Dirk O. Kaar 007e495e0d Implement invert for HardwareSerial (#6816) ...

* Simple i/f to turn on inverted logic on UART0.

* Refactor invert from HardwareSerial to uart

* Final refactoring of invert bits into config bitmap.

* Overload instead of default arg for subclassing.

* Prevent unwanted effects if setting invert on other than UART0 - only that has these flags defined and documented.

2019-11-20 09:17:42 -07:00

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