From b1756bbf26f987dbae7c416aab891ea490cfdb8f Mon Sep 17 00:00:00 2001
From: danny <12793148@qq.com>
Date: Sun, 8 Sep 2024 18:54:44 +0800
Subject: [PATCH] =?UTF-8?q?=E7=AC=AC=E4=B8=89=E7=AB=A0=E5=A2=9E=E5=8A=A0?=
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---
 book/03：通用输入输出/01.md | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/book/03：通用输入输出/01.md b/book/03：通用输入输出/01.md
index d8f19c3..878f40e 100644
--- a/book/03：通用输入输出/01.md
+++ b/book/03：通用输入输出/01.md
@@ -324,4 +324,7 @@ void HAL_GPIO_WritePin(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin, GPIO_PinState Pin
 
 2. 程序相对比较复杂。
 
-   
+# 4. 扩展
+
+[用按键控制LED](https://www.bilibili.com/video/BV1Z84y157dx/?spm_id_from=333.788&vd_source=3c8e333d6657680a469ddf0238f01d6a)
+