Am Sonntag 12 April 2009 13:32:23 schrieb Tilman Schmidt: > On Sun, 05 Apr 2009 16:02 -0700, "David Brownell" <david-b@xxxxxxxxxxx> > > wrote: > > Why is it assuming that altsetting has endpoints? > > If that interface uses ISO transfers, then the > > first altsetting must not have any endpoints... > > I'm not sure I understand you correctly. the way I read the spec, the > first altsetting may well have endpoints, just no isochronous ones. > Namely, I have a device which uses isochronous transfers and which in > its fully functional altsetting 3 has (in addition to EP0 of course) > two interrupt endpoints (one in, one out) and four isochronous > endpoints (two in, two out). In altsetting 0, the isochronous > endpoints are absent, in accordance with the standard. The interrupt > endpoints, however, do exist in every altsetting. Please post "lsusb -v" Regards Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
