623ebf2fb163e01f84a9b6c533a13c91b7c700a0
This fixes serial communication when selecting the PH2/PB10 pins. The chip datasheet (not reference manual) assigns pins to one of two communication function groups (`Func_Grp1/2`). Pins in group 1 have access to USART1/2 while group 2 has access to USART3/4. PH2/PB10 belong to group 2 so we now correctly use USART3 for them. Signed-off-by: Boris-Chengbiao Zhou <bobo1239@web.de>
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