From e9a96aec6a30e6f7b9619031ca9c5cb0f755d9b5 Mon Sep 17 00:00:00 2001
From: yelvlab <wanghao19950516@gmail.com>
Date: Wed, 13 Aug 2025 00:56:55 +0800
Subject: [PATCH] add delay ms safe & add led heart beat

---
 Inc/led.h         |  1 +
 Inc/systick.h     |  3 +++
 Src/gd32e23x_it.c |  2 ++
 Src/led.c         | 37 +++++++++++++++++++++++++++++++++++++
 Src/main.c        |  5 +++--
 Src/systick.c     | 22 ++++++++++++++++++++++
 6 files changed, 68 insertions(+), 2 deletions(-)

diff --git a/Inc/led.h b/Inc/led.h
index 6177e10..7376a5e 100644
--- a/Inc/led.h
+++ b/Inc/led.h
@@ -8,5 +8,6 @@ void led_init(void);
 void led_on(void);
 void led_off(void);
 void led_toggle(void);
+void led_heart_beat(void);
 
 #endif // LED_H
diff --git a/Inc/systick.h b/Inc/systick.h
index 1944b07..83d892f 100644
--- a/Inc/systick.h
+++ b/Inc/systick.h
@@ -24,4 +24,7 @@ void delay_ms(uint32_t count);
 /* delay a time in microseconds */
 void delay_us(uint32_t count);
 
+/* delay function that doesn't interfere with SysTick interrupt */
+void delay_ms_safe(uint32_t count);
+
 #endif /* SYS_TICK_H */
\ No newline at end of file
diff --git a/Src/gd32e23x_it.c b/Src/gd32e23x_it.c
index d3a29d1..3512280 100644
--- a/Src/gd32e23x_it.c
+++ b/Src/gd32e23x_it.c
@@ -36,6 +36,7 @@ OF SUCH DAMAGE.
 #include "systick.h"
 #include "uart.h"
 #include "uart_ring_buffer.h"
+#include "led.h"
 
 /*!
     \brief      this function handles NMI exception
@@ -96,6 +97,7 @@ void PendSV_Handler(void)
     \retval     none
 */
 void SysTick_Handler(void) {
+    led_heart_beat();  // LED心跳指示灯
 }
 
 void USART0_IRQHandler(void) {
diff --git a/Src/led.c b/Src/led.c
index b39ec12..1661867 100644
--- a/Src/led.c
+++ b/Src/led.c
@@ -1,5 +1,42 @@
 #include "led.h"
 
+/**
+ * @brief LED心跳指示灯功能
+ * @details 实现类似心跳的LED闪烁模式：快闪两次然后暂停
+ *          适合在SysTick中断中调用，通过计数器控制闪烁节拍
+ * @note 假设SysTick中断频率为1ms，心跳周期约为2秒
+ *       心跳模式：亮200ms->灭200ms->亮200ms->灭1400ms（循环）
+ */
+void led_heart_beat(void)
+{
+    static uint16_t heart_beat_counter = 0;
+    
+    // 心跳周期：2000ms (假设SysTick为1ms中断)
+    // 模式：亮200ms -> 灭200ms -> 亮200ms -> 灭1400ms
+    heart_beat_counter++;
+    
+    if (heart_beat_counter <= 200) {
+        // 第一次亮：0-200ms
+        led_on();
+    }
+    else if (heart_beat_counter <= 400) {
+        // 第一次灭：200-400ms  
+        led_off();
+    }
+    else if (heart_beat_counter <= 600) {
+        // 第二次亮：400-600ms
+        led_on();
+    }
+    else if (heart_beat_counter <= 2000) {
+        // 长时间灭：600-2000ms
+        led_off();
+    }
+    else {
+        // 重置计数器，开始新的心跳周期
+        heart_beat_counter = 0;
+    }
+}
+
 void led_init(void) {
     rcu_periph_clock_enable(LED_RCU);
     gpio_mode_set(LED_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, LED_PIN);
diff --git a/Src/main.c b/Src/main.c
index cc932ba..fced534 100644
--- a/Src/main.c
+++ b/Src/main.c
@@ -57,9 +57,10 @@ int main(void)
     led_init();
 
     printf("Hello USART0!");
-    led_off();
+    // 移除led_off()调用，让心跳函数控制LED
     while(1){
-        delay_ms(100);
+        // 使用不会干扰SysTick中断的安全延时函数
+        delay_ms_safe(100);
         command_process();
     }
 }
diff --git a/Src/systick.c b/Src/systick.c
index dc4b213..8478805 100644
--- a/Src/systick.c
+++ b/Src/systick.c
@@ -30,6 +30,10 @@ void systick_config(void)
     count_1us = (float)SystemCoreClock/8000000;
     //计算了每毫秒所需的 SysTick 计数值
     count_1ms = (float)count_1us * 1000;
+    
+    // 配置SysTick为1ms周期中断
+    // 注意：SysTick_Config会自动设置时钟源为HCLK，所以需要使用SystemCoreClock/1000
+    SysTick_Config(SystemCoreClock / 1000);  // 1ms中断
 }
 
 /**
@@ -88,4 +92,22 @@ void delay_ms(uint32_t count)
     SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
     //将 SysTick 计数器的当前值清零，以便下次使用
     SysTick->VAL = 0x0000U;
+}
+
+/**
+ * ************************************************************************
+ * @brief delay_ms_safe 毫秒延时函数（不干扰SysTick中断）
+ * @details 使用简单循环实现延时，不会重新配置SysTick
+ * @param[in] count  毫秒值
+ * ************************************************************************
+ */
+void delay_ms_safe(uint32_t count)
+{
+    // 基于系统时钟的简单循环延时
+    // 这是一个粗略的估计，实际延时可能有偏差
+    uint32_t loops_per_ms = SystemCoreClock / 8000; // 粗略估计
+    
+    for(uint32_t i = 0; i < count; i++) {
+        for(volatile uint32_t j = 0; j < loops_per_ms; j++);
+    }
 }
\ No newline at end of file