alexander | 3c79893 | 2021-03-26 21:42:19 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2021 Arm Limited. All rights reserved. |
| 3 | * SPDX-License-Identifier: Apache-2.0 |
| 4 | * |
| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
| 16 | */ |
| 17 | #include "cmsis.h" |
| 18 | |
| 19 | extern void *__Vectors; /* see irqs.c */ |
| 20 | |
| 21 | /*----------------------------------------------------------------------------*\ |
| 22 | * Define clocks (uses OSC1 ACLK) * |
| 23 | \*----------------------------------------------------------------------------*/ |
| 24 | #define __XTAL (25000000) /* Oscillator frequency */ |
| 25 | #define __SYSTEM_CLOCK (__XTAL) |
| 26 | |
alexander | 3c79893 | 2021-03-26 21:42:19 +0000 | [diff] [blame] | 27 | #if defined(CPU_CORTEX_M55) |
| 28 | #define CCR_DL (1 << 19) |
| 29 | #else |
| 30 | #error "Invalid CPU; This file only services Cortex-M55 CPUs" |
| 31 | #endif /* (CPU_CORTEX_M55) */ |
| 32 | |
| 33 | /*---------------------------------------------------------------------------- |
| 34 | System Core Clock Variable (Core Clock) |
| 35 | *----------------------------------------------------------------------------*/ |
| 36 | uint32_t SystemCoreClock = __SYSTEM_CLOCK; |
| 37 | |
| 38 | |
| 39 | /*---------------------------------------------------------------------------- |
| 40 | Clock functions |
| 41 | *----------------------------------------------------------------------------*/ |
| 42 | /** |
| 43 | * @brief Updates the SystemCoreClock variable with current core Clock |
| 44 | * retrieved from cpu registers. |
| 45 | */ |
| 46 | void SystemCoreClockUpdate(void) |
| 47 | { |
| 48 | /* Update the SystemCoreClock variable */ |
| 49 | SystemCoreClock = __SYSTEM_CLOCK; |
| 50 | } |
| 51 | |
| 52 | uint32_t GetSystemCoreClock(void) |
| 53 | { |
| 54 | return SystemCoreClock; |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * @brief Setup the microcontroller system. |
| 59 | * Initialize the System. |
| 60 | **/ |
| 61 | void SystemInit(void) |
| 62 | { |
| 63 | #if (defined (__FPU_USED) && (__FPU_USED == 1U)) || \ |
| 64 | (defined (__MVE_USED) && (__MVE_USED == 1U)) |
| 65 | SCB->CPACR |= ((3U << 10U*2U) | /* enable CP10 Full Access */ |
| 66 | (3U << 11U*2U) ); |
| 67 | #endif |
| 68 | |
alexander | 3c79893 | 2021-03-26 21:42:19 +0000 | [diff] [blame] | 69 | #if defined (__VTOR_PRESENT) && (__VTOR_PRESENT == 1U) |
| 70 | SCB->VTOR = (uint32_t) &__Vectors; |
| 71 | #endif |
| 72 | |
| 73 | /* Enable hard, bus, mem and usage fault detection in SHCSR, bits 16-18. |
| 74 | * Enable stkof, bf, div_0_trp, unalign_trp and usersetm bits in CCR. |
| 75 | */ |
| 76 | SCB->SHCSR = ( |
| 77 | _VAL2FLD(SCB_SHCSR_USGFAULTENA, 1) | |
| 78 | _VAL2FLD(SCB_SHCSR_BUSFAULTENA, 1) | |
| 79 | _VAL2FLD(SCB_SHCSR_MEMFAULTENA, 1)); |
| 80 | |
| 81 | SCB->CCR = (_VAL2FLD(SCB_CCR_USERSETMPEND, 1) | |
| 82 | _VAL2FLD(SCB_CCR_DIV_0_TRP, 1) | |
| 83 | _VAL2FLD(SCB_CCR_BFHFNMIGN, 1) | |
| 84 | _VAL2FLD(SCB_CCR_STKOFHFNMIGN, 1)); |
| 85 | #ifdef UNALIGNED_SUPPORT_DISABLE |
| 86 | SCB->CCR |= _VAL2FLD(SCB_CCR_UNALIGN_TRP, 1); |
| 87 | #endif |
| 88 | |
| 89 | SCB->CCR |= CCR_DL; |
| 90 | |
| 91 | /* Reset pipeline. */ |
| 92 | __DSB(); |
| 93 | __ISB(); |
| 94 | |
| 95 | #ifdef UNALIGNED_SUPPORT_DISABLE |
| 96 | SCB->CCR |= SCB_CCR_UNALIGN_TRP_Msk; |
| 97 | #endif |
| 98 | |
| 99 | SystemCoreClock = __SYSTEM_CLOCK; |
| 100 | } |