That is alla amazing, and very impressive. Thanks for doing it all, and sharing.

A super-picky note from the embedded developer corner: a serial port with a clock signal is not asynchronous, so the "A" in UART becomes wrong.

Peripherals capable of doing both, which are common on modern microcontrollers, are often called USARTs, which of course means universal synchronous/asynchronous receiver/transmitter. Other names for more fancy capabilities are also common.