MATLAB REAL-TIME WORKSHOP EMBEDDED CODER - S Bedienungsanleitung PDF herunterladen (Seite 18)

3.2 Real-Time Workshop Embedded Coder

Real-Time Workshop Embedded Coder is a well integrated tool in Simulink. To

generate code for fixed-point another Matlab tool, called Fixed-Point Toolbox,

has to be used. This tool is used for scaling parameters and signals. The user

chooses the signal/parameter type, scaling factor and offset value directly in every

block in the model. Some blocks do not need to be scaled, e.g. saturation block

which automatically gives an output that has the same scaling as the input.

3.2.1 Automatic Scaling

Automatic scaling is supported in Real-Time Workshop Embedded Coder, but

worst case automatic scaling is not. An automatic scaling can be performed based

on simulation inputs. A simulation must first be run to log in the maximum and

minimum values of every signal in the model. The maximum and minimum

simulation values must cover the full intended operating range of the design in

order to obtain meaningful results. It is the user’s responsibility to run and find the

worst case input values for the simulation which guarantee a full coverage of the

worst case ranges.

3.2.2 Generating Code for One Subsystem

To make the generation of the code easy, it is recommended to use a model

reference for that part of the main model that code will be generated for. In that

way, the code will be generated easily and independently from the rest of the

Simulink model that may have been added for testing reasons. For traceability

reasons every subsystem can have its own function. This is possible if the user

chooses the right options in the Subsystem Parameters dialog, a precondition is

that the subsystem is atomic. See Figure 3. If a subsystem is atomic it will be

treated as having direct feedthrough and thus be sorted to execute before any

blocks that depend on it.

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MATLAB REAL-TIME WORKSHOP EMBEDDED CODER - S Bedienungsanleitung Seite 18