1  /**************************************************************************//**
 2   * @file     system_ARMCM55.c
 3   * @brief    CMSIS Device System Source File for
 4   *           ARMCM55 Device
 5   * @version  V1.0.0
 6   * @date     23. March 2020
 7   ******************************************************************************/
 8  /*
 9   * Copyright (c) 2009-2020 Arm Limited. All rights reserved.
10   *
11   * SPDX-License-Identifier: Apache-2.0
12   *
13   * Licensed under the Apache License, Version 2.0 (the License); you may
14   * not use this file except in compliance with the License.
15   * You may obtain a copy of the License at
16   *
17   * www.apache.org/licenses/LICENSE-2.0
18   *
19   * Unless required by applicable law or agreed to in writing, software
20   * distributed under the License is distributed on an AS IS BASIS, WITHOUT
21   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
22   * See the License for the specific language governing permissions and
23   * limitations under the License.
24   */
25  
26  #if defined (ARMCM55)
27    #include "ARMCM55.h"
28  
29    #if defined (__ARM_FEATURE_CMSE) &&  (__ARM_FEATURE_CMSE == 3U)
30      #include "partition_ARMCM55.h"
31    #endif
32  
33  #else
34    #error device not specified!
35  #endif
36  
37  /*----------------------------------------------------------------------------
38    Define clocks
39   *----------------------------------------------------------------------------*/
40  #define  XTAL            ( 5000000UL)      /* Oscillator frequency */
41  
42  #define  SYSTEM_CLOCK    (5U * XTAL)
43  
44  
45  /*----------------------------------------------------------------------------
46    Exception / Interrupt Vector table
47   *----------------------------------------------------------------------------*/
48  extern const VECTOR_TABLE_Type __VECTOR_TABLE[496];
49  
50  
51  /*----------------------------------------------------------------------------
52    System Core Clock Variable
53   *----------------------------------------------------------------------------*/
54  uint32_t SystemCoreClock = SYSTEM_CLOCK;
55  
56  
57  /*----------------------------------------------------------------------------
58    System Core Clock update function
59   *----------------------------------------------------------------------------*/
60  void SystemCoreClockUpdate (void)
61  {
62    SystemCoreClock = SYSTEM_CLOCK;
63  }
64  
65  /*----------------------------------------------------------------------------
66    System initialization function
67   *----------------------------------------------------------------------------*/
68  void SystemInit (void)
69  {
70  
71  #if defined (__VTOR_PRESENT) && (__VTOR_PRESENT == 1U)
72    SCB->VTOR = (uint32_t)(&__VECTOR_TABLE[0]);
73  #endif
74  
75  #if (defined (__FPU_USED) && (__FPU_USED == 1U)) || \
76      (defined (__ARM_FEATURE_MVE) && (__ARM_FEATURE_MVE > 0U))
77    SCB->CPACR |= ((3U << 10U*2U) |           /* enable CP10 Full Access */
78                   (3U << 11U*2U)  );         /* enable CP11 Full Access */
79  #endif
80  
81  #ifdef UNALIGNED_SUPPORT_DISABLE
82    SCB->CCR |= SCB_CCR_UNALIGN_TRP_Msk;
83  #endif
84  
85  #if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U)
86    TZ_SAU_Setup();
87  #endif
88  
89    SystemCoreClock = SYSTEM_CLOCK;
90  }