How to create a "redundant" function with a C-MEX S-function ?

Hello, I have 1 input (a signal) and I want it to become 3 shifted phase (0, T/3 & 2T/3) signals. It Here is the part of my code :

 static void mdlOutputs(SimStruct *S, int_T tid)
 {  
  #ifndef MATLAB_MEX_FILE
  Float64 T1, T2;
  T1 = period/3;
  T2 = 2*period/3;
  
  exec_time = RTLIB_TIC_READ();
  
  const real_T *u = (const real_T*) ssGetInputPortRealSignalPtrs(S,0); 
  
  ds1104_slave_dsp_pwm_start(tid0, SLVDSP1104_PWM_CH2_MSK);
  ds1104_slave_dsp_pwm_duty_write_register(tid0, &ch1_index, 2);
  ds1104_slave_dsp_pwm_duty_write(tid0, ch1_index, *u);
  
  if (exec_time > T1)
  {  
    ds1104_slave_dsp_pwm_start(tid1, SLVDSP1104_PWM_CH3_MSK);
    ds1104_slave_dsp_pwm_duty_write_register(tid1, &ch2_index, 3);
    ds1104_slave_dsp_pwm_duty_write(tid1, ch2_index, *u);
  }
  if (exec_time > T2)
  {
    ds1104_slave_dsp_pwm_start(tid2, SLVDSP1104_PWM_CH4_MSK);
    ds1104_slave_dsp_pwm_duty_write_register(tid2, &ch3_index, 4);  
    ds1104_slave_dsp_pwm_duty_write(tid2, ch3_index, *u);
  }
  #endif  
 }

It works with the first loop, but no more. How can I do for more than 1 loop ? I know the problem come from the "if" loops but I don't know how I can replace it.

Please help me, thank you.

Answer 1

[Kaustubha Govind]

It's really hard for us to help with your code because you have library calls like RTLIB_TIC_READ() and ds1104_slave_dsp_pwm_XXX. I would recommend that you try debugging your S-function - step through your code and see if you are getting expected results from each library call. Once you have narrowed down the symptom to a Simulink-specific issue, more contributors on this forum will be able to help.

[Kaustubha Govind]

Do you mean the expressions: (exec_time > T1) and (exec_time > T2)? But exec_time is calculated from your custom library function RTLIB_TIC_READ(), and it's not clear what "period" is from your code snippet.