A thought - reversable serial on the DD-series

[SpenceKonde]

On the DD series, for the first time, it is possible to have an event channel output on the RX pin of a USART.

And we can already RX on either the RX pin, or the TX pin. You can use a CCL to grab TX from a USART, and pipe it's output through an event chanell to a pin.

So now imagine a string of devices. The first one's TX is connected to master. and it's RX tothe TX of the next slave. in a string.

It can now talk bidirectionally with the master like normal with ODME and LBME set,

And it can unset LBME, and receive from the other one... but with a DD using certain pin options, it could also TALK to the next device down the line. It would just need a resistor in series because it can't do it open-drain (god I wish that was an option with the event outputs)