ADAU1463 DC=123456, Readback=114688, why?

bradyhsu Question

Jul 20, 2022 00:00

Hi ADI Engineer

I wont to read back value from a DC but it's wrong!

I try other values of the DC and all is wrong, 123456 -> 114688, 123 -> 116, 0xFF -> 0xFE...

I try SigmaStudio 4.7, 4.6 all same problem.

I try different ADUSB boards, then same problem.

Please help me!!!

Audio Signal Processors

software

sigmaStudio 4.7

adau1463

sigmastudio

SigmaDSP Audio Processors

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Harishgowtham Reply

Jul 21, 2022 00:00

Hello bradyhsu,

Sometimes It may give a trouble, I have also experienced that few times. Now I can't simulate the issue as you said. However, I will tell you a quick work around. Please change that readback cell to a continuous mode by clicking the blue button on the readback cell. It will become orange when it's on continuous mode. Now that will read the correct incoming data/value.

Once I tried this and It gave me a good result . Again both normal and continuous mode read correct data for me now. So let me see the continuous mode work for you.

Regard,

Harish

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ADIApproved Reply

Jul 21, 2022 00:00

Hello,

Since you set the DC entry to 32.0 it should be possible to represent quite large numbers.

Could you try the following:

- Ensure the DC entry is downloading the correct number by modifying it after initial download, so you can see the value in the capture window

- Try changing both cells back to 8.24, set the DC cell to 1, then read back. Does that work? What about -1?

Are you on custom hardware or an ADI eval board? If it's custom hardware, you may want to look into your SPI signal integrity.

Josh

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bradyhsu Reply

Jul 21, 2022 00:00

Hi JoshuaB & Harish

Thanks for your answer.

I think it is some poor contact problem.

When i twist my connecter then get correct value.

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