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ADAU1467 Evaluation board?
ADAU1467 Evaluation board?
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Old 24th June 2018, 11:43 AM   #11
dspswede is offline dspswede  Sweden
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Quote:
Originally Posted by KaffiMann View Post
Very nice! Are you considering making some group buy or?
Not sure exactly what you mean.

I have pick and place machine and can manufacture thoose boards myself.

But maybe you refer to sell them?
If anyone wants them they are for sale.
Not my original plan, but sharing is a necessity especially to share the sw effort with the community.

Due to vacation no assembled pcba to be expected before late August.

And normally it's always a risk for something to be fixed in a completely new design.
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Old 25th June 2018, 05:58 AM   #12
KaffiMann is offline KaffiMann  Norway
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I am very certain there is a lot of people that would be interested.
You should at the very least consider costs and what you would sell it for, most of us do not have access to automated production equipment.

Not many DSP setups that can do 8 channels x 2 way speakers.
And there is also a shortage of more than 4x out DSP kits to work with the Raspberry.

No worries about the time aspect, most here do other stuff in the summer.

Last edited by KaffiMann; 25th June 2018 at 06:01 AM.
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Old 25th June 2018, 08:12 AM   #13
dspswede is offline dspswede  Sweden
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Ok.

Cost is a bit unclear but components alone probably mounts up to $100 range.

Also the wish list from the community is unclear.

I was now planning on adding MM/MC input as well.

Already is optiken to mount Bluetooth module.

What I want to follow up with later is class D amplifiers fed directly over I2S/TDM

Thats my goal to go digital all the way to the speaker element.

And have all elements individually boxed.
I would like to get out of the composite speaker mentality and into the single element mindset.

Updates will follow.
I am doing the USB to SPI interface now as that was fairly costly from analog device as an eval board.

Option to run both RPI3 as master or the PC
RPI3 can still control the codecs even in the case that PC control the DSP.
Selectable trough switches.

I also wonder how I can measure the THD and everything to make sure it really delivers top quality.
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Old 25th June 2018, 09:25 AM   #14
dspswede is offline dspswede  Sweden
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I would like to get I2s in/out from the RPI as well.

Trying to figure out how that normally is done.
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Old 26th June 2018, 09:40 AM   #15
dspswede is offline dspswede  Sweden
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did the usb -> spi/i2c adapter.
a bit expensive to keep buying as eval-kit

http://www.analog.com/media/en/techn...es/AN-1006.pdf
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Old 26th June 2018, 10:15 AM   #16
KaffiMann is offline KaffiMann  Norway
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How many channels are available on the USB interface?
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Old 26th June 2018, 10:20 AM   #17
dspswede is offline dspswede  Sweden
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Same as the original.

5 I think it is.
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Old 26th June 2018, 10:25 AM   #18
dspswede is offline dspswede  Sweden
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Originally it was a 14 pin footprint only populated by 10pin idc in the center.

I will populate with a 14p as seen on the 3D.

Channels being chip select in this specific lingo.

So even the original has 5, if you change the connector to 14p
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Old 26th June 2018, 10:36 AM   #19
KaffiMann is offline KaffiMann  Norway
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I do not know whether this translates to any new functionality or not.
But thank you :-)

Regarding RPI pinout, does this help?
I2C at Raspberry Pi GPIO Pinout

and:
Raspberry Pi 2 & 3 Pin Mappings - Windows IoT | Microsoft Docs

The Raspberry Pi: Audio out through I2S | Dimdim's Blog

I do not understand completely what you are having difficulties with. Ref: your post #14

Edit:
Excerpt from Dimdim's page:
"So, the theory is sound and the RPi’s clock is not up to snuff by strict standards. What this means is that the RPi’s I2S output is not capable of “Hi End” audio transmission. It is essentially not bit perfect (edit: this is not correct, strictly speaking. It is in fact bit perfect, it is just not “proper”.).

In the real world, chances are that this problematic clocking will not be particularly audible under normal circumstances, say with a normal-specc’ed sound system. But an audiophile should definitely steer clear of the RPi’s I2S output, instead opting for a USB to I2S interface."

Last edited by KaffiMann; 26th June 2018 at 10:44 AM.
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Old 26th June 2018, 10:46 AM   #20
dspswede is offline dspswede  Sweden
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Quote:
Originally Posted by KaffiMann View Post
I do not know whether this translates to any new functionality or not.
But thank you :-)

Regarding RPI pinout, does this help?
I2C at Raspberry Pi GPIO Pinout

and:
Raspberry Pi 2 & 3 Pin Mappings - Windows IoT | Microsoft Docs

The Raspberry Pi: Audio out through I2S | Dimdim's Blog

I do not understand completely what you are having difficulties with. Ref: your post #14

never used i2s on rpi before did not even know it existed, so i did anticipate external circuitry.

as it is there native, the problem went away by itself :-)
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