system_nrf51.h

00001 /* Copyright (c) 2013, 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 #ifndef SYSTEM_NRF51_H
00031 #define SYSTEM_NRF51_H
00032 
00033 #ifdef __cplusplus
00034 extern "C" {
00035 #endif
00036 
00037 #include <stdint.h>
00038 
00039 
00040 extern uint32_t SystemCoreClock;    /*!< System Clock Frequency (Core Clock)  */
00041 
00042 /**
00043  * Initialize the system
00044  *
00045  * @param  none
00046  * @return none
00047  *
00048  * @brief  Setup the microcontroller system.
00049  *         Initialize the System and update the SystemCoreClock variable.
00050  */
00051 extern void SystemInit (void);
00052 
00053 /**
00054  * Update SystemCoreClock variable
00055  *
00056  * @param  none
00057  * @return none
00058  *
00059  * @brief  Updates the SystemCoreClock with current core Clock 
00060  *         retrieved from cpu registers.
00061  */
00062 extern void SystemCoreClockUpdate (void);
00063 
00064 #ifdef __cplusplus
00065 }
00066 #endif
00067 
00068 #endif /* SYSTEM_NRF51_H */