diff options
| author | Keith Packard <keithp@keithp.com> | 2011-05-20 01:35:49 -0700 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2011-05-20 01:35:49 -0700 |
| commit | d67df9a6dc76ba52f32fa4c0b141825b97a2fbc8 (patch) | |
| tree | 02fc0fed6c08ad54afe2a1ed9161132fb2f91d88 | |
| parent | 92fcfc2e8e5a9cb789c8d4be36d38c1a73ddd413 (diff) | |
src-avr: Add 'sleep_cpu' to reduce power usage while idle
Signed-off-by: Keith Packard <keithp@keithp.com>
| -rw-r--r-- | src-avr/ao_task.c | 22 | ||||
| -rw-r--r-- | src-avr/ao_timer.c | 3 | ||||
| -rw-r--r-- | src-avr/avr.h | 1 |
3 files changed, 9 insertions, 17 deletions
diff --git a/src-avr/ao_task.c b/src-avr/ao_task.c index 83f12e2b..51467133 100644 --- a/src-avr/ao_task.c +++ b/src-avr/ao_task.c @@ -102,19 +102,6 @@ ao_add_task(__xdata struct ao_task * task, void (*start)(void), __code char *nam ao_init_stack(task, start); } -void -ao_show_task_from(void) -{ -// if (ao_cur_task) -// printf("switching from %s\n", ao_cur_task->name); -} - -void -ao_show_task_to(void) -{ -// printf("switching to %s\n", ao_cur_task->name); -} - /* Task switching function. This must not use any stack variables */ void ao_yield(void) __naked @@ -187,7 +174,6 @@ ao_yield(void) __naked SP = AO_STACK_START - 1; #endif - ao_show_task_from(); /* Find a task to run. If there isn't any runnable task, * this loop will run forever, which is just fine */ @@ -211,10 +197,11 @@ ao_yield(void) __naked break; } -#ifdef AVR -#else /* Enter lower power mode when there isn't anything to do */ if (ao_next_task_index == ao_cur_task_index) +#ifdef AVR + sleep_cpu(); +#else PCON = PCON_IDLE; #endif } @@ -225,7 +212,6 @@ ao_yield(void) __naked uint8_t sp_l, sp_h; sp_l = (uint16_t) ao_cur_task->sp; sp_h = ((uint16_t) ao_cur_task->sp) >> 8; - ao_show_task_to(); cli(); asm("out __SP_H__,%0" : : "r" (sp_h) ); asm("out __SP_L__,%0" : : "r" (sp_l) ); @@ -291,9 +277,11 @@ ao_yield(void) __naked uint8_t ao_sleep(__xdata void *wchan) { + cli(); __critical { ao_cur_task->wchan = wchan; } + sei(); ao_yield(); ao_cur_task->alarm = 0; if (ao_cur_task->wchan) { diff --git a/src-avr/ao_timer.c b/src-avr/ao_timer.c index cc48dd2a..f0918a7d 100644 --- a/src-avr/ao_timer.c +++ b/src-avr/ao_timer.c @@ -162,6 +162,9 @@ ao_clock_init(void) PLLCSR |= (1 << PLLE); while (!(PLLCSR & (1 << PLOCK))) ; + + set_sleep_mode(SLEEP_MODE_IDLE); + sleep_enable(); #else /* Switch system clock to crystal oscilator */ CLKCON = (CLKCON & ~CLKCON_OSC_MASK) | (CLKCON_OSC_XTAL); diff --git a/src-avr/avr.h b/src-avr/avr.h index 8c9c7bd7..9811a07f 100644 --- a/src-avr/avr.h +++ b/src-avr/avr.h @@ -21,6 +21,7 @@ #include <stdio.h> #include <avr/io.h> #include <avr/interrupt.h> +#include <avr/sleep.h> #if TEENSY #define F_CPU 16000000UL // 16 MHz |