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102 lines
2.8 KiB
C
102 lines
2.8 KiB
C
/**************************************************************************//**
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* @file system_M2354.c
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* @version V2.00
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* @brief System Setting Source File
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*
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* @note
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* @copyright SPDX-License-Identifier: Apache-2.0
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* Copyright (C) 2016 Nuvoton Technology Corp. All rights reserved.
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*
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******************************************************************************/
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#if defined (__ARMCC_VERSION) && (__ARMCC_VERSION >= 6010050) /* ARM Compiler 6 */
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#include <arm_cmse.h>
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#endif
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#include <stdio.h>
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#include <stdint.h>
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#include "NuMicro.h"
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#if defined(__ICCARM__)
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extern void *__vector_table; /* see startup file */
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#else
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extern void *__vector_handlers; /* see startup file */
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#endif
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/*----------------------------------------------------------------------------
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Clock Variable definitions
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*----------------------------------------------------------------------------*/
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uint32_t SystemCoreClock = __HSI; /*!< System Clock Frequency (Core Clock) */
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uint32_t CyclesPerUs = (__HSI / 1000000UL);/*!< Cycles per micro second */
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uint32_t PllClock = __HSI; /*!< PLL Output Clock Frequency */
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/**
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* @brief Update the Variable SystemCoreClock
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*
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* @details This function is used to update the variable SystemCoreClock
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* and must be called whenever the core clock is changed.
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*/
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void SystemCoreClockUpdate(void)
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{
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/* Update PLL Clock */
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PllClock = CLK_GetPLLClockFreq();
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/* Update System Core Clock */
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SystemCoreClock = CLK_GetCPUFreq();
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/* Update Cycles per micro second */
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CyclesPerUs = (SystemCoreClock + 500000UL) / 1000000UL;
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}
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/**
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* @brief System Initialization
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*
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* @details The necessary initialization of system. Global variables are forbidden here.
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*/
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void SystemInit(void)
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{
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if((__PC() & NS_OFFSET) == 0)
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{
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do
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{
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SYS->REGLCTL = 0x59;
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SYS->REGLCTL = 0x16;
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SYS->REGLCTL = 0x88;
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} while(!SYS->REGLCTL);
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// power gating
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M32(0x400001f4) = 0xfffffffful;
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M32(0x400000dC) = 0ul;
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// GPIO clk
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CLK->AHBCLK |= (0xffful << 20) | (1ul << 14);
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}
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#if defined (__VTOR_PRESENT) && (__VTOR_PRESENT == 1U)
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#if defined(__ICCARM__)
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SCB->VTOR = (uint32_t) &__vector_table;
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#else
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SCB->VTOR = (uint32_t) &__vector_handlers;
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#endif
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#endif
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#ifdef INIT_SYSCLK_AT_BOOTING
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#endif
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}
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/* Return program counter for checking in secure/non-secure domain */
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__attribute__((naked)) uint32_t __PC(void)
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{
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#if defined(__GNUC__)
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__asm(".syntax unified \n");
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#endif
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__asm("mov r0, lr \n");
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__asm("blx lr \n");
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}
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