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Updated HID lights (markdown)

sp2xdev
2025-04-14 16:33:39 -07:00
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HID-lights.md
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@@ -8,12 +8,16 @@ The [HID usage spec](https://www.usb.org/sites/default/files/hut1_6.pdf) is main
For lights, the `LED Page (0x08)` is the most commonly used, but you are not limited to those.
It also helps to understand how [Windows HID API](https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/hidpi/ns-hidpi-_hidp_caps) works, which is what spice uses. Both `OutputButtonCaps` and `OutputValueCaps` are used. Button caps are on/off values, and value caps are range values (variable brightness).
## Dumping USB capabilities and testing
Launch `spice.exe -cfg -sysdump all` to show a dump of HID devices detected by spice.
To test, go to Lights tab, and open the drop down. Your device should appear there, and you should be able to see the list of output capabilities of your device. Press `Turn On` to have spice send "on" signal to your device over the Windows HID stack.
Spice does support variable brightness, as long as the output capability you are exposing also exposes a range, not a
## Sample code
[Arduino-HID-Lighting](https://github.com/mon/Arduino-HID-Lighting) - read this first.