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https://github.com/silenty4ng/uv-k5-firmware-chinese-lts
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82 lines
2.8 KiB
C
82 lines
2.8 KiB
C
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/**************************************************************************//**
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* @file system_ARMCM4.c
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* @brief CMSIS Device System Source File for
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* ARMCM4 Device
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* @version V1.0.1
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* @date 15. November 2019
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******************************************************************************/
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/*
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* Copyright (c) 2009-2019 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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#if defined (ARMCM4)
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#include "ARMCM4.h"
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#elif defined (ARMCM4_FP)
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#include "ARMCM4_FP.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 XTAL (50000000UL) /* Oscillator frequency */
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#define SYSTEM_CLOCK (XTAL / 2U)
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/*----------------------------------------------------------------------------
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Exception / Interrupt Vector table
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*----------------------------------------------------------------------------*/
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extern const VECTOR_TABLE_Type __VECTOR_TABLE[240];
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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) &(__VECTOR_TABLE[0]);
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#endif
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#if defined (__FPU_USED) && (__FPU_USED == 1U)
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SCB->CPACR |= ((3U << 10U*2U) | /* enable CP10 Full Access */
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(3U << 11U*2U) ); /* enable 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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