43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
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/*
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Copyright 2011 Jun Wako <wakojun@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef TIMER_AVR_H
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#define TIMER_AVR_H 1
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#include <stdint.h>
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#ifndef TIMER_PRESCALER
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# if F_CPU > 16000000
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# define TIMER_PRESCALER 256
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# elif F_CPU > 2000000
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# define TIMER_PRESCALER 64
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# elif F_CPU > 250000
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# define TIMER_PRESCALER 8
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# else
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# define TIMER_PRESCALER 1
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# endif
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#endif
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#define TIMER_RAW_FREQ (F_CPU/TIMER_PRESCALER)
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#define TIMER_RAW TCNT0
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#define TIMER_RAW_TOP (TIMER_RAW_FREQ/1000)
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#if (TIMER_RAW_TOP > 255)
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# error "Timer0 can't count 1ms at this clock freq. Use larger prescaler."
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#endif
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#endif
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