本专项练习，主要知识点有三点:1. pcie总线基础知识;https://blog.csdn.net/wangwenxue1989/article/details/91373532https://blog.csdn.net/wenjia7803/article/details/800862842.QSPI协议简介;https://www.cnblogs.com/firege/p/9435349.html3.USB驱动开发之USB四种传输模式;https://blog.csdn.net/zdyueguanyun/article/details/511988874.CAN总线报文浅析;https://blog.csdn.net/liuligui5200/article/details/79030676