RT-Thread Studio stm32f1使能5个串口

#define BSP_USING_UART1 #define BSP_USING_UART2 #define BSP_USING_UART3 #define BSP_USING_UART4 #define BSP_USING_UART5 #if defined(BSP_USING_UART1) #define UART1_TX_PORT GPIOA #define UART1_RX_PORT
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