diff options
Diffstat (limited to 'src/avr/timer.c')
| -rw-r--r-- | src/avr/timer.c | 42 |
1 files changed, 12 insertions, 30 deletions
diff --git a/src/avr/timer.c b/src/avr/timer.c index a6da9b4f..06d8845e 100644 --- a/src/avr/timer.c +++ b/src/avr/timer.c @@ -39,13 +39,6 @@ timer_set(uint16_t next) } static inline void -timer_set_clear(uint16_t next) -{ - OCR1A = next; - TIFR1 = 1<<OCF1A; -} - -static inline void timer_repeat_set(uint16_t next) { // Timer1B is used to limit the number of timers run from a timer1A irq @@ -78,6 +71,15 @@ timer_init(void) } DECL_INIT(timer_init); +static void +timer_shutdown(void) +{ + // Reenable timer irq + timer_set(timer_get() + 50); + TIFR1 = 1<<OCF1A; +} +DECL_SHUTDOWN(timer_shutdown); + /**************************************************************** * 32bit timer wrappers @@ -120,35 +122,15 @@ timer_periodic(void) } } -#define TIMER_MIN_TICKS 100 - -// Set the next timer wake time (in absolute clock ticks). Caller -// must disable irqs. The caller should not schedule a time more than -// a few milliseconds in the future. -uint8_t -timer_set_next(uint32_t next) -{ - uint32_t cur = timer_read_time(); - if ((int16_t)(OCR1A - (uint16_t)cur) < 0 && !(TIFR1 & (1<<OCF1A))) - // Already processing timer irqs - try_shutdown("timer_set_next called during timer dispatch"); - uint32_t mintime = cur + TIMER_MIN_TICKS; - if (sched_is_before(mintime, next)) { - timer_set_clear(next); - return 0; - } - timer_set_clear(mintime); - return 1; -} - #define TIMER_IDLE_REPEAT_TICKS 8000 #define TIMER_REPEAT_TICKS 3000 #define TIMER_MIN_TRY_TICKS 60 // 40 ticks to exit irq; 20 ticks of progress #define TIMER_DEFER_REPEAT_TICKS 200 -// Similar to timer_set_next(), but wait for the given time if it is -// in the near future. +// Set the next timer wake time (in absolute clock ticks) or return 1 +// if the next timer is too close to schedule. Caller must disable +// irqs. uint8_t timer_try_set_next(uint32_t target) { |