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+/* switch.c */
+/* io - Input & Output with Artificial Intelligence (ai) support on AVR. {{{
+ *
+ * Copyright (C) 2008 Dufour Jérémy
+ *
+ * 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 "switch.h"
+
+#include "common.h"
+#include "modules/utils/utils.h" /* set_bit */
+#include "io.h" /* PORT/PIN, bit_is_set */
+
+/**
+ * @defgroup SwitchConfiguration Configuration of the switch module.
+ * You can change the value of the defines and variables of this group to
+ * configure the module.
+ */
+
+/**
+ * Color selector switch port.
+ */
+#define SWITCH_COLOR_PORT PORTC
+
+/**
+ * Color selector read register port.
+ */
+#define SWITCH_COLOR_PIN PINC
+
+/**
+ * Color selector switch pin number of the port.
+ */
+#define SWITCH_COLOR_PIN_NUMBER 0
+
+/**
+ * Jack switch port.
+ */
+#define SWITCH_JACK_PORT PORTC
+
+/**
+ * Jack switch read register port.
+ */
+#define SWITCH_JACK_PIN PINC
+
+/**
+ * Jack switch pin number of the port.
+ */
+#define SWITCH_JACK_PIN_NUMBER 1
+
+/**
+ * Number of iteration of 4.4 ms to have for the filter.
+ */
+#define SWITCH_JACK_FILTER_NUMBER 50
+
+/**
+ * Get the current state of the jack switch.
+ * @return the state of the jack without any filter.
+ */
+static inline uint8_t
+switch_get_jack_raw (void);
+
+/**
+ * The current filtered value of the jack.
+ */
+uint8_t switch_jack_filtered_value_;
+
+/** @} */
+
+/* Initialize the switch module. */
+void
+switch_init (void)
+{
+ /* By default, all pins are in input direction */
+ /* Enable the pull-ups */
+ set_bit (SWITCH_COLOR_PORT, SWITCH_COLOR_PIN_NUMBER);
+ set_bit (SWITCH_JACK_PORT, SWITCH_JACK_PIN_NUMBER);
+ /* By default, there is no jack inserted */
+ switch_jack_filtered_value_ = 1;
+}
+
+/* Update the switch module. */
+void
+switch_update (void)
+{
+ /* Filter counter */
+ static uint8_t switch_jack_filter = 0;
+
+ /* If the get return the same as the cached one */
+ if (switch_get_jack_raw () == switch_jack_filtered_value_)
+ /* Ensure filter counter is zero */
+ switch_jack_filter = 0;
+ else
+ {
+ /* Increment filter counter and compare it to the max filter */
+ if (switch_jack_filter++ == SWITCH_JACK_FILTER_NUMBER)
+ {
+ /* We change the value of the jack */
+ switch_jack_filtered_value_ = !switch_jack_filtered_value_;
+ /* Reset filter counter */
+ switch_jack_filter = 0;
+ }
+ }
+}
+
+/* Get the current state of the select colors switch. */
+enum team_color_e
+switch_get_color (void)
+{
+ return bit_is_set (SWITCH_COLOR_PIN, SWITCH_COLOR_PIN_NUMBER);
+}
+
+/* Get the current state of the jack switch. */
+static inline uint8_t
+switch_get_jack_raw (void)
+{
+ return bit_is_set (SWITCH_JACK_PIN, SWITCH_JACK_PIN_NUMBER);
+}
+
+/* Get the value of the jack with filtering. */
+uint8_t
+switch_get_jack (void)
+{
+ return switch_jack_filtered_value_;
+}
+