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diff --git a/atmel-samd/asf4/samd21/hal/include/hal_delay.h b/atmel-samd/asf4/samd21/hal/include/hal_delay.h
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+++ b/atmel-samd/asf4/samd21/hal/include/hal_delay.h
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+/**
+ * \file
+ *
+ * \brief HAL delay related functionality declaration.
+ *
+ * Copyright (C) 2014-2016 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \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 microcontroller 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.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#include <hpl_irq.h>
+#include <hpl_reset.h>
+#include <hpl_sleep.h>
+
+#ifndef _HAL_DELAY_H_INCLUDED
+#define _HAL_DELAY_H_INCLUDED
+
+#include <compiler.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \addtogroup doc_driver_hal_delay Delay Driver
+ *
+ *@{
+ */
+
+/**
+ * \brief Initialize Delay driver
+ *
+ * \param[in] hw The pointer to hardware instance
+ */
+void delay_init(void *const hw);
+
+/**
+ * \brief Perform delay in us
+ *
+ * This function performs delay for the given amount of microseconds.
+ *
+ * \param[in] us The amount delay in us
+ */
+void delay_us(const uint16_t us);
+
+/**
+ * \brief Perform delay in ms
+ *
+ * This function performs delay for the given amount of milliseconds.
+ *
+ * \param[in] ms The amount delay in ms
+ */
+void delay_ms(const uint16_t ms);
+
+/**
+ * \brief Retrieve the current driver version
+ *
+ * \return Current driver version.
+ */
+uint32_t delay_get_version(void);
+
+/**@}*/
+#ifdef __cplusplus
+}
+#endif
+#endif /* _HAL_DELAY_H_INCLUDED */