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diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/integration/nrfx/legacy/nrf_drv_pdm.h b/thirdparty/nRF5_SDK_15.0.0_a53641a/integration/nrfx/legacy/nrf_drv_pdm.h
new file mode 100644
index 0000000..c7baac3
--- /dev/null
+++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/integration/nrfx/legacy/nrf_drv_pdm.h
@@ -0,0 +1,116 @@
+/**
+ * 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_PDM_H__
+#define NRF_DRV_PDM_H__
+
+#include <nrfx_pdm.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @defgroup nrf_drv_pdm PDM driver - legacy layer
+ * @{
+ * @ingroup  nrf_pdm
+ *
+ * @brief    @tagAPI52 Layer providing compatibility with the former API.
+ */
+
+/** @brief Type definition for forwarding the new implementation. */
+typedef nrfx_pdm_config_t   nrf_drv_pdm_config_t;
+/** @brief Type definition for forwarding the new implementation. */
+typedef nrfx_pdm_evt_t      nrf_drv_pdm_evt_t;
+
+/** @brief Macro for forwarding the new implementation. */
+#define NRF_PDM_MAX_BUFFER_SIZE         NRFX_PDM_MAX_BUFFER_SIZE
+/** @brief Macro for forwarding the new implementation. */
+#define NRF_DRV_PDM_DEFAULT_CONFIG      NRFX_PDM_DEFAULT_CONFIG
+
+/** @brief Macro for forwarding the new implementation. */
+#define PDM_NO_ERROR                    NRFX_PDM_NO_ERROR
+/** @brief Macro for forwarding the new implementation. */
+#define PDM_ERROR_OVERFLOW              NRFX_PDM_ERROR_OVERFLOW
+/** @brief Macro for forwarding the new implementation. */
+#define nrf_drv_pdm_error_t             nrfx_pdm_error_t
+/** @brief Macro for forwarding the new implementation. */
+#define nrf_drv_pdm_event_handler_t     nrfx_pdm_event_handler_t
+
+/** @brief Macro for forwarding the new implementation. */
+#define nrf_drv_pdm_uninit              nrfx_pdm_uninit
+/** @brief Macro for forwarding the new implementation. */
+#define nrf_drv_pdm_task_address_get    nrfx_pdm_task_address_get
+/** @brief Macro for forwarding the new implementation. */
+#define nrf_drv_pdm_enable_check        nrfx_pdm_enable_check
+/** @brief Macro for forwarding the new implementation. */
+#define nrf_drv_pdm_start               nrfx_pdm_start
+/** @brief Macro for forwarding the new implementation. */
+#define nrf_drv_pdm_stop                nrfx_pdm_stop
+/** @brief Macro for forwarding the new implementation. */
+#define nrf_drv_pdm_buffer_set          nrfx_pdm_buffer_set
+
+/**
+ * @brief Function for initializing the PDM interface.
+ *
+ * @param[in] p_config      Pointer to the structure with initial configuration. Cannot be NULL.
+ * @param[in] event_handler Event handler provided by the user. Cannot be NULL.
+ *
+ * @retval NRF_SUCCESS If initialization was successful.
+ * @retval NRF_ERROR_INVALID_STATE If the driver is already initialized.
+ * @retval NRF_ERROR_INVALID_PARAM If invalid parameters were specified.
+ */
+__STATIC_INLINE ret_code_t nrf_drv_pdm_init(nrf_drv_pdm_config_t const * p_config,
+                                            nrf_drv_pdm_event_handler_t  event_handler)
+{
+    if (p_config == NULL)
+    {
+        return NRFX_ERROR_INVALID_PARAM;
+    }
+    return nrfx_pdm_init(p_config, event_handler);
+}
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // NRF_DRV_PDM_H__