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/*
* fsm-states.h: State-handling functions for SpaghettiMonster.
*
* Copyright (C) 2017 Selene ToyKeeper
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef FSM_STATES_H
#define FSM_STATES_H
#include "fsm-adc.h"
// typedefs
typedef uint8_t State(Event event, uint16_t arg);
typedef State * StatePtr;
// top of the stack
volatile StatePtr current_state;
// stack for states, to allow shared utility states like "input a number"
// and such, which return to the previous state after finishing
#define STATE_STACK_SIZE 8
StatePtr state_stack[STATE_STACK_SIZE];
uint8_t state_stack_len = 0;
void _set_state(StatePtr new_state, uint16_t arg,
Event exit_event, Event enter_event);
int8_t push_state(StatePtr new_state, uint16_t arg);
StatePtr pop_state();
uint8_t set_state(StatePtr new_state, uint16_t arg);
// if loop() needs to change state, use this instead of set_state()
// (because this avoids race conditions)
volatile StatePtr deferred_state;
volatile uint16_t deferred_state_arg;
void set_state_deferred(StatePtr new_state, uint16_t arg);
#ifndef DONT_USE_DEFAULT_STATE
uint8_t default_state(Event event, uint16_t arg);
#endif
#endif
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