Article Directory
| platform | Kernel version | Android version |
|---|---|---|
| RK3399 | Linux4.4 | Android7.1 |
USBUsing the tree topology, the host side and the device side USBcontrollers are called a host controller ( Host Controller) and a USBdevice controller ( UDC), only one host on each bus controller, the host is responsible for coordinating
communication between devices and, device and Cannot actively send any messages to the host. In the Linuxsystem, USBthe drive to be viewed from two perspectives, a host-side angle, a side angle device.