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diff --git a/atmel-samd/asf4/samd21/usb/device/usbdc.h b/atmel-samd/asf4/samd21/usb/device/usbdc.h
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+/**
+ * \file
+ *
+ * \brief USB Device Stack Core Layer Definition.
+ *
+ * Copyright (C) 2015-2016 Atmel Corporation. All rights reserved.
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel AVR product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ */
+
+#ifndef _USB_USBDC_H_
+#define _USB_USBDC_H_
+
+#include "usb_includes.h"
+#include "usb_protocol.h"
+#include "hal_usb_device.h"
+
+/** USB device states. */
+enum usbd_state {
+	USBD_S_OFF     = 0,
+	USBD_S_POWER   = 1,
+	USBD_S_DEFAULT = 2,
+	USBD_S_ADDRESS = 3,
+	USBD_S_CONFIG  = 4,
+	USBD_S_SUSPEND = 0x10
+};
+
+/** USB device core handler type. */
+enum usbdc_handler_type { USBDC_HDL_SOF, USBDC_HDL_REQ, USBDC_HDL_CHANGE };
+
+/** USB device core change notification type. */
+enum usbdc_change_type {
+	/** Change of connection, detected by vbus. */
+	USBDC_C_CONN,
+	/** Change of state, by RESET, SetAddress(), SetConfig(). */
+	USBDC_C_STATE,
+	/** Change of power. */
+	USBDC_C_POWER,
+	/** Change of remote wakeup setting. */
+	USBDC_C_REMOTE_WAKEUP
+};
+
+/** Power change. */
+enum usbdc_power_type { USBDC_ACTIVE, USBDC_SLEEP, USBDC_SUSPEND };
+
+/** USB device general function control code. */
+enum usbdf_control {
+	/** Enable the function.
+     *  int32_t ctrl(usbdf, USBDF_ENABLE, struct usbd_descriptors *desc);
+     *  Parameter holds interface descriptor and
+     *  configuration descriptor end position.
+     */
+	USBDF_ENABLE,
+	/** Disable the function.
+     *  int32_t ctrl(usbdf, USBDF_DISABLE, struct usbd_descriptors *desc);
+     *  Parameter holds interface descriptor and
+     *  configuration descriptor end position.
+     *  Input NULL to force disable the function anyway.
+     */
+	USBDF_DISABLE,
+	/** Get interface alternate setting.
+     *  int32_t ctrl(usbdf, USBDF_GET_IFACE, struct usb_req *req);
+     *  Parameter holds interface number who should return
+     *  the alternate setting.
+     */
+	USBDF_GET_IFACE
+};
+
+/** Describes a list of USB descriptors. */
+struct usbd_descriptors {
+	/** Pointer to Start of Descriptors. */
+	uint8_t *sod;
+	/** Pointer to End of Descriptors. */
+	uint8_t *eod;
+};
+
+/** Describes the USB device core descriptors. */
+struct usbdc_descriptors {
+	struct usbd_descriptors *ls_fs;
+#ifdef CONF_USBD_HS_SP
+	struct usbd_descriptors *hs;
+#endif
+};
+
+/** Describes a list of core handler descriptor. */
+struct usbdc_handler {
+	/** Pointer to next handler. */
+	struct usbdc_handler *next;
+	/** Pointer to handler function. */
+	FUNC_PTR func;
+};
+
+/** Forward declaration for USB device function driver. */
+struct usbdf_driver;
+
+/** SOF handling function. */
+typedef void (*usbdc_sof_cb_t)(void);
+
+/** REQ handling function. */
+typedef int32_t (*usbdc_req_cb_t)(uint8_t ep, struct usb_req *req, enum usb_ctrl_stage stage);
+
+/** Change notification callback function. */
+typedef void (*usbdc_change_cb_t)(enum usbdc_change_type change, uint32_t value);
+
+/** Control function for USB device general function driver. */
+typedef int32_t (*usbdf_control_cb_t)(struct usbdf_driver *drv, enum usbdf_control ctrl, void *param);
+
+/** USB device general function driver descriptor. */
+struct usbdf_driver {
+	/** Pointer to next function.*/
+	struct usbdf_driver *next;
+	/** Pointer to control function.*/
+	usbdf_control_cb_t ctrl;
+	/** Pointer to function driver specific data. */
+	void *func_data;
+};
+
+/**
+ * \brief Register the handler
+ * \param[in] type USB device core handler type.
+ * \param[in] h Pointer to usb device core handler.
+ */
+void usbdc_register_handler(enum usbdc_handler_type type, const struct usbdc_handler *h);
+
+/**
+ * \brief Unregister the handler
+ * \param[in] type USB device core handler type.
+ * \param[in] h Pointer to usb device core handler.
+ */
+void usbdc_unregister_handler(enum usbdc_handler_type type, const struct usbdc_handler *h);
+
+/**
+ * \brief Initialize the USB device core driver
+ * \param[in] ctrl_buf Pointer to a buffer to be used by usb device ctrl endpoint
+ *  Note: the size of ctrl_buf should not be less than the size of EP0
+ * \return Operation status.
+ */
+int32_t usbdc_init(uint8_t *ctrl_buf);
+
+/**
+ * \brief Deinitialize the USB device core driver
+ * \return Operation status.
+ */
+int32_t usbdc_deinit(void);
+
+/**
+ * \brief Register function support of a USB device function
+ * \param[in] func Pointer to usb device function driver structure
+ */
+void usbdc_register_function(struct usbdf_driver *func);
+
+/**
+ * \brief Unregister function support of a USB device function
+ * \param[in] func Pointer to usb device function driver structure
+ */
+void usbdc_unregister_function(struct usbdf_driver *func);
+
+/**
+ * \brief Validate the descriptors
+ * \param[in] desces Pointer to usb device core descriptors
+ * \return Operation status.
+ */
+int32_t usbdc_validate_desces(struct usbd_descriptors *desces);
+
+/**
+ * \brief Issue USB device data transfer
+ * \param[in] ep endpointer address.
+ * \param[in] buf Pointer to data transfer buffer.
+ * \param[in] size the size of data transfer.
+ * \param[in] zlp flag to indicate zero length packet.
+ * \return Operation status.
+ */
+int32_t usbdc_xfer(uint8_t ep, uint8_t *buf, uint32_t size, bool zlp);
+
+/**
+ * \brief Start the USB device driver with specific descriptors set
+ * \param[in] desces Pointer to usb device core descriptors
+ * \return Operation status.
+ */
+int32_t usbdc_start(struct usbd_descriptors *desces);
+
+/**
+ * \brief Stop the USB device driver
+ * \return Operation status.
+ */
+int32_t usbdc_stop(void);
+
+/**
+ * \brief Attach the USB device to host
+ */
+void usbdc_attach(void);
+
+/**
+ * \brief Detach the USB device from host
+ */
+void usbdc_detach(void);
+
+/**
+ * \brief Send remote wakeup to host
+ */
+void usbdc_remotewakeup(void);
+
+/**
+ * \brief Return USB device ctrl end pointer buffer start address
+ */
+uint8_t *usbdc_get_ctrl_buffer(void);
+
+/**
+ * \brief Return current USB state
+ */
+uint8_t usbdc_get_state(void);
+
+/**
+ * \brief Return version
+ */
+uint32_t usbdc_get_version(void);
+
+#endif /* USBDC_H_ */