MATLAB: Defining Matlab function datatype input in Simulink

MATLABmatlab functionsimulink

Hello,

I have a problem to compile model with following part:

function [delayed_flag, counter] = delayed_flag(flag, counter_default, counter_prev)
    if flag == true
        if counter_prev == 0
            delayed_flag = true;
            counter = uint16(0);
        else
            delayed_flag = false;
            counter = counter_prev - uint16(1);
        end
    else
        delayed_flag = false;
        counter = counter_default;
    end
    
end

The problem seems to be that the 'counter_prev' input is treated as double, and I dont know how to force it to be uint16.

(Error: Data type mismatch. Output port 1 of 'xxx/Unit Delay2' is a signal of data type 'uint16'. However, it is driving a signal of data type 'double'.)

Thank your for help,

Vlasta

Best Answer

In the MATLAB Funciton editor, click icon "Edit Data".

Or in Simulink, Ctrl+H to open Model Explorer, on the left column, navigate to the MATLAB function, find your data and specify the data type.

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The following example demonstrates how to create an uint32 matrix and copy the data from a vector data structure (requires C++) using the memcpy() function.

// Name: uint32test.cpp
// Compile: mex uint32test.cpp
// Test: uint32test
#include "mex.h"
#include <stdio.h>
#include <stdlib.h>
#include <vector>
#define printf mexPrintf
/* Output Arguments */
#defineMY_OUTplhs[0]
#define MY_SIZE10
typedef unsigned int MY_TYPE; // Define data type (should match MATLAB type, e. g. mxUINT32_CLASS).
using std::vector; // C++.
// MEX-gateway routine.
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[]) {
      vector<MY_TYPE> testVector;
      testVector.reserve(MY_SIZE);
      // Fill test vector with numbers.
      MY_TYPE tempCounter = 0; // 0 to MY_SIZE.
      for (tempCounter = 0; tempCounter < MY_SIZE; ++tempCounter) {
          testVector.push_back(tempCounter);
      }
      // Create uint32 matrix of dimensions tempCounter * 4.
      MY_OUT = mxCreateNumericMatrix((mwSize) tempCounter, (mwSize) 4, mxUINT32_CLASS, mxREAL);
      // Use memcpy to fill the matrix instead of using a loop.
      MY_TYPE * ptr_OUT = (MY_TYPE *) mxGetPr(MY_OUT);
      // Each column is filled separately, but the whole matrix could also be filled at once,
      // if the copied data has the same size as the matrix.
      memcpy(&ptr_OUT[0], &testVector[0], tempCounter * sizeof(MY_TYPE)); // Column 1.
      memcpy(&ptr_OUT[tempCounter], &testVector[0], tempCounter * sizeof(MY_TYPE)); // Column 2.
      memcpy(&ptr_OUT[2 * tempCounter], &testVector[0], tempCounter * sizeof(MY_TYPE)); // Column 3.
      memcpy(&ptr_OUT[3 * tempCounter], &testVector[0], tempCounter * sizeof(MY_TYPE)); // Column 4.
      return;
}

Best Answer

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