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+/* 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
+ }
+}
+