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 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 the copyright holder nor the names of its
   *    contributors may be used to endorse or promote products derived from this
   *    software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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
   *
   * This configuration sets up randon number generator with the following options:
   * - error correction enabled
   */
  #define NRFX_RNG_DEFAULT_CONFIG                                  \
  {                                                                \
      .error_correction   = true,                                  \
      .interrupt_priority = NRFX_RNG_DEFAULT_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 the 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 generation of random values.
   *
   * New data should be handled by handler passed to the @ref nrfx_rng_init() function.
   */
  void nrfx_rng_start(void);
  
  /**
   * @brief Function for stopping the generation of random values.
   *
   * Function disables interrupts in peripheral and stops the 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__
  