Re: Need architecture for usb to usb bridge

On Jul 27, 7:51 am, Theo Markettos <theom+n...@xxxxxxxxxxxxxxxxxxxxxx>
wrote:

If simple 'filtering' is what's required, I wonder if that can be done
without implementing a full host USB stack.  Normally the host talks to the
target mass storage device directly.  But if the host tries to write data
blocks, the filter intercepts the write command, doesn't pass it on to the
device but returns an error result instead.

Obviously it'll be more complex than that (effectively it's buffering and
changing packets on the wire, through several layers of abstraction) but
that would make it seem more like a slave device rather than a host.  The
big question is whether tampering with the results like this will confuse
hosts or devices, and if you can do it without upsetting the protocol.

Hmm, how about instead of filtering out the writes, changing their
destination address to something impossible? Then the mass storage
device would do the complaining, and know it had hopefully taking care
of any synchronization issues.
.

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