Bit-bang serial driver for low baud rate (~19.2K) devices.
* This driver is designed to be method-compatible with the FullDuplex serial object, allowing it to be used when high speed comms or devoting an independent cog for serial I/O is not necessary.* Bi-directional communication on the same pin is also supported.
- Fixed Init method to initialize txPin (if specified and not bi-directional communication). Previous versions did not initialize txPin until first transmission, leaving the tx signal in an unknown state until then.
- Updated to fix rx method bug where uninitialized variable would mangle received byte.