Since MEX-files are specific to the MATLAB environment, you cannot run them on an embedded target. If you have the equivalent standalone C code equivalent also, you can use the following code style to call the MEX-file during simulation, and the C-code in the generated code:
function y = myfcn(u)
coder.extrinsic('mymex');
y = 0; %pre-allocate
if coder.target('Sfun')
y = mymex(u);
else
y = coder.ceval('foo', u);
end
Please refer to the documentation for more information on coder.target and coder.ceval.
