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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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26
src/avr/timer.c
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@ -6,6 +6,7 @@
#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
@ -62,6 +63,12 @@ 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)
{
@ -103,6 +110,9 @@ timer_init(void)
// enable interrupt
TIMSK1 = 1<<OCIE1A;
irq_restore(flag);
// Enable idle on sleep instruction
SMCR = 0x01;
}
DECL_INIT(timer_init);
@ -196,8 +206,22 @@ done:
void
timer_task(void)
{
static uint16_t last_timer;
uint16_t lst = last_timer;
irq_disable();
timer_repeat_set(timer_get() + TIMER_IDLE_REPEAT_TICKS);
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);
irq_enable();
stats_note_sleep(post_sleep - cur);
}
DECL_TASK(timer_task);