MATLAB REAL-TIME WORKSHOP EMBEDDED CODER - S Manuale Utente Scaricare il pdf (Pagina 32)

Data Dictionary Object Description

Variable

Defines the properties of a variable in

the C code. All kinds of variables are

supported: plain variables, pointers,

macros, structs and bitfields. Relevant

variable properties are Type, Class,

Scaling, Value, Min, Max. Further

properties exist to describe how a

variable can be accessed in a

calibration system, for example,

ByteOrder, Deposit, Format and

MaxRefreshRate. The latter mentioned

properties were not tested in this work.

Typedef

Defines a C data type, including

pointers, structs and bitfields. The user

can create user-defined types. Each

typedef is mapped to one of TargetLink

basetypes like Bool, Int8, or Int16. If

needed, the user can also associate a

typedef with certain constraints, e.g., a

scaling data object or min/max values.

Scaling

Describes how to convert the fixed-

point representation of a variable in the

ECU memory into the corresponding

physical value.

Table 4: TargetLink Data Dictionary object types

Another useful tool is the Property Manager. It is a graphical user interface that

displays the properties of TargetLink blocks in the model. The Property Manager

allows the user to view and modify several blocks properties simultaneously.

To make the model easier to follow, the blocks properties are preferred to be

visible in the model. Properties like data type, offset and scaling are practical

information to have visible in the model to make it easier for the user to see, for

example, if scaling mismatch occurs. TargetLink makes this possible but only

during the use of the automatic scaling tool. The information disappears as soon

as the automatic scaling tool is closed. According to dSPACE a script can be

written that will make the desired information visible constantly

To have default block properties is not fully supported by TargetLink. The only

default property that TargetLink blocks can have is the data type e.g. Int16, Int32

or Bool

Jonas Cornelsen from Fengco.

Has not been tested in this work but Jonas Cornelsen from Fengco has confirmed it.

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