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Luckfox Aura
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Audio

1. Overview​

The Luckfox Aura development board integrates a complete audio processing subsystem (Audio Codec and SAI interface), supporting analog microphone input and headphone audio output. External analog audio signals can be captured through the internal ADC and transmitted to the CPU. At the same time, the CPU can output local PCM (Pulse Code Modulation) digital audio data through the internal DAC, converting it into analog signals for playback.

2. Audio Configuration​

  1. Check sound card devices

    aplay -l

  2. Sound device nodes

    root@aura:/home/aura# ls /dev/snd/
    by-path  controlC0  pcmC0D0c  pcmC0D0p  timer
    • controlC0：Used for sound card control. C0 represents sound card 0, corresponding to the onboard audio device
    • pcmC0D0c：PCM capture device (recording), "c" stands for capture
    • pcmC0D0p：PCM playback device, "p" stands for playback
    root@aura:/home/aura# ls -l /dev/snd/by-path/
    total 0
    lrwxrwxrwx 1 root root 12 Sep  3  2025 platform-acodec-sound -> ../controlC0

3. Test​

  1. When connecting the camera and display for testing, please make sure to stop RKIPC from occupying the audio resources beforehand to avoid conflicts.

    sudo su
    RkLunch-stop-RKIPC_RV1126B.sh

  2. Recording test

    arecord -D main_mic0 -f cd -c 2 -r 48000 test0.wav  # Headset microphone
    arecord -D main_mic1 -f cd -c 2 -r 48000 test1.wav  # Onboard microphone

  3. Playback test

    aplay -Dhw:0,0 -t wav /userdata/test.wav
    aplay -D hw:1,0 -r 44100 test.wav

4. External USB to Audio​

Here we use a Waveshare USB to Audio module as an example.

  1. Check sound card devices

    aplay -l
    • Example output:

  2. Recording test

    # Record 5 seconds (stereo, 48kHz)
    arecord -D hw:1,0 -f cd -r 48000 -d 5 usb_device_test.wav

    # Continuous recording (press Ctrl+C to stop)
    arecord -D hw:1,0 -f cd -c 2 -r 48000 usb_mic_test.wav
    • -D hw:1,0: Specify sound card device (card 1, device 0)
    • -f cd: Audio format (16-bit, 44.1kHz, stereo)
    • -r 48000: Sample rate (48kHz)
    • -c 2: Stereo channels
    • -d 5: Duration (seconds)

  3. Playback test

    # Format: hw:<card>,<device>
    aplay -D hw:1,0 usb_mic_test.wav