What is a finite state machine in C?


What is a finite state machine in C?

A finite state machine in C is one of the popular design patterns for the embedded system. A finite state machine makes the development easy and smooth. There are a lot of devices which use event base states, like coffee machine, vending machine, POS devices, door lock system, etc.

What is a state machine in C?

State machines are very simple in C if you use function pointers. Basically you need 2 arrays – one for state function pointers and one for state transition rules. Every state function returns the code, you lookup state transition table by state and return code to find the next state and then just execute it.

What is finite state machine?

Definition. A Finite State Machine is a model of computation based on a hypothetical machine made of one or more states. Only one single state of this machine can be active at the same time. It means the machine has to transition from one state to another in to perform different actions.

What is FSM in embedded system?

< Embedded Control Systems Design. Finite State Machines (FSM) and Petri Nets (PN) are conceptual models to represent the discrete interactions in a system. A FSM is a conceptual model that represents how one single activity can change its behaviour over time, reaction to internally or externally triggered events.

How is finite state machine implemented?

  1. Identify all possible states in your application.
  2. Identify all the events in your application.
  3. Identify all the conditions in your application, which may lead state transition.
  4. Occurrence of an event may cause transitions of state.
  5. Build a finite state machine by deciding a workflow of states & transitions.

What is finite state machine in VLSI?

A finite-state machine (FSM) or simply a state machine is used to design both computer programs and sequential logic circuits. It is conceived as an abstract machine that can be in one of a finite number of user-defined states.

Why are finite state machines useful?

Finite state machines are important because they allow us to explore the theory of computation. They help us discover what resources are needed to compute particular types of problem. In particular finite state machines are deeply connected with the idea of grammars and languages that follow rules.

What is Moore and Mealy machine?

A Mealy Machine changes its output on the basis of its present state and current input. A Moore Machine’s output depends only on the current state. It does not depend on the current input.