MATLAB: Does the Stateflow Coder generate wrong code when the “Seperate arguments for input/out data” option is selected in Stateflow

Question

Why does the Stateflow Coder generate wrong code when the "Seperate arguments for input/out data" option is selected in Stateflow 4.1 (R12.1)?

If I select the "Seperate arguments for input/out data" option in Stateflow 4.1 (R12.1), Stateflow Coder will make the following chart.c function:

 void chart(void)
 {
   {
     /* During: Chart */
     if(chartInstance.State.is_active_chart == 0) {
       /* Entry: Chart */
       chartInstance.State.is_active_chart = 1;
       /* Entry: a */
       chartInstance.State.is_chart = IN_c1_s1_a;
       out = in;
     }
   }
 }

Now when I generate code on Stateflow 4.0, 4.0.1 or 4.0.2 (R12) with the following options:

 * Uncheck the 'Pack input/output data into structures' option
 * Uncheck the 'Use global input/output data (no packing)' option
(This is the same as the "Seperate arguments for input/out data" option in Stateflow 4.1).

Stateflow Coder will make the following code:

 void chart(real_T in,real_T *sf_out_Ptr)
 {
   if(chartInstance.State.is_active_chart==0) {
     chartInstance.State.is_active_chart=1;
     chartInstance.State.is_chart=IN_c1_s1_a;
     out = in;
   }
 }

The generated code from Stateflow 4.1 (or 4.0.3 and 4.0.4) is not correct because the chart function has a "void" argument.

Answer 1

This is a bug in Stateflow 4.0.3 (R12+) and beyond. This will be fixed in a future version of Stateflow.

Currently, there are no known workarounds.