RKTK API Docs
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Uart half duplex split driver
This module includes a half-duplex communication driver for split keyboard-to-keyboard communication using UART. Since this driver is a half-duplex communication where the transmitter and receiver share pins, a TRRS cable is not required for connection; a TRS cable is sufficient. However, due to its nature, it is relatively prone to transmission and reception errors. I checked on the receiving side and confirmed that reception failed at a rate of about 0.3%. This is a relatively high figure for a keyboard.