On Monday 23 April 2007, Steve Calfee wrote: > At 09:28 AM 4/23/2007, Gene Heskett wrote: > >Hi Greg & company; > > > >Is there available, for a reasonable price, a usb dongle that would > >do nothing > >but echo the packet back to the src so that some sort of a handle on the > >latency could be measured/obtained? > > I doubt one is available. You could reprogram any cypress fx2 high > speed device to do it, I don't know what commercially available > devices exist though.
Actually, one configuration of the "gadget zero" driver provides such a loopback functionality. None of the Linux test software uses it, but it was provided so Linux could drop into an existing customer test harness that worked that way. So if you could find the Yahoo store selling net2280evb PCI cards, most any Linux PC could do that. (Cost was ca. $US 100 ISTR.) Or there are boatloads of embedded Linux platforms which can do the same thing, especially at full speed. (Example, www.gumstix.com can sell you small board stack for ca $US 250, including USB and Ethernet connectivity.) Another option would be getting an "at90usbkey" and tweaking the stock firmware ... that's an Atmel demo kit for an AVR 8-bit micro, costs about $50 now (www.digikey.com) and the size of a gumstick. - Dave ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
