/* fsm.c - Finite State Machine code. */ /* io - Input & Output with Artificial Intelligence (ai) support on AVR. {{{ * * Copyright (C) 2008 Nicolas Schodet * * APBTeam: * Web: http://apbteam.org/ * Email: team AT apbteam DOT org * * 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 2 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, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * }}} */ #include "common.h" #include "fsm.h" #ifdef HOST # include #endif /** Reset a FSM. */ void fsm_init (fsm_t *fsm) { assert (fsm); fsm->state_current = fsm->state_init; } /** Handle an event on the given FSM. */ uint8_t fsm_handle_event (fsm_t *fsm, u8 event) { assert (fsm); assert (event < fsm->events_nb); /* Lookup transition. */ fsm_transition_t tr = fsm->transition_table[ fsm->state_current * fsm->events_nb + event]; /* Ignore unhandled events. */ if (tr) { /* Execute transition. */ fsm_branch_t br = tr (); /* Change state. */ #ifdef HOST assert (((br >> 16) & 0xff) == fsm->state_current); assert (((br >> 8) & 0xff) == event); printf ("%s %s =%s=> %s\n", fsm->name, fsm->states_names[fsm->state_current], fsm->events_names[event], fsm->states_names[br & 0xff]); fsm->state_current = br & 0xff; #else fsm->state_current = br; #endif return 1; } return 0; }