主程序功能为51单片机从USB总线读取两个字节数据，计算两个数据的和。另外本文还给出了CH372的主端点、辅助端点之间数据上传下传的子程序，供读者参考。 -The main program functions for 51 single-chip two bytes of data to calculate the two data and read from the USB bus. In addition, the article also gives CH372 primary end