feat: add framed uart support#26198
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packet link layer over byte level uart. owns tx queue, ack await with retry on timeout, rx framer. caller provides protocol callbacks: frame-start detect, complete check, integrity verify, ACK match, send-ACK, dispatch. opt in via UART_FRAME_DRIVER_REQUIRED. When set to yes, UART driver is gonna be auto-pulled and uart_frame.c built. it is off by default and has no impact on existing keyboards. Signed-off-by: Roman Kuzmitskii <roman@damex.org>
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Description
adds packet link layer over byte level uart.
owns tx queue, ack await with retry on timeout, rx framer.
caller provides protocol callbacks:
opt in via UART_FRAME_DRIVER_REQUIRED.
When set to yes, UART driver is gonna be auto-pulled and uart_frame.c built.
it is off by default and has no impact on existing keyboards.
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Issues Fixed or Closed by This PR
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