|
I am trying to access some class defined descriptors on a USB
device I am working with. I assume that the StandardRequest class
should be used to get these descriptors, but I have not been
successful. When I call the getDescriptor() method I receive a
"javax.usb.UsbStallException: Error submitting IRP :
UsbStallException" Here is my code: try { UsbDevice usbDevice = connection.getDevice(); byte [] buf = new byte[1000]; StandardRequest.getDescriptor(usbDevice, (byte)0x20, (byte)0x00, (short)0x00, buf); } catch (UsbException e) { e.printStackTrace(); } One descriptor I am trying to get is a PHDC Class Function Descriptor: bLength = 0x04 bDescriptorType = 0x20 bPHDCDataCode = 0x02 bmCapability = 0x00 I can see that the descriptors are there using lsusb: r...@localhost:/opt/jvm/esf> lsusb -v -s 2:2 Bus 002 Device 002: ID 1050:0030 Yubico.com Device Descriptor: ... ... Configuration Descriptor: ... ... Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 15 bInterfaceSubClass 0 bInterfaceProtocol 0 iInterface 0 ** UNRECOGNIZED: 04 20 02 00 ** UNRECOGNIZED: 0a 30 00 03 07 10 0f 10 48 10 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0008 1x 8 bytes bInterval 10 ** UNRECOGNIZED: 04 21 01 08 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x02 EP 2 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0008 1x 8 bytes bInterval 10 ** UNRECOGNIZED: 04 21 01 08 Any thoughts? Regards, Chad Kienle |
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