1 The serial port program lacks clock enable. Enable the clock before configuring the peripherals:
Keywords：USART3
Reference address：USART3 PD8 PD9 remapping multiplexing problem
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_AFIO,ENABLE);
2 PD8 PD9 should be fully mapped.
USART3_REMAP[1:0]: USART3 remapping
These bits can be set to '1' or '0' by software to control the CTS, RTS, CK, TX and RX multiplexing functions of USART3 on the GPIO terminal.
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