虚拟uart ,有了它,你不要再连接硬件了,也不用去受硬件没连好的痛苦了. 你可以在没有硬件的环境下很方便的调试uart-The virtual uart, With it, you will not be connected to the hardware, and is not taken up by the hardware, not even a good pain. You can no hardware environment is very convenient to debug