MATLAB REAL-TIME WORKSHOP EMBEDDED CODER - S Bedienungsanleitung PDF herunterladen (Seite 41)

Another issue that was a problem in both TargetLink and Real-Time Workshop

Embedded Coder was the definition of the base data types. Depending on the

target microprocessor every base data type is defined differently, e.g. integers are

defined as int or short depending on the type of the microprocessor used in the

target. Haldex Traction has its own defined base types. A specific code is

developed for the purpose of defining data base types depending on whether the

code is running in the PC or on the target.

In TargetLink the base data types are defined in a header file and the user can

rename them easily. All base data types in TargetLink were renamed so that they

match those of Haldex Traction. TargetLink declaration of those data types were

manually removed from the generated code and instead Haldex Traction base data

type declarations were used.

Real-Time Workshop Embedded Coder works in the same way as TargetLink.

The user can rename the base data types that are declared in a header file that can

be modified in the same way described above. The user can also choose to

generate code for a specific microprocessor and thus the right declaration of all

base data types is achieved. This option is available in TargetLink too but it does

not change the declaration of the base data types as required. However the user

can change the declaration for all base data types manually in the TargetLink base

files and in that way the base data types will be declared as desired. This need to

be done only once and the changes made will be applicable every time code is

generated.

One of the problems that were faced with RTW EC was choosing the right option

in some blocks to obtain the desired simulation results. The simulation gave a

graph with a lot of variations in the signal due to sampling. A small change in the

properties of the blocks of multiplications, divisions and look-up tables gave the

expected result, which was a smooth graph that followed the set points. By simply

choosing to round to simplest, see Figure 11, the whole result changed and a

smooth graph was obtained. This option also saves 30-40 rows of code for every

block.

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MATLAB REAL-TIME WORKSHOP EMBEDDED CODER - S Bedienungsanleitung Seite 41