42 lines
1.2 KiB
C
42 lines
1.2 KiB
C
/*
|
|
Copyright 2011 Jun Wako <wakojun@gmail.com>
|
|
|
|
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 <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef TIMER_AVR_H
|
|
#define TIMER_AVR_H 1
|
|
|
|
#include <stdint.h>
|
|
|
|
#ifndef TIMER_PRESCALER
|
|
# if F_CPU > 16000000
|
|
# define TIMER_PRESCALER 256
|
|
# elif F_CPU > 2000000
|
|
# define TIMER_PRESCALER 64
|
|
# elif F_CPU > 250000
|
|
# define TIMER_PRESCALER 8
|
|
# else
|
|
# define TIMER_PRESCALER 1
|
|
# endif
|
|
#endif
|
|
#define TIMER_RAW_FREQ (F_CPU/TIMER_PRESCALER)
|
|
#define TIMER_RAW TCNT0
|
|
#define TIMER_RAW_TOP (TIMER_RAW_FREQ/1000)
|
|
|
|
#if (TIMER_RAW_TOP > 255)
|
|
# error "Timer0 can't count 1ms at this clock freq. Use larger prescaler."
|
|
#endif
|
|
|
|
#endif
|