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diff --git a/atmel-samd/asf4/samd51/hal/include/hpl_evsys.h b/atmel-samd/asf4/samd51/hal/include/hpl_evsys.h
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+/**
+ * \file
+ *
+ * \brief Event system related functionality declaration.
+ *
+ * Copyright (C) 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
+ *
+ */
+
+#ifndef _HPL_EVSYS_H_INCLUDED
+#define _HPL_EVSYS_H_INCLUDED
+
+/**
+ * \addtogroup HPL EVSYS
+ *
+ * \section hpl_eveys_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#include <compiler.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief Initialize event system.
+ *
+ * \return Status of operation.
+ */
+int32_t _event_system_init(void);
+
+/**
+ * \brief Deinitialize event system.
+ *
+ * \return Status of operation.
+ */
+int32_t _event_system_deinit(void);
+
+/**
+ * \brief Enable/disable event reception by the given user from the given
+ *        channel
+ *
+ * \param[in] user A user to enable
+ * \param[in] channel A channel the user is assigned to
+ * \param[in] on true to enable, false to disable
+ *
+ * \return Status of operation.
+ */
+int32_t _event_system_enable_user(const uint16_t user, const uint16_t channel, const bool on);
+
+/**
+ * \brief Enable/disable event generation by the given generator for the given
+ *        channel
+ *
+ * \param[in] generator A generator to enable
+ * \param[in] channel A channel the user is assigned to
+ * \param[in] on true to enable, false to disable
+ *
+ * \return Status of operation.
+ */
+int32_t _event_system_enable_generator(const uint16_t generator, const uint16_t channel, const bool on);
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_EVSYS_H_INCLUDED */