stm32: Add support for USART6 on STM32F401 #6830
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STM32F401 has USART6 on PA12/PA11 and PC7/PC6 with alternate function mapping AF08. This can be used, for example, to connect to the Elegoo Neptune 3, where PA12/PA11 are wired to an RJ10 plug going to the stock screen. Signed-off-by: Marius Petcu <[email protected]>
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STM32F401 has USART6 on PA12/PA11 and PC7/PC6 with alternate function mapping AF08. This can be used, for example, to connect to the Elegoo Neptune 3 without soldering to the main board or even opening the case, where PA12/PA11 are wired to a convenient RJ10 plug going to the stock screen.
See the datasheet (Page 45, Table 9. Alternate function mapping):
https://www.st.com/resource/en/datasheet/stm32f401re.pdf
See the Neptune 3's schematic:
https://github.com/TheFeralEngineer/Elegoo-Neptune-board-schematics/blob/main/ZNP%20Robin%20Nano_DW%20V21_001%20SCH_加水印pdf%20·%20version%201_230115_223844.pdf
I only tested this on my Neptune 3. It might work for other STM32s that have USART6, if there are any others, but I only added a Kconfig entry for STM32F401, since that's what I have access to for testing.