Hi Feng, You are right. Once I fixed that everything works as expected. Thanks for taking the time to review my code.
Best Regards, Eric > -----Original Message----- > From: Tian, Feng [mailto:feng.t...@intel.com] > Sent: Wednesday, June 17, 2015 12:14 AM > To: Eric Wittmayer; edk2-devel@lists.sourceforge.net > Cc: Tian, Feng > Subject: RE: [edk2] USB question: how change to a different alternate setting > of an interface? > > Hi, Eric > > I glance through your code, looks like SelectInterface() has a bug, in which > > You set Request.RequestType = 0x0; but according to USB 2.0 spec 9.4.10, it > should be 0x01 for SET_INTERFACE request. > > So which return value did you get for SelectInterface() invocation? It should > be EFI_DEVICE_ERROR with your original code, am I right? > > Thanks > Feng > > -----Original Message----- > From: Eric Wittmayer [mailto:e...@frescologic.com] > Sent: Wednesday, June 17, 2015 14:06 > To: Tian, Feng; edk2-devel@lists.sourceforge.net > Subject: RE: [edk2] USB question: how change to a different alternate setting > of an interface? > > Hi Feng, > I'm still working to get my environment setup so I can see the debug > messages from the USB stack. > In the meantime, I made a simple test driver that looks for a USB webcam > streaming interface and tries to select the first alternate. The product I'm > writing a driver for isn't a webcam but that is the most common USB device > with alternate settings. > I wasn't sure if I should post the code to the list since it's not code to include > in edk2 so I've made the source available at this link: > https://www.yousendit.com/download/bXBhakluT2IwVW12eE1UQw > > Regards, > Eric > > > -----Original Message----- > > From: Tian, Feng [mailto:feng.t...@intel.com] > > Sent: Thursday, June 11, 2015 12:26 AM > > To: edk2-devel@lists.sourceforge.net; e...@frescologic.com > > Cc: Tian, Feng > > Subject: RE: [edk2] USB question: how change to a different alternate > setting > > of an interface? > > > > 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 > > UsbIo->device 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
