MATLAB: Fixed-step or Variable-step when designing with HDL coder

HDL Codersimulink

Can you use "Variable-step" with solver still set at discrete (no continuous states), or does the design have to be in fixed-step in your model configuration parameters settings when you are designing for HDL Coder? I initially thought that it should always be only fixed point, hence people also use fixed point designer, but then one also come across Simulink examples which uses Variable-step and also to demonstrate HDL coder. So I'm confused now. Hope someone can shine some light on this for me please. Thanks

Fixed-step or Variable-step when designing with HDL coder

Best Answer

You can use variable-step discrete with no continuous states, but I don't think there is much benefit to doing so.

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MATLAB: Turn variable-step solution into fixed-step

The ODE solvers are adaptive, but if you want all the results to have the same row length, you can specify the ‘tspan’ argument to have a specific length. The ODE solvers will output the closest results to the desired ‘tspan’ values that it estimates. You will not need to interpolate the results:

t0 = ...;                               % Start Time
tf = ...;                               % End Time
N  = ...;                               % Number Of Time Values (Row Length Of Results)
tspan = linspace(t0, tf, N);
ic = [...];                             % Initial Conditions Vector
[t,y] = ode45(@odefun, tspan, ic);

You can use the same construction to integrate all your ODE functions.

MATLAB: Does the PowerGui Block, in case of choosing the continuous solver method, solely use a variable-step Simulink solver even if the configuration for the global simulink solver is a fixed-step type

Hi Christian,

From the link below, it is recommended that you implement fixed-step solvers by continuing to use a global variable-step solver and switching the physical networks within your model to local fixed-step solvers through each network.

https://www.mathworks.com/help/physmod/simscape/ug/making-optimal-solver-choices-for-physical-simulation.html

Best Answer

Related Solutions

MATLAB: Turn variable-step solution into fixed-step

MATLAB: Does the PowerGui Block, in case of choosing the continuous solver method, solely use a variable-step Simulink solver even if the configuration for the global simulink solver is a fixed-step type

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