Programmatic Control through MatLab Documentation

SigmaDSP & SigmaStudio Fishlamp Sep 17, 2013 00:00 2 replies Original on forum ↗

ICs: AD1940

Thread Summary

The user is trying to control the gain or delay on a SigmaDSP 1940 development board using MATLAB. The final answer suggests using a tutorial for safeload writes on the ADAU1701, as the general principle is the same. The user needs help with the REGISTER_SAFELOAD_WRITE() command to write values over the USB I2C port.
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Fishlamp Question

Sep 17, 2013 00:00

Hello, I am presently working with the SigmaDSP 1940 development board, and would like to control the DSP through Matlab, to programmatically change the gain or delay, but I cannot figure out the values written to the Safeload registers. Using the compilation log, and changing the gain in the gui, I can get the address that the data is written to, but I don't understand how the bytes are calculated, to result in the 3 databytes written to the RAM. Is there any documentation on how SigmaStudio does this, so that I could sweep over gain or delay values?

An alternative would be how to control the gain value in the gui, so that I could simply write a value to the gui, which then updates the chip, though this method would add some delay time.

Thanks,

Keith McKinzie

ad1940

Audio Signal Processors

documentation

matlab

sigmastudio

SigmaDSP Audio Processors

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ADIApproved Reply

Sep 17, 2013 00:00

I don't have a full tutorial for this at the moment, but Nando.One shared a nice tutorial for doing safeload writes on the ADAU1701, which you can find here: https://ez.analog.com/thread/15537. The addresses differ from that of the AD1940, but the general principle is the same. Hopefully this will help you get started.

I am traveling on a business trip at the moment so I unfortunately can't spend too much time right now writing a tutorial. Let me know if you run into problems.

Brett

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Fishlamp Reply

Sep 20, 2013 00:00

Brett,

Thank you for referring me to the tutorial, it was very helpful, I believe I am all set, but I just need to know a few commands so that I can write my values from matlab. I need to do a hardware safeload, but I don't know how to get Matlab to write to the safeload registers over the usb I2C port. The command, REGISTER_SAFELOAD_WRITE() seems to be along the write lines, but I don't know the syntax and how it is used.

Any particular ideas?

~Keith M.

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