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103 lines
3.4 KiB
C
103 lines
3.4 KiB
C
/**************************************************************************//**
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* @file system_ARMCM7.c
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* @brief CMSIS Device System Source File for
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* ARMCM7 Device Series
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* @version V1.00
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* @date 27. August 2014
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*
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* @note
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*
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******************************************************************************/
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/* Copyright (c) 2011 - 2014 ARM LIMITED
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of ARM nor the names of its contributors may be used
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to endorse or promote products derived from this software without
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specific prior written permission.
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*
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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---------------------------------------------------------------------------*/
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#if defined (ARMCM7)
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#include "ARMCM7.h"
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#elif defined (ARMCM7_SP)
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#include "ARMCM7_SP.h"
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#elif defined (ARMCM7_DP)
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#include "ARMCM7_DP.h"
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#else
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#error device not specified!
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#endif
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/*----------------------------------------------------------------------------
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Define clocks
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*----------------------------------------------------------------------------*/
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#define __HSI ( 8000000UL)
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#define __XTAL ( 5000000UL) /* Oscillator frequency */
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#define __SYSTEM_CLOCK (5*__XTAL)
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/*----------------------------------------------------------------------------
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System Core Clock Variable
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*----------------------------------------------------------------------------*/
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uint32_t SystemCoreClock = __SYSTEM_CLOCK;/* System Core Clock Frequency */
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/**
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* Update SystemCoreClock variable
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*
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* @param none
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* @return none
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*
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* @brief Updates the SystemCoreClock with current core Clock
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* retrieved from cpu registers.
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*/
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void SystemCoreClockUpdate (void)
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{
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SystemCoreClock = __SYSTEM_CLOCK;
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}
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/**
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* Initialize the system
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*
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* @param none
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* @return none
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*
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* @brief Setup the microcontroller system.
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* Initialize the System.
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*/
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void SystemInit (void)
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{
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#if (__FPU_USED == 1)
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SCB->CPACR |= ((3UL << 10*2) | /* set CP10 Full Access */
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(3UL << 11*2) ); /* set CP11 Full Access */
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#endif
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#ifdef UNALIGNED_SUPPORT_DISABLE
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SCB->CCR |= SCB_CCR_UNALIGN_TRP_Msk;
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#endif
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SystemCoreClock = __SYSTEM_CLOCK;
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}
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