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diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/usbd/app_usbd_string_desc.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/usbd/app_usbd_string_desc.c
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--- /dev/null
+++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/usbd/app_usbd_string_desc.c
@@ -0,0 +1,188 @@
+/**
+ * Copyright (c) 2016 - 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.
+ * 
+ */
+#include "sdk_config.h"
+#if APP_USBD_ENABLED
+#include "app_usbd_string_desc.h"
+#include "app_usbd_langid.h"
+#include "app_usbd_core.h"
+#include "nordic_common.h"
+
+/**
+ * @defgroup app_usbd_string_desc
+ * @ingroup app_usbd
+ *
+ * USBD string descriptors management
+ * @{
+ */
+
+/**
+ * @brief Array with language identifiers
+ *
+ * This array would be used to search the proper string for selected language.
+ */
+static const uint16_t m_langids[] = { APP_USBD_STRINGS_LANGIDS };
+
+/**
+ * @brief Language ID descriptor
+ *
+ * Language
+ */
+
+
+/**
+ * @brief Mnemonics for the string positions in the array
+ *
+ * The mnemonics for the indexes of the strings inside the string array.
+ */
+enum {
+    APP_USBD_STRING_ID_LANGIDS_ARRAY_POS = 0,  /**< Supported language identifiers */
+    APP_USBD_STRING_ID_MANUFACTURER_ARRAY_POS, /**< Manufacturer name */
+    APP_USBD_STRING_ID_PRODUCT_ARRAY_POS,      /**< Product name */
+    APP_USBD_STRING_ID_SERIAL_ARRAY_POS,       /**< Serial number */
+#define X(mnemonic, str_idx, ...) CONCAT_2(mnemonic, _ARRAY_POS),
+    APP_USBD_STRINGS_USER
+#undef X
+};
+
+/**
+ * @brief String index into internal array index conversion table
+ *
+ * The array that transforms the USB string indexes into internal array position.
+ * @note Value 0 used to mark non-existing string.
+ */
+static const uint8_t m_string_translation[APP_USBD_STRING_ID_CNT] =
+{
+    [APP_USBD_STRING_ID_LANGIDS     ] = APP_USBD_STRING_ID_LANGIDS_ARRAY_POS,
+    [APP_USBD_STRING_ID_MANUFACTURER] = APP_USBD_STRING_ID_MANUFACTURER_ARRAY_POS,
+    [APP_USBD_STRING_ID_PRODUCT     ] = APP_USBD_STRING_ID_PRODUCT_ARRAY_POS,
+    [APP_USBD_STRING_ID_SERIAL      ] = APP_USBD_STRING_ID_SERIAL_ARRAY_POS,
+#define X(mnemonic, str_idx, ...) [mnemonic] = CONCAT_2(mnemonic, _ARRAY_POS),
+    APP_USBD_STRINGS_USER
+#undef X
+};
+
+#ifndef APP_USBD_STRINGS_MANUFACTURER_EXTERN
+#define APP_USBD_STRINGS_MANUFACTURER_EXTERN 0
+#endif
+
+#ifndef APP_USBD_STRINGS_PRODUCT_EXTERN
+#define APP_USBD_STRINGS_PRODUCT_EXTERN 0
+#endif
+
+#ifndef APP_USBD_STRING_SERIAL_EXTERN
+#define APP_USBD_STRING_SERIAL_EXTERN 0
+#endif
+
+#if APP_USBD_STRINGS_MANUFACTURER_EXTERN
+extern uint16_t APP_USBD_STRINGS_MANUFACTURER[];
+#endif
+
+#if APP_USBD_STRINGS_PRODUCT_EXTERN
+extern uint16_t APP_USBD_STRINGS_PRODUCT[];
+#endif
+
+#if APP_USBD_STRING_SERIAL_EXTERN
+extern uint16_t APP_USBD_STRING_SERIAL[];
+#endif
+
+
+/**
+ * @brief String descriptors table
+ * */
+static const uint16_t * m_string_dsc[APP_USBD_STRING_ID_CNT][ARRAY_SIZE(m_langids)] =
+{
+    [APP_USBD_STRING_ID_LANGIDS_ARRAY_POS]      = { APP_USBD_STRING_DESC(APP_USBD_STRINGS_LANGIDS) },
+    [APP_USBD_STRING_ID_MANUFACTURER_ARRAY_POS] = { APP_USBD_STRINGS_MANUFACTURER },
+    [APP_USBD_STRING_ID_PRODUCT_ARRAY_POS]      = { APP_USBD_STRINGS_PRODUCT },
+    [APP_USBD_STRING_ID_SERIAL_ARRAY_POS]       = { APP_USBD_STRING_SERIAL },
+#define X(mnemonic, str_idx, ...) [CONCAT_2(mnemonic, _ARRAY_POS)] = { __VA_ARGS__ },
+    APP_USBD_STRINGS_USER
+#undef X
+};
+
+
+
+uint16_t const * app_usbd_string_desc_get(app_usbd_string_desc_idx_t idx, uint16_t langid)
+{
+    /* LANGID string */
+    if (APP_USBD_STRING_ID_LANGIDS == idx)
+    {
+        return m_string_dsc[APP_USBD_STRING_ID_LANGIDS_ARRAY_POS][0];
+    }
+
+    /* Searching for the language */
+    uint8_t lang_idx = 0;
+    if (ARRAY_SIZE(m_langids) > 1)
+    {
+        while (m_langids[lang_idx] != langid)
+        {
+            if (++lang_idx >= ARRAY_SIZE(m_langids))
+            {
+                return NULL;
+            }
+        }
+    }
+
+    /* Get the string index in array */
+    if (idx >= ARRAY_SIZE(m_string_translation))
+    {
+        return NULL;
+    }
+
+    uint8_t str_pos = m_string_translation[idx];
+    if (str_pos == 0)
+    {
+        return NULL;
+    }
+
+    uint16_t const * p_str = m_string_dsc[str_pos][lang_idx];
+    if ((ARRAY_SIZE(m_langids) > 1) && (lang_idx != 0))
+    {
+        if (p_str == NULL)
+        {
+            p_str = m_string_dsc[str_pos][0];
+        }
+    }
+
+    return p_str;
+}
+
+/** @} */
+#endif // APP_USBD_ENABLED