text: /*
  
  Copyright (c) 2009-2018 ARM Limited. All rights reserved.
  
      SPDX-License-Identifier: Apache-2.0
  
  Licensed under the Apache License, Version 2.0 (the License); you may
  not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
      www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an AS IS BASIS, WITHOUT
  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  
  NOTICE: This file has been modified by Nordic Semiconductor ASA.
  
  */
  
  #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 */
  