How are you supposed to send an array using the ActiveX SigmaStudioServer in Matlab, using the REGISTER_SAFELAOD_ARRAY method?

mhenry Question

Jun 7, 2024 00:00

How do you send an array using the ActiveX server to connect to SigmaStudioServer in Matlab, using the REGISTER_SAFELAOD_ARRAY method?

I am absolutely flabbergasted that the following code excerpt does not work:

```
clc; clear; close all;

% Add SigmaStudio installtion directory to path
addpath('C:\Program Files\Analog Devices\SigmaStudio 4.7');

% Intantiate SigmaStudio server and invoke the interface
ss = actxserver('Analog.SigmaStudioServer.SigmaStudioServer');
ssServer = ss.invoke('ISigmaStudioServer');

% Query for existing values (this part works).
test = ssServer.REGISTER_READ_ARRAY("IC 1", 0x204C, 640);

% Send existing values back to same address (this part fails).
ssServer.REGISTER_SAFELAOD_ARRAY("IC 1", 0x204C, 4, test);

```

I get the following error:

```
Error using Interface.2942E58A_4461_410E_87B3_64152C81935F/REGISTER_SAFELAOD_ARRAY
Error: The parameter is incorrect.
```

software

ADAU1787

sigma studio 4.7

Integrated/Special Purpose A/D Converters

sigmastudioserver

matlab

server

array

Audio CODECs

sigma script

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mhenry Reply

Jun 11, 2024 00:00

Noted a typo in the original post, I corrected it and it doesn't change the negative outcome:

```
% Changed 4 bytes to 640 bytes, as in the line above.
ssServer.REGISTER_SAFELAOD_ARRAY("IC 1", 0x204C, 640, test);
```

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mhenry Reply

Jun 11, 2024 00:00

I have also tried all different combinations of `REGISTER_WRITE_ARRAY` and `REGISTER_SAFELAOD_ARRAY` etc.

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mhenry Reply

Jun 11, 2024 00:00

Update -- solved it. For anyone looking later on:

In Matlab, you need to use this to properly format the array.

`feature('COM_SafeArraySingleDim', 1)`

And here's my hacky method to prep the array for export:

```

function y = prepForAdau(x)

nBytes = length(x) * 4;
y = uint8(zeros(nBytes, 1));

pIn = 1;
pOut = 4;
for n = 1:length(x)

val = x(n);
val = int32(val * 2^23); val = typecast(val, 'uint8'); val = fliplr(val); val = val';

y(pIn:pOut) = val;

pIn = pIn + 4;
pOut = pOut + 4;
end

end

```

See here for a longer explanation:

ez.analog.com/.../sigmastudio-server-matlab-register-write--what-s-missing

www.mathworks.com/.../92424-how-can-i-pass-arguments-to-an-activex-server-from-matlab-7-0-r14-as-one-dimensional-arrays

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DaveThib Reply

Jun 11, 2024 00:00

Hello mhenry,

Thanks so much for taking the time to come back and post this! This is not something I use much in my daily work and the few people who do are very busy so I have not had the time to chase down answer for you.

Dave T

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