对usb技术的详细总结，这个章节是usb的基础知识，后续为usb host控制器协议、linux下usb架构以及linux的gadget结构。-Usb technology detailed summary of this chapter is to the usb basics, and follow-up usb host controller agreements, linux under usb gadget structure of the architecture and Linux

BeagleBone Black Wireless is based on the extremely successful open-source hardware design of BeagleBone Black, a high-expansion, maker-focused, community-supported open hardware computer, created by the BeagleBoard.org Foundation. BeagleBone Blac