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diff --git a/include/libopencm3/stm32/exti.h b/include/libopencm3/stm32/exti.h
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+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Mark Butler <mbutler@physics.otago.ac.nz>
+ *
+ * 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 3 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 LIBOPENCM3_EXTI_H
+#define LIBOPENCM3_EXTI_H
+
+#include <libopencm3/stm32/memorymap.h>
+#include <libopencm3/cm3/common.h>
+
+/* --- EXTI registers ------------------------------------------------------ */
+
+#define EXTI_IMR MMIO32(EXTI_BASE + 0x00)
+#define EXTI_EMR MMIO32(EXTI_BASE + 0x04)
+#define EXTI_RTSR MMIO32(EXTI_BASE + 0x08)
+#define EXTI_FTSR MMIO32(EXTI_BASE + 0x0c)
+#define EXTI_SWIER MMIO32(EXTI_BASE + 0x10)
+#define EXTI_PR MMIO32(EXTI_BASE + 0x14)
+
+/* EXTI number definitions */
+#define EXTI0 (1 << 0)
+#define EXTI1 (1 << 1)
+#define EXTI2 (1 << 2)
+#define EXTI3 (1 << 3)
+#define EXTI4 (1 << 4)
+#define EXTI5 (1 << 5)
+#define EXTI6 (1 << 6)
+#define EXTI7 (1 << 7)
+#define EXTI8 (1 << 8)
+#define EXTI9 (1 << 9)
+#define EXTI10 (1 << 10)
+#define EXTI11 (1 << 11)
+#define EXTI12 (1 << 12)
+#define EXTI13 (1 << 13)
+#define EXTI14 (1 << 14)
+#define EXTI15 (1 << 15)
+#define EXTI16 (1 << 16)
+#define EXTI17 (1 << 17)
+#define EXTI18 (1 << 18)
+#define EXTI19 (1 << 19)
+
+/* Trigger types */
+typedef enum trigger_e {
+ EXTI_TRIGGER_RISING,
+ EXTI_TRIGGER_FALLING,
+ EXTI_TRIGGER_BOTH,
+} exti_trigger_type;
+
+void exti_set_trigger(u32 extis, exti_trigger_type trig);
+void exti_enable_request(u32 extis);
+void exti_disable_request(u32 extis);
+void exti_reset_request(u32 extis);
+void exti_select_source(u32 exti, u32 gpioport);
+
+#endif