How to set the output port type in dependence on an parameter - S Function

Question

Valmir Sadiku 2013-5-10

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/75315-how-to-set-the-output-port-type-in-dependence-on-an-parameter-s-function

Hello,

i'm trying to write an S-Function which allows to set the output port type dependence on one of the parameter? What i already tried:

static void mdlOutputs(SimStruct *S, int_T tid)
{
DTypeId y0DataType = ssGetSFcnParam(S,2);
    switch(y0DataType)
    {
        case SS_INT8:
        {
         int8_T            *pY0 = (int8_T *)ssGetOutputPortSignal(S,0);    
         pY0[0] = 0;
         break;
        }
        case SS_UINT8:
        {
         uint8_T            *pY0 = (uint8_T *)ssGetOutputPortSignal(S,0);     
         pY0[0] = 13;
         break;
        } 
        default:
        {
         uint8_T            *pY0 = (uint8_T *)ssGetOutputPortSignal(S,0);     
         pY0[0] = 7;  
        }
    }
}

I can compile it and run the corresponding simulink model, but it doesn't work. Can me tell anyone why?

Regards V.Sadiku

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Valmir Sadiku 2013-5-10

Simulink sets the output port type to 'double' and the attached display shows a strange value -> 3.953e-323). The parameter in the mask are set to"uint8", so i expected that simulink will set this one as output type. Maybe i have to do it another way, but i'm at a loss with this Problem.

Valmir Sadiku 2013-5-10

编辑：Valmir Sadiku 2013-5-10

在 MATLAB Online 中打开

If i try to do this in this way:

static void mdlInitializeSizes(SimStruct *S)
{
......
...
ssSetOutputPortDataType(S, 0, ssGetSFcnParam(S,2));
 ....
}

After recompiling it works without any error message, but if i run that corresponding simulink model it will give the following error in the Matlab command window:

Attempt to use invalid data type id -5373248

And the Simulink model freezes, and i have to restart matlab.

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Answer 1

William James 2013-6-3

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/75315-how-to-set-the-output-port-type-in-dependence-on-an-parameter-s-function#answer_87489

在 MATLAB Online 中打开

hello,

 i met the problem as you ! if you resolved it ,please tell me how to set the output type .

thank you with Hz

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Kaustubha Govind 2013-6-3

Do you validate the value entered for the parameter is a valid datatype ID before configuring it as the output datatype in mdlInitializeSizes?

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