Half-duplex UART over a single wire

[Serhii-the-Dev]

Hi 👋
Is a single-pin half-duplex UART mode is planned to be supported, or probably someone is working on this feature?

[bjoernQ]

You can already construct only the TX or RX half with a single pin - e.g. see https://docs.esp-rs.org/esp-hal/esp-hal/0.19.0/esp32c6/esp_hal/uart/struct.UartTx.html#method.new for constructing the TX half with just the TX pin

[Serhii-the-Dev]

Hi @bjoernQ
Thank you for looking into this. Yes, I'm aware of TX/RX-only implementations, however I'm interested in establishing a bi-directional communication over a single wire, in this way a single pin could be both an input and an output, switching the role via a timeframe, ex:
https://blog.dest-unreach.be/2020/04/26/uart-half-duplex-esp32/
https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-reference/peripherals/uart.html

[bjoernQ]

Thanks for the clarification - I misread what you were asking for 👍

[bjoernQ]

I don't think we will get to this anytime soon but a PR introducing support for this is very welcome