stm32/usart: Implement data bit selection #3595
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Implement data bit size selection and add 7-bit mode.
Sizurka
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Currently the
data_bitsfield of STM32 USART configuration is ignored and the USART is always configured for an 8-bit word size. This implements the actual selection of the word size and adds a 7-bit mode (usually seen in combination with parity and ASCII-only protocols).