From 8a98e7ef89a90e8f7295b8c1d1dcba0941ea79dc Mon Sep 17 00:00:00 2001
From: zhaohe <h_zhaohe@163.com>
Date: Wed, 5 Jun 2024 22:01:52 +0800
Subject: [PATCH] update

---
 chip/zgpio.hpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/chip/zgpio.hpp b/chip/zgpio.hpp
index 7afef56..1a81bda 100644
--- a/chip/zgpio.hpp
+++ b/chip/zgpio.hpp
@@ -85,6 +85,8 @@ class ZGPIO {
   bool     setState(bool state);
   void     toggleState();
 
+  bool isNull() { return m_pin == PinNull; }
+
   Pin_t getPin() { return m_pin; }
 
   IRQn_Type     getEXTIIRQn();