MATLAB REAL-TIME WORKSHOP EMBEDDED CODER - S Manuel d'utilisateur télécharger pdf (Page 17)

3.1.5 External Function Calls and S-function Support

Function calls to hardware are sometimes replaced with a subsystem in the

simulation model which will do something different during the simulation. This is

to avoid having to be connected to the hardware during the simulation and code

generation stage. In TargetLink the user can have, as mentioned earlier, a

subsystem for which separate code is generated in a separate file. The user can

specify the name of that specific file and the name of the function call. In that way

the user can replace the generated file with the original file that contains the

function call to the hardware. No changes in the generated code are then required

since the user can choose the same name and interface for the function call in

question. In that way the simulation will run smoothly and when running against

the target the user does not need to change anything in the code but only replaces

certain files. External code can be added easily to the model as well, this is done

by using a specific block to add custom code to the model or using S-functions

which are fully supported in TargetLink.

3.1.6 MISRA C, Platform Dependency and Different Microprocessors

Support

The Motor Industry Software Reliability Association, MISRA, has developed a

standard for C programming language for guidelines in safety critical systems.

TargetLink respects the majority of MISRA C rules. Deviations from MISRA C

rules are technical necessity and when they occur they are identified and well

documented [10]. For interested users there is specific documentation for

TargetLink support of MISRA C provided by TargetLink.

TargetLink generates ANSI-C code which is platform independent and can

therefore be compiled with any ANSI-C C-compiler on any platform.

TargetLink supports a list of microprocessors if the program Target Optimisation

Module, TOM, is purchased. TOM is an additional program for TargetLink Base

Suite, TBS. below is a list of the supported microprocessors in TargetLink 2.2:

Freescale HCS12

Freescale MPC5xx

Freescale MPC55xx

Infineon C16x

Infineon TriCore

Renesas M32R

Renesas SH-2

The optimised generated code is still effective ANSI C code which is platform

independent. TOM code can also be target specific, i.e. insertion of assembly code

and usage of compiler specific extensions to further improvement of code

efficiency is available if the user allows TargetLink to do so.

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MATLAB REAL-TIME WORKSHOP EMBEDDED CODER - S Manuel d'utilisateur Page 17