Long button press support (#1188)

firmware/application/hw/debounce.hpp

@@ -31,25 +31,39 @@
 // # of timer0 ticks before a held button starts being counted as repeated presses
 #define REPEAT_INITIAL_DELAY 250
 #define REPEAT_SUBSEQUENT_DELAY 92
+#define LONG_PRESS_DELAY 1000
 
 class Debounce {
    public:
     bool feed(const uint8_t bit);
 
     uint8_t state() const {
-        return state_;
+        return (pulse_upon_release_) ? 0 : state_;
     }
 
     void enable_repeat() {
         repeat_enabled_ = true;
     }
 
+    void set_long_press_support(bool v) {
+        long_press_enabled_ = v;
+    }
+
+    bool long_press_occurred() {
+        bool v = long_press_occurred_;
+        long_press_occurred_ = false;
+        return v;
+    }
+
    private:
     uint8_t history_{0};
     uint8_t state_{0};
     bool repeat_enabled_{0};
     uint16_t repeat_ctr_{0};
     uint16_t held_time_{0};
+    bool pulse_upon_release_{0};
+    bool long_press_enabled_{0};
+    bool long_press_occurred_{0};
 };
 
 #endif /*__DEBOUNCE_H__*/