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diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/experimental_log/nrf_log_backend_interface.h b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/experimental_log/nrf_log_backend_interface.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_LOG_BACKEND_INTERFACE_H
+#define NRF_LOG_BACKEND_INTERFACE_H
+
+/**@file
+ * @addtogroup nrf_log Logger module
+ * @ingroup    app_common
+ *
+ * @defgroup nrf_log_backend_interface Logger backend interface
+ * @{
+ * @ingroup  nrf_log
+ * @brief    The nrf_log backend interface.
+ */
+
+#include "nrf_memobj.h"
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/**
+ * @brief nrf_log entry.
+ */
+typedef nrf_memobj_t nrf_log_entry_t;
+
+/* Forward declaration of the nrf_log_backend_t type. */
+typedef struct nrf_log_backend_s nrf_log_backend_t;
+
+/**
+ * @brief Logger backend API.
+ */
+typedef struct
+{
+    /**
+     * @brief @ref nrf_log_backend_put
+     */
+    void (*put)(nrf_log_backend_t const * p_backend, nrf_log_entry_t * p_entry);
+
+    /**
+     * @brief @ref nrf_log_backend_panic_set
+     */
+    void (*panic_set)(nrf_log_backend_t const * p_backend);
+
+    /**
+     * @brief @ref nrf_log_backend_flush
+     */
+    void (*flush)(nrf_log_backend_t const * p_backend);
+} nrf_log_backend_api_t;
+
+/**
+ * @brief Logger backend structure.
+ */
+struct nrf_log_backend_s
+{
+    nrf_log_backend_api_t const * p_api;  //!< Pointer to interface.
+    nrf_log_backend_t *           p_next; //!< Pointer to next backend added to the logger.
+    uint8_t                       id;     //!< Backend id.
+    bool                          enabled;//!< Flag indicating backend status.
+};
+
+/**
+ * @brief Function for putting message with log entry to the backend.
+ *
+ * @param[in] p_backend  Pointer to the backend instance.
+ * @param[in] p_msg      Pointer to message with log entry.
+ */
+__STATIC_INLINE void nrf_log_backend_put(nrf_log_backend_t const * p_backend,
+                                         nrf_log_entry_t * p_msg);
+
+/**
+ * @brief Function for reconfiguring backend to panic mode.
+ *
+ * @param[in] p_backend  Pointer to the backend instance.
+ */
+__STATIC_INLINE void nrf_log_backend_panic_set(nrf_log_backend_t const * p_backend);
+
+/**
+ * @brief Function for flushing backend.
+ *
+ *        On flushing request backend should release log message(s).
+ *
+ * @param[in] p_backend  Pointer to the backend instance.
+ */
+__STATIC_INLINE void nrf_log_backend_flush(nrf_log_backend_t const * p_backend);
+
+
+/**
+ * @brief Function for setting backend id.
+ *
+ * @note It is used internally by the logger.
+ *
+ * @param[in] p_backend  Pointer to the backend instance.
+ * @param[in] id         Id.
+ */
+__STATIC_INLINE void nrf_log_backend_id_set(nrf_log_backend_t * p_backend, uint8_t id);
+
+/**
+ * @brief Function for getting backend id.
+ *
+ * @note It is used internally by the logger.
+ *
+ * @param[in] p_backend  Pointer to the backend instance.
+ * @return    Id.
+ */
+__STATIC_INLINE uint8_t nrf_log_backend_id_get(nrf_log_backend_t const * p_backend);
+
+/**
+ * @brief Function for enabling backend.
+ *
+ * @param[in] p_backend  Pointer to the backend instance.
+ */
+__STATIC_INLINE void nrf_log_backend_enable(nrf_log_backend_t * p_backend);
+
+/**
+ * @brief Function for disabling backend.
+ *
+ * @param[in] p_backend  Pointer to the backend instance.
+ */
+__STATIC_INLINE void nrf_log_backend_disable(nrf_log_backend_t * p_backend);
+
+/**
+ * @brief Function for checking state of the backend.
+ *
+ * @param[in] p_backend  Pointer to the backend instance.
+ *
+ * @return True if backend is enabled, false otherwise.
+ */
+__STATIC_INLINE bool nrf_log_backend_is_enabled(nrf_log_backend_t const * p_backend);
+
+#ifndef SUPPRESS_INLINE_IMPLEMENTATION
+__STATIC_INLINE void nrf_log_backend_put(nrf_log_backend_t const * p_backend,
+                                         nrf_log_entry_t * p_msg)
+{
+    p_backend->p_api->put(p_backend, p_msg);
+}
+
+__STATIC_INLINE void nrf_log_backend_panic_set(nrf_log_backend_t const * p_backend)
+{
+    p_backend->p_api->panic_set(p_backend);
+}
+
+__STATIC_INLINE void nrf_log_backend_flush(nrf_log_backend_t const * p_backend)
+{
+    p_backend->p_api->flush(p_backend);
+}
+
+__STATIC_INLINE void nrf_log_backend_id_set(nrf_log_backend_t * p_backend, uint8_t id)
+{
+    p_backend->id = id;
+}
+
+__STATIC_INLINE uint8_t nrf_log_backend_id_get(nrf_log_backend_t const * p_backend)
+{
+    return p_backend->id;
+}
+
+__STATIC_INLINE void nrf_log_backend_enable(nrf_log_backend_t * p_backend)
+{
+    p_backend->enabled = true;
+}
+
+__STATIC_INLINE void nrf_log_backend_disable(nrf_log_backend_t * p_backend)
+{
+    p_backend->enabled = false;
+}
+
+__STATIC_INLINE bool nrf_log_backend_is_enabled(nrf_log_backend_t const * p_backend)
+{
+    return p_backend->enabled;
+}
+
+#endif // SUPPRESS_INLINE_IMPLEMENTATION
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif //NRF_LOG_BACKEND_INTERFACE_H
+
+/** @} */