[riot-notifications] [RIOT-OS/RIOT] RFC: UART enhanced settings (#10743)

Yegor Yefremov notifications at github.com
Tue Jan 22 13:51:04 CET 2019

@bluephoton thanks for the testing and bug finding :-) I had only 8-bit capable CPUs so couldn't really test the code with UE and TC bit changes.

`UART_DATABITS_9` mode is for future use. For now, RIOT's UART stack is working with 8-bit arrays. But some UARTs including STM32 allow to write 9 bits into the data register and all these bits will be transferred. The same is true for the reception. Besides STM32 is special because it saves parity bit in the data register and hence requires 9-bit mode for 8E1.

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