32bit Usage items are not supported by get_usage of libusb backend #454

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opened 2022-09-11 08:23:38 -05:00 by JoergAtGithub · 2 comments

JoergAtGithub commented

2022-09-11 08:23:38 -05:00

(Migrated from github.com)

The USB standard allows it to specify a usage in two ways:

Fully qualified as one single 4 byte report descriptor Usage item
Seperated in an 1 or 2 byte Usage-Page item, followed by an 1 or 2 byte Usage item
The get_usage function of the libusb backend supports only the second.

From USB HID spec 1.11 page 17:

From USB HID spec 1.11 page 35:

The USB standard allows it to specify a usage in two ways: - Fully qualified as one single 4 byte report descriptor Usage item - Seperated in an 1 or 2 byte Usage-Page item, followed by an 1 or 2 byte Usage item The get_usage function of the libusb backend supports only the second. From USB HID spec 1.11 page 17: ![grafik](https://user-images.githubusercontent.com/64457745/189529023-f800f2e9-85b2-4bac-bfce-68b17604c11a.png) From USB HID spec 1.11 page 35: ![grafik](https://user-images.githubusercontent.com/64457745/189529415-61ed0bc9-b26b-4b7e-b16d-a3b63b018589.png)

mcuee commented

2023-05-10 04:32:00 -05:00

(Migrated from github.com)