Thanks, Tim. I'll forward the information to the hardware/firmware developers.
On Mon, Jun 25, 2012 at 7:43 PM, Tim Roberts <t...@probo.com> wrote: > Ellis Whitehead wrote: >> I had hoped that I could make some progress by investigating this >> further myself, but wasn't able to figure much out... >> ... >> Interface Descriptor: >> bLength 9 >> bDescriptorType 4 >> bInterfaceNumber 0 >> bAlternateSetting 0 >> bNumEndpoints 3 >> bInterfaceClass 0 (Defined at Interface level) > > A custom device should have 0xFF here. A class of 0 in the interface > descriptor is reserved in the spec for future use. > > >> Endpoint Descriptor: >> bLength 7 >> bDescriptorType 5 >> bEndpointAddress 0x82 EP 2 IN >> bmAttributes 1 >> Transfer Type Isochronous >> Synch Type None >> Usage Type Data >> wMaxPacketSize 0x0258 1x 600 bytes >> bInterval 1 > > Isochronous endpoints are only supposed to be included in an alternate > setting other than 0. The way you have it here, your device will > reserve bandwidth as soon as it enumerates. In Windows, if your bus > doesn't have enough bandwidth, the device will fail enumeration. By > moving this to an alternate setting, the device will enumerate, and you > can detect in the driver/application that the problem is insufficient > bandwidth. > > -- > Tim Roberts, t...@probo.com > Providenza & Boekelheide, Inc. > > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > libusbx-devel mailing list > libusbx-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/libusbx-devel ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ libusbx-devel mailing list libusbx-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libusbx-devel
