custom audio card on beaglebone

[anish singh]

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