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Is it possible to use an SBC as a standalone DAC?
Is it possible to use an SBC as a standalone DAC?
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Old 14th May 2019, 10:28 PM   #31
nsummy is offline nsummy  United States
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Quote:
Originally Posted by phofman View Post
Exactly with that commit the samsung code was added by

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> - a guy from Samsung.

I do not see any sign of replacing it when it was in fact added. No that is really matters :-)
You are right, not worth arguing over. But are you suggesting the uac 2.0 gadget driver doesn't work?
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Old 15th May 2019, 07:34 AM   #32
phofman is online now phofman  Czech Republic
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I did not say it would not work. But look at the source code, IMO the samplerates are still hard-coded at 48kHz and 64kHz.
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Old 16th May 2019, 04:48 AM   #33
nsummy is offline nsummy  United States
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I think I am just going to have to play around with it and find out, the info out there is pretty spread out. This suggests though that the default values can be changed: USB Audio Gadget: Support multiple sampling rates [LWN.net]

On another note, I found out the Atomic Pi comes with an onboard XU208-128-TQ64. Seems like the logical board to try with this experiment.
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Old 16th May 2019, 07:36 AM   #34
phofman is online now phofman  Czech Republic
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Thanks for the patch catch. Unfortunately it has not made it into upstream History for drivers/usb/gadget/function/f_uac2.c - torvalds/linux * GitHub

But maybe it will work, I keep my fingers crossed for your project.
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Old 16th May 2019, 08:47 AM   #35
wealas is offline wealas
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Quote:
Originally Posted by nsummy View Post
On another note, I found out the Atomic Pi comes with an onboard XU208-128-TQ64. Seems like the logical board to try with this experiment.
The XMOS chip itself won't give you much, you'll need to program it to do what you need as it doesn't seem to support anything higher than 48 KHz as is: Increase I2S Audio output from 48Khz to 192Khz - Champ - Forums for Shopify
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