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diff --git a/libmaple/include/libmaple/exti.h b/libmaple/include/libmaple/exti.h
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+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 Perry Hung.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *****************************************************************************/
+
+/**
+ * @file exti.h
+ * @brief External interrupt control prototypes and defines
+ */
+
+/* See notes/exti.txt for more info */
+
+#ifndef _LIBMAPLE_EXTI_H_
+#define _LIBMAPLE_EXTI_H_
+
+#ifdef __cplusplus
+extern "C"{
+#endif
+
+#include <libmaple/libmaple.h>
+#include <libmaple/gpio.h>
+
+/** EXTI register map type */
+typedef struct exti_reg_map {
+    __io uint32 IMR;   /**< Interrupt mask register */
+    __io uint32 EMR;   /**< Event mask register */
+    __io uint32 RTSR;  /**< Rising trigger selection register */
+    __io uint32 FTSR;  /**< Falling trigger selection register */
+    __io uint32 SWIER; /**< Software interrupt event register */
+    __io uint32 PR;    /**< Pending register */
+} exti_reg_map;
+
+/** EXTI register map base pointer */
+#define EXTI_BASE                       ((struct exti_reg_map*)0x40010400)
+
+/** External interrupt trigger mode */
+typedef enum exti_trigger_mode {
+    EXTI_RISING,         /**< Trigger on the rising edge */
+    EXTI_FALLING,        /**< Trigger on the falling edge */
+    EXTI_RISING_FALLING  /**< Trigger on both the rising and falling edges */
+} exti_trigger_mode;
+
+void exti_attach_interrupt(afio_exti_num num,
+                           afio_exti_port port,
+                           voidFuncPtr handler,
+                           exti_trigger_mode mode);
+void exti_detach_interrupt(afio_exti_num num);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif