--- /dev/null
+/*
+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