usb-device-hid: Fix boot protocol config in descriptor, default protocol mode, and protocol mode recover.#1036
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dpgeorge merged 2 commits intomicropython:masterfrom Dec 2, 2025
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This looks like a good change, thank you.
Subclass in HID interface descriptor is a flag of boot protocol support. Set it according to the interface protocol settings. HID devices should come up in non-boot mode according to Device Class Definition for Human Interface Devices (HID) v1.11 Appendix F.5. Set the initial state of interface protocol to report protocol. Signed-off-by: Hyx <hyx0329@outlook.com>
So HID device will exit boot protocol mode when entering normal OS. Signed-off-by: Hyx <hyx0329@outlook.com>
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Set the subclass value of the HID interface descriptor according to the supported interface protocol specified. Therefore BIOS will enumerate the keyboard.
The default interface protocol is set to report protocol according to the specification.
Since BIOS doesn't depend on the HID report descriptor, reset the device to report protocol when the report descriptor is read.
This is tested with a laptop and a RP2040 board with mpy 1.25.0 official release.
I use this to implement a NKRO keyboard with boot protocol support.
My understanding of 2 protocols: