I don't have anything attached on the bus to snoop the signals...we're planning to use the beagle analyzer...but it'll take its own sweet time for procurement...so wanted to know if I can do something in the meanwhile... thanks, -mandeep On Thu, Jun 18, 2009 at 7:58 AM, Rajaram R<rajaram.officemail@xxxxxxxxx> wrote: > Do you have a tracer that you can connect between device and host ? Is there > any activity on wire ? > > On Wed, Jun 17, 2009 at 9:41 PM, Mandeep Sandhu > <mandeepsandhu.chd@xxxxxxxxx> wrote: >> >> Hi all, >> >> We're facing a problem while trying to emulate a USB-ether device in >> software (using usb/gadget/ether.c). >> >> We're connecting the tablet to a linux PC as host. The device enumeration >> happens successfully. After this the host side driver sends some vendor >> specific >> commands on the control EP (these commands are for setting up the device >> which we're trying to emulate). >> >> After enumeration the following EPs are setup (apart from control EP0): >> EP1 IN/OUT- Bulk >> EP2 IN - INTERRUPT >> >> The host then polls the interrupt EP and checks for link status from the >> device. >> >> This is where we get stuck, i.e we see the host putting a interrupt IN >> packet on >> EP2, but there's no indication of it coming to the device (tablet). >> >> We've put debugs in the musb/tusb core to see if the peripheral controller >> is at >> least getting an interrupt. Debugs in tusb6010.c::tusb_interrupt() show >> that we >> are _always_ getting interrupts for EP0 and never for any other EP. The >> musb->int_tx value is always 1 ! >> >> This is strange because usbmon debugs on the host show that the host has >> polled >> the interrupt EP, but somehow the peripheral controller is not getting >> any interrupt >> for this EP. >> >> I'm not very experienced with USB device controllers, so any pointers on >> this >> will really help. >> >> TIA, >> -mandeep >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-usb" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
