MATLAB REAL-TIME WORKSHOP EMBEDDED CODER - S Bedienungsanleitung PDF herunterladen (Seite 34)

6.2 Supported Simulink Blocks and Their Properties

6.2.1 TargetLink

In a TargetLink subsystem the user can use TargetLink simulation blocks,

TargetLink utility blocks and supported Simulink blocks. Appendix II shows all

available blocks that the user can use to build a model in TargetLink.

If the user knows what blocks to use from the beginning then the implementation

of any control model can be done. Almost all TargetLink blocks have overflow

protection available. There are two separate alternatives for overflow protection,

one for the maximum value and one for the minimum value. The user can choose

protection against upper overflow, lower underflow or both. Figure 6 shows an

example of a Gain block and how overflow protection can be chosen easily.

Figure 6: TargetLink Gain block dialog

TargetLink provides the user with Addfile block that makes it possible to add

custom code to the generated code. Another block called Custom Code can also

be used for this purpose. This block uses S-function when simulating the model in

Simulink and in the generated code added in the Custom Code block is used

instead of the S-function in the model. All TargetLink blocks and Simulink

supported blocks are listed in Appendix II.

6.2.2 Real-Time Workshop Embedded Coder

Real-Time Workshop Embedded Coder supports all Simulink blocks except

Matlab Fcn and M-file and Fortran S-function which are not inlined with TLC,

Target Language Compiler [4]. Some blocks have restrictions, for example some

blocks cannot be used inside a triggered subsystem hierarchy as a triggered

subsystem can not include blocks that are dependant on a sample time since the

trigger makes it non-sample time based. On the other hand not all Simulink blocks

support fixed-point implementation and that should be taken into consideration.

Appendix III shows the fixed-point blocks that are supported by Simulink and

code generation tool [5].

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MATLAB REAL-TIME WORKSHOP EMBEDDED CODER - S Bedienungsanleitung Seite 34