custom audio card on beaglebone

custom audio card on beaglebone

[jo]

Hi everyone,

I am currently trying to get a simple audio I2S DAC board 
(https://polyvection.com/shop/plaindac/) to work on a beaglebone green 
wireless. The components is a PCM5121, a popular one that has an 
existing driver.

so far,
- I have a custom compiled kernel with the apropriate driver compiled
$ grep PCM512 .config
CONFIG_SND_SOC_PCM512x=m
CONFIG_SND_SOC_PCM512x_I2C=m


- I can boot with a custom device tree including my definition of the 
board as an "asoc-simple-card" and it get recognise without error on boot.

root at beaglebone:~# dmesg |grep sound
[   28.730678] asoc-simple-card sound: pcm512x-hifi <-> 48038000.mcasp 
mapping ok
root at beaglebone:~# lsmod |grep pcm512
snd_soc_pcm512x_i2c     2782  1
snd_soc_pcm512x        24341  1 snd_soc_pcm512x_i2c
snd_soc_core          192029  5 
snd_soc_pcm512x,snd_soc_davinci_mcasp,snd_soc_edma,snd_soc_omap,snd_soc_simple_card
snd_pcm               103172  6 
snd_soc_pcm512x,snd_soc_davinci_mcasp,snd_soc_core,snd_soc_omap,snd_pcm_dmaengine


- I can open the device with alsamixer, and can confirm the sound is on 100%

Howewer, I still can't get any sound of the device.

Does someone has experience in regards to asoc audio device and cant 
give me some thought on easy to miss things ?
I am still trying to figure out if I have omitted something on the 
device tree, or if I need to configure something more on the OS (alsa, 
pulseaudio ?)...

I have attached my device tree, if someone feel like giving a look at 
it. (my addition from the original one comes after line 73).
Also some output that may give you more info that they are giving to me:

root at beaglebone:~# aplay -v Pom\ Pom.wav
Playing WAVE 'Pom Pom.wav' : Signed 32 bit Little Endian, Rate 44100 Hz, 
Stereo
ALSA <-> PulseAudio PCM I/O Plugin
Its setup is:
   stream       : PLAYBACK
   access       : RW_INTERLEAVED
   format       : S32_LE
   subformat    : STD
   channels     : 2
   rate         : 44100
   exact rate   : 44100 (44100/1)
   msbits       : 32
   buffer_size  : 22050
   period_size  : 5512
   period_time  : 125000
   tstamp_mode  : NONE
   period_step  : 1
   avail_min    : 5512
   period_event : 0
   start_threshold  : 22050
   stop_threshold   : 22050
   silence_threshold: 0
   silence_size : 0
   boundary     : 1445068800

#nothing play and the above stay displayed -as is- until I ctrl-c


root at beaglebone:~# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: plaindac [plaindac], device 0: davinci-mcasp.0-pcm512x-hifi 
pcm512x-hifi-0 []
   Subdevices: 0/1
   Subdevice #0: subdevice #0


root at beaglebone:~# cat /proc/asound/card0/pcm0p/info
card: 0
device: 0
subdevice: 0
stream: PLAYBACK
id: davinci-mcasp.0-pcm512x-hifi pcm512x-hifi-0on
name:
subname: subdevice #0
class: 0
subclass: 0
subdevices_count: 1
subdevices_avail: 0


Regards,
Jonathan.
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custom audio card on beaglebone

[anish singh]

On Sun, Jan 22, 2017 at 1:38 PM, jo <crazyiop@gmail.com> wrote:

> Hi everyone,
>
> I am currently trying to get a simple audio I2S DAC board (
> https://polyvection.com/shop/plaindac/) to work on a beaglebone green
> wireless. The components is a PCM5121, a popular one that has an existing
> driver.
>
> so far,
> - I have a custom compiled kernel with the apropriate driver compiled
> $ grep PCM512 .config
> CONFIG_SND_SOC_PCM512x=m
> CONFIG_SND_SOC_PCM512x_I2C=m
>
>
> - I can boot with a custom device tree including my definition of the
> board as an "asoc-simple-card" and it get recognise without error on boot.
>
> root at beaglebone:~# dmesg |grep sound
> [   28.730678] asoc-simple-card sound: pcm512x-hifi <-> 48038000.mcasp
> mapping ok
> root at beaglebone:~# lsmod |grep pcm512
> snd_soc_pcm512x_i2c     2782  1
> snd_soc_pcm512x        24341  1 snd_soc_pcm512x_i2c
> snd_soc_core          192029  5 snd_soc_pcm512x,snd_soc_davinc
> i_mcasp,snd_soc_edma,snd_soc_omap,snd_soc_simple_card
> snd_pcm               103172  6 snd_soc_pcm512x,snd_soc_davinc
> i_mcasp,snd_soc_core,snd_soc_omap,snd_pcm_dmaengine
>
>
> - I can open the device with alsamixer, and can confirm the sound is on
> 100%
>
> Howewer, I still can't get any sound of the device.
>
> Does someone has experience in regards to asoc audio device and cant give
> me some thought on easy to miss things ?
> I am still trying to figure out if I have omitted something on the device
> tree, or if I need to configure something more on the OS (alsa, pulseaudio
> ?)...
>
> I have attached my device tree, if someone feel like giving a look at it.
> (my addition from the original one comes after line 73).
> Also some output that may give you more info that they are giving to me:
>
> root at beaglebone:~# aplay -v Pom\ Pom.wav
> Playing WAVE 'Pom Pom.wav' : Signed 32 bit Little Endian, Rate 44100 Hz,
> Stereo
> ALSA <-> PulseAudio PCM I/O Plugin
> Its setup is:
>   stream       : PLAYBACK
>   access       : RW_INTERLEAVED
>   format       : S32_LE
>   subformat    : STD
>   channels     : 2
>   rate         : 44100
>   exact rate   : 44100 (44100/1)
>   msbits       : 32
>   buffer_size  : 22050
>   period_size  : 5512
>   period_time  : 125000
>   tstamp_mode  : NONE
>   period_step  : 1
>   avail_min    : 5512
>   period_event : 0
>   start_threshold  : 22050
>   stop_threshold   : 22050
>   silence_threshold: 0
>   silence_size : 0
>   boundary     : 1445068800
>
> #nothing play and the above stay displayed -as is- until I ctrl-c
>

Possible that you have not turned on the mixer controls i.e.
enabling the volume?

Check sw_ptr and hw_ptr and see if those are increasing or not?

Probe the I2S lines and see if there is any data?


>
>
> root at beaglebone:~# aplay -l
> **** List of PLAYBACK Hardware Devices ****
> card 0: plaindac [plaindac], device 0: davinci-mcasp.0-pcm512x-hifi
> pcm512x-hifi-0 []
>   Subdevices: 0/1
>   Subdevice #0: subdevice #0
>
>
> root at beaglebone:~# cat /proc/asound/card0/pcm0p/info
> card: 0
> device: 0
> subdevice: 0
> stream: PLAYBACK
> id: davinci-mcasp.0-pcm512x-hifi pcm512x-hifi-0on
> name:
> subname: subdevice #0
> class: 0
> subclass: 0
> subdevices_count: 1
> subdevices_avail: 0
>
>
> Regards,
> Jonathan.
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
>
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custom audio card on beaglebone

[crazyiop at gmail.com]

Hi Anish,

thanks for giving me some thougt. 
Here is what I found:

On Sun, Jan 22, 2017 at 03:47:54PM -0800, anish singh wrote:
> On Sun, Jan 22, 2017 at 1:38 PM, jo <crazyiop@gmail.com> wrote:
> 
> > root at beaglebone:~# aplay -v Pom\ Pom.wav
> > Playing WAVE 'Pom Pom.wav' : Signed 32 bit Little Endian, Rate 44100 Hz,
> > Stereo
> > ALSA <-> PulseAudio PCM I/O Plugin
> > Its setup is:
> >   stream       : PLAYBACK
> >   access       : RW_INTERLEAVED
> >   format       : S32_LE
> >   subformat    : STD
> >   channels     : 2
> >   rate         : 44100
> >   exact rate   : 44100 (44100/1)
> >   msbits       : 32
> >   buffer_size  : 22050
> >   period_size  : 5512
> >   period_time  : 125000
> >   tstamp_mode  : NONE
> >   period_step  : 1
> >   avail_min    : 5512
> >   period_event : 0
> >   start_threshold  : 22050
> >   stop_threshold   : 22050
> >   silence_threshold: 0
> >   silence_size : 0
> >   boundary     : 1445068800
> >
> > #nothing play and the above stay displayed -as is- until I ctrl-c
> >
> 
> Possible that you have not turned on the mixer controls i.e.
> enabling the volume?
> 
> Check sw_ptr and hw_ptr and see if those are increasing or not?
> 
> Probe the I2S lines and see if there is any data?
> 
> 

So first, the above command in fact do finish after the length of the file (I
thought I took a much smaller test sample..)

The mixer control were all on and volume to the max.
I don't have a scope, but you made me realize that I'm clueless in front
of my problem without one... So I finnaly found an access to one. The measure
show that the input clock of the pll (mclk) is just non-existant. 
I now know what to look for.

I tried to find a reference to those sw_ptr and hw_ptr somewhere,
without success, what are they and where can I find/probe them ?

Thanks!!
Jonathan.

custom audio card on beaglebone

[anish singh]

On Wed, Jan 25, 2017 at 2:30 AM, <crazyiop@gmail.com> wrote:

> Hi Anish,
>
> thanks for giving me some thougt.
> Here is what I found:
>
> On Sun, Jan 22, 2017 at 03:47:54PM -0800, anish singh wrote:
> > On Sun, Jan 22, 2017 at 1:38 PM, jo <crazyiop@gmail.com> wrote:
> >
> > > root at beaglebone:~# aplay -v Pom\ Pom.wav
> > > Playing WAVE 'Pom Pom.wav' : Signed 32 bit Little Endian, Rate 44100
> Hz,
> > > Stereo
> > > ALSA <-> PulseAudio PCM I/O Plugin
> > > Its setup is:
> > >   stream       : PLAYBACK
> > >   access       : RW_INTERLEAVED
> > >   format       : S32_LE
> > >   subformat    : STD
> > >   channels     : 2
> > >   rate         : 44100
> > >   exact rate   : 44100 (44100/1)
> > >   msbits       : 32
> > >   buffer_size  : 22050
> > >   period_size  : 5512
> > >   period_time  : 125000
> > >   tstamp_mode  : NONE
> > >   period_step  : 1
> > >   avail_min    : 5512
> > >   period_event : 0
> > >   start_threshold  : 22050
> > >   stop_threshold   : 22050
> > >   silence_threshold: 0
> > >   silence_size : 0
> > >   boundary     : 1445068800
> > >
> > > #nothing play and the above stay displayed -as is- until I ctrl-c
> > >
> >
> > Possible that you have not turned on the mixer controls i.e.
> > enabling the volume?
> >
> > Check sw_ptr and hw_ptr and see if those are increasing or not?
> >
> > Probe the I2S lines and see if there is any data?
> >
> >
>
> So first, the above command in fact do finish after the length of the file
> (I
> thought I took a much smaller test sample..)
>
> The mixer control were all on and volume to the max.
> I don't have a scope, but you made me realize that I'm clueless in front
> of my problem without one... So I finnaly found an access to one. The
> measure
> show that the input clock of the pll (mclk) is just non-existant.
> I now know what to look for.
>
> I tried to find a reference to those sw_ptr and hw_ptr somewhere,
> without success, what are they and where can I find/probe them ?
>


# cat /proc/asound/card0/pcm0p/sub0/status
state: RUNNING
owner_pid   : 1440
trigger_time: 16024.849105290
tstamp      : 16175.605386326
delay       : 768
avail       : 1280
avail_max   : 2048
-----
hw_ptr      : 7236608
appl_ptr    : 7237376


>
> Thanks!!
> Jonathan.
>
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