Re: xCore200 UAC2 Demo record only silence under Linux
Posted: Fri Nov 25, 2016 11:58 am
Hi,
here the action on board and resulting print on console with the debug code added just before my patch force dsdMode to OFF:
1) Run board with USB detached
dsdMode : 0
2) Attach USB to host
dsdMode : 0
dsdMode : 0
dsdMode : 0
dsdMode : 2
3) Run arecord -D hw:0 -r 48000 ...
dsdMode : 2
(so this without patch will record empty audio)
4) Run spekaker-tests -D hw:0 -r 48000 ...
dsdMode : 0
(AudioHwConfig will be executed also if the sample rate is not changed and correctly init ADC and DAC also without patch)
5) Run arecord -D hw:0 -r 48000 ...
(AudioHwConfig was not executed because sample rate is not changed but ADC is just correctly initialized and audio will becorrectly recorded)
6) Run arecord -D hw:0 -r 96000 ...
dsdMode : 0
(Changing samplerate force execution of AudioHwConfig)
7) Detaching and attaching again USB cable result in retarting exactly from point (2)
Hope this help to understand!
Lorenzo
here the action on board and resulting print on console with the debug code added just before my patch force dsdMode to OFF:
Code: Select all
printstr("dsdMode : ");
printintln(dsdMode);
#if(DSD_CHANS_DAC == 0)
dsdMode = DSD_MODE_OFF;
#endif
1) Run board with USB detached
dsdMode : 0
2) Attach USB to host
dsdMode : 0
dsdMode : 0
dsdMode : 0
dsdMode : 2
3) Run arecord -D hw:0 -r 48000 ...
dsdMode : 2
(so this without patch will record empty audio)
4) Run spekaker-tests -D hw:0 -r 48000 ...
dsdMode : 0
(AudioHwConfig will be executed also if the sample rate is not changed and correctly init ADC and DAC also without patch)
5) Run arecord -D hw:0 -r 48000 ...
(AudioHwConfig was not executed because sample rate is not changed but ADC is just correctly initialized and audio will becorrectly recorded)
6) Run arecord -D hw:0 -r 96000 ...
dsdMode : 0
(Changing samplerate force execution of AudioHwConfig)
7) Detaching and attaching again USB cable result in retarting exactly from point (2)
Hope this help to understand!
Lorenzo