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Update interval on high speed isoch transactions

Subject: Update interval on high speed isoch transactions
From: Fabian Renn <email@hidden>
Date: Mon, 20 Jun 2005 20:43:07 +0200
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Hello list-members,

i'm programming a driver for a usb 2.0 audio interface and i need to use low latency frame transactions. The last parameter of a low latency Write/Read command to an Isoch pipe is the update frequency. Yet when i set the update frequency to 1 ms, my frame lists only get updated when the whole transaction has finished. I checked the IOUSBFamily source code and saw that the updateFrequency seems to be ignored if the EPs highSpeedHub flag is false. Is this a bug? Is there a work around?

Greetings from Germany

Fabian Renn

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