Thanks for the quick reply Alan. Alan Stern wrote: > On Wed, 13 Sep 2006, Phil Endecott wrote: >> Has anyone ever tried to couple a device controller (gadget) and a host >> controller on the same processor to make a transparent feed-through USB >> channel?
> Other people have suggested this in the past. Unfortunately it can't be > done. A USB bus analyzer needs to receive every packet on the bus, but > a USB device controller will receive only packets addressed to itself. Maybe I shouldn't have said "analyser"; a real analyser would be a passive device, while what I'm describing certainly isn't. I imagine a "real" device being plugged in to this "analyser" which clones its descriptors on its device interface. So it could only work with one thing plugged in (unless there is some way to make the device interface appear to be a hub). > There are other technical reasons why this can't be made to work, such as > the electrical constraints on voltage, current, and impedance in the USB > signal lines. Can you elaborate on this? Cheers, Phil. ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
