From e57ab2a7bfb69c0ef9b5b7fa8e53e20a500e7c6c Mon Sep 17 00:00:00 2001 From: Keith Packard Date: Thu, 25 Oct 2012 13:42:10 -0700 Subject: altos: Provide ao_task_alarm_tick to reduce per-tick cost Cache the next wakeup time and check that before jumping to the task code. Signed-off-by: Keith Packard --- src/stm/ao_timer.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'src/stm/ao_timer.c') diff --git a/src/stm/ao_timer.c b/src/stm/ao_timer.c index d69035f8..e07625d8 100644 --- a/src/stm/ao_timer.c +++ b/src/stm/ao_timer.c @@ -44,7 +44,8 @@ void stm_tim6_isr(void) stm_tim6.sr = 0; ++ao_tick_count; #if HAS_TASK_QUEUE - ao_task_check_alarm((uint16_t) ao_tick_count); + if (ao_task_alarm_tick && (int16_t) (ao_tick_count - ao_task_alarm_tick) >= 0) + ao_task_check_alarm((uint16_t) ao_tick_count); #endif #if AO_DATA_ALL if (++ao_data_count == ao_data_interval) { -- cgit v1.2.3