Code Generation: Static local variables

I would like the "Block signals" and "Block states" in the generated c-code to be of the type "static".

Example:

static BlockIO_model B;

How do I get there? thx

Answer 1

[Kaustubha Govind]

I don't think there is currently a simple solution for this (I would recommend putting in an enhancement request with MathWorks Tech Support if this is important for your use-case).

However, this is certainly possible with use of Custom Storage Classes. You can create your own storage class to declare data as "static" in the generated code. This storage class can then be applied to data in your model by the use of Simulink.Signal (or mpt.Signal) and Simulink.Parameter (or mpt.Parameter) objects that use this as their storage class. There are some usage examples in the documentation section Types, Operators, and Expressions.

[Steg]

thanks for your answert.

I'm already working with custom storage classes. It works well for signals which are linked to these storage classes.

My current problem is, that all other variables (like block outputs or states), which are generated automatically and are not related to a storage class, are of a global typ. In general, I want all variables in the code to be of a "static local" type.

Any idea how to make these "intermediate" variables of static type?

[Kaustubha Govind]

Steg: In general, you can assign custom storage classes to all signals by creating a signal object or assigning it a name (right click on signal and select "Signal Properties ..."). Regarding states - I think this is currently possible only for blocks that have the "State Attributes" tab in the dialog window like the Delay and Unit Delay block. You can select a storage class in this tab.

[Fang Li]

I come across this problem too. The Answer here does no help.

[Jean]

Hello Fang, do you manage to fix this issue?

[Sai Manga Reddy Karri]

I am trying to generate it for unit delay block..it is generated as global static.. but i am unable to generate it as local static..

[sai ganesh]

Any solution for this scenario? Even in MATLAB 2022b we are unable to generate the Block states as local static variables.

Answer 2

[Fan BU]

Please try using the block delay, the delayed signal will be one from last cycle, this corresponds to static in C code, see the picture, the signal rpmDir in generated C code will be static.

Maybe custom storage class is better solution, I never used this.