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dohnalik / sdr-widget-experimental-384

audio-widget fork with 384 kHz 32 bit playback capability
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Question #1

Closed imiroslavov closed 5 years ago

imiroslavov commented 5 years ago

https://github.com/dohnalik/sdr-widget-experimental-384/blob/fbcefc2f264b789eff9ff8b53cb2c0b817f28358/src/uac2_usb_specific_request.c#L124

Did You actually succeed with this?

dohnalik commented 5 years ago

Yes, its working, all that needs to be done is put 24.576 or 22.5... MHz clock into the MCU clock block instead of the default 12/11M.

On Fri, 19 Oct 2018 at 12:58, Iliya Miroslavov Iliev < notifications@github.com> wrote:

https://github.com/dohnalik/sdr-widget-experimental-384/blob/fbcefc2f264b789eff9ff8b53cb2c0b817f28358/src/uac2_usb_specific_request.c#L124

Did You actually succeed with this?

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imiroslavov commented 5 years ago

Thanks for the quick response. 24576 / 384 is 64 (both channels). Don't tell me You managed to get 32bit 384k.

dohnalik commented 5 years ago

Yes, I had it working. I even have working 768kHz 32 bit, but ot XMOS platform with DSD1024. I left AVR32 as it didn't have the power anymore. To get 384 working I had to overclock it from 66MHz (default audio-widget sys freq) to 84 MHz (atmel says all chips can do 84MHz since some revision, so its not really a overclock i guess) and I think B internal bus is running on sysclk speed instead of sysclk/2. 384/32 bit is maximum this AVR32 can do IMHO. Was a long time ago.

On Fri, 19 Oct 2018 at 13:23, Iliya Miroslavov Iliev < notifications@github.com> wrote:

Thanks for the quick response. 24576 / 384 is 64 (both channels). Don't tell me You managed to get 32bit 384k.

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/dohnalik/sdr-widget-experimental-384/issues/1#issuecomment-431331478, or mute the thread https://github.com/notifications/unsubscribe-auth/AJtNgF3UsZgbYNtdD3_BzB1s7ugLwJupks5umbY3gaJpZM4XwI1n .

dohnalik commented 5 years ago

i described the changes needed on their google forum somewhere.

On Fri, 19 Oct 2018 at 13:27, Jaroslav Dohnal dohnalik88@gmail.com wrote:

Yes, I had it working. I even have working 768kHz 32 bit, but ot XMOS platform with DSD1024. I left AVR32 as it didn't have the power anymore. To get 384 working I had to overclock it from 66MHz (default audio-widget sys freq) to 84 MHz (atmel says all chips can do 84MHz since some revision, so its not really a overclock i guess) and I think B internal bus is running on sysclk speed instead of sysclk/2. 384/32 bit is maximum this AVR32 can do IMHO. Was a long time ago.

On Fri, 19 Oct 2018 at 13:23, Iliya Miroslavov Iliev < notifications@github.com> wrote:

Thanks for the quick response. 24576 / 384 is 64 (both channels). Don't tell me You managed to get 32bit 384k.

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/dohnalik/sdr-widget-experimental-384/issues/1#issuecomment-431331478, or mute the thread https://github.com/notifications/unsubscribe-auth/AJtNgF3UsZgbYNtdD3_BzB1s7ugLwJupks5umbY3gaJpZM4XwI1n .

imiroslavov commented 5 years ago

That would be interesting read. 384/32 is enough for me (it is an overkill anyway).

imiroslavov commented 5 years ago

Are there any significant changes in Your schematics?

imiroslavov commented 5 years ago

Here is a link to the original thread in case someone wants to build it. https://groups.google.com/forum/?hl=en#!searchin/audio-widget/384%7Csort:date/audio-widget/PyjAU1Fmyhg/L9cubFtOAwAJ