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sched: Implement generic sleep mechanism based on tasks pending

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Track when tasks are pending and spin in irq_wait() when no tasks are
pending.  This improves the mechanism for sleeping the processor -
it's simpler for the board specific code and it reduces the
possibility of the processor sleeping when tasks are busy.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2017-08-07 12:33:08 -04:00
parent a9982beacf
commit 2c272f99a3
9 changed files with 60 additions and 80 deletions
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23
src/avr/timer.c
View file

@ -6,7 +6,6 @@
#include <avr/interrupt.h> // TCNT1
#include "autoconf.h" // CONFIG_AVR_CLKPR
#include "basecmd.h" // stats_note_sleep
#include "board/misc.h" // timer_from_us
#include "command.h" // shutdown
#include "irq.h" // irq_save
@ -63,12 +62,6 @@ timer_set(uint16_t next)
OCR1A = next;
}
static inline uint16_t
timer_get_next(void)
{
return OCR1A;
}
static inline void
timer_repeat_set(uint16_t next)
{
@ -213,22 +206,8 @@ done:
void
timer_task(void)
{
static uint16_t last_timer;
uint16_t lst = last_timer;
irq_disable();
uint16_t next = timer_get_next(), cur = timer_get();
if (lst != next) {
timer_repeat_set(cur + TIMER_IDLE_REPEAT_TICKS);
irq_enable();
last_timer = next;
return;
}
// Sleep the processor
irq_wait();
uint16_t post_sleep = timer_get();
timer_repeat_set(post_sleep + TIMER_IDLE_REPEAT_TICKS);
timer_repeat_set(timer_get() + TIMER_IDLE_REPEAT_TICKS);
irq_enable();
stats_note_sleep(post_sleep - cur);
}
DECL_TASK(timer_task);