mbed library sources
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Diff: targets/cmsis/TARGET_ARM_SSG/TARGET_MPS2_M4/system_CMSDK_CM4.c
- Revision:
- 580:3c14cb9b87c5
diff -r 53297373a894 -r 3c14cb9b87c5 targets/cmsis/TARGET_ARM_SSG/TARGET_MPS2_M4/system_CMSDK_CM4.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/cmsis/TARGET_ARM_SSG/TARGET_MPS2_M4/system_CMSDK_CM4.c Thu Jul 02 16:15:09 2015 +0100 @@ -0,0 +1,101 @@ +/* MPS2 CMSIS Library +* +* Copyright (c) 2006-2015 ARM Limited +* All rights reserved. +* +* Redistribution and use in source and binary forms, with or without +* modification, are permitted provided that the following conditions are met: +* +* 1. Redistributions of source code must retain the above copyright notice, +* this list of conditions and the following disclaimer. +* +* 2. Redistributions in binary form must reproduce the above copyright notice, +* this list of conditions and the following disclaimer in the documentation +* and/or other materials provided with the distribution. +* +* 3. Neither the name of the copyright holder nor the names of its contributors +* may be used to endorse or promote products derived from this software without +* specific prior written permission. +* +* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" +* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE +* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR +* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF +* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS +* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN +* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) +* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +* POSSIBILITY OF SUCH DAMAGE. +******************************************************************************* +* @file system_CMSDK_CM4.c +* @brief CMSIS Device System Source File for +* CMSDK_M4 Device +* @version V3.02 +* @date 15. November 2013 +* +* @note +* +*******************************************************************************/ + + + +#include "CMSDK_CM4.h" + +/*---------------------------------------------------------------------------- + Define clocks + *----------------------------------------------------------------------------*/ +#define __XTAL (50000000UL) /* Oscillator frequency */ + +#define __SYSTEM_CLOCK (__XTAL / 2) + + +/*---------------------------------------------------------------------------- + Clock Variable definitions + *----------------------------------------------------------------------------*/ +uint32_t SystemCoreClock = __SYSTEM_CLOCK;/*!< System Clock Frequency (Core Clock)*/ + + +/*---------------------------------------------------------------------------- + Clock functions + *----------------------------------------------------------------------------*/ +/** + * Update SystemCoreClock variable + * + * @param none + * @return none + * + * @brief Updates the SystemCoreClock with current core Clock + * retrieved from cpu registers. + */ +void SystemCoreClockUpdate (void) +{ + + SystemCoreClock = __SYSTEM_CLOCK; + +} + +/** + * Initialize the system + * + * @param none + * @return none + * + * @brief Setup the microcontroller system. + * Initialize the System. + */ +void SystemInit (void) +{ + #if (__FPU_USED == 1) + SCB->CPACR |= ((3UL << 10*2) | /* set CP10 Full Access */ + (3UL << 11*2) ); /* set CP11 Full Access */ + #endif + +#ifdef UNALIGNED_SUPPORT_DISABLE + SCB->CCR |= SCB_CCR_UNALIGN_TRP_Msk; +#endif + + SystemCoreClock = __SYSTEM_CLOCK; + +}