1 /**************************************************************************//**
2 * @file system_ARMCM7.c
3 * @brief CMSIS Device System Source File for
4 * ARMCM7 Device
5 * @version V1.0.1
6 * @date 15. November 2019
7 ******************************************************************************/
8 /*
9 * Copyright (c) 2009-2019 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 (ARMCM7)
27 #include "ARMCM7.h"
28 #elif defined (ARMCM7_SP)
29 #include "ARMCM7_SP.h"
30 #elif defined (ARMCM7_DP)
31 #include "ARMCM7_DP.h"
32 #else
33 #error device not specified!
34 #endif
35
36 /*----------------------------------------------------------------------------
37 Define clocks
38 *----------------------------------------------------------------------------*/
39 #define XTAL (50000000UL) /* Oscillator frequency */
40
41 #define SYSTEM_CLOCK (XTAL / 2U)
42
43 /*----------------------------------------------------------------------------
44 Exception / Interrupt Vector table
45 *----------------------------------------------------------------------------*/
46 extern const VECTOR_TABLE_Type __VECTOR_TABLE[240];
47
48
49 /*----------------------------------------------------------------------------
50 System Core Clock Variable
51 *----------------------------------------------------------------------------*/
52 uint32_t SystemCoreClock = SYSTEM_CLOCK; /* System Core Clock Frequency */
53
54
55 /*----------------------------------------------------------------------------
56 System Core Clock update function
57 *----------------------------------------------------------------------------*/
SystemCoreClockUpdate(void)58 void SystemCoreClockUpdate (void)
59 {
60 SystemCoreClock = SYSTEM_CLOCK;
61 }
62
63 /*----------------------------------------------------------------------------
64 System initialization function
65 *----------------------------------------------------------------------------*/
SystemInit(void)66 void SystemInit (void)
67 {
68
69 #if defined (__VTOR_PRESENT) && (__VTOR_PRESENT == 1U)
70 SCB->VTOR = (uint32_t) &(__VECTOR_TABLE[0]);
71 #endif
72
73 #if defined (__FPU_USED) && (__FPU_USED == 1U)
74 SCB->CPACR |= ((3U << 10U*2U) | /* enable CP10 Full Access */
75 (3U << 11U*2U) ); /* enable CP11 Full Access */
76 #endif
77
78 #ifdef UNALIGNED_SUPPORT_DISABLE
79 SCB->CCR |= SCB_CCR_UNALIGN_TRP_Msk;
80 #endif
81
82 SystemCoreClock = SYSTEM_CLOCK;
83 }
84
