Motorola DSP Developer's Kit

Input Objects

Pointers to MOTDSP_Input objects only are declared outside the try block of the mdlOutputs function.

For example,

MOTDSP_Input* a = PTR_NIL;
MOTDSP_Input* b = PTR_NIL;

Before creating MOTDSP_Input objects declare InputPtrsType pointers to all possible input ports using the specific Simulink 'ss' macros.

For example, for input Port 1 use

InputPtrsType uPtrs1 = ssGetInputPortSignalPtrs(S,0); 

and, for input Port 2

InputPtrsType uPtrs2 = ssGetInputPortSignalPtrs(S,1); 

Note    Reference the ith element of the input port signal array with, for example, *uPtrs1[i].

Also, you must declare a pointer to an mxArray for each possible input port.

mxArray *array_ptr1;
mxArray *array_ptr2;

Then use the support functions MOTDSP_CreateComplexMatrix or MOTDSP_CreateRealMatrix to create a valid matrix after checking its type:

//Determine whether the port is complex.
const boolean_T c0 = 
   (boolean_T)(ssGetInputPortComplexSignal(S,0) == COMPLEX_YES);
//Then create the correct matrix:
if (!c0) {
    /* If the matrix is Real...
       Use the MOTDSP_ function to create 
       the appropriate matrix..*/
    MOTDSP_CreateRealMatrix(&array_ptr1, 
                        (double *)*uPtrs1, 
                        width);
    }

Remember to clear the memory created for each mxArray by calling the mxDestroyArray function.

Finally, create a pointer to right hand side (prhs) MEX equivalent variable before mapping the input ports to variables. For example,

    const mxArray *prhs [] = {array_ptr1, array_ptr2};
    CREATE_INPUT_ARG(a,0);
    CREATE_INPUT_ARG(b,1);

Information about the variables is accessed by the supplied methods as described previously in MATLAB MEX-Files.

Simulink S-Function MEX-Files

Output Objects