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diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/bootloader/dfu/nrf_dfu_trigger_usb.h b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/bootloader/dfu/nrf_dfu_trigger_usb.h
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+/**
+ * Copyright (c) 2017 - 2018, Nordic Semiconductor ASA
+ * 
+ * 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 NRF_DFU_TRIGGER_USB_H
+#define NRF_DFU_TRIGGER_USB_H
+
+#include "sdk_errors.h"
+
+/**
+ * @defgroup nrf_dfu_trigger_usb USB DFU trigger library
+ * @ingroup app_common
+ *
+ * @brief @tagAPI52840 USB DFU trigger library is used to enter the bootloader and read the firmware version.
+ *
+ * @details See @ref lib_dfu_trigger_usb for additional documentation.
+ * @{
+ */
+
+/**
+ * @brief Function for initializing the USB DFU trigger library.
+ *
+ * @note  If the USB is also used for other purposes, then this function must be called after USB is
+ *        initialized but before it is enabled. In this case, the configuration flag @ref
+ *        NRF_DFU_TRIGGER_USB_USB_SHARED must be set to 1.
+ *
+ * @note  Calling this again after the first success has no effect and returns @ref NRF_SUCCESS.
+ *
+ * @note  If @ref APP_USBD_CONFIG_EVENT_QUEUE_ENABLE is on (1), USB events must be handled manually.
+ *        See @ref app_usbd_event_queue_process.
+ *
+ * @retval NRF_SUCCESS  On successful initialization.
+ * @return An error code on failure, for example if called at a wrong time.
+ */
+ret_code_t nrf_dfu_trigger_usb_init(void);
+
+/** @} */
+
+#endif //NRF_DFU_TRIGGER_USB_H