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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 libmaple/include/libmaple/exti.h
+ * @brief External interrupt control
+ */
+
+/* See notes/exti.txt for more info */
+
+#ifndef _LIBMAPLE_EXTI_H_
+#define _LIBMAPLE_EXTI_H_
+
+#ifdef __cplusplus
+extern "C"{
+#endif
+
+#include <series/exti.h>        /* provides EXTI_BASE */
+#include <libmaple/libmaple_types.h>
+
+/*
+ * Register map and base pointer.
+ */
+
+/** 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;
+
+/*
+ * Types: exti_num, exti_cfg, exti_trigger_mode.
+ *
+ * A combination of these three specifies an external interrupt
+ * configuration (see exti_attach_interrupt()).
+ */
+
+/** EXTI line. */
+typedef enum exti_num {
+    EXTI0,    /**< EXTI line 0 */
+    EXTI1,    /**< EXTI line 1 */
+    EXTI2,    /**< EXTI line 2 */
+    EXTI3,    /**< EXTI line 3 */
+    EXTI4,    /**< EXTI line 4 */
+    EXTI5,    /**< EXTI line 5 */
+    EXTI6,    /**< EXTI line 6 */
+    EXTI7,    /**< EXTI line 7 */
+    EXTI8,    /**< EXTI line 8 */
+    EXTI9,    /**< EXTI line 9 */
+    EXTI10,   /**< EXTI line 10 */
+    EXTI11,   /**< EXTI line 11 */
+    EXTI12,   /**< EXTI line 12 */
+    EXTI13,   /**< EXTI line 13 */
+    EXTI14,   /**< EXTI line 14 */
+    EXTI15,   /**< EXTI line 15 */
+} exti_num;
+
+/**
+ * @brief EXTI port configuration
+ *
+ * These specify which GPIO port an external interrupt line should be
+ * connected to.
+ */
+typedef enum exti_cfg {
+    EXTI_PA,                    /**< Use PAx pin */
+    EXTI_PB,                    /**< Use PBx pin */
+    EXTI_PC,                    /**< Use PCx pin */
+    EXTI_PD,                    /**< Use PDx pin */
+    EXTI_PE,                    /**< Use PEx pin */
+    EXTI_PF,                    /**< Use PFx pin */
+    EXTI_PG,                    /**< Use PGx pin */
+    EXTI_PH,                    /**< Use PHx pin */
+    EXTI_PI,                    /**< Use PIx pin */
+} exti_cfg;
+
+/** 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;
+
+/*
+ * Routines
+ */
+
+void exti_attach_interrupt(exti_num num,
+                           exti_cfg port,
+                           voidFuncPtr handler,
+                           exti_trigger_mode mode);
+void exti_detach_interrupt(exti_num num);
+
+/**
+ * @brief Set the GPIO port for an EXTI line.
+ *
+ * This is a low-level routine that most users will not
+ * need. exti_attach_interrupt() handles calling this function
+ * appropriately.
+ *
+ * @param num EXTI line
+ * @param port EXTI configuration for GPIO port to connect to num.
+ * @see exti_num
+ * @see exti_cfg
+ */
+extern void exti_select(exti_num num, exti_cfg port);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif