simplify the debouncing API.

debouncing.cpp

@@ -5,14 +5,10 @@
 
 
 boolean key_was_pressed (byte keyState) {
-    return (! key_was_not_pressed(keyState));
-}
-
-boolean key_was_not_pressed (byte keyState) {
     if ( keyState & B00001000 || keyState & B00000100) {
-        return false;
-    } else {
         return true;
+    } else {
+        return false;
     }
 }
 
@@ -24,12 +20,8 @@ boolean key_is_pressed (byte keyState) {
     }
 }
 
-boolean key_is_not_pressed (byte keyState) {
-    return !key_is_pressed(keyState);
-}
-
 boolean key_toggled_on(byte keyState) {
-    if (key_is_pressed(keyState) && key_was_not_pressed(keyState)) {
+    if (key_is_pressed(keyState) && ! key_was_pressed(keyState)) {
         return true;
     } else {
         return false;
@@ -38,7 +30,7 @@ boolean key_toggled_on(byte keyState) {
 
 
 boolean key_toggled_off(byte keyState) {
-    if (key_was_pressed(keyState) && key_is_not_pressed(keyState)) {
+    if (key_was_pressed(keyState) && ! key_is_pressed(keyState)) {
         return true;
     } else {
         return false;

debouncing.h

@@ -3,8 +3,6 @@
 
 
 boolean key_was_pressed (byte keyState);
-boolean key_was_not_pressed (byte keyState);
 boolean key_is_pressed (byte keyState);
-boolean key_is_not_pressed (byte keyState);
 boolean key_toggled_on(byte keyState);
 boolean key_toggled_off(byte keyState);