Non-uniform sampling time to read data from Arduino Due in Simulink

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Yousof 2015-7-1

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https://ww2.mathworks.cn/matlabcentral/answers/226278-non-uniform-sampling-time-to-read-data-from-arduino-due-in-simulink

评论： Camila Schuck 2018-3-12

Hello

I wrote an S function (Builder) to read data from one of analog inputs of Arduino Due. I know the signal on that pin is sinusoidal with frequency of 20Hz. When I read data in Simulink in realtime with scope block and To-workspace block, the data I am receiving, does not have uniform sampling time. It seems it sends packages of 3 sampled data (with different of 0.001 second in time = my settings in solver). And it waits for some time (around 0.1 second) and then again send another package of 3 sampled data with right sampling rate of 0.001.

I use the fixed-step size solver with the step size of 0.001 in simulink.

What is the reason of it and how can I remove that undesirable 0.1 waiting time?

Thanks in Advance.

Yousof