Modeling Patterns for C Code Constructs
Apply modeling patterns that generate specific C constructs
Several standard methods are available for setting up a model to generate specific C constructs in your generated code. Using blocks, S-functions, Stateflow charts, MATLAB Function blocks, data objects, and custom storage classes, you can generate C constructs such as: data types, structures, arrays, control flow constructs, functions, preprocessor directives, and pointers. To begin, see Prepare a Model for Code Generation. Also see Standards, Guidelines, and Block Usage.
Topics
Types, Operators, and Expressions
- Typedef
Create data type aliases by generatingtypedefstatements. - Definition, Initialization, and Declaration of Parameter Data
Control the file placement of the declaration, definition, and initialization of parameter data. - Definition and Declaration of Signal Data
Control the file placement of the declaration and definition of signal data. - Data Type Conversion
Create a data type conversion using a Data Type Conversion block, Stateflow Chart, or MATLAB Function block. - Type Qualifiers
Apply theconstandvolatilekeywords to a global variable that represents parameter data. - Relational and Logical Operators
Implement relational and logical operators using Simulink blocks, Stateflow Charts, and MATLAB Function blocks. - Bitwise Operations
Perform bitwise operations using the Bitwise Operator block, a Stateflow Chart, or MATLAB Function block. - Enumeration
To generate an enumerated data type, define an enumeration class in a MATLAB file.
Control Flow
- If-Else
Use a Switch block, a Stateflow Chart, or MATLAB Function block to create anif-elsestatement in the generated code. - Switch
Use a Switch Case block or MATLAB Function block to create answitchstatement in the generated code. - For Loop
Use a For-Iterator Subsystem block, Stateflow Chart, or MATLAB Function block to create aforloop in the generated code. - While Loop
Use a White Iterator Subsystem block, Stateflow Chart, or MATLAB Function block to create awhileloop in the generated code. - Do While Loop
Use a While Iterator Subsystem block or Stateflow Chart to create ado whileloop in the generated code.
Functions
- Function Call
To generate a function call, add a subsystem, which implements the operations that you want. - Function Prototyping
Create a function call using graphical functions or function prototype control. - External C Functions
Integrate legacy C functions in the generated code by either creating an S-function or making a call to an external C function.
Preprocessor Directives
- Macro Definitions (#define)
Generate parameter data as a constant-valued macro. - Conditional Inclusions (#if / #endif)
Include preprocessor conditionals in your generated code by implementing variant blocks in your model.
Structures
- Structures of Parameters
Create a flat structure or nested structures that store parameter data in the generated code. - Structures of Signals
Create a flat structure that contains signal data in the generated code. - Nested Structures of Signals
Create a structure whose fields are also structures. - Bitfields
Store Boolean data in bitfields in the generated code.
Arrays
- Arrays for Parameters
Create an array of parameter data in the generated code. - Arrays for Signals
Create an array of signal data in the generated code.
Pointers
- Pointers
Generate code that accesses data from your handwritten code through a pointer.
