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4b1c8d16f7
Documentation tooling:
- Add the `build-doc` skill and `tools/build_doc.py` wrapper for local
Sphinx builds (clean / -W / open).
- Enable Markdown (MyST) in conf.py and auto-collect
examples/{device,host,dual}/*/README.md into a 3-level Examples nav
(Examples > Device/Host/Dual > example), noting each page's source
location and normalizing headings to a single H1.
- Remove the stale `.claude/commands/build-doc.md`; point the AGENTS.md
Documentation section at the skill.
Example docs:
- Add a README.md for every device/host/dual example: what it does, USB
interface table, notable tusb_config.h settings, generic CMake + Make
build steps, and how to try it.
- Fold each *_freertos variant into its base README, noting the FreeRTOS
source path and any RTOS-specific behavior.
Generated docs/examples/ output is git-ignored. Builds clean with
`sphinx-build -W`.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Dual-Channel Video Capture (UVC)
A USB Video Class (UVC) device that exposes two independent video streaming functions on a single device.
What it does
- Presents two UVC camera functions, both 128x96 at 10 fps.
- Stream 0 sends YUY2 (uncompressed) color bars; stream 1 sends MJPEG color-bar frames.
- Uses bulk streaming endpoints (
CFG_TUD_VIDEO_STREAMING_BULK). - Adopts the frame interval requested by the host at stream commit, per stream.
- Blinks the board LED to indicate USB state (not mounted / mounted / suspended).
USB Descriptors
| Interface | Class driver |
|---|---|
| 0–1 | UVC video (control + streaming) — YUY2 |
| 2–3 | UVC video (control + streaming) — MJPEG |
Configuration
Notable tusb_config.h settings:
#define CFG_TUD_VIDEO 2 // 2 video control interfaces
#define CFG_TUD_VIDEO_STREAMING 2 // 2 video streaming interfaces
#define CFG_TUD_VIDEO_STREAMING_EP_BUFSIZE 256
#define CFG_TUD_VIDEO_STREAMING_BULK 1 // bulk streaming endpoints
Building
CMake:
mkdir build && cd build
cmake -DBOARD=raspberry_pi_pico ..
cmake --build .
Make:
make BOARD=raspberry_pi_pico all
Try it
Two webcam devices appear on the host. On Linux, list them with v4l2-ctl --list-devices and open each with ffplay /dev/videoN or a camera app — one shows YUY2 color bars, the other MJPEG color bars.