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targets/TARGET_NUVOTON/TARGET_M451/device/system_M451Series.c@151:91825d030f9b, 2016-11-14 (annotated)

Committer:
DangerousElectrician
Date:
Mon Nov 14 04:39:23 2016 +0000
Revision:
151:91825d030f9b
Parent:
149:156823d33999 
stuff changed?

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /******************************************************************************
<> 149:156823d33999 2 * @file system_M451Series.c
<> 149:156823d33999 3 * @version V0.10
<> 149:156823d33999 4 * $Revision: 11 $
<> 149:156823d33999 5 * $Date: 15/09/02 10:02a $
<> 149:156823d33999 6 * @brief CMSIS Cortex-M4 Core Peripheral Access Layer Source File for M451 Series MCU
<> 149:156823d33999 7 *
<> 149:156823d33999 8 * @note
<> 149:156823d33999 9 * Copyright (C) 2013~2015 Nuvoton Technology Corp. All rights reserved.
<> 149:156823d33999 10 *****************************************************************************/
<> 149:156823d33999 11
<> 149:156823d33999 12 #include "M451Series.h"
<> 149:156823d33999 13
<> 149:156823d33999 14
<> 149:156823d33999 15 /*----------------------------------------------------------------------------
<> 149:156823d33999 16 DEFINES
<> 149:156823d33999 17 *----------------------------------------------------------------------------*/
<> 149:156823d33999 18
<> 149:156823d33999 19
<> 149:156823d33999 20 /*----------------------------------------------------------------------------
<> 149:156823d33999 21 Clock Variable definitions
<> 149:156823d33999 22 *----------------------------------------------------------------------------*/
<> 149:156823d33999 23 uint32_t SystemCoreClock = __SYSTEM_CLOCK; /*!< System Clock Frequency (Core Clock)*/
<> 149:156823d33999 24 uint32_t CyclesPerUs = (__HSI / 1000000); /* Cycles per micro second */
<> 149:156823d33999 25 uint32_t PllClock = __HSI; /*!< PLL Output Clock Frequency */
<> 149:156823d33999 26 uint32_t gau32ClkSrcTbl[] = {__HXT, __LXT, 0, __LIRC, 0, 0, 0, __HIRC};
<> 149:156823d33999 27
<> 149:156823d33999 28 /*----------------------------------------------------------------------------
<> 149:156823d33999 29 Clock functions
<> 149:156823d33999 30 *----------------------------------------------------------------------------*/
<> 149:156823d33999 31 void SystemCoreClockUpdate(void) /* Get Core Clock Frequency */
<> 149:156823d33999 32 {
<> 149:156823d33999 33 #if 1
<> 149:156823d33999 34 uint32_t u32Freq, u32ClkSrc;
<> 149:156823d33999 35 uint32_t u32HclkDiv;
<> 149:156823d33999 36
<> 149:156823d33999 37 /* Update PLL Clock */
<> 149:156823d33999 38 PllClock = CLK_GetPLLClockFreq();
<> 149:156823d33999 39
<> 149:156823d33999 40 u32ClkSrc = CLK->CLKSEL0 & CLK_CLKSEL0_HCLKSEL_Msk;
<> 149:156823d33999 41
<> 149:156823d33999 42 if(u32ClkSrc == CLK_CLKSEL0_HCLKSEL_PLL)
<> 149:156823d33999 43 {
<> 149:156823d33999 44 /* Use PLL clock */
<> 149:156823d33999 45 u32Freq = PllClock;
<> 149:156823d33999 46 }
<> 149:156823d33999 47 else
<> 149:156823d33999 48 {
<> 149:156823d33999 49 /* Use the clock sources directly */
<> 149:156823d33999 50 u32Freq = gau32ClkSrcTbl[u32ClkSrc];
<> 149:156823d33999 51 }
<> 149:156823d33999 52
<> 149:156823d33999 53 u32HclkDiv = (CLK->CLKDIV0 & CLK_CLKDIV0_HCLKDIV_Msk) + 1;
<> 149:156823d33999 54
<> 149:156823d33999 55 /* Update System Core Clock */
<> 149:156823d33999 56 SystemCoreClock = u32Freq / u32HclkDiv;
<> 149:156823d33999 57
<> 149:156823d33999 58
<> 149:156823d33999 59 //if(SystemCoreClock == 0)
<> 149:156823d33999 60 // __BKPT(0);
<> 149:156823d33999 61
<> 149:156823d33999 62 CyclesPerUs = (SystemCoreClock + 500000) / 1000000;
<> 149:156823d33999 63 #endif
<> 149:156823d33999 64 }
<> 149:156823d33999 65
<> 149:156823d33999 66 /**
<> 149:156823d33999 67 * Initialize the system
<> 149:156823d33999 68 *
<> 149:156823d33999 69 * @param None
<> 149:156823d33999 70 * @return None
<> 149:156823d33999 71 *
<> 149:156823d33999 72 * @brief Setup the microcontroller system.
<> 149:156823d33999 73 * Initialize the System.
<> 149:156823d33999 74 */
<> 149:156823d33999 75 void SystemInit(void)
<> 149:156823d33999 76 {
<> 149:156823d33999 77 /* ToDo: add code to initialize the system
<> 149:156823d33999 78 do not use global variables because this function is called before
<> 149:156823d33999 79 reaching pre-main. RW section maybe overwritten afterwards. */
<> 149:156823d33999 80
<> 149:156823d33999 81 SYS_UnlockReg();
<> 149:156823d33999 82 /* One-time POR18 */
<> 149:156823d33999 83 if((SYS->PDID >> 12) == 0x945)
<> 149:156823d33999 84 {
<> 149:156823d33999 85 M32(GCR_BASE+0x14) |= BIT7;
<> 149:156823d33999 86 }
<> 149:156823d33999 87 /* Force to use INV type with HXT */
<> 149:156823d33999 88 CLK->PWRCTL &= ~CLK_PWRCTL_HXTSELTYP_Msk;
<> 149:156823d33999 89 SYS_LockReg();
<> 149:156823d33999 90
<> 149:156823d33999 91
<> 149:156823d33999 92 #if 0
<> 149:156823d33999 93 // NOTE: C-runtime not initialized yet. Ensure no static memory (global variable) are accessed in this function.
<> 149:156823d33999 94 nu_ebi_init();
<> 149:156823d33999 95 #endif
<> 149:156823d33999 96
<> 149:156823d33999 97 /* FPU settings ------------------------------------------------------------*/
<> 149:156823d33999 98 #if (__FPU_PRESENT == 1) && (__FPU_USED == 1)
<> 149:156823d33999 99 SCB->CPACR |= ((3UL << 10 * 2) | /* set CP10 Full Access */
<> 149:156823d33999 100 (3UL << 11 * 2)); /* set CP11 Full Access */
<> 149:156823d33999 101 #endif
<> 149:156823d33999 102
<> 149:156823d33999 103 }
<> 149:156823d33999 104
<> 149:156823d33999 105 #if 0
<> 149:156823d33999 106 void nu_ebi_init(void)
<> 149:156823d33999 107 {
<> 149:156823d33999 108 // TO BE CONTINUED
<> 149:156823d33999 109 }
<> 149:156823d33999 110 #endif
<> 149:156823d33999 111 /*** (C) COPYRIGHT 2013~2015 Nuvoton Technology Corp. ***/