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diff --git a/drivers_nrf/sdk_errors.h b/drivers_nrf/sdk_errors.h
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+/**
+ * Copyright (c) 2013 - 2017, 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.
+ * 
+ */
+/**@file
+ *
+ * @defgroup sdk_error SDK Error codes
+ * @{
+ * @ingroup app_common
+ * @{
+ * @details Error codes are 32-bit unsigned integers with the most significant 16-bit reserved for
+ *          identifying the module where the error occurred while the least least significant LSB
+ *          are used to provide the cause or nature of error. Each module is assigned a 16-bit
+ *          unsigned integer. Which it will use to identify all errors that occurred in it. 16-bit
+ *          LSB range is with module id as the MSB in the 32-bit error code is reserved for the
+ *          module. As an example, if 0x8800 identifies a certain SDK module, all values from
+ *          0x88000000 - 0x8800FFFF are reserved for this module.
+ *          It should be noted that common error reasons have been assigned values to make it
+ *          possible to decode error reason easily. As an example, lets module uninitialized has
+ *          been assigned an error code 0x000A0. Then, if application encounters an error code
+ *          0xZZZZ00A0, it knows that it accessing a certain module without initializing it.
+ *          Apart from this, each module is allowed to define error codes that are not covered by
+ *          the common ones, however, these values are defined in a range that does not conflict
+ *          with common error values. For module, specific error however, it is possible that the
+ *          same error value is used by two different modules to indicated errors of very different
+ *          nature. If error is already defined by the NRF common error codes, these are reused.
+ *          A range is reserved for application as well, it can use this range for defining
+ *          application specific errors.
+ *
+ * @note Success code, NRF_SUCCESS, does not include any module identifier.
+
+ */
+
+#ifndef SDK_ERRORS_H__
+#define SDK_ERRORS_H__
+
+#include <stdint.h>
+#include "nrf_error.h"
+#include "sdk_config.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @defgroup sdk_err_base Base defined for SDK Modules
+ * @{
+ */
+#define NRF_ERROR_SDK_ERROR_BASE         (NRF_ERROR_BASE_NUM + 0x8000)   /**< Base value defined for SDK module identifiers. */
+#define NRF_ERROR_SDK_COMMON_ERROR_BASE  (NRF_ERROR_BASE_NUM + 0x0080)   /**< Base error value to be used for SDK error values. */
+/** @} */
+
+/**
+ * @defgroup sdk_module_codes Codes reserved as identification for module where the error occurred.
+ * @{
+ */
+#define NRF_ERROR_MEMORY_MANAGER_ERR_BASE   (0x8100)
+#define NRF_ERROR_PERIPH_DRIVERS_ERR_BASE   (0x8200)
+#define NRF_ERROR_GAZELLE_ERR_BASE          (0x8300)
+/** @} */
+
+
+/**
+ * @defgroup sdk_iot_errors Codes reserved as identification for IoT errors.
+ * @{
+ */
+#define NRF_ERROR_IOT_ERR_BASE_START        (0xA000)
+#define NRF_ERROR_IOT_ERR_BASE_STOP         (0xAFFF)
+/** @} */
+
+
+/**
+ * @defgroup sdk_common_errors Codes reserved as identification for common errors.
+ * @{
+ */
+#define NRF_ERROR_MODULE_NOT_INITIALZED      (NRF_ERROR_SDK_COMMON_ERROR_BASE + 0x0000)
+#define NRF_ERROR_MUTEX_INIT_FAILED          (NRF_ERROR_SDK_COMMON_ERROR_BASE + 0x0001)
+#define NRF_ERROR_MUTEX_LOCK_FAILED          (NRF_ERROR_SDK_COMMON_ERROR_BASE + 0x0002)
+#define NRF_ERROR_MUTEX_UNLOCK_FAILED        (NRF_ERROR_SDK_COMMON_ERROR_BASE + 0x0003)
+#define NRF_ERROR_MUTEX_COND_INIT_FAILED     (NRF_ERROR_SDK_COMMON_ERROR_BASE + 0x0004)
+#define NRF_ERROR_MODULE_ALREADY_INITIALIZED (NRF_ERROR_SDK_COMMON_ERROR_BASE + 0x0005)
+#define NRF_ERROR_STORAGE_FULL               (NRF_ERROR_SDK_COMMON_ERROR_BASE + 0x0006)
+#define NRF_ERROR_API_NOT_IMPLEMENTED        (NRF_ERROR_SDK_COMMON_ERROR_BASE + 0x0010)
+#define NRF_ERROR_FEATURE_NOT_ENABLED        (NRF_ERROR_SDK_COMMON_ERROR_BASE + 0x0011)
+/** @} */
+
+
+/**
+ * @defgroup drv_specific_errors Error / status codes specific to drivers.
+ * @{
+ */
+#define NRF_ERROR_DRV_TWI_ERR_OVERRUN              (NRF_ERROR_PERIPH_DRIVERS_ERR_BASE + 0x0000)
+#define NRF_ERROR_DRV_TWI_ERR_ANACK                (NRF_ERROR_PERIPH_DRIVERS_ERR_BASE + 0x0001)
+#define NRF_ERROR_DRV_TWI_ERR_DNACK                (NRF_ERROR_PERIPH_DRIVERS_ERR_BASE + 0x0002)
+/** @} */
+
+/**
+ * @brief API Result.
+ *
+ * @details Indicates success or failure of an API procedure. In case of failure, a comprehensive
+ *          error code indicating cause or reason for failure is provided.
+ *
+ *          Though called an API result, it could used in Asynchronous notifications callback along
+ *          with asynchronous callback as event result. This mechanism is employed when an event
+ *          marks the end of procedure initiated using API. API result, in this case, will only be
+ *          an indicative of whether the procedure has been requested successfully.
+ */
+typedef uint32_t ret_code_t;
+
+/** @} */
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // SDK_ERRORS_H__