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+# HID Multiple Interfaces
+
+A composite USB device with two separate HID interfaces — one keyboard and one mouse — each with its own report descriptor, endpoint, and interface string.
+
+## What it does
+
+- Presents two independent HID interfaces: a keyboard (interface 0, "Keyboard Interface") and a mouse (interface 1, "Mouse Interface").
+- Polls the board button every 10 ms:
+  - Keyboard: while the button is held, sends the `A` keycode; releasing sends an empty report.
+  - Mouse: while the button is held, moves diagonally (+5, +5).
+- If the device is suspended, pressing the button issues a USB remote wakeup.
+- The LED blinks to indicate USB state (250 ms not mounted, 1000 ms mounted, 2500 ms suspended).
+
+## USB Descriptors
+
+| Interface | Class driver |
+|-----------|--------------|
+| 0 | HID (keyboard) |
+| 1 | HID (mouse) |
+
+## Configuration
+
+Notable `tusb_config.h` settings:
+
+```c
+#define CFG_TUD_HID            2 // keyboard + mouse
+#define CFG_TUD_HID_EP_BUFSIZE 8
+```
+
+## 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, the board enumerates as two distinct HID devices, a keyboard and a mouse. Press and hold the button: the host receives repeated `A` key presses and the pointer drifts toward the bottom-right.