Example Programs

CMake builds multiple example_* executables to verify SDK and device capabilities.

Wakeup

./build/bin/example_wakeup

Listens for GPIO 33/GPIO 32 falling edge. Typical hardware connection: button connects GPIO to GND with internal pull-up.

Audio Capture

./build/bin/example_audio_capture [device_name]

Captures audio and prints frame information. Optionally pass in ALSA device name.

Audio Playback

./build/bin/example_audio_play [device_name]

Plays back a PCM audio file (audio_capture_debug.pcm) through the specified ALSA device. The PCM file must exist in the current directory or the path where the binary is run.

Camera Capture

./build/bin/example_camera_capture
./build/bin/example_camera_capture --output /mnt/tmp/frame.raw
./build/bin/example_camera_capture --edid /mnt/tmp/hdmi_1080p30_cta.hex

Common parameters:

example_camera_capture [device_path] [width] [height] [pixfmt] [skip_frames] [options]

Supports options like --device, --subdev, --edid, --force-trigger, --capture-retries, --output, etc. See --help for details.

Default one-shot flow:

• First queries current DV timings;
• Pushes built-in 1080p60-only CTA EDID if necessary;
• Waits for /dev/v4l-subdev2 HDMI sync;
• Discards transitional frames after stream-on;
• Captures from /dev/video0 via V4L2 MMAP;
• Saves viewable /mnt/tmp/frame.ppm by default.

If frame_service is running, stop it first, otherwise /dev/video0 will be busy.

USB HID

sudo ./build/bin/example_usb_hid setup composite
sudo ./build/bin/example_usb_hid keyboard tap ENTER
sudo ./build/bin/example_usb_hid keyboard text "hello from pico"
sudo ./build/bin/example_usb_hid touch click 16000 16000
sudo ./build/bin/example_usb_hid cleanup

For more information, see USB HID and Device Control.

Other Tools

Program	Description
hello	Basic C program verification
trigger	GPIO / trigger-related utility
audio_stream	Audio stream example tool
config_web	Configuration web service
frame_service_cli	Frame Service debugging CLI
audio_service_cli	Audio Service debugging CLI