79 lines
2.5 KiB
C
79 lines
2.5 KiB
C
/******************************************************************************
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* @file system_M451Series.c
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* @version V0.10
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* $Revision: 11 $
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* $Date: 15/09/02 10:02a $
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* @brief CMSIS Cortex-M4 Core Peripheral Access Layer Source File for M451 Series MCU
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*
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* @note
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* Copyright (C) 2013~2015 Nuvoton Technology Corp. All rights reserved.
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*****************************************************************************/
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#include "M451Series.h"
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/*----------------------------------------------------------------------------
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DEFINES
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*----------------------------------------------------------------------------*/
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/*----------------------------------------------------------------------------
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Clock Variable definitions
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*----------------------------------------------------------------------------*/
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uint32_t SystemCoreClock = __SYSTEM_CLOCK; /*!< System Clock Frequency (Core Clock)*/
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uint32_t CyclesPerUs = (__HSI / 1000000); /* Cycles per micro second */
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uint32_t PllClock = __HSI; /*!< PLL Output Clock Frequency */
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uint32_t gau32ClkSrcTbl[] = {__HXT, __LXT, 0, __LIRC, 0, 0, 0, __HIRC};
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/*----------------------------------------------------------------------------
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Clock functions
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*----------------------------------------------------------------------------*/
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void SystemCoreClockUpdate(void) /* Get Core Clock Frequency */
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{
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}
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/**
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* Initialize the system
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*
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* @param None
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* @return None
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*
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* @brief Setup the microcontroller system.
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* Initialize the System.
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*/
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void SystemInit(void)
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{
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/* ToDo: add code to initialize the system
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do not use global variables because this function is called before
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reaching pre-main. RW section maybe overwritten afterwards. */
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SYS_UnlockReg();
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/* One-time POR18 */
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if((SYS->PDID >> 12) == 0x945)
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{
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M32(GCR_BASE+0x14) |= BIT7;
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}
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/* Force to use INV type with HXT */
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CLK->PWRCTL &= ~CLK_PWRCTL_HXTSELTYP_Msk;
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SYS_LockReg();
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#ifdef EBI_INIT
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extern void SYS_Init();
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extern void EBI_Init();
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SYS_UnlockReg();
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SYS_Init();
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EBI_Init();
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SYS_LockReg();
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#endif
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/* FPU settings ------------------------------------------------------------*/
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#if (__FPU_PRESENT == 1) && (__FPU_USED == 1)
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SCB->CPACR |= ((3UL << 10 * 2) | /* set CP10 Full Access */
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(3UL << 11 * 2)); /* set CP11 Full Access */
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#endif
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}
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/*** (C) COPYRIGHT 2013~2015 Nuvoton Technology Corp. ***/
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