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TargetLink Data Types Application Note September 2004

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Simulink Scaling Parameters and

TargetLink

This application note is about Simulink data types and how they are

dealt with in the TargetLink environment. This includes fixed-point

settings introduced with Simulink 5 .

TargetLink’s General Approach

TargetLink’s approach to production code development is as follows:

■ The control strategy is designed either with Simulink with

subsequent conversion to TargetLink, or with TargetLink’s blockset

from scratch. In either case, the algorithm is simulated with

Simulink’s simulation engine using TargetLink blocks (MIL

simulation mode). All signals are computed in floating-point.

Scaling parameters are tagged to the TargetLink blocks. During

MIL simulations, the resulting ranges are compared to the actual

floating-point signal ranges (overflow detection).

■ Production code is generated according to the scaling parameters

and run on the host (SIL mode) or on a target EVB (PIL mode). This

allows fixed-point effects to be investigated directly.

Thus, fixed-point effects are not investigated using blocks and the

Simulink simulation engine, but using the production code itself.

There is no fixed-point arithmetic in MIL mode.

Simulink’s General Approach

Simulink’s approach to production code development is as follows:

■ The control strategy is designed with Simulink blocks. To allow the

generation of fixed-point code, integer data types are supported.

To scale signals, a Fixed-Point license is needed. When signals are

scaled, the associated blocks mimic fixed-point arithmetic. The

objective of mimicking fixed-point arithmetic is to predict how the

code to be generated will behave on ECU targets.

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Indice de contenidos

Pagina 1 - Simulink’s General Approach

I TargetLi

Pagina 2

▲ TargetLink Data Types A

Pagina 3 - Compiled Scaling Parameters

▼TargetLink Data Types Ap

Pagina 4

▲ TargetLink Data Types A

Pagina 5

▼TargetLink Data Types Ap

Pagina 6

▲ TargetLink Data Types A

Pagina 7 - Typing Parameters

▼TargetLink Data Types Ap

Pagina 8 - Reconversion to Simulink

▲ TargetLink Data Types A

Pagina 9

▲ TargetLink Data Types A

Pagina 10 - ■■■■■■■■■■■■

▼TargetLink Data Types Ap

Pagina 11 - ■■■■■■■■■■I

▲ TargetLink Data Types A

Pagina 12

▼TargetLink Data Types Ap

Pagina 13

▲ TargetLink Data Types A

Pagina 14

▼TargetLink Data Types Ap

Pagina 15

▲ TargetLink Data Types A

Pagina 16

▼TargetLink Data Types Ap

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