Call mex function in simulink/ s-function ?

Hello,

I have a SBG system (inertial navigation system) that we can not use with Matlab.

I created a mexw64 file that allows me to acquire the data of the sbg in real time. To do this I call the Function: [id, temps, ekf, imu, gyro, temp]=ellipseClientSMMatlab in Matlab, tell now everything is working.

I want to use those streaming data id, temps, ekf, imu, gyro, temp in Simulink, how can I do that? I tried to use S_Function Builder, in the Library I put my mex file: ellipseClientSMMatlab.mexw64, and I put in the outputs id, temps, ekf, imu, gyro, temp. I build, No error and I have three files, ellipseClientSMMatla.c, ellipseClientSMMatla_wrapper.c, ellipseClientSMMatlab.tlc.

I excute that in Simulink, but nothing in the outputs id, temps, ekf, imu, gyro, temp. In Matlab when I try to call my function, [id, temps, ekf, imu, gyro, temp]=ellipseClientSMMatlab. It gives me error. “MEX level2 S-function "ellipseClientSMMatlab" must be called with at least 4 right hand arguments”

Can someone help ? thank you so much PS : Sorry for my english dont write well.

Answer 1

[Nick Sarnie]

Hi Hocine,

It sounds like you used MATLAB Coder to generate a MEX for the MATLAB Function. If you want to use it in an S-Function, I recommend creating a DLL with MATLAB Coder instead. To do this, you can use the "-config:dll" option to the "codegen" command. Lets use an example MATLAB function named 'dlldemo', which takes two double input arguments:

>> codegen -config:dll dlldemo.m -args {1,2}

From here, you can go into the codegen/dll/dlldemo folder and copy the dlldemo.lib and dlldemo.dll file to your Simulink model directory.

Finally, add 'dlldemo.lib' and 'dlldemo.dll' to the Library tab of S-Function Builder under 'Library/Object/Source files', and call 'dlldemo' in the S-Function code.

[yakoubi Hocine]

Hi Nick,

thank you for your answer. I dont have the (.m) file, I have a (ellipseClientSMMatlab.mexw64) file and some (.dll) I tried Matlab Function but (.mexw64) file not supported by simulink. So how can I use my (.mexw64) file in simulink ?

Thank you again

[yakoubi Hocine]

Hi Nick, Thank you again for your help.

I have the solution for my proble.

I used Matlab Function Block and coder.extrinsic('ellipseClientSMMatlab') to resolve the problem.

This is the all program :

function [id, ekf,temps,imu, gyro, temp]=sbg
id=[0];
temps=[0];
ekf=[0,0,0];
imu=[0,0,0];
gyro=[0,0,0];
temp=[0];
coder.extrinsic('ellipseClientSMMatlab');
[id, temps, ekf, imu, gyro, temp]=ellipseClientSMMatlab;
end

It's working. Thank you

[Pierre LEPERCQ]

Hey Hocine!

I have a problem to get data from my SBG captor in Simulink. It looks like you found a solution to get them in real time... Can you tell me how have you done to create your ellipseClientSMMatlab.mexw64 and what you wrote in?

It would hep me a lot

Thanks!

PS : Sorry for my english, is not well too ^^'