CMSIS_5/Device/ARM/ARMCM0plus/Source/system_ARMCM0plus.c

/**************************************************************************//**
 * @file     system_ARMCM0plus.c
 * @brief    CMSIS Device System Source File for
 *           ARMCM0plus Device Series
 * @version  V5.00
 * @date     10. January 2018
 ******************************************************************************/
/*
 * Copyright (c) 2009-2018 Arm Limited. All rights reserved.
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 (the License); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "ARMCM0plus.h"

/*----------------------------------------------------------------------------
  Define clocks
 *----------------------------------------------------------------------------*/
#define  XTAL            ( 5000000UL)      /* Oscillator frequency */

#define  SYSTEM_CLOCK    (5U * XTAL)


/*----------------------------------------------------------------------------
  Externals
 *----------------------------------------------------------------------------*/
#if defined (__VTOR_PRESENT) && (__VTOR_PRESENT == 1U)
  extern uint32_t __Vectors;
#endif

/*----------------------------------------------------------------------------
  System Core Clock Variable
 *----------------------------------------------------------------------------*/
uint32_t SystemCoreClock = SYSTEM_CLOCK;


/*----------------------------------------------------------------------------
  System Core Clock update function
 *----------------------------------------------------------------------------*/
void SystemCoreClockUpdate (void)
{
  SystemCoreClock = SYSTEM_CLOCK;
}

/*----------------------------------------------------------------------------
  System initialization function
 *----------------------------------------------------------------------------*/
void SystemInit (void)
{

#if defined (__VTOR_PRESENT) && (__VTOR_PRESENT == 1U)
  SCB->VTOR = (uint32_t) &__Vectors;
#endif

  SystemCoreClock = SYSTEM_CLOCK;
}