MATLAB: How to specify a different header file name for each Simulink data object when using the ExportToFile custom storage class with a FlatStructure type in Real-Time Workshop Embedded Coder 4.0 (R14)

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I am using the ExportToFile custom storage class found in the Simulink package and changed the type of the storage class to FlatStructure. However, whenever I use objects with this custom storage classes in different models, the generated header files have the same name.

I would like to specify the header file name as an instance specific property of each of my objects.

Best Answer

The ability to specify the header file name as an instance specific parameter is not available when using the ExportToFile custom storage class with a FlatStructure type in Real-Time Workshop Embedded Coder.

To workaround this issue, create a Custom Storage Class with a storage class type of Other and define the storage class using the Target Language Compiler. Note you will need to use the advanced mode of the CSCDESIGNER:

cscdesigner -advanced

Please navigate to the following location within the Real-Time Workshop Embedded Coder documentation for more information:

 Real-Time Workshop Embedded Coder > Custom Storage Classes

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MATLAB: Is “instance-specific” not an option for grouped Custom Storage Classes (e.g., FlatStructure) when using the Custom Storage Class Designer (cscdesigner) tool from Real-Time Workshop Embedded Coder

A grouped Custom Storage Class (such as "FlatStructure") combines multiple pieces of data into a single (grouped) data structure. All data related to a grouped Custom Storage Class must therefore have the same HeaderFile, DataScope, Initialization, etc., since they are all part of the same structure. Consequently, if a Custom Storage Class is grouped, no option exists to specify these Custom Storage Class attributes on an "instance-specific" basis.

You can follow the steps from this guided example in the documentation to compare how an unstructured (such as "Default") storage class would look as compare to the "FlatStructure" one.

Imagine an example such as the following one, containing three constants and a multiplexer:

Using a custom package and a custom storage class, it is possible to compare the results for both cases:

Code generated with "Default" storage class:

Code generated with "Struct" storage class:

As you can see in this last image, choosing a structured-type storage class will generate a structure containing C1, C2 and C3 (remember each of these is an instance of the custom storage class). Precisely because we have chosen the instances to be put together into a structure, it is not possible to break the code in a way such as a different header file can be provided for each of the instances.

Having a non-structured class, however, allows for the declarations to be present in different header files (one for each of the constant values).

For a grouped storage class (such as "FlatStructure"), you can still specify the header file, by choosing the "Specify" option in the "header file" property. You can thus define all of their parameters in a single header file (ie, use the same header file for all their software components)
If you need to provide a different header file for each of the instances, using a non-grouped storage class will provide this capability.

MATLAB: How to link the TLC definitions to Custom Storage Classes in Real-Time Workshop Embedded Coder 4.0 (R14)

This bug has been fixed for Release 14 (R14). For previous releases, please read below for any possible workarounds:

The CSCDESIGNER was introduced to help ease the creation of Custom Storage Classes for customers who considered the creation of TLC-files to be too high of a threshold for entry. It is expected that the options available here will cover the most used cases. However, there is a large number of situations where this will not be the case. For these situations, try using the following calling command:

cscdesigner -advanced

This will make a subtle change. Now, in the General tab of the definition area the "Type" pull down menu will have an option for "Other". When this is selected, an "Other Attributes" tab will appear which will allow you to enter the low-level TLC options.

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Related Solutions

MATLAB: Is “instance-specific” not an option for grouped Custom Storage Classes (e.g., FlatStructure) when using the Custom Storage Class Designer (cscdesigner) tool from Real-Time Workshop Embedded Coder

MATLAB: How to link the TLC definitions to Custom Storage Classes in Real-Time Workshop Embedded Coder 4.0 (R14)

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