S-function sampling time, is it possible to use several sampling time ?

Question

George 2012-8-21

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https://ww2.mathworks.cn/matlabcentral/answers/46420-s-function-sampling-time-is-it-possible-to-use-several-sampling-time

Hi all,

I'm working with a C S-function. I want to call two different function at fixe frequenties. One every 125.06 µs and one at 250µs.

I have tried setting several sampling times :

    ssSetSampleTime(S, 0, CONTINUOUS_SAMPLE_TIME);
    ssSetOffsetTime(S, 0, 0.0);
    ssSetSampleTime(S, 1 , 0.00012506 );
    ssSetOffsetTime(S, 1 , 0.0);
    ssSetSampleTime(S, 2 , 0.000250);
    ssSetOffsetTime(S, 2 , 0.0);

And to call the functions I've been using:

    if (ssIsSampleHit(S , 1, tid ))
        function1()
    if (ssIsSampleHit(S , 2, tid ))
        function2()

But this does work at all, has someone got any idea how I can do ? The ssIsSampleHit doesn't seen to detect the right times.

Thank you,

George

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Answer 1

Kaustubha Govind 2012-8-29

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https://ww2.mathworks.cn/matlabcentral/answers/46420-s-function-sampling-time-is-it-possible-to-use-several-sampling-time#answer_57385

在 MATLAB Online 中打开

I don't have much experience with multi-rate S-functions, but I thought I would recommend that you look at the demo sfcndemo_sfun_multirate.mdl. Just type the model name at the MATLAB prompt to open it up:

>> sfcndemo_sfun_multirate

Hopefully the example will give you some tips about how to use ssIsSampleHit.