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Driver Installed but no Sound (DAC+ DSP)

Mohammad Ghassemi

August 27, 2019 07:47

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Hi,

I have installed the DAC+ DSP hat on my RPi 4 and followed the instructions on https://www.hifiberry.com/build/documentation/configuring-linux-3-18-x/ to install the driver (#dtparam=audio=on, dtoverlay=hifiberry-dac, dtparam=i2s=on in config.txt and pcm.!default {type hw card 0}, ctl.!default {type hw card 0}  in asound.conf).
Unfortunately, the DAC does not work. Although aplay -l shows only the hifiberry, mplayer does not play any sound for flac and mp3. Also playing wav files leads to a periodic popping sound. Finally alsamixer says "This sound device does not have any controls." How can I address this problem?

Thanks,
Mohammad

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11 comments

• 0
  
  HiFiBerry team August 27, 2019 07:49

  The message from alsamixer is completely correct.
  Do you have any other hardware connected to the Pi? What distribution are you using? Did you already install dsptoolkit?

   

  Best regards,
  Daniel

• 0
  
  Mohammad Ghassemi August 27, 2019 08:10

  I am using raspbian buster. I enabled the i2c and spi in config.txt and tried to install the dsptoolkit using the instruction on https://github.com/hifiberry/hifiberry-dsp. sudo pip3 install --upgrade hifiberrydsp works but the script ends with an error about preserving the ownership of the config.txt. This did not solve my problem.

• 0
  
  HiFiBerry team August 27, 2019 08:12

  The error at the end if normal as the FAT filesystem does not support permissions.
  Do you have any additional software installed? Any additional stuff in config.txt?

  Best regards,
  Daniel

• 0
  
  HiFiBerry team August 27, 2019 08:13

  How is you amplifier connected? To the RCA outputs?

• 0
  
  Mohammad Ghassemi August 27, 2019 08:22

  I forgot to mention that there is nothing else connected to the RPi.
  I have installed home-assistant which is not running and samba.
  I have connected an active speaker to RCA outputs.
  these are all the noncomments in config.txt.

  dtparam=i2c_arm=on
  dtparam=i2s=on
  dtoverlay=hifiberry-dac
  [pi4]
  dtoverlay=vc4-fkms-v3d
  max_framebuffers=2
  [all]
  start_x=0
  dtparam=spi=on

• 1
  
  HiFiBerry team August 27, 2019 09:19

  Ok, try installing a fresh DSP profile

  dsptoolkit install-profile https://raw.githubusercontent.com/hifiberry/hifiberry-dsp/master/sample_files/xml/dspdac-noautomute.xml
  sudo apt-get install -y sox
  play -n synth sine 100

   

• 0
  
  Mohammad Ghassemi August 28, 2019 03:34

  Thanks a lot, installing a DSP profile solved my problem.

• 0
  
  HiFiBerry team August 28, 2019 10:44

  Interesting. This should have been installed already. Is the selfboot jumper set?

• 0
  
  Mohammad Ghassemi August 28, 2019 19:00

  If you are asking about the jumper just behind the TosLink input, yes it is set.
  Overall besides the datasheet on your website, I could not find much documentation on the board.
  By looking at the board and reading forum posts it seems that the clock is handled by the DSP, there are three separate voltage regulators for analog, digital, and PLL circuits and there is no preamp on the board.
  On the other hand, I am interested to know what d2 diode shows.

• 0
  
  HiFiBerry team August 29, 2019 05:59

  Hi,

  yes, the clock is handled directly by the DSP. There is no preamp on the board as the DAC itself already has a line-driver included that provides full 2Vrms voltage swing on 500Ohm output impedance. No pre-amp is needed for this.

  The diode D2 is connected to the DSP. It has no fixed functionality, but can be programmed for whatever is needed. In many of our DSP profiles we use it to show if the output is muted, but that's not fixed.

  Best regards,
  Daniel

• 0
  
  Mohammad Ghassemi September 01, 2019 00:20

  Thanks, I also tested the automute version and it worked for me.

  Best,
  Mohammad