CODEWITHSUNDEEP
matlabsimulink
JLagana
JLagana

Reputation: 1294

Is there a way to enforce the simulation step to be smaller than a compile-time constant in simulink?

Question

Is there a way to enforce the simulation step to be smaller than a compile-time constant in a simulink model?

Context

I'm trying to build a PWM block on simulink. As it is now, I have to make sure that the user chooses a step size responsibly (smaller than half the period chosen by him), otherwise the block behaves abnormally. The only way I came up was to stop the simulation if the step size is not small enough, but I find that very annoying (as a user). If possible, I'd like for the user to not worry about this at all.

Upvotes: 0

Views: 244

Answers (1)

am304
am304

Reputation: 13876

Here's what I would do: add the following pseudo-code to the block callback StartFcn:

T_PWM = get_param(gcb,...); % get the block parameter (period) of the current PWM block (string)
T_PWM = str2double(T_PWM);
T_solver = get_param(bdroot,'FixedStep'); % get fixed used by the solver (string)
T_solver = str2double(T_solver); % convert from string to double
if T_solver > 0.5*T_PWM
   error('Solver step size must be smaller than half the PWM period')
end

Upvotes: 2

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