[sane-devel] Setup Packet Question

m. allan noah anoah at pfeiffer.edu
Wed Aug 2 00:21:30 UTC 2006

perhaps the usb sniffer just shows the setup packet in the return data? i 
mean, all those values are listed in the going down part:

Request                 = ff
Value                   = 8440
Index                   = 0000

and then later in the coming back part:

SetupPacket          : 21 ff 40 84 00 00 40 00

i dont think the setup packet actually comes back.

can you try looking for a firmware file on your windows box that looks 
like these data blocks?


On Tue, 1 Aug 2006, Tabor Kelly wrote:

> I feel like I understand almost all of what is happening in this log:
> http://tabor.taborandtashell.net/sane-fs2720u/turned_on.LOG
> However, I don't understand any of the Setup Packets with the bmRequestType 
> of 0x21. They all appear as the URB is "coming back!" But 0x21 is a 
> host-to-device transfer of type class with the recipient being the interface. 
> Is there something about the URBs "going down" and "coming back" that I don't 
> understand?
> Thank You,
> Tabor Kelly

"so don't tell us it can't be done, putting down what you don't know.
money isn't our god, integrity will free our souls" - Max Cavalera

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