From 2bbb27c29c1693fe48b250bf1cc7231e1e793e3b Mon Sep 17 00:00:00 2001
From: tangyuxin <462747508@qq.com>
Date: Tue, 6 Mar 2018 10:38:35 +0800
Subject: [drivers]修复定时器驱动框架单次长时间定时不准确的问题
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---
 components/drivers/hwtimer/hwtimer.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

(limited to 'components/drivers')

diff --git a/components/drivers/hwtimer/hwtimer.c b/components/drivers/hwtimer/hwtimer.c
index bbe50aa2f7..066c5f6f6c 100644
--- a/components/drivers/hwtimer/hwtimer.c
+++ b/components/drivers/hwtimer/hwtimer.c
@@ -192,14 +192,15 @@ static rt_size_t rt_hwtimer_write(struct rt_device *dev, rt_off_t pos, const voi
     if (size != sizeof(rt_hwtimerval_t))
         return 0;
 
+    timer->ops->stop(timer);
+    timer->overflow = 0;
+
+    t = timeout_calc(timer, (rt_hwtimerval_t*)buffer);
     if ((timer->cycles <= 1) && (timer->mode == HWTIMER_MODE_ONESHOT))
     {
         opm = HWTIMER_MODE_ONESHOT;
     }
-    timer->ops->stop(timer);
-    timer->overflow = 0;
 
-    t = timeout_calc(timer, (rt_hwtimerval_t*)buffer);
     if (timer->ops->start(timer, t, opm) != RT_EOK)
         size = 0;
 
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