Simulink C-caller with persistent fcn

I'd like to have a short fcn in Simulink called by C-caller

if (state>0)
    {
       state = -1;
       y = 0.1;
    } else if (state < 0)
    {
       state = 1;
       y = -0.1;
    } else
    y=0;

I need to have "state" variable as peristent, can I have a persistent variable within C-caller?

Thank you.

Answer 1

[Shantanu Dixit]

Hi Jack,

You can make the 'state' variable persistent within a C-caller block in Simulink by declaring it as 'static' in your C function. This ensures that the 'state' retains its value between calls to the function, effectively making it persistent across simulation time steps.

Hope this helps!

Answer 2

[David Balbuena]

You could use the C Function block instead. The C Function block lets you put that code directly in the block mask, and it also lets you define "state" to be a persistent symbol. This example shows how to do that: https://www.mathworks.com/help/simulink/ug/modify-states-of-a-c-function-block-using-persistent-scope.html