4 ms·
There is a ton more in here than one might at first guess. I happened to scan through it a couple years back, and was shocked to find out power sources (charger
by jauntywundrkind 2y ago
There is a ton more in here than one might at first guess. I happened to scan through it a couple years back, and was shocked to find out power sources (chargers, batteries) and sinks could be reporting all kinds of power telemetry like capacity, current charge, amperage, voltages... Tons of things. There's all kinds of sensors & systems!
I'd always thought of HID as keyboard + mouse, but it's actually quite a broadscale system. It just so happens we - for the most part - never used 98% of it. (Then had to reinvent a bunch of the power reporting stuff for usb-pd.)
- SSLy 2y agoThe HID was also taken wholesale and put on top of Bluetooth, right?
- mrcsharp 2y agoYes, with adjustments to make it work with the bluetooth stack. It makes sense. No need for a different input stack implementation in the OS to handle common peripherals like Keyboards and Mice just because they are using a different communication medium. HID works well for this.
- Findecanor 2y agoI wouldn't have designed the Bluetooth mouse protocol like this though. HID uses relative movements since the last packet ... and with radio interference, Bluetooth packets get lost.
- petee 2y agoThe APC smart UPS line implements quite a few metrics and settings via HID, and were kind enough to document it (application note 178) The standard does seem to allow for some complex setups which is pretty cool.