RE: HID over GATT - 2 byte consumer control

ovrebekk — Mon, 16 Aug 2021 14:08:22 GMT

When I use the HID Descriptor Tool to replicate your descriptor I notice that Logical Maximum 0xFFFF is decoded like this:

0x27, 0xFF, 0xFF, 0x00, 0x00, // LOGICAL_MAXIMUM (65535)

Essentially any value larger than 0x7FFF will be stored in 4 bytes rather than 2.

I expect the same goes for USAGE_MAXIMUM, but the tool doesn't let me specify this manually. You could try to define that like this:

0x2B, 0xFF, 0xFF, 0x00, 0x00,

Best regards
Torbjørn