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Old 31st October 2012, 07:11 PM   #321
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This is getting exciting...
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Old 31st October 2012, 07:57 PM   #322
chaparK is offline chaparK  Luxembourg
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We already mentioned somewhere in this thread that I could make available volume control of external DACs via SPI or I2S or GPO. That can be of interest for you only if your DACs accept some sort of volume control.
Sorry i meant I2C here above.
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Old 31st October 2012, 08:10 PM   #323
Ryssen is offline Ryssen  Sweden
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I have the nanoDIGI at the moment and it uses volume on the Spdif I think it´s working fine.
If you don´t have any plans on volume on the Spdif,I could use nanoDIGI only as a volume control before your board.
Are you planning on explaining the feautures of the software?
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Old 1st November 2012, 12:05 AM   #324
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Will there be a PEQ?
Have you any idea ,if used only digital,will it outperform the nanoDIGI
Soundwise?
nanoDIGI 2x8K | miniDSP
that min-dsp board is weird. It has SPDIF outputs but no headers with I2S so you can piggyback it directly on your own DAC board !! Weird or what !!
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Old 1st November 2012, 10:05 AM   #325
Ryssen is offline Ryssen  Sweden
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Weird or not,it works with Spdif (and no I2S)wich I knew when I bought it..
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Old 1st November 2012, 01:17 PM   #326
knuisje is offline knuisje  Netherlands
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Indeed very weird they don't expose the I2S points on a header.

The nanodigi uses an AK4101a 4-outputs DIT. This ic receives the eight channel I2S signal from the dsp on pins 3-6 and 9-10. You just have to search on the pcb for convenient points to tap these pins.

Last edited by knuisje; 1st November 2012 at 01:20 PM.
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Old 1st November 2012, 01:22 PM   #327
chaparK is offline chaparK  Luxembourg
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How about discussing miniDSP products on miniDSP forums?
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Old 1st November 2012, 01:23 PM   #328
Ryssen is offline Ryssen  Sweden
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I think the dsp crew knew wich pins it is,it was sommething with the waranty...
Thats weird..
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Old 2nd November 2012, 12:10 AM   #329
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How about discussing miniDSP products on miniDSP forums?
Good idea

How are things coming along ?
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Old 2nd November 2012, 10:38 AM   #330
chaparK is offline chaparK  Luxembourg
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Originally Posted by dahlberg View Post
How are things coming along ?
It's all going alright, thanks for asking.

I successfully connected a device on one I2S expansion port.
Just to summarize, this port always works in slave mode - i.e. the device must supply the sync and the bit clock. The board is happy with any sample rate because the data goes through the sample rate converter, spitting out data at the rate selected for the processing (48 kHz, 96 kHz or 192 kHz).
If there's still interest for this, we'll see in a future revision how to organize a master clock fed through that same port. This was requested by a member in this thread, and I had already said that I had made the hardware change to allow this - but we'll need to figure out how to make the software compatible with this option, as that supplied master clock would become the system clock.

I also had the second I2S port working. It's spitting out 6 DSP channels freely routed - i.e. the user selects in the application what DSP channels he wants to collect on the expansion port. This second expansion port always works in master mode: this means that it supplies the sync and the bit clock at the selected DSP rate (again, can be 48 kHz, 96 kHz or 192 kHz).

I'm currently busy with the firmware update procedure which will allow the application to flash the board with a new firmware - for both the DSP and the MCU.

Regarding hardware, it's all fine although a bit slow, sorry again for this. The PCBs have been manufactured and the stencil for assembly is ready too. We're currently waiting delivery of the last components in order to start assembly. This is unfortunately out of my control because some parts have an um-compressible lead-time.

Cheers

Nick
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