text: /* 
   * Copyright (c) 2015 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 or object form under this license must not be reverse 
   *      engineered, decompiled, modified and/or disassembled. 
   * 
   * 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 SYSTEM_NRF52_H
  #define SYSTEM_NRF52_H
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  #include <stdint.h>
  
  
  extern uint32_t SystemCoreClock;    /*!< System Clock Frequency (Core Clock)  */
  
  /**
   * Initialize the system
   *
   * @param  none
   * @return none
   *
   * @brief  Setup the microcontroller system.
   *         Initialize the System and update the SystemCoreClock variable.
   */
  extern void SystemInit (void);
  
  /**
   * Update SystemCoreClock variable
   *
   * @param  none
   * @return none
   *
   * @brief  Updates the SystemCoreClock with current core Clock
   *         retrieved from cpu registers.
   */
  extern void SystemCoreClockUpdate (void);
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* SYSTEM_NRF52_H */
  