From d3fa070d10331727b9094b4976a94a8143dcba30 Mon Sep 17 00:00:00 2001 From: "David A. Mellis" Date: Fri, 21 Oct 2011 11:54:11 -0400 Subject: Lowering timer 1 prescale factor (to 8 from 64) for F_CPU less than 8 MHz. Otherwise, you can see flicker on an LED. --- cores/arduino/wiring.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'cores/arduino/wiring.c') diff --git a/cores/arduino/wiring.c b/cores/arduino/wiring.c index 1b3fd44..bc01949 100755 --- a/cores/arduino/wiring.c +++ b/cores/arduino/wiring.c @@ -221,10 +221,14 @@ void init() // set timer 1 prescale factor to 64 sbi(TCCR1B, CS11); +#if F_CPU >= 8000000L sbi(TCCR1B, CS10); +#endif #elif defined(TCCR1) && defined(CS11) && defined(CS10) sbi(TCCR1, CS11); +#if F_CPU >= 8000000L sbi(TCCR1, CS10); +#endif #endif // put timer 1 in 8-bit phase correct pwm mode #if defined(TCCR1A) && defined(WGM10) -- cgit v1.2.3-18-g5258