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timer: Allow board code to define its own timer_is_before implementation

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Move sched_is_before() from sched.c to timer_is_before() in the board
specific timer code.  This allows the board code to provide its own
definition.

Also, remove the sched_from_us() and sched_read_time() wrapper
functions and change the callers to directly invoke timer_from_us() /
timer_read_time().

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2017-03-24 23:01:08 -04:00
parent 14340ac4df
commit 60e488eb17
9 changed files with 48 additions and 47 deletions
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11
src/generic/timer.c
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@ -24,6 +24,15 @@ timer_from_us(uint32_t us)
return us * (CONFIG_CLOCK_FREQ / 1000000);
}
// Return true if time1 is before time2. Always use this function to
// compare times as regular C comparisons can fail if the counter
// rolls over.
uint8_t
timer_is_before(uint32_t time1, uint32_t time2)
{
return (int32_t)(time1 - time2) < 0;
}
// Called by main code once every millisecond. (IRQs disabled.)
void
timer_periodic(void)
@ -50,7 +59,7 @@ timer_try_set_next(uint32_t next)
goto done;
// Next timer is in the past or near future - can't reschedule to it
if (likely(sched_is_before(now, timer_repeat_until))) {
if (likely(timer_is_before(now, timer_repeat_until))) {
// Can run more timers from this irq; briefly allow irqs
irq_enable();
while (diff >= 0) {