added Key_LEDEffectPrevious

src/Kaleidoscope-LEDControl.cpp

@@ -130,8 +130,12 @@ Key LEDControl::eventHandler(Key mappedKey, byte row, byte col, uint8_t keyState
   if (mappedKey.flags != (SYNTHETIC | IS_INTERNAL | LED_TOGGLE))
     return mappedKey;
 
-  if (keyToggledOn(keyState))
+  if (keyToggledOn(keyState)) {
-    next_mode();
+    if (mappedKey == Key_LEDEffectNext)
+      next_mode();
+    else
+      prev_mode();
+  }
 
   return Key_NoKey;
 }

src/Kaleidoscope-LEDControl.h

@@ -7,6 +7,7 @@
 #define LED_TOGGLE   B00000001  // Synthetic, internal
 
 #define Key_LEDEffectNext (Key) { 0,  KEY_FLAGS | SYNTHETIC | IS_INTERNAL | LED_TOGGLE }
+#define Key_LEDEffectPrevious (Key) { 1,  KEY_FLAGS | SYNTHETIC | IS_INTERNAL | LED_TOGGLE }
 
 namespace kaleidoscope {
 /** Base class for LED modes.