rotation: added another missing rotation

src/lib/conversion/rotation.cpp

@@ -194,5 +194,10 @@ rotate_3f(enum Rotation rot, float &x, float &y, float &z)
         tmp = z; z = x; x = -tmp;
         return;
     }
+    case ROTATION_ROLL_180_PITCH_270: {
+        tmp = z; z = x; x = tmp;
+        y = -y;
+        return;
+    }
     }
 }

src/lib/conversion/rotation.h

@@ -75,6 +75,7 @@ enum Rotation {
 	ROTATION_PITCH_90            = 24,
 	ROTATION_PITCH_270           = 25,
 	ROTATION_ROLL_270_YAW_270    = 26,
+	ROTATION_ROLL_180_PITCH_270  = 27,
 	ROTATION_MAX
 };
 
@@ -111,7 +112,8 @@ const rot_lookup_t rot_lookup[] = {
 	{270,   0, 135 },
 	{  0,  90,   0 },
 	{  0, 270,   0 },
-	{270,   0, 270 }
+	{270,   0, 270 },
+	{180, 270,   0 }
 };
 
 /**