MATLAB: Data store memory storage class

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I have a model containing a data store that I have to convert to C code. I would like to set the "Storage class" attribute of the data store to ExportedGlobal in order to have it defined as a global variable in the corresponding C code, however I cannot find this parameter in the mask of the Data store Memory block. Where can I find this property? Is there a different way to force some variable in the generated code to be global?

Best Answer

Create a Simulink.Signal object in the workspace and you can use DataStore Read/Write block anywhere in the model. You can speify the storage class in the signal object. This is the same as create a DataStoreMemory block in the root level of your model.

If the DataStoreMemory block is in a subsystem, check the option "data store name must resolve to simulink signal object" in its dialog to link to the signal object.

see https://www.mathworks.com/help/releases/R2020b/simulink/ug/using-global-data-with-the-matlab-function-block.html#bsgs3fa-1

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MATLAB: Ways to define ‘data store memory’ block

This is on that page. Create A=Simulink.Signal in base workspace, then you can use DataStoreRead or DataStoreWrite block with data store name as "A" anywhere.

You can use Simulink.Signal objects in addition to, or instead of, Data Store Memory blocks to define data stores. A data store defined in the base workspace with a signal object is a global data store. Global data stores are accessible to every model, including all referenced models. See Data Stores for more information.

MATLAB: How to create signals that have specific attributes in Simulink 7.4 (R2009b)

To assign and validate signal attributes in a model, use the Simulink.Signal class to define a signal object in the MATLAB workspace. This will allow you to define your signal with specific attributes. You can also use this signal object to initialize a signal in your model. To do this, follow these steps:

1) Define a Simulink.Signal object in the workspace:

mySig = Simulink.Signal
mySig.RTWInfo.StorageClass = 'ExportedGlobal'  % Set its storage class to 'ExportedGlobal'
mySig.InitialValue = '10' % Set the signal's initial value

2) In your model, select a signal to validate against MySig object. Right click on a signal, choose signal properties and name the signal as mySig. Check the 'Signal name must resolve to Simulink.Signal object' option.

To learn more about Simulink.Signal objects, please refer to:

https://www.mathworks.com/help/releases/R2012b/simulink/slref/simulink.signal.html

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MATLAB: Ways to define ‘data store memory’ block

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