69 lines
2.4 KiB
C
69 lines
2.4 KiB
C
/**************************************************************************//**
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* @file system_ARMCM3.c
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* @brief CMSIS Device System Source File for
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* ARMCM3 Device
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* @version V5.3.1
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* @date 09. July 2018
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******************************************************************************/
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/*
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* Copyright (c) 2009-2018 Arm Limited. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an AS IS BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "ARMCM3.h"
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/*----------------------------------------------------------------------------
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Define clocks
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*----------------------------------------------------------------------------*/
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#define XTAL (50000000UL) /* Oscillator frequency */
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#define SYSTEM_CLOCK (XTAL / 2U)
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/*----------------------------------------------------------------------------
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Externals
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*----------------------------------------------------------------------------*/
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#if defined (__VTOR_PRESENT) && (__VTOR_PRESENT == 1U)
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extern uint32_t __Vectors;
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#endif
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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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System Core Clock update function
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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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System initialization function
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*----------------------------------------------------------------------------*/
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void SystemInit (void)
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{
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#if defined (__VTOR_PRESENT) && (__VTOR_PRESENT == 1U)
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SCB->VTOR = (uint32_t) &__Vectors;
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#endif
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SystemCoreClock = SYSTEM_CLOCK;
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}
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