Qmk_firmware: F12 - 24 Keys not working on Massdrop CTRL

[M1K8]

When assigning any keycode between F13-F24, nothing happens when they key is pressed. This happens with both the online configurator when manually building the firmware. register_code() and unregister_code() are also non-functional with these keycodes.

[drashna]

I think this may actually be an OS issue, and not keyboard/QMK related.

Are you using something to keep track of the outputs and seeing if the OS is receiving anything, at all?

[M1K8]

Yep, and the OS isn't receiving anything. Strangely enough if I use another qmk keyboard, the additional f keys work fine. This issue also persists across multiples machines

[drashna]

Are the boards that are having this issue using VUSB, as well?
Eg, do you know what controllers they're using?

[M1K8]

The keyboards where the f keys work fine are using a AT90USB646 and a 32u4, whilst the problematic keyboard is using a ATSAMD51J18A.

[fauxpark]

This is probably because the ATSAM HID report descriptor only declares usages up to 0x65, and the F13-F24 keys are 0x68 through 0x73. If you change the Usage Maximum and Logical Maximum to 0xFF it should work.

[M1K8]

That fixed it, thanks!

[patrickmt]

@M1K8 just to be clear, did you increase both Usage Maximum and Logical Maximum to 0xFF as suggested by @fauxpark for the correct functionality?