From db1ceea7c9ebef91ac8dd68f31fdb2a6485e9ea8 Mon Sep 17 00:00:00 2001
From: yueling hu <502966985@qq.com>
Date: Wed, 21 May 2025 14:48:23 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A0rt=5Fdelta=5Ftick=5Fget?=
 =?UTF-8?q?=E5=87=BD=E6=95=B0?=
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---
 include/rtthread.h |  1 +
 src/clock.c        | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/include/rtthread.h b/include/rtthread.h
index a1c0e77a038..c08edc30433 100644
--- a/include/rtthread.h
+++ b/include/rtthread.h
@@ -98,6 +98,7 @@ void rt_object_put_sethook(void (*hook)(struct rt_object *object));
  * clock & timer interface
  */
 rt_tick_t rt_tick_get(void);
+rt_tick_t rt_delta_tick_get(rt_tick_t last_time);
 void rt_tick_set(rt_tick_t tick);
 void rt_tick_increase(void);
 void rt_tick_increase_tick(rt_tick_t tick);
diff --git a/src/clock.c b/src/clock.c
index 3481f22c61c..948db3a6388 100644
--- a/src/clock.c
+++ b/src/clock.c
@@ -73,6 +73,25 @@ rt_tick_t rt_tick_get(void)
 }
 RTM_EXPORT(rt_tick_get);
 
+/**
+ * @brief    This function will return delta tick from last_time.
+ *
+ * @param    last_time to consider
+ * 
+ * @return   Return delta tick.
+ */
+ rt_tick_t rt_delta_tick_get(rt_tick_t last_time)
+ {
+    rt_tick_t delta;
+    rt_tick_t tnow = rt_tick_get();
+    if (tnow >= last_time)
+        delta = tnow - last_time;
+    else 
+        delta = RT_TICK_MAX - last_time + tnow + 1;
+    return delta;
+ }
+ RTM_EXPORT(rt_delta_tick_get);
+
 /**
  * @brief    This function will set current tick.
  *