IMX6Q Sabreauto board: No sound listened after recording audio from microphone

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IMX6Q Sabreauto board: No sound listened after recording audio from microphone

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jasonhsu
Contributor III

Hi, all

Sorry, I'm newer to FSL board, some problem might seems easy, but i am still confused. now, we have a imx6q sabreauto reference board installed with Android 4.3. i have done such operation, but found there is no sound output:

1) open "Sound Recorder" apk

2) plug in microphone in J26-1 (mics-in), connected to CS42888 AIN3+/AIN3-

3) start to record and speak toward to microphone for a moment.

4) stop record and play the record file, but I cannot hear any sound output ( however, i can hear audio if playing the music in SD card).

Analog signale waveform can be masured input to CS42888 AIN3+/AIN3- with oscilloscope, if speak more loundly toward microphone, the waveform will be changed, it seems microphone works well.

Could somebody kindly help me? many many thx ^^

MIC.jpg

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jasonhsu
Contributor III

I have a new found that if AIN1/AIN2 connected to a audio line-in, then the record file has sound output.

So i think the recorder select ADC_SDOUT2 as microphone input. does any guy know where to select ADC_SDOUT1 or ADC_SDOUT2 as microphone input?

My sound devices as below:

2|root@sabreauto_6q:/dev/snd # ls

controlC0

controlC1

pcmC0D0c

pcmC0D0p

pcmC0D1p

pcmC1D0c

timer

there are two capture streams, how to select which streams should be used as source of sound recoreder?

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