From 6708da2661d693f855b6f56d69af1e2fb8502463 Mon Sep 17 00:00:00 2001
From: Lars-Dominik Braun <lars@6xq.net>
Date: Tue, 23 Sep 2014 17:24:57 +0200
Subject: Add wakeup source mechanism

Should reduce amount of cpu wakeups with expensive computations.
---
 timer.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'timer.c')

diff --git a/timer.c b/timer.c
index ce30b60..8de6157 100644
--- a/timer.c
+++ b/timer.c
@@ -22,13 +22,17 @@ ISR(TIMER1_COMPA_vect) {
 	time += OCR1A * US_PER_TICK;
 	if (hits == maxhits-1) {
 		OCR1A = lastcount;
+	} else if (hits >= maxhits) {
+		enableWakeup (WAKE_TIMER);
 	}
 }
 
 /*	Check if timer was hit, return time since last restart or 0 if not hit yet
  */
 uint32_t timerHit () {
-	if (hits >= maxhits) {
+	if (shouldWakeup (WAKE_TIMER)) {
+		disableWakeup (WAKE_TIMER);
+
 		const uint32_t ret = time;
 		/* reset timer, start again */
 		hits = 0;
-- 
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