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This is the setup for the DAC:

image-20241110-182828.png

https://wiki.52pi.com/index.php?title=EP-0218

Modify /boot/firmware/config.txt 

dtoverlay=hifiberry-dacplus-std

View the audio devices configured:

aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: vc4hdmi0 [vc4-hdmi-0], device 0: MAI PCM i2s-hifi-0 [MAI PCM i2s-hifi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: vc4hdmi1 [vc4-hdmi-1], device 0: MAI PCM i2s-hifi-0 [MAI PCM i2s-hifi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 2: sndrpihifiberry [snd_rpi_hifiberry_dacplus], device 0: HiFiBerry DAC+ HiFi pcm512x-hifi-0 [HiFiBerry DAC+ HiFi pcm512x-hifi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

To use the HiFiBerry DAC+ as the audio output device (card 2, as shown above), set it as the default card by creating or editing the /etc/asound.conf file with the following configuration:

defaults.pcm.card 2
default

To test the configuration, (even though an amp speakers are not connected) by generating a simple audio tone and sending it to the HiFiBerry DAC+ to confirm that it's working correctly:

  1. Install sox Utility

    sox is a utility that can be used to generate test tones. 

    sudo apt-get install sox

  2. Generate a Test Tone

    Use sox to generate a sine wave of 440 Hz (which is the A note commonly used for tuning instruments):

    play -n synth 5 sine 440

    This command will generate a 440 Hz sine wave tone for 5 seconds. By default, it will play through the default audio device, which should be the HiFiBerry DAC+.

  3. Specify Audio Device Using aplay

    To be more specific. use aplay directly. :

    • Create a WAV File:

      sox -n -r 44100 -c 2 test.wav synth 3 sine 440

      This will create a file called test.wav with a 3-second 440 Hz sine wave.

    • Play the File Using HiFiBerry:

      aplay -D hw:2,0 test.wav

Playing WAVE 'test.wav' : Signed 32 bit Little Endian, Rate 44100 Hz, Stereo

      Here, hw:2,0 refers to the hardware card 2, device 0 (the HiFiBerry DAC+).

If there are no errors in these commands, it confirms that the setup is working correctly at the software level.

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