From f4125707399d11a7d80587659c464b9bcddb8c56 Mon Sep 17 00:00:00 2001 From: tmk Date: Thu, 7 Jun 2012 02:25:15 +0900 Subject: Moved files to common, protocol and doc directory --- common/timer.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 89 insertions(+) create mode 100644 common/timer.c (limited to 'common/timer.c') diff --git a/common/timer.c b/common/timer.c new file mode 100644 index 000000000..48a38c9b6 --- /dev/null +++ b/common/timer.c @@ -0,0 +1,89 @@ +/* +Copyright 2011 Jun Wako + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 2 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see . +*/ + +#include +#include +#include +#include "timer.h" + + +// counter resolution 1ms +volatile uint16_t timer_count = 0; + +void timer_init(void) +{ + // Timer0 CTC mode + TCCR0A = 0x02; + +#if TIMER_PRESCALER == 1 + TCCR0B = 0x01; +#elif TIMER_PRESCALER == 8 + TCCR0B = 0x02; +#elif TIMER_PRESCALER == 64 + TCCR0B = 0x03; +#elif TIMER_PRESCALER == 256 + TCCR0B = 0x04; +#elif TIMER_PRESCALER == 1024 + TCCR0B = 0x05; +#else +# error "Timer prescaler value is NOT vaild." +#endif + + OCR0A = TIMER_RAW_TOP; + TIMSK0 = (1<