tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_NORDIC/TARGET_MCU_NRF51822/system_nrf51.h

   1 /* Copyright (c) 2013, Nordic Semiconductor ASA
   2  * All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are met:
   6  *
   7  *   * Redistributions of source code must retain the above copyright notice, this
   8  *     list of conditions and the following disclaimer.
   9  *
  10  *   * Redistributions in binary form must reproduce the above copyright notice,
  11  *     this list of conditions and the following disclaimer in the documentation
  12  *     and/or other materials provided with the distribution.
  13  *
  14  *   * Neither the name of Nordic Semiconductor ASA nor the names of its
  15  *     contributors may be used to endorse or promote products derived from
  16  *     this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  25  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  26  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  27  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *
  29  */
  30 #ifndef SYSTEM_NRF51_H
  31 #define SYSTEM_NRF51_H
  32
  33 #ifdef __cplusplus
  34 extern "C" {
  35 #endif
  36
  37 #include <stdint.h>
  38
  39
  40 extern uint32_t SystemCoreClock;    /*!< System Clock Frequency (Core Clock)  */
  41
  42 /**
  43  * Initialize the system
  44  *
  45  * @param  none
  46  * @return none
  47  *
  48  * @brief  Setup the microcontroller system.
  49  *         Initialize the System and update the SystemCoreClock variable.
  50  */
  51 extern void SystemInit (void);
  52
  53 /**
  54  * Update SystemCoreClock variable
  55  *
  56  * @param  none
  57  * @return none
  58  *
  59  * @brief  Updates the SystemCoreClock with current core Clock
  60  *         retrieved from cpu registers.
  61  */
  62 extern void SystemCoreClockUpdate (void);
  63
  64 #ifdef __cplusplus
  65 }
  66 #endif
  67
  68 #endif /* SYSTEM_NRF51_H */