From: batt <batt@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Thu, 18 Oct 2007 16:18:14 +0000 (+0000)
Subject: Avoid overflow when TIMER_HW_HPTICKS_PER_SEC is big.
X-Git-Tag: 1.0.0~332
X-Git-Url: https://codewiz.org/gitweb?a=commitdiff_plain;h=4193143e05964bebf86903e3966875b917771c72;p=bertos.git

Avoid overflow when TIMER_HW_HPTICKS_PER_SEC is big.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@910 38d2e660-2303-0410-9eaa-f027e97ec537
---

diff --git a/drv/timer.h b/drv/timer.h
index 7e2a6288..d5bb7743 100644
--- a/drv/timer.h
+++ b/drv/timer.h
@@ -158,7 +158,7 @@ INLINE hptime_t us_to_hptime(utime_t us)
 #if TIMER_HW_HPTICKS_PER_SEC > 10000000UL
 	return us * ((TIMER_HW_HPTICKS_PER_SEC + 500000UL) / 1000000UL);
 #else
-	return (us * TIMER_HW_HPTICKS_PER_SEC + 500000UL) / 1000000UL;
+	return (us * ((TIMER_HW_HPTICKS_PER_SEC + 500) / 1000UL) + 500) / 1000UL;
 #endif
 }
 
@@ -166,9 +166,9 @@ INLINE hptime_t us_to_hptime(utime_t us)
 INLINE utime_t hptime_to_us(hptime_t hpticks)
 {
 #if TIMER_HW_HPTICKS_PER_SEC < 100000UL
-	return hpticks * (1000000UL / TIMER_HW_HPTICKS_PER_SEC);
+	return hpticks * ((1000000UL + TIMER_HW_HPTICKS_PER_SEC / 2) / TIMER_HW_HPTICKS_PER_SEC);
 #else
-	return (hpticks * 1000000UL) / TIMER_HW_HPTICKS_PER_SEC;
+	return (hpticks * 1000UL) / ((TIMER_HW_HPTICKS_PER_SEC + 500) / 1000UL);
 #endif /* TIMER_HW_HPTICKS_PER_SEC < 100000UL */
 }