/**************************************************************************//** * @file system_ARMCM55.c * @brief CMSIS Device System Source File for * ARMCM55 Device * @version V1.1.0 * @date 28. March 2022 ******************************************************************************/ /* * Copyright (c) 2009-2022 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 * * 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 (ARMCM55) #include "ARMCM55.h" #else #error device not specified! #endif #if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U) #include "partition_ARMCM55.h" #endif /*---------------------------------------------------------------------------- Define clocks *----------------------------------------------------------------------------*/ #define XTAL ( 5000000UL) /* Oscillator frequency */ #define SYSTEM_CLOCK (5U * XTAL) /*---------------------------------------------------------------------------- Exception / Interrupt Vector table *----------------------------------------------------------------------------*/ extern const VECTOR_TABLE_Type __VECTOR_TABLE[496]; /*---------------------------------------------------------------------------- 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)(&__VECTOR_TABLE[0]); #endif #if (defined (__FPU_USED) && (__FPU_USED == 1U)) || \ (defined (__ARM_FEATURE_MVE) && (__ARM_FEATURE_MVE > 0U)) SCB->CPACR |= ((3U << 10U*2U) | /* enable CP10 Full Access */ (3U << 11U*2U) ); /* enable CP11 Full Access */ /* Set low-power state for PDEPU */ /* 0b00 | ON, PDEPU is not in low-power state */ /* 0b01 | ON, but the clock is off */ /* 0b10 | RET(ention) */ /* 0b11 | OFF */ /* Clear ELPSTATE, value is 0b11 on Cold reset */ PWRMODCTL->CPDLPSTATE &= ~(PWRMODCTL_CPDLPSTATE_ELPSTATE_Msk); /* Favor best FP/MVE performance by default, avoid EPU switch-ON delays */ /* PDEPU ON, Clock OFF */ PWRMODCTL->CPDLPSTATE |= 0x1 << PWRMODCTL_CPDLPSTATE_ELPSTATE_Pos; #endif #ifdef UNALIGNED_SUPPORT_DISABLE SCB->CCR |= SCB_CCR_UNALIGN_TRP_Msk; #endif /* Enable Loop and branch info cache */ SCB->CCR |= SCB_CCR_LOB_Msk; __DSB(); __ISB(); #if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U) TZ_SAU_Setup(); #endif SystemCoreClock = SYSTEM_CLOCK; }