blob: cea212e691af189167034e447b4c781edfc442db (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/**************************************************************************//**
* @file system_ARMCM4.c
* @brief CMSIS Device System Source File for
* ARMCM4 Device Series
* @version V5.00
* @date 07. September 2016
******************************************************************************/
/*
* Copyright (c) 2009-2016 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
*
* http://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 (ARMCM4)
#include "ARMCM4.h"
#elif defined (ARMCM4_FP)
#include "ARMCM4_FP.h"
#else
#error device not specified!
#endif
/*----------------------------------------------------------------------------
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
#if defined (__FPU_USED) && (__FPU_USED == 1U)
SCB->CPACR |= ((3U << 10U*2U) | /* set CP10 Full Access */
(3U << 11U*2U) ); /* set CP11 Full Access */
#endif
#ifdef UNALIGNED_SUPPORT_DISABLE
SCB->CCR |= SCB_CCR_UNALIGN_TRP_Msk;
#endif
SystemCoreClock = SYSTEM_CLOCK;
}
|
