Finding HID descriptors for Arduino Micro

I am looking for code embedded in the source code to alter some of the fields of the HID device descriptor and HID report descriptor for Arduino micro. USBCore.h doesn't seem to define either descriptor. It has the other descriptor typedefs though. So are these two hard coded somewhere in a core.a or can I still find and change them? Thank you!

Not 100% sure but what you are looking for might be in HID.cpp

Romonaga: Not 100% sure but what you are looking for might be in HID.cpp

Thanks. I glanced at HID.cpp and moved on to other USB code. Just moved back to HID

#define D_HIDREPORT(length) { 9, 0x21, 0x01, 0x01, 0, 1, 0x22, lowByte(length), highByte(length) }

This seems to be HID report related but this is not long enough. What I extracted from micro, the complete HID report descriptor, 47 bytes in length:

05 01 09 06 a1 01 85 02 05 07 19 e0 29 e7 15 00 25 01 75 01 95 08 81 02 95 01 75 08 81 03 95 06 75 08 15 00 25 65 05 07 19 00 29 65 81 00 c0 

  INPUT(2)[INPUT]
    Field(0)
      Application(GenericDesktop.Keyboard)
      Usage(8)
        Keyboard.00e0
        Keyboard.00e1
        Keyboard.00e2
        Keyboard.00e3
        Keyboard.00e4
        Keyboard.00e5
        Keyboard.00e6
        Keyboard.00e7
      Logical Minimum(0)
      Logical Maximum(1)
      Report Size(1)
      Report Count(8)
      Report Offset(0)
      Flags( Variable Absolute )
    Field(1)
      Application(GenericDesktop.Keyboard)
      Usage(102)
        Keyboard.0000
        Keyboard.0001
        Keyboard.0002
        Keyboard.0003
        Keyboard.0004
        Keyboard.0005
        Keyboard.0006
        Keyboard.0007
        Keyboard.0008
        Keyboard.0009
        Keyboard.000a
        Keyboard.000b
        Keyboard.000c
        Keyboard.000d
        Keyboard.000e
        Keyboard.000f
        Keyboard.0010
        Keyboard.0011
        Keyboard.0012
        Keyboard.0013
        Keyboard.0014
        Keyboard.0015
        Keyboard.0016
        Keyboard.0017
        Keyboard.0018
        Keyboard.0019
        Keyboard.001a
        Keyboard.001b
        Keyboard.001c
        Keyboard.001d
        Keyboard.001e
        Keyboard.001f
        Keyboard.0020
        Keyboard.0021
        Keyboard.0022
        Keyboard.0023
        Keyboard.0024
        Keyboard.0025
        Keyboard.0026
        Keyboard.0027
        Keyboard.0028
        Keyboard.0029
        Keyboard.002a
        Keyboard.002b
        Keyboard.002c
        Keyboard.002d
        Keyboard.002e
        Keyboard.002f
        Keyboard.0030
        Keyboard.0031
        Keyboard.0032
        Keyboard.0033
        Keyboard.0034
        Keyboard.0035
        Keyboard.0036
        Keyboard.0037
        Keyboard.0038
        Keyboard.0039
        Keyboard.003a
        Keyboard.003b
        Keyboard.003c
        Keyboard.003d
        Keyboard.003e
        Keyboard.003f
        Keyboard.0040
        Keyboard.0041
        Keyboard.0042
        Keyboard.0043
        Keyboard.0044
        Keyboard.0045
        Keyboard.0046
        Keyboard.0047
        Keyboard.0048
        Keyboard.0049
        Keyboard.004a
        Keyboard.004b
        Keyboard.004c
        Keyboard.004d
        Keyboard.004e
        Keyboard.004f
        Keyboard.0050
        Keyboard.0051
        Keyboard.0052
        Keyboard.0053
        Keyboard.0054
        Keyboard.0055
        Keyboard.0056
        Keyboard.0057
        Keyboard.0058
        Keyboard.0059
        Keyboard.005a
        Keyboard.005b
        Keyboard.005c
        Keyboard.005d
        Keyboard.005e
        Keyboard.005f
        Keyboard.0060
        Keyboard.0061
        Keyboard.0062
        Keyboard.0063
        Keyboard.0064
        Keyboard.0065
      Logical Minimum(0)
      Logical Maximum(101)
      Report Size(8)
      Report Count(6)
      Report Offset(16)
      Flags( Array Absolute )

Keyboard.00e0 ---> Key.LeftControl
Keyboard.00e1 ---> Key.LeftShift
Keyboard.00e2 ---> Key.LeftAlt
Keyboard.00e3 ---> Key.LeftMeta
Keyboard.00e4 ---> Key.RightCtrl
Keyboard.00e5 ---> Key.RightShift
Keyboard.00e6 ---> Key.RightAlt
Keyboard.00e7 ---> Key.RightMeta
Keyboard.0000 ---> Sync.Report
Keyboard.0001 ---> Sync.Report
Keyboard.0002 ---> Sync.Report
Keyboard.0003 ---> Sync.Report
Keyboard.0004 ---> Key.A
Keyboard.0005 ---> Key.B
Keyboard.0006 ---> Key.C
Keyboard.0007 ---> Key.D
Keyboard.0008 ---> Key.E
Keyboard.0009 ---> Key.F
Keyboard.000a ---> Key.G
Keyboard.000b ---> Key.H
Keyboard.000c ---> Key.I
Keyboard.000d ---> Key.J
Keyboard.000e ---> Key.K
Keyboard.000f ---> Key.L
Keyboard.0010 ---> Key.M
Keyboard.0011 ---> Key.N
Keyboard.0012 ---> Key.O
Keyboard.0013 ---> Key.P
Keyboard.0014 ---> Key.Q
Keyboard.0015 ---> Key.R
Keyboard.0016 ---> Key.S
Keyboard.0017 ---> Key.T
Keyboard.0018 ---> Key.U
Keyboard.0019 ---> Key.V
Keyboard.001a ---> Key.W
Keyboard.001b ---> Key.X
Keyboard.001c ---> Key.Y
Keyboard.001d ---> Key.Z
Keyboard.001e ---> Key.1
Keyboard.001f ---> Key.2
Keyboard.0020 ---> Key.3
Keyboard.0021 ---> Key.4
Keyboard.0022 ---> Key.5
Keyboard.0023 ---> Key.6
Keyboard.0024 ---> Key.7
Keyboard.0025 ---> Key.8
Keyboard.0026 ---> Key.9
Keyboard.0027 ---> Key.0
Keyboard.0028 ---> Key.Enter
Keyboard.0029 ---> Key.Esc
Keyboard.002a ---> Key.Backspace
Keyboard.002b ---> Key.Tab
Keyboard.002c ---> Key.Space
Keyboard.002d ---> Key.Minus
Keyboard.002e ---> Key.Equal
Keyboard.002f ---> Key.LeftBrace
Keyboard.0030 ---> Key.RightBrace
Keyboard.0031 ---> Key.BackSlash
Keyboard.0032 ---> Key.BackSlash
Keyboard.0033 ---> Key.Semicolon
Keyboard.0034 ---> Key.Apostrophe
Keyboard.0035 ---> Key.Grave
Keyboard.0036 ---> Key.Comma
Keyboard.0037 ---> Key.Dot
Keyboard.0038 ---> Key.Slash
Keyboard.0039 ---> Key.CapsLock
Keyboard.003a ---> Key.F1
Keyboard.003b ---> Key.F2
Keyboard.003c ---> Key.F3
Keyboard.003d ---> Key.F4
Keyboard.003e ---> Key.F5
Keyboard.003f ---> Key.F6
Keyboard.0040 ---> Key.F7
Keyboard.0041 ---> Key.F8
Keyboard.0042 ---> Key.F9
Keyboard.0043 ---> Key.F10
Keyboard.0044 ---> Key.F11
Keyboard.0045 ---> Key.F12
Keyboard.0046 ---> Key.SysRq
Keyboard.0047 ---> Key.ScrollLock
Keyboard.0048 ---> Key.Pause
Keyboard.0049 ---> Key.Insert
Keyboard.004a ---> Key.Home
Keyboard.004b ---> Key.PageUp
Keyboard.004c ---> Key.Delete
Keyboard.004d ---> Key.End
Keyboard.004e ---> Key.PageDown
Keyboard.004f ---> Key.Right
Keyboard.0050 ---> Key.Left
Keyboard.0051 ---> Key.Down
Keyboard.0052 ---> Key.Up
Keyboard.0053 ---> Key.NumLock
Keyboard.0054 ---> Key.KPSlash
Keyboard.0055 ---> Key.KPAsterisk
Keyboard.0056 ---> Key.KPMinus
Keyboard.0057 ---> Key.KPPlus
Keyboard.0058 ---> Key.KPEnter
Keyboard.0059 ---> Key.KP1
Keyboard.005a ---> Key.KP2
Keyboard.005b ---> Key.KP3
Keyboard.005c ---> Key.KP4
Keyboard.005d ---> Key.KP5
Keyboard.005e ---> Key.KP6
Keyboard.005f ---> Key.KP7
Keyboard.0060 ---> Key.KP8
Keyboard.0061 ---> Key.KP9
Keyboard.0062 ---> Key.KP0
Keyboard.0063 ---> Key.KPDot
Keyboard.0064 ---> Key.102nd
Keyboard.0065 ---> Key.Compose

Look in Keyboard.cpp.

gbafamily: Look in Keyboard.cpp.

That saved me from searching the whole night! XOXO There are so many different pieces of code and I am doing my best to keep up. Some descriptions/naming aren't best either, like in HID.h they typedef HIDDescDescriptor?! It is supposed to be HID Device Descriptor, not HID Descriptor Descriptor?! Maybe it's not written in English but it's all confusing naming. I need to print these files out one day so I can stare at them on a large table or stick them to a wall. LOL

This is the right place to find the HID report descriptor. It turned out that the report descriptor sets keyboard with a report ID of 2, which follows Mouse report ID of 1. I'll see if I can safely remove this line and get it to not report ID (2) anymore.