minimal boot mode to save flash space

src/Arduboy.cpp

@@ -28,7 +28,6 @@ void Arduboy::begin()
 {
   boot(); // required
   bootUtils();
-
   bootLogo();
 
   // Audio
@@ -37,13 +36,9 @@ void Arduboy::begin()
   audio.begin();
 }
 
-// this is pusposely duplicated (without logo) so that
-// whichever is actually used is linked and the one
-// that is not is gone without wasting any space in flash
-void Arduboy::beginNoLogo()
+void Arduboy::beginMinimal()
 {
   boot(); // required
-  bootUtils();
 
   // Audio
   tunes.initChannel(PIN_SPEAKER_1);
@@ -51,14 +46,21 @@ void Arduboy::beginNoLogo()
   audio.begin();
 }
 
+void Arduboy::flashlight()
+{
+  // sendLCDCommand(OLED_ALL_PIXELS_ON); // smaller than allPixelsOn()
+  blank();
+  setRGBled(255,255,255);
+  while(!pressed(DOWN_BUTTON)) {
+    idle();
+  }
+  setRGBled(0,0,0);
+}
+
 void Arduboy::bootUtils()
 {
-  // flashlight
   if(pressed(UP_BUTTON)) {
-    // sendLCDCommand(OLED_ALL_PIXELS_ON); // smaller than allPixelsOn()
-    blank();
-    setRGBled(255,255,255);
-    while(true) {}
+    flashlight();
   }
 }
 

src/Arduboy.h

@@ -43,14 +43,23 @@ public:
 
   /// Initializes the hardware
   void begin();
-  /// Initializes the hardware (but with no boot logo)
-  void beginNoLogo();
+  /// Initializes the hardware (no logo, no other bootime niceities)
+  void beginMinimal();
   void start() __attribute__ ((deprecated("use begin() instead")));
 
   /// Scrolls in the Arduboy logo
   void bootLogo();
 
-  /// Boot utils such as flashlight, etc
+  /// Flashlight mode
+  /**
+   * Hold up key when booting to enable, press down key to exit
+   * or simply turn off your Arduboy.  Your sketches can also
+   * call this at any time.  It goes into a tight loop until the
+   * down buttn is pressed.
+   */
+  void flashlight();
+
+  /// Boot utility detection (such as flashlight, etc.)
   void inline bootUtils() __attribute__((always_inline));
 
   /// Clears display.