From 3b4bb18c06844d2d316123beb1d7f4dcaf52fdec Mon Sep 17 00:00:00 2001
From: misonyo <misonyo@foxmail.com>
Date: Tue, 25 Dec 2018 09:59:16 +0800
Subject: [components/drivers/hwtimer]修复定时器向下计数模式时时间获取错误bug
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---
 components/drivers/hwtimer/hwtimer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/components/drivers/hwtimer/hwtimer.c b/components/drivers/hwtimer/hwtimer.c
index cd85b3baef..83a76c7b9d 100644
--- a/components/drivers/hwtimer/hwtimer.c
+++ b/components/drivers/hwtimer/hwtimer.c
@@ -153,7 +153,7 @@ static rt_size_t rt_hwtimer_read(struct rt_device *dev, rt_off_t pos, void *buff
     cnt = timer->ops->count_get(timer);
     if (timer->info->cntmode == HWTIMER_CNTMODE_DW)
     {
-        cnt = timer->info->maxcnt - cnt;
+        cnt = (timer->freq * timer->period_sec) - cnt;
     }
 
     t = timer->overflow * timer->period_sec + cnt/(float)timer->freq;
-- 
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