[sane-devel] Setup Packet Question

[m. allan noah]

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?

allan

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
>
>

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