Thank you! I looked at the source code yesterday, and found both sets of descriptors :-) 在 2005-12-24六的 10:14 -0500，Alan Stern写道： > On Sat, 24 Dec 2005, jinzhucheng wrote: > > > We know HI-speed usb peripheral controller(ISP1581.net2280...) supports > > operation with either a full-speed or high-speed host and they have > > ability to switch between Full-Speed and High-Speed > > terminations/signaling. > > but in gadget driver(fsg, serial, ether...), when we define endpoint > > descriptor, we will set maxpacketsize is 512 for this hi-speed > > controller. so when device connect to full-speed host, it will work > > failed, is it right or not? thank you! > > I can answer this question. > > Gadget drivers define _two_ sets of endpoint, interface, and configuration > descriptors. One set gets used when operating at high speed, with > maxpacket = 512. The other set gets used when operating at full speed, > with maxpacket = 64. > > Look at the source code for those drivers and you will see both sets of > descriptors. > > Alan Stern > >
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