Simulink C-caller with persistent fcn

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Jack Daniels
Jack Daniels 2024-10-30
回答： David Balbuena 2024-11-6
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.

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回答（2 个）

Shantanu Dixit
Shantanu Dixit 2024-11-1
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!
David Balbuena
David Balbuena 2024-11-6
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

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