基于单片机的USB设计方案，该方案包括了电路原理图、PCB布局图、单片机端的源程序和PC端的USB调试助手，该方案内容详尽。-USB single-chip design based on the Program, which includes the circuit schematic, PCB layout, Microcontroller and PC client-side source code of the USB debugging aides, the program detai