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# Host: HID Controller
A USB host example that reads a USB game controller / gamepad (a HID device) and prints its inputs over the debug UART.
## What it does
- Enumerates HID devices (`CFG_TUH_HID`) and, on mount, prints the device's VID/PID.
- Decodes reports from explicitly supported controllers — Sony DualShock 4 and a few compatible PS4 pads (Hori FC4, Hori PS4 Mini, ASW GG xrd) — printing the joystick axes (x, y, z, rz), D-pad direction, and pressed buttons (Square/Cross/Circle/Triangle, L1/R1/L2/R2, Share/Option/L3/R3, PS, touchpad click). Output is only printed when the report changes meaningfully.
- Sends a periodic rumble output report back to the DualShock 4, with the motor intensities driven by the L2/R2 analog triggers.
- Blinks the board LED once per second.
Note: events are only shown for the explicitly supported controllers above; other HID devices enumerate but their reports are not decoded.
## Requirements
The board must support USB host mode (provide VBUS to the connected device); some boards need an external USB-A port / host adapter.
## Configuration
Notable `tusb_config.h` settings:
```c
#define CFG_TUH_ENABLED 1
#define CFG_TUH_HUB 0
#define CFG_TUH_DEVICE_MAX (3*CFG_TUH_HUB + 1)
#define CFG_TUH_HID (3*CFG_TUH_DEVICE_MAX)
#define CFG_TUH_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
```
## How to use
Plug a supported USB game controller (e.g. a Sony DualShock 4) into the board's USB host port. Move the sticks and press buttons — the changes are printed on the debug UART, and squeezing the L2/R2 triggers makes the controller rumble.
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