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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.
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