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diff --git a/src/stm32f4-disco/ao_scheme_os.h b/src/stm32f4-disco/ao_scheme_os.h
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+++ b/src/stm32f4-disco/ao_scheme_os.h
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+/*
+ * Copyright © 2016 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 _AO_SCHEME_OS_H_
+#define _AO_SCHEME_OS_H_
+
+#include "ao.h"
+#include "ao_scheme.h"
+
+#define AO_SCHEME_POOL		131072
+#define AO_SCHEME_TOKEN_MAX	64
+
+#define AO_SCHEME_BIG
+
+#ifndef __BYTE_ORDER
+#define	__LITTLE_ENDIAN	1234
+#define	__BIG_ENDIAN	4321
+#define __BYTE_ORDER	__LITTLE_ENDIAN
+#endif
+
+extern int _ao_scheme_getc(void);
+
+#define ao_scheme_getc(f) ({ (void) (f); _ao_scheme_getc(); })
+#undef putc
+#define putc(c, f) ({ (void) (f); ao_putchar(c); })
+#define fputs(s, f) ({ (void) (f); ao_put_string(s); })
+#define fiprintf(f, ...) ({ (void) (f); iprintf(__VA_ARGS__); })
+
+static inline void
+ao_scheme_abort(void)
+{
+	ao_panic(1);
+}
+
+#ifdef LEDS_AVAILABLE
+static inline void
+ao_scheme_os_led(int led)
+{
+	ao_led_set(led);
+}
+#endif
+
+#define AO_SCHEME_JIFFIES_PER_SECOND	AO_HERTZ
+
+static inline void
+ao_scheme_os_delay(int delay)
+{
+	ao_delay(delay);
+}
+
+static inline int
+ao_scheme_os_jiffy(void)
+{
+	return ao_tick_count;
+}
+#endif