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2a114013d4
Speed-switched desc_device_ss (bcdUSB 0x0320, bMaxPacketSize0 = 9), SuperSpeed config arrays from the TUD_*_SS_DESCRIPTOR templates, BOS, and EP0 / bulk buffer sizing for SuperSpeed across the device examples.
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:
#define CFG_TUD_DFU_RUNTIME 1
Building
CMake:
mkdir build && cd build
cmake -DBOARD=raspberry_pi_pico ..
cmake --build .
Make:
make BOARD=raspberry_pi_pico all
Try it
List the device; it appears in Runtime mode:
dfu-util -l
Request a switch to DFU mode:
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.