说明：  本书着重讲解如何编写、设计一个USB外设并使之与PC通讯所需的代码。本书分析透彻，易于理解，是一本关于USB的不可多得的技术参考书籍。它不仅对初学者有帮助，而且对熟练掌握USB的高级技术人员也受益匪浅
(The book focused on how to write, to design a USB peripheral and communications with the PC code. Analysis of this book thorough, easy to understand, is one of the rare on the USB technology reference books. It is not only helpful for beginners, but also to master the USB high-level technical staff also benefited from)