FSM Lecture 18- Exercise-003 Implementing STAT state

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Exercise-003 Implementing STAT state

 

 

In this article, let’s implement the STAT state.

The requirement is when the application is in IDLE mode, pressing the START/PAUSE button should show the STAT for 1 sec and auto return to the IDLE mode.

When the application is in IDLE mode, pressing the START_PAUSE button should show the STAT. That’s why we have to define one Transition from IDLE to STAT, as shown in Figure 1.

We call it START_PAUSE. No guard, no action. When the STAT state is entered, it shows the productive time, and it also sends one message, and then it should auto return after 1 second to IDLE mode.

Figure 1. Transition from IDLE to STAT

 

Let’s assume our application is in a STAT state. The STAT state doesn’t care for increment time event, decrement time event, it doesn’t care for START_PAUSE event, it also doesn’t care for Abort event. It displays something and then auto return after 1 second.  

Figure 2. Transition from STAT to IDLE
Figure 2. Transition from STAT to IDLE

 

Let’s put one more Transition from STAT to IDLE (Figure 2). We call it a TIME_TICK event. Guard is events ‘ss’ parameter should be = 10 [e->ss == 10]. When this event happens, and if (ss=10), then that is an auto return to the IDLE mode. 

We have completed the state machine diagram for our application.

 

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