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| 2 | mjames | 1 | /**************************************************************************//** |
| 2 | * @file system_ARMCM4.c |
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| 3 | * @brief CMSIS Device System Source File for |
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| 4 | * ARMCM4 Device Series |
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| 5 | * @version V5.00 |
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| 6 | * @date 07. September 2016 |
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| 7 | ******************************************************************************/ |
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| 8 | /* |
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| 9 | * Copyright (c) 2009-2016 ARM Limited. All rights reserved. |
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| 10 | * |
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| 11 | * SPDX-License-Identifier: Apache-2.0 |
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| 12 | * |
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| 13 | * Licensed under the Apache License, Version 2.0 (the License); you may |
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| 14 | * not use this file except in compliance with the License. |
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| 15 | * You may obtain a copy of the License at |
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| 16 | * |
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| 17 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 18 | * |
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| 19 | * Unless required by applicable law or agreed to in writing, software |
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| 20 | * distributed under the License is distributed on an AS IS BASIS, WITHOUT |
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| 21 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 22 | * See the License for the specific language governing permissions and |
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| 23 | * limitations under the License. |
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| 24 | */ |
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| 25 | |||
| 26 | #if defined (ARMCM4) |
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| 27 | #include "ARMCM4.h" |
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| 28 | #elif defined (ARMCM4_FP) |
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| 29 | #include "ARMCM4_FP.h" |
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| 30 | #else |
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| 31 | #error device not specified! |
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| 32 | #endif |
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| 33 | |||
| 34 | /*---------------------------------------------------------------------------- |
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| 35 | Define clocks |
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| 36 | *----------------------------------------------------------------------------*/ |
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| 37 | #define XTAL ( 5000000UL) /* Oscillator frequency */ |
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| 38 | |||
| 39 | #define SYSTEM_CLOCK (5U * XTAL) |
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| 40 | |||
| 41 | |||
| 42 | /*---------------------------------------------------------------------------- |
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| 43 | Externals |
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| 44 | *----------------------------------------------------------------------------*/ |
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| 45 | #if defined (__VTOR_PRESENT) && (__VTOR_PRESENT == 1U) |
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| 46 | extern uint32_t __Vectors; |
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| 47 | #endif |
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| 48 | |||
| 49 | /*---------------------------------------------------------------------------- |
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| 50 | System Core Clock Variable |
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| 51 | *----------------------------------------------------------------------------*/ |
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| 52 | uint32_t SystemCoreClock = SYSTEM_CLOCK; |
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| 53 | |||
| 54 | |||
| 55 | /*---------------------------------------------------------------------------- |
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| 56 | System Core Clock update function |
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| 57 | *----------------------------------------------------------------------------*/ |
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| 58 | void SystemCoreClockUpdate (void) |
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| 59 | { |
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| 60 | SystemCoreClock = SYSTEM_CLOCK; |
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| 61 | } |
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| 62 | |||
| 63 | /*---------------------------------------------------------------------------- |
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| 64 | System initialization function |
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| 65 | *----------------------------------------------------------------------------*/ |
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| 66 | void SystemInit (void) |
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| 67 | { |
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| 68 | |||
| 69 | #if defined (__VTOR_PRESENT) && (__VTOR_PRESENT == 1U) |
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| 70 | SCB->VTOR = (uint32_t) &__Vectors; |
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| 71 | #endif |
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| 72 | |||
| 73 | #if defined (__FPU_USED) && (__FPU_USED == 1U) |
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| 74 | SCB->CPACR |= ((3U << 10U*2U) | /* set CP10 Full Access */ |
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| 75 | (3U << 11U*2U) ); /* set CP11 Full Access */ |
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| 76 | #endif |
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| 77 | |||
| 78 | #ifdef UNALIGNED_SUPPORT_DISABLE |
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| 79 | SCB->CCR |= SCB_CCR_UNALIGN_TRP_Msk; |
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| 80 | #endif |
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| 81 | |||
| 82 | SystemCoreClock = SYSTEM_CLOCK; |
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| 83 | } |