Feng, Thanks for your quick response. I'll turn on the debug printing tomorrow and let you know what I get.
Eric > On Jun 11, 2015, at 12:26 AM, Tian, Feng <feng.t...@intel.com> wrote: > > Hi, Eric > > It should be enough to get alternative setting through these two steps you > did. > > Could you let me know whether you saw this debug message " UsbSelectSetting: > setting %d selected for interface %d " got printed ? and which values are in > the printed message? > > Thanks > Feng > > -----Original Message----- > From: Eric Wittmayer [mailto:e...@frescologic.com] > Sent: Thursday, June 11, 2015 14:20 > To: edk2-devel@lists.sourceforge.net > Subject: [edk2] USB question: how change to a different alternate setting of > an interface? > > Hello all, > I'm new to the list and to edk2/uefi. I'm working on a USB device driver for > a device that has interrupt endpoints declared on interface alternate #1. So > the default interface descriptor has zero endpoints and the alternate 1 > interface descriptor has 2 endpoints. I am able to use > UsbIo->UsbControlTransfer to send a Set Interface command to the device > UsbIo->and > I can see on my usb analyzer that it does get sent. > After that I call UsbIo->UsbGetInterfaceDescriptor again to get what I > expected was the interface descriptor for alternate #1 but I get back the > same descriptor as before I set the interface. > Looking through the code I can see in the XhciDxe code for XhcControlTransfer > that it handles updating the xhci controllers representation of the endpoints > when it sees the select interface command but I'm not sure if there is > something else I need to do in order to update the data returned by > UsbGetInterfaceDescriptor. > > How do I get the correct descriptors for the newly active alternate setting? > Will they have a different UsbIo protocol handle and if so how do I find it? > > Thanks for any help. > Eric > > > > ------------------------------------------------------------------------------ > _______________________________________________ > edk2-devel mailing list > edk2-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/edk2-devel ------------------------------------------------------------------------------ _______________________________________________ edk2-devel mailing list edk2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/edk2-devel
