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no sound on AMP after image upgrade

Olivier

November 16, 2015 20:56

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Hi all,

I'm building a squeezebox compatible powered-speaker with the hifiberry amp and a pitft 2.8" touchscreen.

Everything is working on the original raspbian wheezy distribution using the custom kernel provided by Adafruit that has the driver for the pitft touchscreen.

To reduce the boottime I've switched to a new image based on raspbian Lenny with kernel 4.1.6 (the use of systemd helped me to reduce the boot time from 40s to 18s!). BUT: although the hifiberry amp is detected succesfully, I get no sound at all.Again I used the image provided byAdafruit that has the patches applied for the pitft touchscreen.

It is detected correctly:

$ dmesg|grep amp
[ 8.228998] snd-hifiberry-amp sound: ASoC: CPU DAI (null) not registered
[ 8.229039] snd-hifiberry-amp sound: snd_soc_register_card() failed: -517
[ 8.284915] snd-hifiberry-amp sound: ASoC: CODEC DAI tas5713-hifi not registered
[ 8.284959] snd-hifiberry-amp sound: snd_soc_register_card() failed: -517
[ 12.158943] snd-hifiberry-amp sound: ASoC: CODEC DAI tas5713-hifi not registered
[ 12.158988] snd-hifiberry-amp sound: snd_soc_register_card() failed: -517
[ 14.040797] snd-hifiberry-amp sound: tas5713-hifi <-> 20203000.i2s mapping ok

The mixer settings are correct:

$ amixer
Simple mixer control 'Master',0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 248
Mono: 242 [98%]
Simple mixer control 'Channels',0
Capabilities: volume
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 248
Front Left: 239 [96%]
Front Right: 239 [96%]

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberry_amp], device 0: HifiBerry AMP HiFi tas5713-hifi-0 []
Subdevices: 0/1
Subdevice #0: subdevice #0

 

But I hear nothing.... Since I only changed the SD card, it is probably not a hardware issue. How can I fix this? I'm currently investigation how to cross compile a kernel myself, but since that will take some time I decided to ask for help on this forum too.

Thanks,

   Olivier

 

 

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4 comments

• 0
  
  Olivier November 16, 2015 22:27

  Cross compiling was easier than expected.

  $ uname -a
  Linux raspberrypi 4.1.13+ #1 PREEMPT Mon Nov 16 22:53:17 CET 2015 armv6l GNU/Linux

  but the issue remains: everything looks good on the software side, but no sound is produced.

  $ aplay piano.wav
  Playing WAVE 'piano.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo

  (same problem with squeezelite, which I actually use for my project - on the software side it plays fine but there is no sound)

  any thoughts what I could test or change?

  Olivier

• 0
  
  HiFiBerry team November 17, 2015 09:51

  Hi Oliver,

  the standard Raspberry Pi kernel should work without problems. However as Adafruit is heavily patching the kernel and did not integrate their patches into the standard kernel, we can't say what might be the problem here. This will need some deep digging into the kernel.

  Best regards
  Daniel

• 0
  
  Olivier November 17, 2015 10:26

  I will look into the patches and see if they could be related (there are 5 files patched for the touchscreen).

  I will also compile a vanilla kernel and see if that fixes the problem.

• 0
  
  Olivier November 17, 2015 14:49

  The adafruit tutorial adds this to /boot/config.txt

  device_tree=bcm2708-rpi-b-plus.dtb

  if this entry is present, the hifiberry amp will be detected correctly but will not play. If I remove this line everything works (including the display). So problem solved for now.  But what causes this problem? What does adding this device do that causes the hifiberry amp to stop functioning?