system_nrf51.h

00001 /* Copyright (c) 2015, Nordic Semiconductor ASA
00002  * All rights reserved.
00003  *
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions are met:
00006  *
00007  *   * Redistributions of source code must retain the above copyright notice, this
00008  *     list of conditions and the following disclaimer.
00009  *
00010  *   * Redistributions in binary form must reproduce the above copyright notice,
00011  *     this list of conditions and the following disclaimer in the documentation
00012  *     and/or other materials provided with the distribution.
00013  *
00014  *   * Neither the name of Nordic Semiconductor ASA nor the names of its
00015  *     contributors may be used to endorse or promote products derived from
00016  *     this software without specific prior written permission.
00017  *
00018  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00019  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00020  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00021  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
00022  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00023  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
00024  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
00025  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00026  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
00027  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00028  *
00029  */
00030 
00031 #ifndef SYSTEM_NRF51_H
00032 #define SYSTEM_NRF51_H
00033 
00034 #ifdef __cplusplus
00035 extern "C" {
00036 #endif
00037 
00038 #include <stdint.h>
00039 
00040 
00041 extern uint32_t SystemCoreClock;    /*!< System Clock Frequency (Core Clock)  */
00042 
00043 /**
00044  * Initialize the system
00045  *
00046  * @param  none
00047  * @return none
00048  *
00049  * @brief  Setup the microcontroller system.
00050  *         Initialize the System and update the SystemCoreClock variable.
00051  */
00052 extern void SystemInit (void);
00053 
00054 /**
00055  * Update SystemCoreClock variable
00056  *
00057  * @param  none
00058  * @return none
00059  *
00060  * @brief  Updates the SystemCoreClock with current core Clock 
00061  *         retrieved from cpu registers.
00062  */
00063 extern void SystemCoreClockUpdate (void);
00064 
00065 #ifdef __cplusplus
00066 }
00067 #endif
00068 
00069 #endif /* SYSTEM_NRF51_H */
00070