1 /**************************************************************************//**
2 * @file system_ARMCM0plus.c
3 * @brief CMSIS Device System Source File for
4 * ARMCM0plus Device
5 * @version V2.0.0
6 * @date 06. April 2023
7 ******************************************************************************/
8 /*
9 * Copyright (c) 2009-2023 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 (ARMCM0P)
27 #include "ARMCM0plus.h"
28 #else
29 #error device not specified!
30 #endif
31
32 /*----------------------------------------------------------------------------
33 Define clocks
34 *----------------------------------------------------------------------------*/
35 #define XTAL (50000000UL) /* Oscillator frequency */
36
37 #define SYSTEM_CLOCK (XTAL / 2U)
38
39 /*----------------------------------------------------------------------------
40 Exception / Interrupt Vector table
41 *----------------------------------------------------------------------------*/
42 extern const VECTOR_TABLE_Type __VECTOR_TABLE[48];
43
44 /*----------------------------------------------------------------------------
45 System Core Clock Variable
46 *----------------------------------------------------------------------------*/
47 uint32_t SystemCoreClock = SYSTEM_CLOCK; /* System Core Clock Frequency */
48
49
50 /*----------------------------------------------------------------------------
51 System Core Clock update function
52 *----------------------------------------------------------------------------*/
SystemCoreClockUpdate(void)53 void SystemCoreClockUpdate (void)
54 {
55 SystemCoreClock = SYSTEM_CLOCK;
56 }
57
58 /*----------------------------------------------------------------------------
59 System initialization function
60 *----------------------------------------------------------------------------*/
SystemInit(void)61 void SystemInit (void)
62 {
63
64 #if defined (__VTOR_PRESENT) && (__VTOR_PRESENT == 1U)
65 SCB->VTOR = (uint32_t) &(__VECTOR_TABLE[0]);
66 #endif
67
68 SystemCoreClock = SYSTEM_CLOCK;
69 }
70
