Headphone Jack

The Radxa Dragon Q6A has a built-in 3.5mm four-segment headphone jack that supports audio input and output.

Hardware Connection

Plug the 3.5mm headphone jack into the headphone jack on the Radxa Dragon Q6A.

tip

You can refer to the Hardware Information tutorial to find the corresponding hardware interface location.

Audio Testing

Viewing 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).

• Viewing Audio Playback Devices

radxa@device$

aplay -l

The terminal outputs similar information:

**** List of PLAYBACK Hardware Devices ****
card 0: QCS6490RadxaDra [QCS6490-Radxa-Dragon-Q6A], device 0: MultiMedia1 Playback (*) []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: QCS6490RadxaDra [QCS6490-Radxa-Dragon-Q6A], device 1: MultiMedia2 Playback (*) []
  Subdevices: 1/1
  Subdevice #0: subdevice #0

• View audio recording devices

radxa@device$

arecord -l

Output information similar to the following:

radxa@device$

**** List of CAPTURE Hardware Devices ****
card 0: QCS6490RadxaDra [QCS6490-Radxa-Dragon-Q6A], device 2: MultiMedia3 Capture (*) []
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Recording audio

This feature requires headphones that support microphone functionality and uses the arecord command to record audio.

radxa@device$

sudo arecord -Dhw:0,2 -d 20 -f cd -r 44100 -c 2 -t wav  /tmp/tmp.wav

• Dhw:0,2: Indicates using device 2 with card 0: QCS6490RadxaDra
• d 20: Indicates recording for 20 seconds
• f cd: Indicates using CD audio format
• r 44100: Indicates using a sampling rate of 44.1kHz
• c 2: Indicates using stereo
• t wav: Indicates using WAV format
• /tmp/tmp.wav: Indicates the output file path

Note: If you are unsure of the device name, you can modify the -Dhw:0,2 parameter in the command to locate the corresponding recording device.

Play audio

Use the aplay command to play audio.

radxa@device$

sudo aplay -Dhw:0,1 /tmp/tmp.wav

• Dhw:0,1: Indicates using device 1 with card 0: QCS6490RadxaDra
• /tmp/tmp.wav: Indicates the input file path

Note: If you are unsure of the device name, you can change the -Dhw:0,1 parameter in the command to find the corresponding playback device.

Interface Pin Definitions

You can refer to the hardware schematic diagram on the Resource Summary Download page.