--- a
+++ b/doc/usbinfo.txt
@@ -0,0 +1,89 @@
+Bus 002 Device 003: ID 21a1:0001  
+Device Descriptor:
+  bLength                18
+  bDescriptorType         1
+  bcdUSB               2.00
+  bDeviceClass            0 (Defined at Interface level)
+  bDeviceSubClass         0 
+  bDeviceProtocol         0 
+  bMaxPacketSize0         8
+  idVendor           0x21a1 
+  idProduct          0x0001 
+  bcdDevice            0.03
+  iManufacturer           1 
+  iProduct                2 
+  iSerial                 3 
+  bNumConfigurations      1
+  Configuration Descriptor:
+    bLength                 9
+    bDescriptorType         2
+    wTotalLength           59
+    bNumInterfaces          2
+    bConfigurationValue     1
+    iConfiguration          0 
+    bmAttributes         0x80
+      (Bus Powered)
+    MaxPower              100mA
+    Interface Descriptor:
+      bLength                 9
+      bDescriptorType         4
+      bInterfaceNumber        0
+      bAlternateSetting       0
+      bNumEndpoints           1
+      bInterfaceClass         3 Human Interface Device
+      bInterfaceSubClass      0 No Subclass
+      bInterfaceProtocol      0 None
+      iInterface              0 
+        HID Device Descriptor:
+          bLength                 9
+          bDescriptorType        33
+          bcdHID               1.11
+          bCountryCode           33 US
+          bNumDescriptors         1
+          bDescriptorType        34 Report
+          wDescriptorLength      20
+         Report Descriptors: 
+           ** UNAVAILABLE **
+      Endpoint Descriptor:
+        bLength                 7
+        bDescriptorType         5
+        bEndpointAddress     0x81  EP 1 IN
+        bmAttributes            3
+          Transfer Type            Interrupt
+          Synch Type               None
+          Usage Type               Data
+        wMaxPacketSize     0x0008  1x 8 bytes
+        bInterval               1
+    Interface Descriptor:
+      bLength                 9
+      bDescriptorType         4
+      bInterfaceNumber        1
+      bAlternateSetting       0
+      bNumEndpoints           1
+      bInterfaceClass         3 Human Interface Device
+      bInterfaceSubClass      0 No Subclass
+      bInterfaceProtocol      0 None
+      iInterface              4 
+        HID Device Descriptor:
+          bLength                 9
+          bDescriptorType        33
+          bcdHID               1.11
+          bCountryCode            0 Not supported
+          bNumDescriptors         1
+          bDescriptorType        34 Report
+          wDescriptorLength      28
+         Report Descriptors: 
+           ** UNAVAILABLE **
+      Endpoint Descriptor:
+        bLength                 7
+        bDescriptorType         5
+        bEndpointAddress     0x82  EP 2 IN
+        bmAttributes            3
+          Transfer Type            Interrupt
+          Synch Type               None
+          Usage Type               Data
+        wMaxPacketSize     0x0020  1x 32 bytes
+        bInterval               1
+can't get device qualifier: Operation not permitted
+can't get debug descriptor: Operation not permitted
+cannot read device status, Operation not permitted (1)