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diff --git a/watch-library/hal/include/hpl_ext_irq.h b/watch-library/hal/include/hpl_ext_irq.h
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+/**
+ * \file
+ *
+ * \brief External IRQ related functionality declaration.
+ *
+ * Copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Subject to your compliance with these terms, you may use Microchip
+ * software and any derivatives exclusively with Microchip products.
+ * It is your responsibility to comply with third party license terms applicable
+ * to your use of third party software (including open source software) that
+ * may accompany Microchip software.
+ *
+ * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
+ * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
+ * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
+ * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
+ * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
+ * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
+ * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
+ * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
+ * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
+ * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
+ * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_EXT_IRQ_H_INCLUDED
+#define _HPL_EXT_IRQ_H_INCLUDED
+
+/**
+ * \addtogroup HPL EXT IRQ
+ *
+ * \section hpl_ext_irq_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#include <compiler.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \name HPL functions
+ */
+//@{
+/**
+ * \brief Initialize external interrupt module
+ *
+ * This function does low level external interrupt configuration.
+ *
+ * \param[in] cb The pointer to callback function from external interrupt
+ *
+ * \return Initialization status.
+ * \retval -1 External irq module is already initialized
+ * \retval 0 The initialization is completed successfully
+ */
+int32_t _ext_irq_init(void (*cb)(const uint32_t pin));
+
+/**
+ * \brief Deinitialize external interrupt module
+ *
+ * \return Initialization status.
+ * \retval -1 External irq module is already deinitialized
+ * \retval 0 The de-initialization is completed successfully
+ */
+int32_t _ext_irq_deinit(void);
+
+/**
+ * \brief Enable / disable external irq
+ *
+ * \param[in] pin Pin to enable external irq on
+ * \param[in] enable True to enable, false to disable
+ *
+ * \return Status of external irq enabling / disabling
+ * \retval -1 External irq module can't be enabled / disabled
+ * \retval 0 External irq module is enabled / disabled successfully
+ */
+int32_t _ext_irq_enable(const uint32_t pin, const bool enable);
+//@}
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_EXT_IRQ_H_INCLUDED */