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This commit is contained in:
Ludwig Ortmann 2013-11-14 11:40:10 +01:00
parent e8a03a8287
commit 2d419e6648
1 changed files with 9 additions and 7 deletions
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16
core/hwtimer.c
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@ -54,20 +54,22 @@ static void hwtimer_releasemutex(void* mutex) {
void hwtimer_spin(unsigned long ticks)
{
unsigned long start = hwtimer_arch_now();
unsigned long co = start + ticks;
unsigned long x = hwtimer_arch_now();
/**
* If hwtimer_arch_now + ticks results in an overflow in co,
* If hwtimer_arch_now + ticks results in an overflow,
* hwtimer_arch_now needs to spin until it has overflowed as well.
*
* If co has overflowed, co is smaller than ticks by at least one.
* If it has overflowed, the result is smaller than ticks by at
* least one.
*/
if (co < ticks) {
while (hwtimer_arch_now() > start);
if (x + ticks < ticks) {
while (hwtimer_arch_now() > x);
}
while (hwtimer_arch_now() < co);
x += ticks;
while (hwtimer_arch_now() < x);
}
/*---------------------------------------------------------------------------*/