g...@novadsp.com wrote: >> please be aware that the Windows driver we use at the >> moment doesn't support isoch (see "Known Restrictions" for WinUSB at >> [1]), > Indeed. Why on earth make WinUSB without isoch support.
Microsoft's answer is because (1) it's hard to abstract it in a reasonable and bullet-proof way, (2) the performance penalty of handling things in user mode matters in isochronous use cases, and (3) the only uses for isochronous are audio and video, and those device classes can't be done in user-mode in Windows anyway. When news of this limitation first came out 5 or 6 years ago, the USB team at Microsoft sent out a blast saying "We will add this if you have a legitimate use case for it. Let us know." No one has let them know, or at least no one that matters. -- 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
