Get USB HID report descriptors via mac/win software #USB @todbot

One of the aspects of the USB Human Interface Device (HID) protocol is that isn’t clear is that HID devices transmit and receive data with “reports”, fixed-size data packets. What reports a device responds to is described by the HID Report Descriptor it hands to the operating system (OS). The OS then only permits those reports to be sent and received. This descriptor is different from the USB Config & Device Descriptors. Those two are easily discoverable using standard system tools. For whatever reason, getting HID Report Descriptors is much harder.

Todbot blogs about Windows and Mac tools to get HID report descriptors:

I’ve created two tools: win-hid-dump and mac-hid-dump from code snippets around the Net. They are akin to simplified versions of usbhid-dump for Linux. They print the HID Report Descriptors of the HID devices currently connected and the output can be parsed by things like https://eleccelerator.com/usbdescreqparser/

The tool repos with pre-compiled releases:

I’ve found many of the issues I have in supporting node-hid is getting people to understand that you need to know the type and sizes of the reports you want.

See this post for more information.


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