// 1.5 ns step
uint64_t stick_get_us(void)
{
CM_ATOMIC_CONTEXT();
uint32_t rld = systick_get_reload() + 1;
uint64_t ss = (rld-systick_get_value()) * 1000 / rld;
if (nvic_get_pending_irq(NVIC_SYSTICK_IRQ) && (ss < 500)) {
// overflow between atomic and get value?
ss += 1000;
}
return ticks * 1000 + ss;
}
uint32_t tick_delta_time_tick(uint32_t start, uint32_t end)
{
uint32_t reload_val = systick_get_reload() - 1;
uint32_t diff;
if (end > start)
{
diff = end - start;
}
else
{
diff = reload_val - (start - end) + 1;
}
return diff;
}
void sys_tick_handler(void)
{
uint32_t next_timer = 0;
volatile uint32_t reload = systick_get_reload();
uint32_t this_timeslice;
SysTick_Hook();
jiffies+= clock_interval;
_n_int++;
next_timer = ktimers_check();
#ifdef CONFIG_LOWPOWER
if (next_timer < 0 || next_timer > 1000){
next_timer = 1000; /* Wake up every second if timer is too long, or if no timers */
}
/* Checking deep sleep */
if (next_timer >= 1000 && scheduler_can_sleep()) {
systick_interrupt_disable();
cputimer_start(next_timer);
return;
}
#ifdef CONFIG_TICKLESS
this_timeslice = task_timeslice();
if (_sched_active && (this_timeslice == 0) && (!task_running())) {
schedule();
} else {
systick_interrupt_disable();
cputimer_start(this_timeslice);
}
return;
#endif
#endif
if (_sched_active && ((task_timeslice() == 0) || (!task_running()))) {
schedule();
(void)next_timer;
}
}
