Does mouse wheel work for you in USB host mode ?

[shreekumar3d]

I am using tinyusb on the RP2040 in host mode with mice. I find that only with logitech mouse the mouse wheel value is correct (non-zero, positive and negative directions). Mice of all other brands I have tested (Dell, and many other) all return 0.

Positing this here to check experience of others in the community... Does the mouse wheel work for you ?

With a mouse I am testing now, I see that when I move the wheel, events are being generated. I will be investigating this a bit more in detail in a few days, but meanwhile, any input will be most appreciated.

I have enabled logs (LOG=3). I see that when mouse wheel is activated, the data bytes are all 0 (same prints repeat every time I move the mouse)

Completed transfer of 3 bytes on ep 1 in
on EP 81 with 3 bytes
HID xfer callback
Get Report callback (2, 0)
0000: 00 00 00 |...|
HID receive boot mouse report
(0 0 0)

I find that strange, as I certainly expect the values in the report to change with the movement.

[shreekumar3d]

I switched the mouse to the report protocol (not boot). Then each report was 5 bytes. Looks like the report needs to be carefully parsed - only the first 3 bytes are supposed to be a bit standard. The rest depend on the descriptor.

[hathach]

Yeah, currently host stack will set the protocol to BOOT mode since it currently lack an report parser. In the future this may change though when we have a decent parser.