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Headphone Jack

Radxa Cubie A7A features an onboard 3.5mm 4-pole headphone jack, supporting both audio input and output.

tip

For the exact location of the headphone jack, please refer to the interface description section in the Hardware Interfaces guide!

Usage Guide​

Connect a 3.5mm headphone cable to the headphone jack of the Cubie A7A and your headphones, then play audio on the Cubie A7A to test if there is sound.

If you cannot play audio, try unplugging and replugging the headphone cable or check if the audio output device is set correctly.

Check Audio Devices​

Use the aplay -l command to view audio playback devices (speakers), and use the arecord -l command to view audio recording devices (microphones).

  • View audio playback devices
radxa@device$
aplay -l

Sample terminal output: card 0: sndi2s0 is the onboard AC101 audio codec, usually used for input (microphone) and output (audio playback) of the 3.5mm headphone jack.

**** List of PLAYBACK Hardware Devices ****
card 0: sndi2s0 [sndi2s0], device 0: sunxi-snd-plat-i2s-ac101-codec sunxi-ac101.15-001a-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: sndhdmi [sndhdmi], device 0: sunxi-snd-plat-i2s-sunxi-snd-codec-hdmi soc@3000000:hdmi_codec- []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
  • View audio recording devices
radxa@device$
arecord -l

Sample output: card 0: sndi2s0 is the onboard AC101 audio codec, usually used for input (microphone) and output (audio playback) of the 3.5mm headphone jack.

radxa@device$
**** List of CAPTURE Hardware Devices ****
card 0: sndi2s0 [sndi2s0], device 0: sunxi-snd-plat-i2s-ac101-codec sunxi-ac101.15-001a-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: sndhdmi [sndhdmi], device 0: sunxi-snd-plat-i2s-sunxi-snd-codec-hdmi soc@3000000:hdmi_codec- []
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Record Audio​

This function requires the headset to support a microphone. Use the arecord command to record audio.

radxa@device$
sudo arecord -Dhw:0,0 -d 20 -f cd -r 44100 -c 2 -t wav  /tmp/tmp.wav
  • Dhw:0,0: Use card 0: sndi2s0 and device 0
  • d 20: Record for 20 seconds
  • f cd: Use CD audio format
  • r 44100: Use 44.1kHz sampling rate
  • c 2: Use stereo
  • t wav: Use WAV format
  • /tmp/tmp.wav: Output file path

Play Audio​

Use the aplay command to play audio.

radxa@device$
sudo aplay -Dhw:0,0 /tmp/tmp.wav
  • Dhw:0,0: Use card 0: sndi2s0 and device 0
  • /tmp/tmp.wav: Input file path

Port Specifications​

Technical Reference

For complete technical specifications and pin definitions, please refer to the Hardware Design: Schematic document in the download section.