irq-driven fast button code

ProffieOS.ino

@@ -684,6 +684,7 @@ V3TestScript script;
 #endif
 #include "buttons/rotary.h"
 #include "buttons/pots.h"
+#include "buttons/fast_button.h"
 
 #include "ir/ir.h"
 #include "ir/receiver.h"

buttons/fast_button.h

@@ -0,0 +1,35 @@
+#ifndef BUTTONS_FAST_BUTTON_H
+#define BUTTONS_FAST_BUTTON_H
+
+// Like a button, but can respond to very short events.
+// No de-bouncing, only generates EVENT_CLICK_SHORT
+template<int PIN>
+class FastButton : public Looper {
+public:
+  USE_PIN_INPUT(PIN, FastButton<PIN>);
+
+  FastButton(const char* name, enum BUTTON button) : name_(name), button_(button) {
+    pinMode(PIN, INPUT_PULLUP);
+    attachInterrupt(PIN, &FastButton::irq, FALLING);
+  }
+
+  const char* name() override { return name_; }
+
+  void Loop() override {
+    if (pressed) {
+      pressed = false;
+      prop.Event(button_, EVENT_CLICK_SHORT);
+    }
+  }
+
+private:
+  static void irq() { pressed = true; }
+
+  static volatile bool pressed;
+  const char* name_;
+  enum BUTTON button_;
+};
+
+template<int PIN> volatile bool FastButton<PIN>::pressed = false;
+
+#endif