On 3 Apr 2002, Dmitri wrote:
>On Wed, 2002-04-03 at 20:06, Daniel Cruz wrote: > >> Please enlight me on that, why is USB time critical?... I understand is not >> greatly fast, but there si anything else?.. > >If you use Isoc pipe it will probably be serviced around few >milliseconds, but in theory the request can be just dropped on the >floor, USB is designed this way. > >If you use other pipes then the transfers can take longer, depending on >the type of transfer. Maybe 10 ms, maybe even 100 ms ... These transfers >are guaranteed to succeed, but no obligations on "when" part... That is not true, for INT pipes the USB spec clearly states the polling interval cannot be greater than what is requested. So the timing must be at least the ep's bInterval. -- Dan Streetman [EMAIL PROTECTED] -------------------------------------------------- 186,282 miles per second: It isn't just a good idea, it's the law! _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
