Fixed-Point Conversion - MATLAB & Simulink (original) (raw)

Convert floating-point code to fixed point, optimize fixed-point data types (requires Fixed-Point Designer™)

If you have the Fixed-Point Designer product, to meet target hardware constraints, generate fixed-point C/C++ code.

Classes

Functions

Topics

Automated Fixed-Point Conversion Workflow

• Automated Fixed-Point Conversion
  Using the command line to perform automated fixed-point conversion.
• Automated Fixed-Point Conversion Best Practices
  Generate fixed-point code according to best practices.
• MATLAB Language Features Supported for Automated Fixed-Point Conversion
  For automated fixed-point conversion, use supported MATLAB® language features.
• Fixed-Point Code for MATLAB Classes
  Use supported constructs and coding style best practices for fixed-point conversion of MATLAB classes.
• Convert MATLAB Code to Fixed-Point C Code
  Generate fixed-point C code with codegen.
• Convert Fixed-Point Conversion Project to MATLAB Scripts
  Use project settings for fixed-point conversion at the command line.

Propose Fixed-Point Types

• Specify Type Proposal Options
  Specify options used when proposing types for automated fixed-point conversion.
• Propose Fixed-Point Data Types Based on Simulation Ranges
  Propose fixed-point data types based on simulation ranges using the codegen function.
• Propose Fixed-Point Data Types Based on Derived Ranges
  Propose fixed-point data types based on static ranges using the codegen function.

Function Replacements

• Replacing Functions Using Lookup Table Approximations
  Generate lookup table approximations to replace custom functions or functions that are not supported for fixed point.
• Replace the exp Function with a Lookup Table
  Replace a function with a lookup table approximation in fixed-point code generated with the codegen function.
• Replace a Custom Function with a Lookup Table
  Replace a custom function with a lookup table approximation function by using the codegen function.

Verify Fixed-Point Conversion

• Visualize Differences Between Floating-Point and Fixed-Point Results
  Use a custom plot function to compare the behavior of the generated fixed-point code against the behavior of the original floating-point MATLAB code.
• Enable Plotting Using the Simulation Data Inspector
  Inspect and compare floating-point and fixed-point logged input and output data.
• Custom Plot Functions
  Visualize numerical differences during fixed-point conversion.
• Detect Overflows
  Detect overflows at the command line.

Troubleshooting

• Generated Fixed-Point Code
  Avoid issues with generated fixed-point code.
• Data Type Issues in Generated Code
  Highlight potential data type issues in report.