/**************************************************************************//**
* @file system_NUC472_442.c
* @version V1.00
* $Revision: 15 $
* $Date: 14/05/29 1:13p $
* @brief NUC472/NUC442 system clock init code and assert handler
*
* @note
* Copyright (C) 2013 Nuvoton Technology Corp. All rights reserved.
*****************************************************************************/
#include "NUC472_442.h"
//#include "rtc.h"
/*----------------------------------------------------------------------------
Clock Variable definitions
*----------------------------------------------------------------------------*/
uint32_t SystemCoreClock = __HSI; /*!< System Clock Frequency (Core Clock)*/
uint32_t CyclesPerUs = (__HSI / 1000000); /*!< Cycles per micro second */
uint32_t gau32ClkSrcTbl[] = {__HXT, __LXT, 0, __LIRC, 0, 0, 0, __HIRC}; /*!< System clock source table */
#if defined TARGET_NU_XRAM_SUPPORTED
static void nu_ebi_init(void);
#endif
/*----------------------------------------------------------------------------
Clock functions
*----------------------------------------------------------------------------*/
void SystemCoreClockUpdate (void) /* Get Core Clock Frequency */
{
uint32_t u32Freq, u32ClkSrc;
uint32_t u32HclkDiv;
u32ClkSrc = CLK->CLKSEL0 & CLK_CLKSEL0_HCLKSEL_Msk;
if(u32ClkSrc != CLK_CLKSEL0_HCLKSEL_PLL) {
/* Use the clock sources directly */
u32Freq = gau32ClkSrcTbl[u32ClkSrc];
} else {
/* Use PLL clock */
u32Freq = CLK_GetPLLClockFreq();
}
u32HclkDiv = (CLK->CLKDIV0 & CLK_CLKDIV0_HCLKDIV_Msk) + 1;
/* Update System Core Clock */
SystemCoreClock = u32Freq/u32HclkDiv;
CyclesPerUs = (SystemCoreClock + 500000) / 1000000;
}
/**
* Initialize the system
*
* @return none
*
* @brief Setup the microcontroller system.
*/
void SystemInit (void)
{
//uint32_t u32RTC_EN_Flag = 0;
/* FPU settings ------------------------------------------------------------*/
#if (__FPU_PRESENT == 1) && (__FPU_USED == 1)
SCB->CPACR |= ((3UL << 10*2) | /* set CP10 Full Access */
(3UL << 11*2) ); /* set CP11 Full Access */
#endif
/* The code snippet below is for old-version chip and has potential risk, e.g. program reboots and hangs in it with the call to NVIC_SystemReset(). Remove it for new-version chip. */
#if 0
/* ------------------ Release Tamper pin ---------------------------------*/
/* Waiting for 10kHz clock ready */
CLK_WaitClockReady(CLK_STATUS_LIRCSTB_Msk);
u32RTC_EN_Flag = ((CLK->APBCLK0 & CLK_APBCLK0_RTCCKEN_Msk) >> CLK_APBCLK0_RTCCKEN_Pos);
if(!u32RTC_EN_Flag) {
CLK->APBCLK0 |= CLK_APBCLK0_RTCCKEN_Msk; // RTC Clock Enable
}
RTC->INIT = RTC_INIT_KEY;
while(RTC->INIT != 0x1);
if(!(RTC->TAMPCTL & RTC_TAMPCTL_TIEN_Msk)) {
RTC->RWEN = RTC_WRITE_KEY;
while(!(RTC->RWEN & RTC_RWEN_RWENF_Msk));
RTC->SPRCTL |= RTC_SPRCTL_SPRRWEN_Msk;
while(!(RTC->SPRCTL & RTC_SPRCTL_SPRRWRDY_Msk));
RTC->RWEN = RTC_WRITE_KEY;
while(!(RTC->RWEN & RTC_RWEN_RWENF_Msk));
RTC->SPR[23] = RTC->SPR[23];
while(!(RTC->SPRCTL & RTC_SPRCTL_SPRRWRDY_Msk));
RTC->RWEN = RTC_WRITE_KEY;
while(!(RTC->RWEN & RTC_RWEN_RWENF_Msk));
RTC->SPRCTL &= ~RTC_SPRCTL_SPRRWEN_Msk;
while(!(RTC->SPRCTL & RTC_SPRCTL_SPRRWRDY_Msk));
RTC->RWEN = RTC_WRITE_KEY;
while(!(RTC->RWEN & RTC_RWEN_RWENF_Msk));
RTC->INTSTS = RTC_INTSTS_TICKIF_Msk;
}
if(!u32RTC_EN_Flag) {
CLK->APBCLK0 &= ~CLK_APBCLK0_RTCCKEN_Msk; // RTC Clock Disable
}
/*------------------------------------------------------------------------*/
#endif
#if defined TARGET_NU_XRAM_SUPPORTED
// NOTE: C-runtime not initialized yet. Ensure no static memory (global variable) are accessed in this function.
nu_ebi_init();
#endif
}
#if defined TARGET_NU_XRAM_SUPPORTED
void nu_ebi_init(void)
{
/* Enable IP clock */
CLK_EnableModuleClock(EBI_MODULE);
/* Configure EBI multi-function pins */
SYS->GPA_MFPH = (SYS->GPA_MFPH & (~SYS_GPA_MFPH_PA10MFP_Msk) ) | SYS_GPA_MFPH_PA10MFP_EBI_A20; /* A20. = PA10 */
SYS->GPA_MFPH = (SYS->GPA_MFPH & (~SYS_GPA_MFPH_PA9MFP_Msk) ) | SYS_GPA_MFPH_PA9MFP_EBI_A19; /* A19. = PA9 */
SYS->GPA_MFPH = (SYS->GPA_MFPH & (~SYS_GPA_MFPH_PA8MFP_Msk) ) | SYS_GPA_MFPH_PA8MFP_EBI_A18; /* A18. = PA8 */
SYS->GPA_MFPL = (SYS->GPA_MFPL & (~SYS_GPA_MFPL_PA7MFP_Msk) ) | SYS_GPA_MFPL_PA7MFP_EBI_A17; /* A17. = PA7 */
SYS->GPA_MFPL = (SYS->GPA_MFPL & (~SYS_GPA_MFPL_PA6MFP_Msk) ) | SYS_GPA_MFPL_PA6MFP_EBI_A16; /* A16. = PA6 */
SYS->GPB_MFPH = (SYS->GPB_MFPH & (~SYS_GPB_MFPH_PB13MFP_Msk) ) | SYS_GPB_MFPH_PB13MFP_EBI_AD15; /* AD15 = PB13 */
SYS->GPB_MFPH = (SYS->GPB_MFPH & (~SYS_GPB_MFPH_PB12MFP_Msk) ) | SYS_GPB_MFPH_PB12MFP_EBI_AD14; /* AD14 = PB12 */
SYS->GPB_MFPH = (SYS->GPB_MFPH & (~SYS_GPB_MFPH_PB11MFP_Msk) ) | SYS_GPB_MFPH_PB11MFP_EBI_AD13; /* AD13 = PB11 */
SYS->GPB_MFPH = (SYS->GPB_MFPH & (~SYS_GPB_MFPH_PB10MFP_Msk) ) | SYS_GPB_MFPH_PB10MFP_EBI_AD12; /* AD12 = PB10 */
SYS->GPB_MFPH = (SYS->GPB_MFPH & (~SYS_GPB_MFPH_PB9MFP_Msk) ) | SYS_GPB_MFPH_PB9MFP_EBI_AD11; /* AD11 = PB9 */
SYS->GPB_MFPH = (SYS->GPB_MFPH & (~SYS_GPB_MFPH_PB8MFP_Msk) ) | SYS_GPB_MFPH_PB8MFP_EBI_AD10; /* AD10 = PB8 */
SYS->GPB_MFPL = (SYS->GPB_MFPL & (~SYS_GPB_MFPL_PB7MFP_Msk) ) | SYS_GPB_MFPL_PB7MFP_EBI_AD9; /* AD9 = PB7 */
SYS->GPB_MFPL = (SYS->GPB_MFPL & (~SYS_GPB_MFPL_PB6MFP_Msk) ) | SYS_GPB_MFPL_PB6MFP_EBI_AD8; /* AD8 = PB6 */
SYS->GPB_MFPL = (SYS->GPB_MFPL & (~SYS_GPB_MFPL_PB5MFP_Msk) ) | SYS_GPB_MFPL_PB5MFP_EBI_AD7; /* AD7 = PB5 */
SYS->GPB_MFPL = (SYS->GPB_MFPL & (~SYS_GPB_MFPL_PB4MFP_Msk) ) | SYS_GPB_MFPL_PB4MFP_EBI_AD6; /* AD6 = PB4 */
SYS->GPB_MFPL = (SYS->GPB_MFPL & (~SYS_GPB_MFPL_PB3MFP_Msk) ) | SYS_GPB_MFPL_PB3MFP_EBI_AD5; /* AD5 = PB3 */
SYS->GPB_MFPL = (SYS->GPB_MFPL & (~SYS_GPB_MFPL_PB2MFP_Msk) ) | SYS_GPB_MFPL_PB2MFP_EBI_AD4; /* AD4 = PB2 */
SYS->GPA_MFPH = (SYS->GPA_MFPH & (~SYS_GPA_MFPH_PA14MFP_Msk) ) | SYS_GPA_MFPH_PA14MFP_EBI_AD3; /* AD3. = PA14 */
SYS->GPA_MFPH = (SYS->GPA_MFPH & (~SYS_GPA_MFPH_PA13MFP_Msk) ) | SYS_GPA_MFPH_PA13MFP_EBI_AD2; /* AD2. = PA13 */
SYS->GPA_MFPH = (SYS->GPA_MFPH & (~SYS_GPA_MFPH_PA12MFP_Msk) ) | SYS_GPA_MFPH_PA12MFP_EBI_AD1; /* AD1. = PA12 */
SYS->GPA_MFPH = (SYS->GPA_MFPH & (~SYS_GPA_MFPH_PA11MFP_Msk) ) | SYS_GPA_MFPH_PA11MFP_EBI_AD0; /* AD0. = PA11 */
SYS->GPE_MFPL = (SYS->GPE_MFPL & (~SYS_GPE_MFPL_PE6MFP_Msk) ) | SYS_GPE_MFPL_PE6MFP_EBI_nWR; /* PE.6 = nWR */
SYS->GPE_MFPL = (SYS->GPE_MFPL & (~SYS_GPE_MFPL_PE7MFP_Msk) ) | SYS_GPE_MFPL_PE7MFP_EBI_nRD; /* PE.7 = nRD */
SYS->GPE_MFPH = (SYS->GPE_MFPH & (~SYS_GPE_MFPH_PE8MFP_Msk) ) | SYS_GPE_MFPH_PE8MFP_EBI_ALE; /* PE.8 = ALE */
SYS->GPE_MFPH = (SYS->GPE_MFPH & (~SYS_GPE_MFPH_PE9MFP_Msk) ) | SYS_GPE_MFPH_PE9MFP_EBI_nWRH; /* PE.9 = WRH */
SYS->GPE_MFPH = (SYS->GPE_MFPH & (~SYS_GPE_MFPH_PE10MFP_Msk) ) | SYS_GPE_MFPH_PE10MFP_EBI_nWRL; /* PE.10 = WRL */
SYS->GPE_MFPH = (SYS->GPE_MFPH & (~SYS_GPE_MFPH_PE11MFP_Msk) ) | SYS_GPE_MFPH_PE11MFP_EBI_nCS0; /* PE.11 = nCS0 */
SYS->GPE_MFPH = (SYS->GPE_MFPH & (~SYS_GPE_MFPH_PE12MFP_Msk) ) | SYS_GPE_MFPH_PE12MFP_EBI_nCS1; /* PE.12 = nCS1 */
SYS->GPE_MFPH = (SYS->GPE_MFPH & (~SYS_GPE_MFPH_PE13MFP_Msk) ) | SYS_GPE_MFPH_PE13MFP_EBI_nCS2; /* PE.13 = nCS2 */
SYS->GPE_MFPH = (SYS->GPE_MFPH & (~SYS_GPE_MFPH_PE14MFP_Msk) ) | SYS_GPE_MFPH_PE14MFP_EBI_nCS3; /* PE.14 = nCS3 */
const uint32_t u32Timing = 0x21C;
/* Open EBI interface */
EBI_Open(EBI_BANK0, EBI_BUSWIDTH_16BIT, EBI_TIMING_FAST, EBI_SEPARATEMODE_DISABLE, EBI_CS_ACTIVE_LOW);
EBI_Open(EBI_BANK1, EBI_BUSWIDTH_16BIT, EBI_TIMING_FAST, EBI_SEPARATEMODE_DISABLE, EBI_CS_ACTIVE_LOW);
EBI_Open(EBI_BANK2, EBI_BUSWIDTH_16BIT, EBI_TIMING_FAST, EBI_SEPARATEMODE_DISABLE, EBI_CS_ACTIVE_LOW);
EBI_Open(EBI_BANK3, EBI_BUSWIDTH_16BIT, EBI_TIMING_FAST, EBI_SEPARATEMODE_DISABLE, EBI_CS_ACTIVE_LOW);
/* Configure EBI timing */
EBI_SetBusTiming(EBI_BANK0, u32Timing, EBI_MCLKDIV_2);
EBI_SetBusTiming(EBI_BANK1, u32Timing, EBI_MCLKDIV_2);
EBI_SetBusTiming(EBI_BANK2, u32Timing, EBI_MCLKDIV_2);
EBI_SetBusTiming(EBI_BANK3, u32Timing, EBI_MCLKDIV_2);
}
#endif
/*** (C) COPYRIGHT 2013 Nuvoton Technology Corp. ***/
