text: /**
   * Copyright (c) 2016 - 2019, 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
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   *    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
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  /**@file
   *
   * @defgroup nrf_dfu_settings DFU settings
   * @{
   * @ingroup  nrf_dfu
   */
  
  #ifndef NRF_DFU_SETTINGS_H__
  #define NRF_DFU_SETTINGS_H__
  
  #include <stdint.h>
  #include "nrf_dfu_types.h"
  #include "nrf_dfu_flash.h"
  #include "sdk_config.h"
  #include "sdk_errors.h"
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  
  /**@brief   Global settings.
   *
   * @note Using this variable is not thread-safe.
   *
   */
  extern nrf_dfu_settings_t s_dfu_settings;
  
  
  /**@brief   Function for writing DFU settings to flash.
   *
   * @param[in]   callback    Pointer to a function that is called after completing the write operation.
   *
   * @retval  NRF_SUCCESS         If the write process was successfully initiated.
   * @retval  NRF_ERROR_INTERNAL  If a flash error occurred.
   */
  ret_code_t nrf_dfu_settings_write(nrf_dfu_flash_callback_t callback);
  
  
  /**@brief   Function for backing up the settings.
   *
   * This function copies the contents of the settings page (in flash) to a separate page (in flash).
   * During @ref nrf_dfu_settings_init, the backup is restored if the original is invalid.
   *
   * @param[in]   callback    Pointer to a function that is called after completing the write operation.
   */
  void nrf_dfu_settings_backup(nrf_dfu_flash_callback_t callback);
  
  
  /**@brief   Function for writing DFU settings to flash and to backup.
   *
   * This function first calls @ref nrf_dfu_settings_write and then @ref nrf_dfu_settings_backup.
   *
   * @param[in]   callback    Pointer to a function that is called after completing the write and backup operation.
   *
   * @retval  NRF_SUCCESS         If the write process was successfully initiated.
   * @retval  NRF_ERROR_INTERNAL  If a flash error occurred during the first write.
   */
  ret_code_t nrf_dfu_settings_write_and_backup(nrf_dfu_flash_callback_t callback);
  
  
  /**@brief   Function for initializing the DFU settings module.
   *
   * @retval  NRF_SUCCESS         If the initialization was successful.
   * @retval  NRF_ERROR_INTERNAL  If a flash error occurred.
   */
  ret_code_t nrf_dfu_settings_init(bool sd_irq_initialized);
  
  
  #if defined(NRF_DFU_TRANSPORT_BLE) && NRF_DFU_TRANSPORT_BLE
  /** @brief Function for storing peer data received through an SVCI call in DFU settings.
   *
   * @note The content of the type can be verified by a CRC value stored inside the struct
   *       If the CRC value is 0xFFFFFFFF, it means that no data is set.
   *
   * @note The storage operation is an asynchronous progress. Success will be notified
   *       through system events raised by the SoftDevice.
   *
   * @param[in]   p_data  Peer data to be stored in flash.
   *
   * @retval  NRF_SUCCESS     Asynchronous operation was successfully started.
   * @retval  NRF_ERROR_NULL  p_data was NULL.
   * @retval  Any other error code reported by SoftDevice API calls.
   */
  ret_code_t nrf_dfu_settings_peer_data_write(nrf_dfu_peer_data_t * p_data);
  
  
  /** @brief Function for copying peer data from DFU settings to RAM.
   *
   * @param[in,out] p_data    Structure to copy peer data to.
   *
   * @retval  NRF_SUCCESS     Peer data was successfully copied.
   * @retval  NRF_ERROR_NULL  p_data was NULL.
   */
  ret_code_t nrf_dfu_settings_peer_data_copy(nrf_dfu_peer_data_t * p_data);
  
  
  /** @brief Function for validating peer data in DFU settings.
   *
   * @retval  True if peer data is validated by CRC, false if not.
   */
  bool nrf_dfu_settings_peer_data_is_valid(void);
  
  
  /** @brief Function for storing an advertisement name received through an SVCI call in DFU settings.
   *
   * @note The content of the type is verifyable by a CRC-value stored inside the struct.
   *
   * @note The storage operation is an asynchronous progress. Success will be notified
   *       through system events raised by the SoftDevice.
   *
   * @param[in]   p_adv_name  Structure holding information about the new advertisement name.
   *
   * @retval  NRF_SUCCESS     Asynchronous operation was successfully started.
   * @retval  NRF_ERROR_NULL  p_adv_name was NULL.
   * @retval  Any other error code reported by SoftDevice API calls.
   */
  ret_code_t nrf_dfu_settings_adv_name_write(nrf_dfu_adv_name_t * p_adv_name);
  
  
  /** @brief Function for copying the advertisement name from DFU settings to RAM.
   *
   * @param[in,out]   p_adv_name  Structure to copy the new advertisement name to.
   *
   * @retval  NRF_SUCCESS     Advertisement name was successfully copied.
   * @retval  NRF_ERROR_NULL  p_adv_name was NULL.
   */
  ret_code_t nrf_dfu_settings_adv_name_copy(nrf_dfu_adv_name_t * p_adv_name);
  
  
  /** @brief Function for validating advertisement data in DFU settings.
   *
   * @retval  True if advertisement name is validated by CRC, false if not.
   */
  bool nrf_dfu_settings_adv_name_is_valid(void);
  
  #endif // NRF_DFU_TRANSPORT_BLE
  
  /** @brief Function for erasing additional data in DFU settings.
   *
   * @note    Erasing additional data in DFU settings is only possible
   *          if nrf_dfu_flash is initialized to not use SoftDevice calls.
   *
   * @retval  NRF_SUCCESS     Additional data was successfully erased.
   * @retval  Any other error code reported by nrf_dfu_flash
   */
  ret_code_t nrf_dfu_settings_additional_erase(void);
  
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif // NRF_DFU_SETTINGS_H__
  
  /**@} */
  