+void oswald_handle_accel_event(u8t x, u8t y, u8t z);
+void oswald_handle_ambientlight_event(u8t light_level);
+void oswald_handle_idle_event(void);
+void oswald_one_second_tick(void);
+void oswald_halfsecond_tick(void);
+void oswald_centisecond_tick(void);