On Wed, Jan 25, 2017 at 2:30 AM, [off-list ref] 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:

quoted

On Sun, Jan 22, 2017 at 1:38 PM, jo [off-list ref] wrote:

quoted

root at beaglebone:~# aplay -v Pom\ Pom.wav
Playing WAVE 'Pom Pom.wav' : Signed 32 bit Little Endian, Rate 44100

Hz,

quoted

quoted

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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