Conversion des types de données

Conversion d’un type de données en un autre

La conversion des types de données fait référence au changement d'un type de données en un autre. Fixed-Point Designer™ vous permet de créer et d'optimiser des types de données qui répondent aux exigences de précision numérique et aux contraintes du hardware cible.

Rubriques

Parameter and Signal Conversions
Conversions of data types of parameters and signals in Simulink^® simulations.
Conversions and Arithmetic Operations
Example highlighting how the data types are converted and arithmetic operations are performed on inputs and parameters in the Simulink software.
Arithmétique à virgule fixe
L’arithmétique de l’addition, de la soustraction, de la multiplication, des opérateurs cast et modulo, et du complément à deux.
Cast from Doubles to Fixed Point
Example based on the fxpdemo_dbl2fix model, which highlights many of the key features of the Fixed-Point Designer software.
Display Port Data Types
Three parts of the port display for fixed-point signals: the data type, the number of bits, and the scaling.
fi Objects and C Integer Data Types
Comparison of ANSI C integer data type ranges, conversions, and exception handling with those of fi objects.
Cast fi Objects
Information on casting fi objects.

Exemples présentés

Double to Fixed-Point Conversion

How to convert signals between built-in and fixed-point data types and illustrates how fixed-point data types affect the representable precision and range. The fixed-point data type used in this model is fixdt(1,5,2), which is a signed 5-bit number with 2 bits to the right of the binary point:

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Fixed-Point to Fixed-Point Inherited Conversion

Use the Data Type Conversion block FixPt To FixPt Inherited. Because Simulink® propagates data types throughout a block diagram, fixed-point utility modeling can be templatized for multiple use scenarios. The data type inheritance capability can be given additional information through the use of various relative-type specifications. The FixPt To FixPt Inherited block provides a way to specify that "this signal should have the same fixed-point data type as that signal" by wiring it up to the signals of interest.

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