- /*
- 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/>.
- */
-
- #pragma once
-
- #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
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