Embedded coder simulink question: external .c and .h? create S function? use Matlab function block

Hi,

I think I am getting confused with all the products capabilities and which to use.

I would like to create a custom function in a simulink model that calculates a checksum amongst other things. Code is auto generated from the model to run on an arm microcontroller.

Preferably I would like to reuse this function across the model and maybe in futre in other models. What would be the best approach for this?

1. Integrate C Code Using the MATLAB Function Block
2. Create a wrapper around a .c file to create an S-function <not sure if this is even correct?
3. Create a Matlab function to do this (what does the generated code look like, is it ok to do this?)
4. Use simulink blocks to do this?

Thanks.

Answer 1

[Birdman]

The preference order for me is as follows:

3-4-1-2

I would first and always try to go with solve my issue with a MATLAB Function block because it is really easy to implement your algorithm in it and for Simulink, it is easy to generate C code from it. See the following links:

https://www.mathworks.com/help/simulink/ug/creating-an-example-model-that-uses-a-matlab-function-block.html

https://www.mathworks.com/help/simulink/ug/example-calculating-statistical-mean-and-standard-deviation.html

https://www.mathworks.com/help/simulink/ug/why-use-matlab-function-blocks.html

Answer 2

[Joe Holdsworth]

Birdman,

Thanks very much for your answer, what parameters define which method you would use?

[Birdman]

You are welcome, as I said, I would first try to use MATLAB Function.

Actually, to get used to the stuff and see the differences, why don't you implement something simple with Simulink blocks and MATLAB Function? A mathematical expression or else, implement something and generate code from it and see the differences and similarities.

By the way, if my answer helped, can you also accept it?