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Variant Code Generation

Generate code for models containing variant blocks, variant parameters, variant transitions, and symbolic dimensions

You can include alternate designs of variant blocks, variant parameters, variant transitions, and symbolic dimensions in generated code. Variants in the generated code enable you to reuse and configure the code for different stages of development, such as testing different implementations or providing multifunctional code to third parties. You can activate or deactivate the variants depending on the variant control you select. For more information on variant controls, see Introduction to Variant Controls. You can also control the appearance, placement, definition, and declaration of variant controls in the generated code.

To generate code for the variable components in your model, install Embedded Coder^® or Simulink^® Coder™.

Topics

Prepare Variant-Containing Model for Code Generation
Configure and generate code for a variant model.
Generate Code for Export-Function Model
Generate code for functions that can be integrated with an external scheduler.

Featured Examples

Create Variant Controls Using an In-Memory Enumeration Class

Each variant choice in a Simulink® model is associated with a conditional expression called a variant control. The variant control that evaluates to true determines the active variant choice in the model. This example shows how to create variant controls in your model using an in-memory enumeration class. The enumeration is created using the Simulink.defineIntEnumType function. You do not need to save the enumeration in a MATLAB® file. In code generation, enumerated types improve readability because condition values are represented as meaningful names instead of literal values.

Open Model

Create Variant Controls Using MATLAB Enumeration Class

Each variant choice in a Simulink® model is associated with a conditional expression called a variant control. The variant control which evaluates to true determines the active variant choice in the model. This example shows how to create variant controls in your model using a MATLAB® enumeration in the variant condition expressions. In code generation, enumerated types improve readability because condition values are represented as meaningful names instead of literal values.

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Generate Code from Variant Blocks with Startup Activation Time

Simulate and generate code for variant blocks with startup activation time.

Open Model

Generate Code from Nested Variant Subsystem with Code Compile and Startup Activation

Illustrates how code compile and startup variant activation time can be used together in two nested variant subsystems.

Open Model

Compile Code Conditionally for All Values of Variant Parameters with Same and Different Dimensions

Generate a C code that contains all the active and inactive values of variant parameters. The values are enclosed in preprocessor conditionals #if and #elif that enables you to compile the code conditionally based on the condition that evaluates to true.

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Run Executable for Different Variant Parameter Values Without Recompiling Code

Generate an executable that runs for different set of variant parameter values without needing to recompile the code for each set of values.

Open Model

Improve Code Readability of Variant Parameters Using Enumerated Types

You can use enumerated types to improve code readability of variant control values in variant parameters. Simulink Enumerations improve readability because enumerated types of variant controls values are represented as meaningful names instead of integers in the generated code.

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Reuse Variant Parameter Values from Handwritten Code Using Simulink.Parameter Variables

Use Simulink.Parameter variables to generate a code that imports variant parameter values from your existing code. Importing variant parameter values allows you to reuse the values that your existing code defines. You can then integrate and compile the generated and existing code into a single executable. You can choose to generate a code that imports variant parameter values at the beginning of code compile, simulation-loop, or model startup phases of simulation and code generation workflows based on the activation time you specify. For more information, see Activate Variant During Different Stages of Simulation and Code Generation Workflow.

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