Add tip compensation support

workspace/TS100/inc/main.hpp

@@ -6,5 +6,20 @@
 
 extern OLED lcd;
 extern MMA8652FC accel;
+enum ButtonState {
+	BUTTON_NONE = 0, /* No buttons pressed / < filter time*/
+	BUTTON_F_SHORT = 1, /* User has pressed the front button*/
+	BUTTON_B_SHORT = 2, /* User has pressed the back  button*/
+	BUTTON_F_LONG = 4, /* User is  holding the front button*/
+	BUTTON_B_LONG = 8, /* User is  holding the back button*/
+	BUTTON_BOTH = 16, /* User has pressed both buttons*/
+
+/*
+ * Note:
+ * Pressed means press + release, we trigger on a full \__/ pulse
+ * holding means it has gone low, and been low for longer than filter time
+ */
+};
+ButtonState getButtonState();
 
 #endif /* __MAIN_H */