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diff --git a/src-avr/avr.h b/src-avr/avr.h
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+/*
+ * Copyright © 2011 Keith Packard <keithp@keithp.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; version 2 of the License.
+ *
+ * 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, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#ifndef _AVR_H_
+#define _AVR_H_
+
+#include <stdio.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+#define TEENSY 1
+#if TEENSY
+#define F_CPU 16000000UL // 16 MHz
+#else
+#define F_CPU 8000000UL // 8 MHz
+#endif
+
+#define __pdata
+#define __data
+#define __xdata
+#define __code const
+#define __reentrant
+#define __naked
+#define __critical
+#define __interrupt(n)
+
+#define asm_nop asm("nop");
+
+#endif /* _AVR_H_ */