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@@ -0,0 +1,42 @@
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+/*
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+Copyright 2011 Jun Wako <wakojun@gmail.com>
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+
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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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+
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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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+
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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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+
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+#ifndef TIMER_AVR_H
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+#define TIMER_AVR_H 1
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+
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+#include <stdint.h>
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+
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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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+
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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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+
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+#endif
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