Using ASRC and not getting audio output from analogue connector

Hello,

I tried your project and brought in a TDM8 via serial input port 2 (slave), Incoming TDM8 has 2 audio channels and 6 sine tones from another Eval board. I route first 4 channels thru ASRC to the core, you can see in the schematic, and it seems fine.

Now coming to your problem, I can see a few things there.

1) You have set the DAC as well as the serial output port 0 as slave. So, there are no clocks here between these two parts, hence you didn't get anything.

2) You have set the DAC in stereo mode and your serial port 0 is set for TDM8.

I just did one change in your project to make it work (to hear output at OUT1), I set the serial out port 0 as master and in stereo mode.

I assume you want your DAC in stereo mode, if you want any specific configuration then let me know.

Here is the updated project. Dante_TDM8_Input_Test_upd.dspproj

I have just corrected your project just to work; I have no idea what your entire requirement is with programming codec etc. So, explain a little about your requirement if you need further assistance.

Regards,

Harish

Hmmmm, just silence when I run this. I can see the signals metering fine, and tracking external volume control. but just not getting audio out...

I cleaned up my original file to focus on a simplified case. All I want to do is listen to the output of the ASRC0 source to confirm the ASRC is working and I can get my asynchronous source into the DSP for manipulation. Really just verifying through listening to the DAC output.

Dante_TDM8_Input_Test v2.dspproj

Thank you!

Hello,

Your project does work for me without any modification done. All I did was changing the source in the router, so your project works fine.

If you can see the signal in the core (using meters), then have a look if the DAC registers are properly configured. If possible, probe the serial out port 0 and see if signals are going out.

I have no problem running your project, so have a close look at what's happening in your end.

Regards,

Harish

That is very strange.... In my project I have the DAC registers exposed (since I have modified my eval board to have control over the Codec), do you think my settings for the codec are correct in the file I sent you? I'll see if I can probe the serial port. Thank you!

Hello MDThommo81,

So which exact eval board do you have? Feel free to take a picture. What modification did you do? Is it the one I detailed in the user guide that connects the USBi directly to the codec?

Dave T

Hi David,

I have the EVAL-ADAU1452REVBZ, see attached images. Yes, I made the mods as per your guide in the manual.

Thanks. Mark.

In reading my own post to you just now, something looked off... I changed my codec setting BCLK Active Edge back to "Latch end-cycle" as per following image, and now it all works fine. So thank you Harishgowtham and DaveThib !

Can I ask. Is there a whitepaper, or some publication/video, that explains all of these different settings you can apply? I mean, I randomly click through them until something works (normally). Understanding what they all actually mean and how they impact the signal tx/rx process would be great, and result in less requests for support from you guys! But, until then, I'm happy to learn through doing, and failing a few times...