text: /**************************************************************************//**
   * @file     system_ARMCM55.c
   * @brief    CMSIS Device System Source File for
   *           ARMCM55 Device
   * @version  V1.0.0
   * @date     23. March 2020
   ******************************************************************************/
  /*
   * Copyright (c) 2009-2020 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.
   */
  
  #if defined (ARMCM55)
    #include "ARMCM55.h"
  
    #if defined (__ARM_FEATURE_CMSE) &&  (__ARM_FEATURE_CMSE == 3U)
      #include "partition_ARMCM55.h"
    #endif
  
  #else
    #error device not specified!
  #endif
  
  /*----------------------------------------------------------------------------
    Define clocks
   *----------------------------------------------------------------------------*/
  #define  XTAL            ( 5000000UL)      /* Oscillator frequency */
  
  #define  SYSTEM_CLOCK    (5U * XTAL)
  
  
  /*----------------------------------------------------------------------------
    Exception / Interrupt Vector table
   *----------------------------------------------------------------------------*/
  extern const VECTOR_TABLE_Type __VECTOR_TABLE[496];
  
  
  /*----------------------------------------------------------------------------
    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)(&__VECTOR_TABLE[0]);
  #endif
  
  #if (defined (__FPU_USED) && (__FPU_USED == 1U)) || \
      (defined (__ARM_FEATURE_MVE) && (__ARM_FEATURE_MVE > 0U))
    SCB->CPACR |= ((3U << 10U*2U) |           /* enable CP10 Full Access */
                   (3U << 11U*2U)  );         /* enable CP11 Full Access */
  #endif
  
  #ifdef UNALIGNED_SUPPORT_DISABLE
    SCB->CCR |= SCB_CCR_UNALIGN_TRP_Msk;
  #endif
  
  #if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U)
    TZ_SAU_Setup();
  #endif
  
    SystemCoreClock = SYSTEM_CLOCK;
  }
  