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Old 11th March 2012, 10:00 PM   #1911
PHEONIX is offline PHEONIX  Australia
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Hello Wktk_Smile

>I use Arduino with Hifiduino code as a external dac controller.

Which Arduino board do you use.

Regards
Arthur
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Old 12th March 2012, 02:13 PM   #1912
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Arduino UNO.
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Old 18th March 2012, 03:37 AM   #1913
Dimdim is offline Dimdim  Greece
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Hi guys,

Has anyone had any luck making sense of the Registers #48-71?

They are supposed to provide a lot of information on the status of the s/pdif channel like clock accuracy, sample frequency, word length, etc.

I am not having trouble reading them, but I'm getting a bunch of 0s on most of them that don't really seem to match up to the data I should be getting according to the datasheet.

I am using a modified version of the Hifiduino code on a Mega with a 2.8" TFT screen.
(btw, great job glt, I am really greatful for the code)
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Old 19th March 2012, 10:07 PM   #1914
glt is offline glt  United States
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Post a photo of the TFT screen...
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Old 19th March 2012, 11:29 PM   #1915
Dimdim is offline Dimdim  Greece
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Here you go:

Click the image to open in full size.

Obviously it is still in development (and on a breadboard ).

The only useful information that I have managed to get from registers 48-71 is the sampling rate (see Register 51 above).

I was hoping to get some more info but the rest of the registers appear to be all zeroes.
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Old 20th March 2012, 12:36 AM   #1916
glt is offline glt  United States
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Dimdim,

Very nice!

I ordered a MEGA and also TFT screen... (the widescreen model from iTead). Will have to wait for the library to be updated...

Regarding the SPDIF registers, I get the feeling they are not used/populated. Think about it, where would the data come from?

Any luck programming the filters?
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Old 20th March 2012, 08:37 AM   #1917
Dimdim is offline Dimdim  Greece
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I assume you ordered the ITDB02-3.2WD, right? It's a very attractive display. Does iTead have any sort of an ETA on the library?

Regarding the registers, I am guessing that since they exist and are read only, it would make sense for them to actually contain data. For instance, the word length.

I have not gotten to the filters yet.. I have put on pause the development of the controller since I'm busy building the actual DAC (B III).
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Old 26th March 2012, 11:52 PM   #1918
Bunpei is offline Bunpei  Japan
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Quote:
Originally Posted by Dimdim View Post
Regarding the registers, I am guessing that since they exist and are read only, it would make sense for them to actually contain data. For instance, the word length.
Hi, Dimdim,

What kind of S/PDIF source device are you using? Is it configured to send "channel status information" through the S/PDIF?

Bunpei
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Old 27th March 2012, 12:46 AM   #1919
Bunpei is offline Bunpei  Japan
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Quote:
Originally Posted by wktk_smile View Post
In the Sabre dac app note, ESS recommends inverted MCLK when that's synchronous, although they only says
"The inverted MCLK ensures that the Sabre noise as low as possible." and there's no further explanations.

Anyone tried these?

As far as I tried myself, (I stolen MCLK from transport via LVDS and made inverted at the LVDS receiver input.)
Hi, wktk_smile,

I'm not sure that this information has something to do with your interest.
The following Japanese web page by a DAC designer reported a possible noise. You may understand the contents written in Japanese language.

DAC

Bunpei

Last edited by Bunpei; 27th March 2012 at 01:11 AM.
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Old 27th March 2012, 01:07 PM   #1920
Dimdim is offline Dimdim  Greece
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Quote:
Originally Posted by Bunpei View Post
Hi, Dimdim,

What kind of S/PDIF source device are you using? Is it configured to send "channel status information" through the S/PDIF?

Bunpei
I'm testing with two sources: a common DVD player and a PC's on-board sound.

I also have a Behringer SRC2496, perhaps I should try with that as well, since it supports a number of output options.
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