Linking BLAS to Simulink S-Function.

Hello everyone,

I am currently trying to link the BLAS library to a Simulink S-Function.

If I understood MathWorks documentation, Matlab already has the Blas (and Lapack) library in its folder in matroot\extern\lib\win64\microsoft. I developed an example, implementing an FIR filter, whose coefficients are the S-Function Block parameter. To generate and build the S-Function and TLC file, I used the S-Function Builder block. I specified libmwblas.lib as additional library, and blas.h as additional header. In the mdlOutputs function in make use of the ddot blas function.

Here is the generated Outputs_wrapper function

void sfcn_FIR_BLAS_Outputs_wrapper(const real_T *u0,
      real_T *y0,
      void **pW,
      const int16_T *filterOrder, const int_T p_width0,
      const real_T *coefficients, const int_T p_width1)
{
/* %%%-SFUNWIZ_wrapper_Outputs_Changes_BEGIN --- EDIT HERE TO _END */
mwSignedIndex one = 1;
double *prevIn = (double *)pW[0];
memmove(prevIn + 1, prevIn, sizeof(double)*filterOrder[0]);
memcpy(prevIn, u0, sizeof(double));
y0[0] = ddot(filterOrder, prevIn, &one, coefficients, &one);
/* %%%-SFUNWIZ_wrapper_Outputs_Changes_END --- EDIT HERE TO _BEGIN */
}

The S-Function builds without any error at this point. Then it gets weird, when running the model, sometimes, Matlab crashes. I'd say 1 out of 3 Run makes Matlab crash. The rest of the time, the output of the block is totally correct. Do you have any idea where this problem come from ? And how can I solve it ?

This model is then ment to be executed on a target PC on Simulink Real-Time. So I tried to built an executable for the model and run it in external mode. The executable gets built, but when trying to lauch it, windows throws an error : "libmwblas.dll". I can't figure out why, as I already have the static library "libmwblas.lib" in matlab installation path.

Do you have any idea how to solve this other issue ? (Maybe the two are linked).

Thanks,

Igor