Hi Anup,
I think that the exact behavior you are looking for may be limited to the Embedded Coder product.
For Simulink Coder, here is what you can do.
- Go to the Configuration Parameters for the the model
- Go to the Code Generation pane
- Change the Language option to "C++"
- Go the the Code Generation > Interface pane
- Make sure Code Interface > Code interface packaging is set to "C++ class"
Now if you generate code you should see that you have a class with a private member modelname_P. You could create as many instances of the model as you wanted, and there would be no interaction between them. Using this member you could modify the parameters inside of it (such as the value for a Gain block, or the value of a constant block), if it was not private.
Having Embedded Coder and using the Embedded Coder System Target File "ert.tlc" allows you to modify that property to be public, and edit it exactly as you have mentioned.
You could use storage classes as you mentioned to make the parameters accessible, but they would turn into global variables that would be used by multiple instances of the model, meaning you could not make the models independent.
I suppose if everything was guaranteed to be single-threaded, you could make the parameters global and change their values before interacting with each model, but this would be fragile. For example, if you had a gain G that you wanted to update and made global, and had different values for different models (G1, G2, and so on) you could do:
G = G1
Initialize model 1
G = G2
Initialize model 2
while(1)
G = G1
model 1 step
G = G2
model 2 step
end
It is not a very good solution though. Really, the way to go is with Embedded Coder.
