From 5e1ce4ec964de4eb8dce850d8e0656bf8e5a0200 Mon Sep 17 00:00:00 2001
From: Markus Hitter <mah@jump-ing.de>
Date: Tue, 5 Oct 2010 13:18:59 +0200
Subject: [PATCH] Refined the check wether the timer interrupt is enabled, as
 per triffid's request.

---
 dda_queue.c | 2 +-
 timer.h     | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/dda_queue.c b/dda_queue.c
index 3ef2665..87effa7 100644
--- a/dda_queue.c
+++ b/dda_queue.c
@@ -84,7 +84,7 @@ void enqueue(TARGET *t) {
 	#endif
 
 	// fire up in case we're not running yet
-	if (TIMSK1 == 0)
+	if (timerInterruptIsEnabled() == 0)
 		next_move();
 }
 
diff --git a/timer.h b/timer.h
index 67773a8..810273d 100644
--- a/timer.h
+++ b/timer.h
@@ -30,5 +30,6 @@ void delayMicrosecondsInterruptible(unsigned int us);
 
 #define enableTimerInterrupt()	do { TIMSK1 |= (1<<OCIE1A); } while (0)
 #define disableTimerInterrupt() do { TIMSK1 &= ~(1<<OCIE1A); } while (0)
+#define timerInterruptIsEnabled() (TIMSK1 & (1 << OCIE1A))
 
 #endif	/* _TIMER_H */