altos: Rename 'core' to 'kernel'

[fw/altos] / src / kernel / ao_debounce.h

diff --git a/src/kernel/ao_debounce.h b/src/kernel/ao_debounce.h
new file mode 100644 (file)
index 0000000..19c620f
--- /dev/null
+++ b/src/kernel/ao_debounce.h
@@ -0,0 +1,74 @@
+/*
+ * Copyright © 2013 Keith Packard <keithp@keithp.com>
+ *
+ * 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; version 2 of the License.
+ *
+ * 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.
+ */
+
+#ifndef _AO_DEBOUNCE_H_
+#define _AO_DEBOUNCE_H_
+
+struct ao_debounce {
+       struct ao_debounce      *next;
+
+       /* time that pin value must be stable before accepting */
+       uint8_t                 hold;
+
+       /* last value reported to app; don't report it twice */
+       uint8_t                 value;
+
+       /* current value received from pins */
+       uint8_t                 current;
+
+       /* current count of intervals pin value has been stable */
+       uint8_t                 count;
+
+       /* This pin is running */
+       uint8_t                 running;
+
+       /* Get the current pin value */
+       uint8_t                 (*_get)(struct ao_debounce *debounce);
+
+       /* The stable value has changed */
+       void                    (*_set)(struct ao_debounce *debounce, uint8_t value);
+};
+
+static inline void
+ao_debounce_config(struct ao_debounce *debounce,
+                  uint8_t (*_get)(struct ao_debounce *debounce),
+                  void (*_set)(struct ao_debounce *debounce, uint8_t value),
+                  uint8_t hold)
+{
+       debounce->next = 0;
+       debounce->hold = hold;
+       debounce->value = 0xff;
+       debounce->current = 0xff;
+       debounce->count = 0;
+       debounce->running = 0;
+       debounce->_get = _get;
+       debounce->_set = _set;
+}
+
+void
+_ao_debounce_start(struct ao_debounce *debounce);
+
+void
+_ao_debounce_stop(struct ao_debounce *debounce);
+
+void
+ao_debounce_init(void);
+
+void
+ao_debounce_dump(void);
+
+#endif /* _AO_DEBOUNCE_H_ */