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# DFU Runtime
A minimal device that exposes a DFU runtime interface, advertising to the host that it can be switched into DFU (bootloader) mode.
## What it does
- Exposes a single DFU runtime interface alongside normal operation.
- On a DFU_DETACH request, it does not actually reboot into a bootloader; instead it speeds up the LED blink as an indicator (this example is intentionally minimal).
- Provides a BOS / Microsoft OS 2.0 descriptor so Windows binds the WinUSB driver.
- LED blink rate indicates bus state (not mounted / mounted / suspended / DFU detach).
## USB Descriptors
| Interface | Class driver |
|-----------|--------------|
| 0 | DFU Runtime |
## Configuration
Notable `tusb_config.h` settings:
```c
#define CFG_TUD_DFU_RUNTIME 1
```
## Building
CMake:
```bash
mkdir build && cd build
cmake -DBOARD=raspberry_pi_pico ..
cmake --build .
```
Make:
```bash
make BOARD=raspberry_pi_pico all
```
## Try it
List the device; it appears in Runtime mode:
```bash
dfu-util -l
```
Request a switch to DFU mode:
```bash
dfu-util -e
```
This sends a DETACH request. Since the example is minimal it does not enter a real bootloader; it instead changes the LED to a fast blink as confirmation.
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