说明：  《USB设备驱动开发深度解析》课件PDF版下载，内容涉及有关USB及驱动框架结构简介、USB协议、主机控制器驱动、设备驱动、设备控制器驱动、Gadget驱动等相关知识
(The PDF version of "In-depth analysis of USB device driver development" courseware downloads, related to the introduction of USB and driver framework structure, USB protocol, host controller driver, device driver, device controller driver, Gadget driver and other related knowledge)