ssGetBusElementDataType

Get the data type identifier for a bus element

Syntax

int_T ssGetBusElementDataType(SimStruct* S, int_T busTypeID, int_T elemIdx)

Arguments

S

SimStruct that represents an S-Function block

busTypeID

The bus data type identifier that represents the bus signal

elemIdx

The zero-based bus element index

Returns

int_T

Description

Use to get the data type identifier for a specific bus element in a bus signal. Use the data type identifier to determine useful aspects of the bus element, including the number of elements (if this bus element is itself a bus signal) or the size of the data (ssGetDataTypeSize).

Bus S-function Usage Guidelines

Use this S-function in simulations. You cannot use this S-function for code generation.

This S-function does not support bus elements that have any of the following characteristics:

  • Variable dimensions

  • Frames

  • Enumerated (enum) data types

To use this S-function and other bus-related S-functions, before you run the simulation, execute the following MATLAB® command:

set_param(block_handle, 'EnableBusSupport', 'on')

To automate setting the EnableBusSupport parameter, use one of the following approaches:

  • Add the command to the model initialization callback.

  • Mask the S-Function block and add the command to the mask initialization callback

Languages

C, C++

Example

static void mdlOutputs(SimStruct *S, int_T tid)
 {
    DTypeId    dType    = ssGetOutputPortDataType(S, 0);
    const void *u       = ssGetInputPortSignal(S, 0);
    int        numElems = ssGetNumBusElements(S, dType);
    int        i;
    
    for(i=0; i<numElems i++) {
        int_T elemType = ssGetBusElementDataType(S, dType, i);
 
      if (elemType == SS_DOUBLE) {
            /* Process signal here */
        } else {
            ...  
        }
     }
  }

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