Re: [edk2] Is it possible to support USB Isochronous Transfer in EDK/EDK2 ?

Subject: Re: [edk2] Is it possible to support USB Isochronous Transfer in EDK/EDK2 ?

From: "Tian, Feng" <feng.tian@intel.com>

To: "edk2-devel@lists.sourceforge.net" <edk2-devel@lists.sourceforge.net>

Date: 2010-09-27 18:00:32

Hi, Jensen
  Yes, You can provide yourself implementation to support isochronous transfer through UsbIsochronousTransfer()/UsbAsyncIsochronousTransfer() interface.
  As Isochronous transfer is a periodic transfer, it has a little similar with interrupt transfer. So I think you can refer to the interrupt transfer implementation in Ehci/UsbBus driver.

Thanks
Tian Feng
-----Original Message-----
From: freevanx Q [mailto:freevanx@gmail.com] 
Sent: Sunday, September 26, 2010 6:12 PM
To: edk2-devel@lists.sourceforge.net
Subject: [edk2] Is it possible to support USB Isochronous Transfer in EDK/EDK2 ?

Dear all,

Nice to meet you.

I'm doing some study with one USB device which only support
Isochronous Transfer, however, when I trace the USBIO/EHCI code, I
found the Isochronous Transfer not implement, since I'm not a expert
in USB, so, I'm looking for an advice that is it possible to implement
the Isochronous Transfer base on EDK/EDKII codebase? what't the limit
of Isochronous Transfer with bulk transfer or interrupt transfer?

Thanks.

Jensen

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