Save some power

src/main.c

@@ -113,6 +113,8 @@ int main()
 			sseg_set_char(1, '0' + (ms_counter / 1000) % 10, true);
 			sseg_set_char(0, '0' + (ms_counter / 10000) % 10, false);
 		}
+
+		__asm("wfi");
 	}
 	return 0;
 }