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avr: Implement internal avr specific timer to handle 16bit overflows
Don't rely on the generic scheduler code to always have a timer no more than 1ms in the future. Instead, create an avr specific timer that will be called every 0x8000 ticks. This simplifies the generic code and it reduces the amount of code that needs to be run every millisecond. Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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parent
6a63c27542
commit
78982ebb51
5 changed files with 31 additions and 26 deletions
13
src/sched.c
13
src/sched.c
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@ -24,12 +24,11 @@ static struct timer sentinel_timer, deleted_timer;
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// The periodic_timer simplifies the timer code by ensuring there is
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// always a timer on the timer list and that there is always a timer
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// not more than 1ms in the future.
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// not far in the future.
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static uint_fast8_t
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periodic_event(struct timer *t)
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{
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timer_periodic();
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periodic_timer.waketime += timer_from_us(1000);
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periodic_timer.waketime += timer_from_us(100000);
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sentinel_timer.waketime = periodic_timer.waketime + 0x80000000;
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return SF_RESCHEDULE;
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}
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@ -162,9 +161,9 @@ sched_timer_dispatch(void)
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return next_waketime;
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}
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// Shutdown all user timers on an emergency stop.
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void
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sched_timer_shutdown(void)
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// Remove all user timers on a shutdown
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static void
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sched_timer_reset(void)
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{
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timer_list = &deleted_timer;
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deleted_timer.waketime = periodic_timer.waketime;
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@ -172,7 +171,6 @@ sched_timer_shutdown(void)
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periodic_timer.next = &sentinel_timer;
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timer_kick();
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}
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DECL_SHUTDOWN(sched_timer_shutdown);
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/****************************************************************
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@ -230,6 +228,7 @@ run_shutdown(int reason)
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if (!shutdown_status)
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shutdown_reason = reason;
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shutdown_status = 2;
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sched_timer_reset();
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extern void ctr_run_shutdownfuncs(void);
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ctr_run_shutdownfuncs();
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shutdown_status = 1;
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