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@xxxxxxxxx> wrote: > > > root@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. _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
