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irq: Support sleeping when mcu is idle

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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2017-07-12 22:16:16 -04:00
parent 969485c754
commit 118fd21cb8
13 changed files with 101 additions and 10 deletions
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17
src/generic/timer_irq.c
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@ -8,6 +8,7 @@
#include "board/irq.h" // irq_disable
#include "board/misc.h" // timer_from_us
#include "board/timer_irq.h" // timer_dispatch_many
#include "basecmd.h" // stats_note_sleep
#include "command.h" // shutdown
#include "sched.h" // sched_timer_kick
@ -85,9 +86,23 @@ timer_dispatch_many(void)
void
timer_task(void)
{
static uint32_t last_timer;
uint32_t lst = last_timer;
irq_disable();
timer_repeat_until = timer_read_time() + TIMER_IDLE_REPEAT_TICKS;
uint32_t next = timer_get_next(), cur = timer_read_time();
if (lst != next) {
timer_repeat_until = cur + TIMER_IDLE_REPEAT_TICKS;
irq_enable();
last_timer = next;
return;
}
// Sleep the processor
irq_wait();
uint32_t post_sleep = timer_read_time();
timer_repeat_until = post_sleep + TIMER_IDLE_REPEAT_TICKS;
irq_enable();
stats_note_sleep(post_sleep - cur);
}
DECL_TASK(timer_task);