This rule applies to continuous-time charts because you cannot call functions during minor time steps. You can call Simulink functions in state entry or exit actions and transition actions. However, if you try to call Simulink functions in state during actions or transition conditions, an error message appears when you simulate your model.

For more information, see Modeling Continuous-Time Systems in Stateflow Charts.

If you select Execute (enter) Chart At Initialization in the Chart properties dialog box, you cannot call Simulink functions in default transitions that execute the first time that the chart awakens. Otherwise, an error message appears when you simulate your model.

This rule ensures that the names of input and output ports are compatible with identifier naming rules of Stateflow charts.

Note   Any space in a name automatically changes to an underscore.

For Simulink functions inside a Stateflow chart, the output ports do not support discontiguous signals. If your function contains a block that outputs a discontiguous signal, insert a Signal Conversion block between the discontiguous output and the output port. This action ensures that the output signal is contiguous.

Blocks that can output a discontiguous signal include the Bus Creator block and the Mux block. For the Bus Creator block, the output is discontiguous only if you clear the Output as nonvirtual bus check box—that is, if the Bus Creator block outputs a virtual bus. If you select Output as nonvirtual bus, the output signal is contiguous and no conversion is necessary.

For more information, see Bus Creator, Mux, and Signal Conversion in the Simulink Reference documentation.

If you try to export Simulink functions, an error message appears when you simulate your model. To avoid this problem, clear the Export Chart Level Graphical Functions (Make Global) check box in the Chart properties dialog box.

If you try to use the Model Explorer to rename a Simulink function, the change does not appear in the chart. Click the function box in the Stateflow Editor to rename the function.

This restriction prevents violations of Moore semantics during chart execution. See Design Rules for Moore Charts for more information.

If you try to generate HDL code for charts that contain Simulink functions, an error message appears when you simulate your model. HDL code generation does not support Simulink functions.