你好,
We are working on ERAGON410 board based product and linux Linaro-18 platfrom. We are using DA7212 in slave mode and set MCLK to 9.6 MHz.
#1If we apply below commands which will play directly from AUX, We can hear the noise in the HP if the volume level is more then 55-60%. Here we are not playing anything at AUX side.
amixer -q cset name='Aux Switch' on
amixer -q cset name='Mixin Left Aux Left Switch' on
amixer -q cset name='Mixin Right Aux Right Switch' on
amixer -q cset name='ADC Switch' on
amixer -q cset name='Mixout Right Mixin Right Switch' on
amixer -q cset name='Mixout Left Mixin Left Switch' on
amixer -q cset name='Headphone Volume' 70%
amixer -q cset name='Headphone Switch' on
amixer -q cset name='Mixout Left DAC Left Switch' on
amixer -q cset name='Mixout Right DAC Right Switch' on
#2If we play from the DAI after applying below configurations, we do not hear the noise in the HP,
amixer -q cset name='Aux Switch' on
amixer -q cset name='Mixin Left Aux Left Switch' on
amixer -q cset name='Mixin Right Aux Right Switch' on
amixer -q cset name='ADC Switch' on
amixer -q cset name='Mixout Right Mixin Right Switch' off
amixer -q cset name='Mixout Left Mixin Left Switch' off
amixer -q cset name='Headphone Volume' 71%
amixer -q cset name='Headphone Switch' on
amixer -q cset name='Mixout Left DAC Left Switch' on
amixer -q cset name='Mixout Right DAC Right Switch' on
amixer -q cset name='DAC Left Source MUX' 'DAI Input Left'
amixer -q cset name='DAC Right Source MUX' 'DAI Input Right'
Now, here if we add below configurations which connect AUX output to Mixout Left/Right, then we can hear the noise as per scenario #1.
amixer -q cset name='Mixout Right Mixin Right Switch' on
amixer -q cset name='Mixout Left Mixin Left Switch' on
Therefore, it seems like the issue we are getting is from the AUX side.
Can you please help here further?
Regards.
Hi,
Any update?
Hello,
The configuartion for the path setup looks correct. I would be more interested in the PLL settings supporting a Master Clock of 9.6 MHz though also dependent on the Sample Rate used, if this is not setup correctly this could be source of noise.
For more support, contacting us atwav.support@diasemi.com.
Regards,