Stateflow

Stateflow Hierarchy of Objects

The Stateflow hierarchy of objects enables you to organize complex Stateflow diagrams by defining a parent and child object containment structure. A hierarchical design usually reduces the number of transitions and produces neat, manageable diagrams. Stateflow supports a hierarchical organization of both charts and states. Charts can exist within charts. A chart that exists in another chart is known as a subchart.

Similarly, states can exist within other states. Stateflow represents state hierarchy with superstates and substates. For example, this Stateflow diagram has a superstate that contains two substates.

The engaged superstate contains the first and second substates. The engaged superstate is the parent in the hierarchy to the states first and second. When the event clutch_engaged occurs, the system transitions out of the neutral state to the engaged superstate. Transitions within the engaged superstate are intentionally omitted from this example for simplicity.

A transition out of a higher level, or superstate, also implies transitions out of any active substates of the superstate. Transitions can cross superstate boundaries to specify a substate destination. If a substate is made active its parent superstate is also made active.

Connective Junctions

Exploring a Real-World Stateflow Application