robert-hh 988b6e2dae renesas-ra: Add the UART methods uart.txdone() and uart.flush(). ...

This required to add two functions down the stack to uart.c and ra.sci.c.

- One for telling, whther the transmission is busy.
- One for reporting the size of the TX buffer.

Tested with a EK-RA6M2 board.

2022-12-15 12:09:34 +01:00

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