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Define Storage Classes, Memory Sections, and Function Templates for Software Architecture

In a team or large organization, to enable multiple users to generate code that conforms to a standard architecture, you can create and share code generation definitions, such as storage classes, with those users. When configuring code generation settings for different models, the users can apply the definitions to data and function elements in the models, generating standardized code.

Create Code Definitions for Use in the Code Mappings Editor

To control the appearance of model elements in the generated code, you apply code definitions to the elements by using the Code Mappings editor. Configure the default code generation behavior for a category of model elements by selecting a code definition in the default mapping for the category. Configure individual data elements by mapping them to code definitions in the Code Mappings editor.

To create code definitions that you and other users can use in the Code Mappings editor, use an Embedded Coder Dictionary.

When you create definitions in an Embedded Coder Dictionary, decide where to store the definitions by considering how you intend to use them. This table lists where to store the code definitions and how to use Simulink® data dictionaries.

Usage of DefinitionsLocation for Code DefinitionsData Dictionary Use
Multiple models — sharing a set of code definitions to standardize codeSimulink data dictionary that is referenced by all of the models, either directly or through intermediate referenced dictionariesLink each model to a data dictionary that defines the code definitions, either directly or through an intermediate dictionary reference.
One model — prototyping generated code by using one modelLocal Embedded Coder Dictionary of the modelYou can optionally link the model to a data dictionary that contains other data. If you link the model to a dictionary that contains other code definitions, the model can also use those code definitions.

To use an Embedded Coder Dictionary and for its limitations with respect to code generation definitions, see Embedded Coder Dictionary.

Create Code Definitions for External Data Objects

To create definitions for data objects that you store in the base workspace or in a Simulink data dictionary, use the Custom Storage Class designer to create a definition in a package. For these data objects, you apply code generation settings to the data object instead of applying them in the mapping of a model. When an item in a model uses the data object and its code generation settings, the code mapping for the item reflects the specification of the data object. For more information, see Create Storage Classes by Using the Custom Storage Class Designer and Control Data and Function Placement in Memory by Inserting Pragmas.

Use Package Code Definitions in Embedded Coder Dictionaries

If you want to use the same code generation definition in the Code Mappings editor and in data objects, you do not need to store one copy of the definition in an Embedded Coder Dictionary and another copy in a package. Instead, store the definition in a package (by using the Custom Storage Class Designer). Then, configure one or more Embedded Coder Dictionaries to refer to the definition in the package. With this technique, when you want to make changes to the definition, you make the changes in only one place, the package.

To create a code generation definition in a package by using the Custom Storage Class Designer, see Create Storage Classes by Using the Custom Storage Class Designer. Then, to configure an Embedded Coder Dictionary to refer to the package, see Refer to Code Generation Definitions in a Package.

For more information about maintaining definitions in packages and dictionaries, see Migrate Package Definitions to Embedded Coder Dictionary to Use in Code Mappings.

Constrain Use of Storage Class Code Mappings

When defining a storage class in the Embedded Coder Dictionary, you can specify whether users can map the storage class to parameters, signals, or parameters and signals. To constrain the use of a storage class, the Data Initialization property must be set to None. Then, in the Property Inspector, under Allowed Usage, select Parameters, Signals, or Parameters and Signals. For more information, see Embedded Coder Dictionary.

Deploy Code Generation Definitions to Users

In a large organization with multiple models and users, you can share code generation definitions by storing them in a mutually accessible location. The process of sharing code definitions is called deployment. For more information, see Deploy Code Generation Definitions.

Interact with Code Generation Definitions Programmatically

You can create and interact with code definitions by using the Embedded Coder Dictionary API.

  1. Represent the Embedded Coder Dictionary by using a coder.Dictionary object. Use the object to access the sections of the dictionary: Storage Classes, Memory Sections, and Function Customization Templates. If you have a package of code definitions, use the coder.Dictionary object to load and refresh the package in the dictionary.

  2. Represent a section of the dictionary by using a coder.dictionary.Section object. Use the section to access code definitions.

  3. Represent a code definition by using a coder.dictionary.Entry object. Use the entry to interact with the code definition and its properties.

You can also use functions such as coder.dictionary.copy and coder.dictionary.move to perform operations on Embedded Coder Dictionaries. For more information, see Create Code Definitions Programmatically.

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