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diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/integration/nrfx/legacy/nrf_drv_i2s.h b/thirdparty/nRF5_SDK_15.0.0_a53641a/integration/nrfx/legacy/nrf_drv_i2s.h
new file mode 100644
index 0000000..56f2743
--- /dev/null
+++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/integration/nrfx/legacy/nrf_drv_i2s.h
@@ -0,0 +1,110 @@
+/**
+ * Copyright (c) 2015 - 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_DRV_I2S_H__
+#define NRF_DRV_I2S_H__
+
+#include <nrfx_i2s.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @defgroup nrf_drv_i2s I2S driver - legacy layer
+ * @{
+ * @ingroup  nrf_i2s
+ *
+ * @brief    @tagAPI52 Layer providing compatibility with the former API.
+ */
+
+/** @brief Type definition for forwarding the new implementation. */
+typedef nrfx_i2s_config_t   nrf_drv_i2s_config_t;
+/** @brief Type definition for forwarding the new implementation. */
+typedef nrfx_i2s_buffers_t  nrf_drv_i2s_buffers_t;
+
+/** @brief Macro for forwarding the new implementation. */
+#define NRF_DRV_I2S_PIN_NOT_USED            NRFX_I2S_PIN_NOT_USED
+/** @brief Macro for forwarding the new implementation. */
+#define NRF_DRV_I2S_FLAG_SYNCHRONIZED_MODE  NRFX_I2S_FLAG_SYNCHRONIZED_MODE
+/** @brief Macro for forwarding the new implementation. */
+#define NRF_DRV_I2S_DEFAULT_CONFIG          NRFX_I2S_DEFAULT_CONFIG
+/** @brief Macro for forwarding the new implementation. */
+#define nrf_drv_i2s_data_handler_t          nrfx_i2s_data_handler_t
+
+/** @brief Macro for forwarding the new implementation. */
+#define nrf_drv_i2s_uninit                  nrfx_i2s_uninit
+/** @brief Macro for forwarding the new implementation. */
+#define nrf_drv_i2s_start                   nrfx_i2s_start
+/** @brief Macro for forwarding the new implementation. */
+#define nrf_drv_i2s_next_buffers_set        nrfx_i2s_next_buffers_set
+/** @brief Macro for forwarding the new implementation. */
+#define nrf_drv_i2s_stop                    nrfx_i2s_stop
+
+/**
+ * @brief Function for initializing the I2S driver.
+ *
+ * @param[in] p_config Pointer to the structure with initial configuration.
+ *                     If NULL, the default configuration is used.
+ * @param[in] handler  Data handler provided by the user. Must not be NULL.
+ *
+ * @retval NRF_SUCCESS             If initialization was successful.
+ * @retval NRF_ERROR_INVALID_STATE If the driver was already initialized.
+ * @retval NRF_ERROR_INVALID_PARAM If the requested combination of configuration
+  *                                 options is not allowed by the I2S peripheral.
+ */
+__STATIC_INLINE ret_code_t nrf_drv_i2s_init(nrf_drv_i2s_config_t const * p_config,
+                                            nrf_drv_i2s_data_handler_t   handler)
+{
+    if (p_config == NULL)
+    {
+        static nrfx_i2s_config_t const default_config = NRFX_I2S_DEFAULT_CONFIG;
+        p_config = &default_config;
+    }
+    return nrfx_i2s_init(p_config, handler);
+}
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // NRF_DRV_I2S_H__