stm32中的串口管腳
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USART1_TX ------ PA9
USART1_RX ----- PA10
USART1_CTS ----- PA11
USART1_RTS ----- PA12
USART2_CTS ----- PA0
USART2_RTS----- PA1
USART2_TX ----- PA2
USART2_RX ----- PA3
USART2_CK ----- PA4
USART3_TX ----- PB10
USART3_RX ----- PB11
USART3_CK ----- PB12
USART3_CTS ----- PB13
USART3_RTS ----- PB14
USART4_TX ----- PC10
USART4_RX ----- PC11
USART5_TX ----- PC12
USART5_RX ----- PD2
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