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diff --git a/libmaple/stm32f2/include/series/usart.h b/libmaple/stm32f2/include/series/usart.h
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+++ b/libmaple/stm32f2/include/series/usart.h
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+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2012 LeafLabs, LLC.
+ *
+ * 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/stm32f2/include/series/usart.h
+ * @author Marti Bolivar <mbolivar@leaflabs.com>
+ * @brief STM32F2 USART support.
+ */
+
+#ifndef _LIBMAPLE_STM32F2_USART_H_
+#define _LIBMAPLE_STM32F2_USART_H_
+
+#ifdef __cplusplus
+extern "C"{
+#endif
+
+#include <libmaple/gpio.h>      /* for gpio_af */
+
+/*
+ * Register map base pointers.
+ */
+
+struct usart_reg_map;
+
+/** USART1 register map base pointer */
+#define USART1_BASE                     ((struct usart_reg_map*)0x40011000)
+/** USART2 register map base pointer */
+#define USART2_BASE                     ((struct usart_reg_map*)0x40004400)
+/** USART3 register map base pointer */
+#define USART3_BASE                     ((struct usart_reg_map*)0x40004800)
+/** UART4 register map base pointer */
+#define UART4_BASE                      ((struct usart_reg_map*)0x40004C00)
+/** UART5 register map base pointer */
+#define UART5_BASE                      ((struct usart_reg_map*)0x40005000)
+/** USART6 register map base pointer */
+#define USART6_BASE                     ((struct usart_reg_map*)0x40011400)
+
+/*
+ * F2-only register bit definitions.
+ */
+
+/* Control register 1 */
+
+/**
+ * @brief Oversampling mode bit.
+ * Availability: STM32F2. */
+#define USART_CR1_OVER8_BIT             15
+
+/**
+ * @brief Oversampling mode.
+ * Availability: STM32F2. */
+#define USART_CR1_OVER8                 (1U << USART_CR1_OVER8_BIT)
+
+/* Control register 3 */
+
+/** One sample bit method enable bit. */
+#define USART_CR3_ONEBIT_BIT            11
+
+/** One bit sample method enable. */
+#define USART_CR3_ONEBIT                (1 << USART_CR3_ONEBIT_BIT)
+/** Sample method: Three sample bit method. */
+#define USART_CR3_ONEBIT_3SAMPLE        (0 << USART_CR3_ONEBIT_BIT)
+/** Sample method: One sample bit method. */
+#define USART_CR3_ONEBIT_1SAMPLE        (1 << USART_CR3_ONEBIT_BIT)
+
+/*
+ * Devices
+ */
+
+struct usart_dev;
+extern struct usart_dev *USART1;
+extern struct usart_dev *USART2;
+extern struct usart_dev *USART3;
+extern struct usart_dev *UART4;
+extern struct usart_dev *UART5;
+extern struct usart_dev *USART6;
+
+/*
+ * Routines
+ */
+
+gpio_af usart_get_af(struct usart_dev *dev);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif