How to convert const real_T value to double ?

Hi, I have a problem with a piece of my code:

    static void mdlOutputs(SimStruct *S, int_T tid)
    {  
    #ifndef MATLAB_MEX_FILE
    InputRealPtrsType uPtrs = ssGetInputPortRealSignalPtrs(S,0); 
    ds1104_slave_dsp_pwm_duty_write_register(task_id, &ch1_index, 1);
  
    if (*uPtrs < 1.0)
  ds1104_slave_dsp_pwm_duty_write(task_id, ch1_index, 0.0);
    else
  ds1104_slave_dsp_pwm_duty_write(task_id, ch1_index, 1.0);  
    #endif
    }

It doesn't work because of incompatible operand types ("const real_T *" and "double") here : " *uPtrs < 1.0 "

I don't know how to correct it, your help will be welcome.

Thanks

Answer 1

[Titus Edelhofer]

Hi,

the function ssGetInputPortRealSignalPtrs allows Simulink to have the inputs organized in chunks. That's good for optimization (and for large input arrays) but is more difficult for the user. My suggestion would be to use the simpler ssGetInputPortRealSignal:

const real_T *u = ssGetInputPortRealSignal(S,0); 
if (*u < 1.0)
...

Otherwise, if you leave it as is:

if (u[0][0] < 1.0)

Titus

[Alice]

Thanks, it works with your solution.

I don't have other problems

[Kaustubha Govind]

@Titus: I fixed your code to use ssGetInputPortRealSignal (as I think you intended) instead of ssGetInputPortRealSignalPtrs. Hope you don't mind. :)

[Titus Edelhofer]

Of course that's fine, thanks! Yes, that was what I wanted to write ... ;-).