说明：  该文档为特权同学EMP240开发板的电路连接原理图和使用说明，仅供大家学习使用，如有需要请联系特权同学，相关资料；
(The documentation for the privileged students EMP240 development board circuit connection diagram and instructions, only for everybody to learn to use, if necessary please contact privileges classmate, relevant information)