host端需要的硬件是：USB host controller and a root hub with one or more USB ports. host端需要的硬件是：USB host controller and a root h
阅读背景：
usb通信时HOST和DEVICE要做的事情
来源：互联网
host端需要的硬件是：USB host controller and a root hub with one or more USB ports. host端需要的硬件是：USB host controller and a root h
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