这是一篇关于usb的固件程序设计的入门指导，希望大家可以相互借鉴-This is a firmware on the usb entry programming guide, I hope we can learn from each other

LPC 的一个USB驱动源码-The device descr iptor is defined as a USB_DEVICE_DEscr iptOR type. This type is defined in usb_ch9.h Each entry into this structure needs to be the correct length for the data type of the entry.