USB数据流模型
<<USB Specification11>>
<< USB Specification20>>
<< Linux Device Drivers, 3rd Edition>>
<< Universal Serial Bus>> http://wiki.osdev.org/Universal_Serial_Bus#What_this_text_covers
- 从不同的层次观察USB系统
- 从不同的层次更细节地观察USB系统
每个端点都是一个简单的连接点,或者支持数据流进设备,或者支持其流出设备,两者不可得兼。
- Usb通信流
- 内核里对usb设备的抽象
* - devices have one (usually) or more configs;
* - configs have one (often) or more interfaces;
* - interfaces have one (usually) or more settings;
* - each interface setting has zero or (usually) more endpoints.