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
   *    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 NRFX_RNG_H__
  #define NRFX_RNG_H__
  
  #include <nrfx.h>
  #include <hal/nrf_rng.h>
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /**
   * @defgroup nrfx_rng RNG driver
   * @{
   * @ingroup nrf_rng
   * @brief   Random Number Generator (RNG) peripheral driver.
   */
  
  /**
   * @brief Struct for RNG configuration.
   */
  typedef struct
  {
      bool     error_correction : 1;  /**< Error correction flag. */
      uint8_t  interrupt_priority;    /**< interrupt priority */
  } nrfx_rng_config_t;
  
  /**
   * @brief RNG default configuration.
   *        Basic usage:
   *        @code
   *            nrfx_rng_config_t config = NRFX_RNG_DEFAULT_CONFIG;
   *            if (nrfx_rng_init(&config, handler)
   *            { ...
   *        @endcode
   */
  #define NRFX_RNG_DEFAULT_CONFIG                                 \
      {                                                           \
          .error_correction   = NRFX_RNG_CONFIG_ERROR_CORRECTION, \
          .interrupt_priority = NRFX_RNG_CONFIG_IRQ_PRIORITY,     \
      }
  
  /**
   * @brief RNG driver event handler type.
   */
  typedef void (* nrfx_rng_evt_handler_t)(uint8_t rng_data);
  
  /**
   * @brief Function for initializing the nrfx_rng module.
   *
   * @param[in]  p_config Pointer to the structure with initial configuration.
   * @param[in]  handler  Event handler provided by the user. Must not be NULL.
   *
   * @retval  NRFX_SUCCESS                   Driver was successfully initialized.
   * @retval  NRFX_ERROR_ALREADY_INITIALIZED Driver was already initialized.
   */
  nrfx_err_t nrfx_rng_init(nrfx_rng_config_t const * p_config, nrfx_rng_evt_handler_t handler);
  
  /**
   * @brief Function for starting the random value generation.
   *
   * Function enables interrupts in perihperal and start them.
   */
  void nrfx_rng_start(void);
  
  /**
   * @brief Function for stoping the random value generation.
   *
   * Function disables interrupts in perihperal and stop generation of new random values.
   */
  void nrfx_rng_stop(void);
  
  /**
   * @brief Function for uninitializing the nrfx_rng module.
   */
  void nrfx_rng_uninit(void);
  
  
  void nrfx_rng_irq_handler(void);
  
  
  /** @} */
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif // NRFX_RNG_H__
  