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The board uses tlv320aic3104 codec connected through McASP3 [AXR0 for playback, AXR1 for Capture] for audio. The board features two 3.5mm jack for Line Out and Line In.
Kernel config
Device Drivers --->
Sound card support --->
Advanced Linux Sound Architecture --->
ALSA for SoC audio support --->
<*> SoC Audio for the Texas Instruments OMAP chips
<*> SoC Audio for Texas Instruments chips using eDMA
<*> Multichannel Audio Serial Port (McASP) support
CODEC drivers --->
<*> Texas Instruments TLV320AIC3x CODECs
<*> ASoC Simple sound card support
User space
The hardware defaults are correct for audio playback, the routing is OK and the volume is ‘adequate’ but in case the volume is not correct:
amixer -c BeagleBoardX15 sset 'Left Line Mixer DACL1' on # Line out Left enable
amixer -c BeagleBoardX15 sset 'Right Line Mixer DACR1' on # Line out Right enable
amixer -c BeagleBoardX15 sset 'Line DAC' 90 # Adjust Line out volume
Record (line in):
amixer -c BeagleBoardX15 sset 'Left PGA Mixer Mic2L' on # Line in Left enable (MIC2/LINE2)
amixer -c BeagleBoardX15 sset 'Right PGA Mixer Mic2R' on # Line in Right enable (MIC2/LINE2)
amixer -c BeagleBoardX15 sset 'PGA' 40 # Adjust Capture volume
