On Fri, 18 May 2001, Thomas Sailer wrote:
>Dan Streetman schrieb:
>
>> 3.Guaranteed polling
>> Interrupt URBs are (supposed to be) guaranteed to poll at certain intervals.
>
>Where is this guaranteed?
USB specification 1.1, sec 5.7.4 (paragraph under table 5.4)
"The [polling] period provided by the system may be shorter than that desired by
the device up to the shortest period defined by the USB (1ms)."
"The client software and device can depend only on the fact that the host will
ensure that the time duration between two transaction attempts with the endpoint
will be no longer than the desired period."
>If so our implementation is far away from this,
>think about eg. 65ms polling intervals
Ouch.
--
Dan Streetman
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