Use reference sentinel to efficiently reset dirty flags on rollover

src/main.c

@@ -74,11 +74,10 @@ static int Init(void)
 	// be some sanity checking before these values are
 	// used.
 
-	MEM_Init();
-
-	// mem.temp = 30.50f;
-	// mem.dewp = 15.25f;
+	// mem.temp = 20.50f;
+	// mem.dewp = 10.25f;
 	// MEM_Write(&mem);
+	// MEM_Dump();
 	// MEM_Free();
 
 	if (MEM_Read(&mem) == 0) {