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diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/components/802_15_4/api/HAL/hal_timer_critical.h b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/802_15_4/api/HAL/hal_timer_critical.h
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+/**
+ * Copyright (c) 2016 - 2018 Nordic Semiconductor ASA and Luxoft Global Operations Gmbh.
+ * 
+ * All Rights Reserved.
+ * 
+ * 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, except as embedded into a Nordic
+ *    Semiconductor ASA integrated circuit in a product or a software update for
+ *    such product, 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. Neither the name of Nordic Semiconductor ASA nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ * 
+ * 4. This software, with or without modification, must only be used with a
+ *    Nordic Semiconductor ASA integrated circuit.
+ * 
+ * 5. Any software provided in binary form under this license must not be reverse
+ *    engineered, decompiled, modified and/or disassembled.
+ * 
+ * 
+ * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS 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 HAL_TIMER_CRITICAL_H_INCLUDED
+#define HAL_TIMER_CRITICAL_H_INCLUDED
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/**
+ * @defgroup hal_timer_critical HAL Hardware Critical Timer
+ * @ingroup hal_15_4
+ * @{
+ * @brief Module to declare HAL hardware critical timer interface
+ */
+
+/**@brief   Prototype for critical timer handler.
+ */
+typedef void (* hal_timer_critical_handler_t)(void);
+
+
+/**@brief Starts hardware critical timer.
+ *
+ * @param[in] interval_us  timer interval for timer start.
+ * @param[in] handler critical timer event handler.
+ */
+void hal_timer_critical_start(uint32_t interval_us, hal_timer_critical_handler_t handler);
+
+
+/**@brief Stops hardware critical timer.
+ */
+void hal_timer_critical_stop(void);
+
+
+/**@brief Check if critical timer is currently used.
+ *
+ * @retval timer_state     true  - timer is running now
+ *                         false - timer in stop mode
+ */
+bool is_critical_timer_started(void);
+
+/** @} */
+
+#endif /* HAL_TIMER_CRITICAL_H_INCLUDED */