MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Guide de l'utilisateur télécharger pdf (Page 161)

100

101

Using BlockIOSignals to Obtain Block Outputs

5-9

Below is an excerpt from an example routine that collects signals taken from

the main simulation loop:

/*******************************************

* Step the model for the base sample time *

*******************************************/

MdlOutputs(FIRST_TID);

#ifdef MAT_FILE

if (rt_UpdateTXYLogVars(S) != NULL) {

fprintf(stderr,"rt_UpdateTXYLogVars() failed\n");

return(1);

}

#endif

#ifdef STETHOSCOPE

ScopeCollectSignals(0);

#endif

MdlUpdate(FIRST_TID);

The Real-Time Workshop provides a mechanism that allows your application

program to monitor block outputs during program execution.

All block output data is written to the

SimStruct at each step through the

model code. However, to access the output of any given block in the

SimStruct,

you must know the index into the

BlockIO vector where the data is stored, as

well as how many output ports the block has and the width of each output. All

of this information is contained in the

ModelBlockInfo data structure.

The

ModelBlockInfo data structure is created by the generated code only if you

define the flag

USE_MDLBLOCKINFO when you build your program. Otherwise,

ModelBlockInfo is not created.

Note that, depending on the size of your model,

ModelBlockInfo can consume

a considerable amount of memory.

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