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Description
Allow states to have a on_state() function that will run while in that state.
Main program loop will need a call to run_machine() to resolve than on_state() calls and resolve timed transitions.
This example shows how it would work (not tested, can contain errors):
#include <Fsm.h>
/*
* FSM Library sample with user and timed
* transitions.
* Uses a button and Arduino builtin led,
* button can be replaced just grounding
* pin.
*/
// Used pins
#define LED_PIN 13
#define BUTTON_PIN 8
//Events
#define BUTTON_EVENT 0
int buttonState = 0;
/* state 1: led off
* state 2: led on
* transition from s1 to s2 when pusshing button
* transition back from s2 to s1 after 3 seconds
* SECOND PARAM IS NEW "on_state()" FUNCTION
*/
State state_led_off(&led_off, &check_button, null);
State state_led_on(&led_on, null, null);
Fsm fsm(&state_led_off);
// Transition functions
void led_off()
{
digitalWrite(LED_PIN, LOW);
}
void led_on()
{
digitalWrite(LED_PIN, HIGH);
}
void check_button()
{
buttonState = digitalRead(buttonPin);
if (buttonState == LOW) {
fsm.trigger(BUTTON_EVENT);
}
}
// standard arduino functions
void setup()
{
pinMode(LED_PIN, OUTPUT);
pinMode(BUTTON_PIN, INPUT);
fsm.add_transition(&state_led_off, &state_led_on,
BUTTON_EVENT, null);
fsm.add_timed_transition(&state_led_on, &state_led_off, 3000, NULL);
}
void loop()
{
// Call fsm run
fsm.run_machine();
}