STM32F103RCT6 封装是LQFP64，有5个串口PIN16 ==PA2 ==USART2.TX，
PIN17 ==PA3 ==USART2.X，
PIN29 ==PB10 ==USART3.TX，
PIN30 ==PB11 ==USART3.TX，
PIN42 ==PA9 ==USART1.TX，
PIN43 ==PA10 ==USART1.TX，
PIN51 ==PC10 ==UART4.TX，
PIN52 ==PC11 ==UART4.TX，
PIN53 ==PC12 ==UART5.TX，
PIN54 ==PD2 ==UART5.TX，
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