RT-Thread Stm32f103开启UART2（DMA接收及轮询发送） 使用RT-Thread Studio

RT-Thread Stm32f103开启UART2 使用RT-Thread Studioweb 1. 使用RT-Thread Studio新建RT-Thread项目 2. 修改dricer->doard.h *STEP 1, define macro define related to the serial port opening based on the serial port number

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