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third_party/tinyusb/examples/device/hid_generic_inout/README.md

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+# HID Generic In/Out
+
+A USB HID device that exchanges raw IN/OUT reports over a vendor-defined usage page, with no standard keyboard/mouse usage. It simply echoes back whatever the host sends.
+
+## What it does
+
+- Presents one HID interface built from the generic in/out report descriptor template (vendor usage page), with both an IN and an OUT endpoint.
+- Whenever the host sends data on the OUT endpoint (or via SET_REPORT), the device echoes the same bytes back to the host via `tud_hid_report`.
+- The LED blinks to indicate USB state (250 ms not mounted, 1000 ms mounted, 2500 ms suspended).
+- Because the reports carry no standard HID usage, the device is meant to be driven by a host-side tool rather than recognized as a keyboard/mouse. The example ships with `hid_test.js` (node-hid) and `hid_test.py` (Python `hid`) scripts to send and receive data.
+
+## USB Descriptors
+
+| Interface | Class driver |
+|-----------|--------------|
+| 0 | HID (generic in/out, raw vendor reports) |
+
+## Configuration
+
+Notable `tusb_config.h` settings:
+
+```c
+#define CFG_TUD_HID            1
+#define CFG_TUD_HID_EP_BUFSIZE 64
+```
+
+## Building
+
+CMake:
+
+```bash
+mkdir build && cd build
+cmake -DBOARD=raspberry_pi_pico ..
+cmake --build .
+```
+
+Make:
+
+```bash
+make BOARD=raspberry_pi_pico all
+```
+
+## Try it
+
+After flashing, run the bundled host tool — `node hid_test.js` or `python3 hid_test.py` — to send a buffer to the device and observe the same data echoed back.