1 files changed, 62 insertions, 0 deletions
diff --git a/src/device/main.ino b/src/device/main.ino
new file mode 100644
index 0000000..b028d17
--- /dev/null
+++ b/src/device/main.ino
@@ -0,0 +1,62 @@
+/*
+ * Usurpation – wearable device main logic
+ *
+ * Copyright (C) 2019 Gediminas Jakutis
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; version 2.1
+ * 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#include <stdlib.h>
+
+static const unsigned int internal_led = 2;
+
+unsigned int toggleled(void);
+
+void setup(void)
+{
+	pinMode(internal_led, OUTPUT);
+
+	/* don't set pin mode here, it will get toggled at the very start of
+	 * the logic loop, either way.
+	 */
+}
+
+/* the logic is a placeholder right now */
+void loop(void)
+{
+	/* sleep length to use */
+	static unsigned int delta = 100;
+
+	/* progresivelly grow the time delta while changing state*/
+	delta += delta >> (6 + toggleled());
+
+	/* sleep */
+	delay(delta);
+}
+
+/* toggle the bult-in led and return current state */
+unsigned int toggleled(void)
+{
+	static unsigned int state = 0;
+
+	state = !state;
+	/* as the cathode of the builtin diode is connected to the MCU's pin,
+	 * while the anode is connected to Vcc, to turn it off, we need to set
+	 * the pin to HIGH.
+	 */
+	digitalWrite(internal_led, state ? LOW : HIGH);
+
+	return state;
+}