From 9d3573134462335051e46b990e97e1d32bef4b29 Mon Sep 17 00:00:00 2001 From: Nicolas Schodet Date: Mon, 31 Mar 2008 13:03:47 +0200 Subject: * digital/io/src: - adapted FSM to AVR program. --- digital/io/src/fsm.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 digital/io/src/fsm.c (limited to 'digital/io/src/fsm.c') diff --git a/digital/io/src/fsm.c b/digital/io/src/fsm.c new file mode 100644 index 00000000..c19dd458 --- /dev/null +++ b/digital/io/src/fsm.c @@ -0,0 +1,60 @@ +/* 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" + +/** Reset a FSM. */ +void +fsm_init (fsm_t *fsm) +{ + assert (fsm); + fsm->state_current = fsm->state_init; +} + +/** Handle an event on the given FSM. */ +void +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); + fsm->state_current = br & 0xff; +#else + fsm->state_current = br; +#endif + } +} + -- cgit v1.2.3