Stateflow

Fixed-Point Data

Fixed-point numbers use integers and integer arithmetic to approximate real numbers. They are an efficient means for performing computations involving real numbers without requiring floating-point support in underlying system hardware.

The following topics describe fixed-point data in Stateflow. Be sure to read Tips and Tricks for Using Fixed-Point Data in Stateflow when you are ready to begin using it.

• Fixed-Point Arithmetic -- Provides a general discussion of the underlying arithmetic of fixed-point numbers.
• How Stateflow Implements Fixed-Point Data -- Describes the parameters that Stateflow uses to define fixed-point data.
• Specifying Fixed-Point Data in Stateflow -- Tells you where and how to specify fixed-point data in Stateflow.
• Tips and Tricks for Using Fixed-Point Data in Stateflow -- Gives you guidelines for using fixed-point data in Stateflow.
• Offline and Online Conversions of Fixed-Point Data -- Describes conversions of fixed-point numbers from one type to another that take place during code generation (offline) and execution (online).
• Fixed-Point Context-Sensitive Constants -- Tells you how to specify fixed-point constants that take their data type from the context in which they are used.
• Supported Operations with Fixed-Point Operands -- Provides a reference list of all supported operations with fixed-point numbers.
• Promotion Rules for Fixed-Point Operations -- Describes the data types automatically selected by Stateflow to receive the results of operations with fixed-point numbers.
• Assignment (=, :=) and Cast Operations -- Describes the data types that result from assignment operations with fixed-point numbers.
• Overflow Detection for Fixed-Point Types -- Tells you how to detect errors that result from exceeding the numeric capacity of fixed-point numbers.
• Sharing Fixed-Point Data with Simulink -- Tells you how to specify fixed-point data in Simulink that it shares with Stateflow as input from Simulink and output to Simulink data
• Fixed-Point "Bang-Bang Control" Example -- Examines an example using fixed-point data in Stateflow to perform limited floating-point operations on an 8 bit processor.

Typecast Operations

Fixed-Point Arithmetic