MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guide de l'utilisateur télécharger pdf (Page 98)

3 Writing S-Functions As C-MEX files

3-54

The parameter can also be a variable as in

modules = 'sfun_module1 sfun_module2'

set_param(sfun_block,'SFunctionModules','modules')

or a string to be evaluated (this is needed when the modules are valid

identifiers):

set_param(sfun_block,'SFunctionModules','''sfun_module1 sfun_module2''')

S-Function RTWdata for Generating Code with RTW

There is a property of blocks called RTWdata, which can be used by the Target

Language Compiler when inlining an S-function.

RTWdata is a s tru ctu re of

strings that yo u can at tach to a block. It is s av ed wit h the mod e l and placed in

the

model.rtw file when generating code. For example, this set of MATLAB

commands,

mydata.field1 = 'information for field1';

mydata.field2 = 'information for field2';

set_param(gcb,'RTWdata',mydata)

get_param(gcb,'RTWdata')

produces this result:

ans =

field1: 'information for field1'

field2: 'information for field2'

Inside the model.rtw for the associated S-function block is this information:

Block {

Type "S-Function"

RTWdata {

field1 "information for field1"

field2 "information for field2"

}

mdlRTW

The mdlRTW routine can help you inline (embed) your S-function in the

generated code. Inlining means to embed in your code in Real-Time Workshop

generated code. Typically, this is done for performance reasons. You may also

be required to inline your S-function if you have an

mdlProcessParameters

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guide de l'utilisateur Page 98