From ec441e9aa66ee1a10c8295d7f5659fe9acb5bfbe Mon Sep 17 00:00:00 2001
From: Kaspar Schleiser <kaspar@schleiser.de>
Date: Thu, 9 Jul 2015 15:03:12 +0200
Subject: [PATCH] native: periph/timer: prevent underflow in timer_set_absolute
---
cpu/native/periph/timer.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/cpu/native/periph/timer.c b/cpu/native/periph/timer.c
index 3257e5ee80..1aa50f9405 100644
--- a/cpu/native/periph/timer.c
+++ b/cpu/native/periph/timer.c
@@ -122,8 +122,15 @@ int timer_set(tim_t dev, int channel, unsigned int offset)
int timer_set_absolute(tim_t dev, int channel, unsigned int value)
{
uint32_t now = timer_read(dev);
+ int64_t target = (int32_t)(value - now);
- timer_set(dev, channel, value - now);
+ DEBUG("timer_set_absolute(): delta=%lli\n", target);
+ if (target < 0 && target > -NATIVE_TIMER_MIN_RES) {
+ DEBUG("timer_set_absolute(): preventing underflow.\n");
+ target = NATIVE_TIMER_MIN_RES;
+ }
+
+ timer_set(dev, channel, target);
return 1;
}
--
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