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Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

New? Sure Electronics ADAU1701 Module
New? Sure Electronics ADAU1701 Module
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Old 9th October 2016, 10:52 PM   #21
psynapse is offline psynapse  France
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Default A picture is worth

To show how straightforward it is, herewith a picture
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Old 10th October 2016, 02:22 PM   #22
GBDA is offline GBDA
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Hi,

What level shifter do you use ?
Please post a full schematic drawing of your programming setup.

Thank you in advance, it will be appreciated.
GB
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Old 10th October 2016, 09:51 PM   #23
psynapse is offline psynapse  France
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As I mentioned the Freedsp people have done a great job:- I thoroughly recommend their quick start guide for the FreeUSBi (which can be found here https://docs.google.com/document/d/1...it?usp=sharing ).
From that document I have copied their schematic (first enclosure)

The connections (from the cypress chip) that I have replicated are

1) Gnd (from P1.6)
2) Brd_Reset (from P1.15, with the limiting resistor)
3) USB_Pwr_On (from P4.20)
4) SDA (from P1.14)
5) SCL (from P1.13)

(The other connections, LEDs etc are nice, but optional)

Gnd is Gnd, I connected it to J3p4 on the Sure board and the level shifter
Brd_Reset goes to J3p9 via a 470 ohm

That leaves the circuitry around Q1 and Q2 on the FreeUSBi to bodge.

I used this level shifter

1PCS 5V to 3.3V Bi-Directional SPI I2C Logic Level Converter 4way Arduino | eBay

but there are lots out there

The second enclosure gives the schematic for the level shifter.
These are very similar to Q1 and Q2 in the FreeUSBi.

By connecting USB_PWR_ON (from cypressP4.20) to LV on the level shifter (and thence to ground through a 1meg resistor) the original circuit is largely duplicated.
I then feed scl and sda from the cypress into LV1 and LV2 and take them to the Sure board from HV1 and HV2. It seems to work, though I really ought to tie HV to the 3v3 on the Sure board.
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File Type: pdf Logic_Level_Bidirectional.pdf (42.9 KB, 66 views)
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Old 11th October 2016, 06:57 AM   #24
GBDA is offline GBDA
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Thank you for sharing your information,

I order the parts and will post later my experience.

I have already the USBI from Analog Devices and the MiniZ evaluation kit.
It works well.

I ordered one sample Sure board from the Sure store, it was delivered very quickly by DHL.

But it is impossible to program it with the USBI by making a six pin cable from the USBI 10 pin connector.

So I contacted Sure several times by skype and by email, but no reply.
The board is great and very affordable, it is a pity that there is absolutely no support. I don't know if the board works or not.

BR,

GB
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Old 11th October 2016, 07:45 AM   #25
hormilo is offline hormilo  Slovenia
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I have it at home to...also recived the evaluation board...but have no idea where to start. The guy from Sure told me that you only need eval. board to connect it to comp and use sigma studio to program. If I understand correclty, you need to program your own program-interface with sigma studio...is that true?

It would be really great if anyone have an idea how to make this thing work.
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Old 11th October 2016, 10:17 AM   #26
GBDA is offline GBDA
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What evaluation board do you mean ?
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Old 11th October 2016, 10:49 AM   #27
psynapse is offline psynapse  France
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GBDA,

Well you are ahead of me! I am mystified why the Sure board does not work with the USBi. For me, with the configuration I describe, Sigmastudio can read the EEPROM and the register set of the ADAU1701.

The next steps for me are:
1) Tie Self Boot to ground so that I can program from Sigma Studio direct into the ADAU1701 (rather than put boot code into the EEPROM)
2) And once I have stable code, tie WP to ground so that Sigma Studio can write to the EEPROM

Of course something may not go according to plan on one or both of these two steps!!

And I have still to build a standard frequency Mclk
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Old 11th October 2016, 10:54 AM   #28
psynapse is offline psynapse  France
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Hormilo,

Not sure I can help, I am not sure of the difference between the evaluation and production Sure boards. As you can see from my posts, I certainly needed a USBi (as per GBDA), a FreeUSBi or a homebrew (as per my posts).
As a very rough guess, if you can see SCL and SDA on the silkscreening, you probably need one of the I2C interfaces noted above. Perhaps you could post a photo of the board?
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Old 11th October 2016, 10:58 AM   #29
psynapse is offline psynapse  France
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GBDA,
A second thought. You say that you do not know if the board works. Don't forget that the board is preloaded with a two channel crossover in EEPROM. So wiring it up stand alone (ie just power to usb socket) it will pass filtered audio from in to out
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Old 11th October 2016, 03:16 PM   #30
GBDA is offline GBDA
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The DSP board is working but not fully.

I bought the audio extension board too, connected to the DSP board with the supplied 10 pins cable.

Left audio is working but not right.

Pot4 seems to control left level
Pot3 seems to control high pass filter
Pot2 no action ?
Pot1 no action ?

Without any manual it is quiet frustrating ...

No free time before week end now, I will follow my experiment later.

See you
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