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Hiwonder Carrier Board

Product Overview​

This carrier board integrates multiple peripherals. The following are instructions for using the audio section.

Installation​

  • Hardware Deployment​

Refer to other audio boards for connection. Connect using the 40-pin to 40-pin interface.

  • Software Configuration​

  1. Use srpi-config to configure the audio board.
    Go to 3 Interface Options -> I5 Audio
    Select Hiwonder Audio Driver HAT: image-audio-codec-select-hiwonder-hat-rdkx5.png

  2. Follow the prompts to execute the reboot command, or run sync && reboot to restart the board. If cat /proc/asound/cards shows the duplexaudioi2s1 sound card, the carrier board is installed successfully.

root@ubuntu:~# cat /proc/asound/cards 
 0 [duplexaudioi2s1]: simple-card - duplex-audio-i2s1
            duplex-audio-i2s1
 1 [duplexaudio    ]: simple-card - duplex-audio
            duplex-audio

  • Uninstallation​

  1. Use srpi-config to configure the audio board.
    Go to 3 Interface Options -> I5 Audio
    Select UNSET to uninstall the audio driver and related configurations.

  2. Remove the carrier board.

Usage​

Check if the sound card exists and verify the device number.

To confirm the sound card is registered (as mentioned above):

root@ubuntu:~# cat /proc/asound/cards 
 0 [duplexaudioi2s1]: simple-card - duplex-audio-i2s1
            duplex-audio-i2s1
 1 [duplexaudio    ]: simple-card - duplex-audio
            duplex-audio

To check logical devices:

root@ubuntu:~# cat /proc/asound/devices
  2: [ 0- 0]: digital audio playback
  3: [ 0- 1]: digital audio capture
  4: [ 0]   : control
  5: [ 1- 0]: digital audio playback
  6: [ 1- 0]: digital audio capture
  7: [ 1]   : control
 33:        : timer

To check actual device files in user space:

root@ubuntu:~# ls /dev/snd/
by-path  controlC0  controlC1  pcmC0D0p  pcmC0D1c  pcmC1D0c  pcmC1D0p  timer

Based on the above and the onboard Earphone audio port documentation, sound card 0 corresponds to the Hiwonder Audio Driver HAT node; the devices exist, with device numbers 0-0 and 0-1. The actual devices to operate are pcmC0D0p and pcmC0D1c.

The onboard sound card corresponds to 1, with device number 1-0, which is not used here.

Use the following command to record audio:

arecord -Dhw:0,0 -c 2 -r 48000 -f S32_LE -t wav -d 10 /userdata/record1.wav

Use the following command to play back the recorded audio:

aplay -D hw:0,0 /userdata/record1.wav

FAQ​

See the following link for more information