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ES9018K2M, ES9028Q2M, 9038Q2M DSD/I2S DAC HATs for Raspberry Pi
ES9018K2M, ES9028Q2M, 9038Q2M DSD/I2S DAC HATs for Raspberry Pi
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Old 17th July 2018, 11:05 PM   #591
smoothquark is offline smoothquark  United Kingdom
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Join Date: Oct 2010
Thanks Greg. I was hoping I will be able to access the ESS volume control via ALSA but looks like it will not be possible.
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Old Yesterday, 12:30 AM   #592
DRONE7 is offline DRONE7  New Zealand
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Quote:
Originally Posted by smoothquark View Post
I was hoping I will be able to access the ESS volume control via ALSA but looks like it will not be possible.
Dietpi has a linux alsa driver for ESS. So far I haven't been able to get it to adjust volume... seems to be one of two states...on or off... and nothing in between. Ymmv.

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Old Yesterday, 03:59 PM   #593
Greg Stewart is offline Greg Stewart  United States
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ES9018K2M, ES9028Q2M, 9038Q2M DSD/I2S DAC HATs for Raspberry Pi
@smoothquark,

I suspect Ian's controller could be made to work via ALSA with an appropriate driver. BUT I don't believe that has been done. AND of course, it has to make its way through the various distros before you can use it unless you are sufficient Linux-tech-aware to compile it yourself.

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Old Yesterday, 04:14 PM   #594
TioFrancotirador is offline TioFrancotirador  Poland
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Quote:
Originally Posted by Greg Stewart View Post
@smoothquark,

I suspect Ian's controller could be made to work via ALSA with an appropriate driver. BUT I don't believe that has been done. AND of course, it has to make its way through the various distros before you can use it unless you are sufficient Linux-tech-aware to compile it yourself.

Greg in Mississippi
yep. I think all idea of separate controller was to be independent and get rid of this all various distros and ALSA drivers hassle.
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Old Yesterday, 05:18 PM   #595
matt_garman is offline matt_garman  United States
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ES9018K2M, ES9028Q2M, 9038Q2M DSD/I2S DAC HATs for Raspberry Pi
I don't think there can technically (legally) exist an open source driver for talking to the ESS chips directly. Their datasheets, which contain the I2C instructions for volume control (and filter selection,e tc) are only available under NDA. Pretty sure those details are supposed to remain private.

For their Katana DAC, Allo also created an intermediary circuit, conceptually similar to Ian's driver board. The Linux open-source drivers for the Allo device will talk to that intermediate chip, which in turn sends the real I2C commands to the ESS chip.

That said, I've seen people post ESS I2C code on their blogs. I believe this is technically a violation, though I'm not sure if ESS is actively pursuing these guys.
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