From 784c510a0cf2a72c63dcb476fb7e49fd31a2147f Mon Sep 17 00:00:00 2001
From: chenguang <lychenguang@outlook.com>
Date: Sat, 21 Feb 2026 20:09:38 -0500
Subject: [PATCH] =?UTF-8?q?=E5=BB=B6=E8=BF=9F=E5=87=BD=E6=95=B0?=
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---
 3-5  GPIO_光敏传感器/System/Delay.c | 41 +++++++++++++++++++++++++++++
 3-5  GPIO_光敏传感器/System/Delay.h |  8 ++++++
 2 files changed, 49 insertions(+)
 create mode 100644 3-5  GPIO_光敏传感器/System/Delay.c
 create mode 100644 3-5  GPIO_光敏传感器/System/Delay.h

diff --git a/3-5  GPIO_光敏传感器/System/Delay.c b/3-5  GPIO_光敏传感器/System/Delay.c
new file mode 100644
index 0000000..20089ca
--- /dev/null
+++ b/3-5  GPIO_光敏传感器/System/Delay.c	
@@ -0,0 +1,41 @@
+#include "stm32f10x.h"
+
+/**
+  * @brief  微秒级延时
+  * @param  xus 延时时长，范围：0~233015
+  * @retval 无
+  */
+void Delay_us(uint32_t xus)
+{
+	SysTick->LOAD = 72 * xus;				//设置定时器重装值
+	SysTick->VAL = 0x00;					//清空当前计数值
+	SysTick->CTRL = 0x00000005;				//设置时钟源为HCLK，启动定时器
+	while(!(SysTick->CTRL & 0x00010000));	//等待计数到0
+	SysTick->CTRL = 0x00000004;				//关闭定时器
+}
+
+/**
+  * @brief  毫秒级延时
+  * @param  xms 延时时长，范围：0~4294967295
+  * @retval 无
+  */
+void Delay_ms(uint32_t xms)
+{
+	while(xms--)
+	{
+		Delay_us(1000);
+	}
+}
+ 
+/**
+  * @brief  秒级延时
+  * @param  xs 延时时长，范围：0~4294967295
+  * @retval 无
+  */
+void Delay_s(uint32_t xs)
+{
+	while(xs--)
+	{
+		Delay_ms(1000);
+	}
+} 
diff --git a/3-5  GPIO_光敏传感器/System/Delay.h b/3-5  GPIO_光敏传感器/System/Delay.h
new file mode 100644
index 0000000..04c8ef8
--- /dev/null
+++ b/3-5  GPIO_光敏传感器/System/Delay.h	
@@ -0,0 +1,8 @@
+#ifndef __DELAY_H
+#define __DELAY_H
+
+void Delay_us(uint32_t us);
+void Delay_ms(uint32_t ms);
+void Delay_s(uint32_t s);
+
+#endif