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/**************************************************************************//**
* @file system_XMC4400.c
* @brief CMSIS Cortex-M4 Device Peripheral Access Layer Header File
* for the Infineon XMC4500 Device Series
* @version V3.0.1 Alpha
* @date 17. September 2012
*
* @note
* Copyright (C) 2011 ARM Limited. All rights reserved.
*
* @par
* ARM Limited (ARM) is supplying this software for use with Cortex-M
* processor based microcontrollers. This file can be freely distributed
* within development tools that are supporting such ARM based processors.
*
* @par
* THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED
* OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
* ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
* CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
*
******************************************************************************/
#include <system_XMC4400.h>
#include <XMC4400.h>
/*----------------------------------------------------------------------------
Clock Variable definitions
*----------------------------------------------------------------------------*/
/*!< System Clock Frequency (Core Clock)*/
uint32_t SystemCoreClock;
/* clock definitions, do not modify! */
#define SCU_CLOCK_CRYSTAL 1
#define SCU_CLOCK_BACK_UP_FACTORY 2
#define SCU_CLOCK_BACK_UP_AUTOMATIC 3
#define HIB_CLOCK_FOSI 1
#define HIB_CLOCK_OSCULP 2
/*
//-------- <<< Use Configuration Wizard in Context Menu >>> ------------------
*/
/*--------------------- Watchdog Configuration -------------------------------
//
// <e> Watchdog Configuration
// <o1.0> Disable Watchdog
//
// </e>
*/
#define WDT_SETUP 1
#define WDTENB_nVal 0x00000001
/*--------------------- CLOCK Configuration -------------------------------
//
// <e> Main Clock Configuration
// <o1.0..1> CPU clock divider
// <0=> fCPU = fSYS
// <1=> fCPU = fSYS / 2
// <o2.0..1> Peripheral Bus clock divider
// <0=> fPB = fCPU
// <1=> fPB = fCPU / 2
// <o3.0..1> CCU Bus clock divider
// <0=> fCCU = fCPU
// <1=> fCCU = fCPU / 2
//
// </e>
//
*/
#define SCU_CLOCK_SETUP 1
#define SCU_CPUCLKCR_DIV 0x00000000
#define SCU_PBCLKCR_DIV 0x00000000
#define SCU_CCUCLKCR_DIV 0x00000000
/* not avalible in config wizzard*/
/*
* mandatory clock parameters **************************************************
*
* source for clock generation
* range: SCU_CLOCK_CRYSTAL (crystal or external clock at crystal input)
*
**************************************************************************************/
// Selection of imput lock for PLL
/*************************************************************************************/
#define SCU_PLL_CLOCK_INPUT SCU_CLOCK_CRYSTAL
//#define SCU_PLL_CLOCK_INPUT SCU_CLOCK_BACK_UP_FACTORY
//#define SCU_PLL_CLOCK_INPUT SCU_CLOCK_BACK_UP_AUTOMATIC
/*************************************************************************************/
// Standby clock selection for Backup clock source trimming
/*************************************************************************************/
#define SCU_STANDBY_CLOCK HIB_CLOCK_OSCULP
//#define SCU_STANDBY_CLOCK HIB_CLOCK_FOSI
/*************************************************************************************/
// Global clock parameters
/*************************************************************************************/
#define CLOCK_FSYS 120000000
#define CLOCK_CRYSTAL_FREQUENCY 12000000
#define CLOCK_BACK_UP 24000000
/*************************************************************************************/
/* OSC_HP setup parameters */
/*************************************************************************************/
#define SCU_OSC_HP_MODE 0xF0
#define SCU_OSCHPWDGDIV 2
/*************************************************************************************/
/* MAIN PLL setup parameters */
/*************************************************************************************/
//Divider settings for external crystal @ 12 MHz
/*************************************************************************************/
#define SCU_PLL_K1DIV 1
#define SCU_PLL_K2DIV 3
#define SCU_PLL_PDIV 1
#define SCU_PLL_NDIV 79
/*************************************************************************************/
//Divider settings for use of backup clock source trimmed
/*************************************************************************************/
//#define SCU_PLL_K1DIV 1
//#define SCU_PLL_K2DIV 3
//#define SCU_PLL_PDIV 3
//#define SCU_PLL_NDIV 79
/*************************************************************************************/
/*--------------------- USB CLOCK Configuration ---------------------------
//
// <e> USB Clock Configuration
//
// </e>
//
*/
#define SCU_USB_CLOCK_SETUP 0
/* not avalible in config wizzard*/
#define SCU_USBPLL_PDIV 0
#define SCU_USBPLL_NDIV 31
#define SCU_USBDIV 3
/*--------------------- Flash Wait State Configuration -------------------------------
//
// <e> Flash Wait State Configuration
// <o1.0..3> Flash Wait State
// <0=> 3 WS
// <1=> 4 WS
// <2=> 5 WS
// <3=> 6 WS
// </e>
//
*/
#define PMU_FLASH 1
#define PMU_FLASH_WS 0x00000000
/*--------------------- CLOCKOUT Configuration -------------------------------
//
// <e> Clock OUT Configuration
// <o1.0..1> Clockout Source Selection
// <0=> System Clock
// <2=> Divided value of USB PLL output
// <3=> Divided value of PLL Clock
// <o2.0..4> Clockout divider <1-10><#-1>
// <o3.0..1> Clockout Pin Selection
// <0=> P1.15
// <1=> P0.8
//
//
// </e>
//
*/
#define SCU_CLOCKOUT_SETUP 0
#define SCU_CLOCKOUT_SOURCE 0x00000000
#define SCU_CLOCKOUT_DIV 0x00000009
#define SCU_CLOCKOUT_PIN 0x00000001
/*----------------------------------------------------------------------------
Clock Variable definitions
*----------------------------------------------------------------------------*/
/*!< System Clock Frequency (Core Clock)*/
#if SCU_CLOCK_SETUP
uint32_t SystemCoreClock = CLOCK_FSYS;
#else
uint32_t SystemCoreClock = CLOCK_BACK_UP;
#endif
/*----------------------------------------------------------------------------
static functions declarations
*----------------------------------------------------------------------------*/
#if (SCU_CLOCK_SETUP == 1)
static int SystemClockSetup(void);
#endif
#if (SCU_USB_CLOCK_SETUP == 1)
static int USBClockSetup(void);
#endif
/**
* @brief Setup the microcontroller system.
* Initialize the PLL and update the
* SystemCoreClock variable.
* @param None
* @retval None
*/
void SystemInit(void)
{
int temp;
#if (__FPU_PRESENT == 1) && (__FPU_USED == 1)
SCB->CPACR |= ((3UL << 10*2) | /* set CP10 Full Access */
(3UL << 11*2) ); /* set CP11 Full Access */
#endif
/* Enable unaligned memory access - SCB_CCR.UNALIGN_TRP = 0 */
SCB->CCR &= ~(SCB_CCR_UNALIGN_TRP_Msk);
/* Setup the WDT */
#if WDT_SETUP
WDT->CTR &= ~WDTENB_nVal;
#endif
/* Setup the Flash Wait State */
#if PMU_FLASH
temp = FLASH0->FCON;
temp &= ~FLASH_FCON_WSPFLASH_Msk;
temp |= PMU_FLASH_WS+3;
FLASH0->FCON = temp;
#endif
/* Setup the clockout */
#if SCU_CLOCKOUT_SETUP
SCU_CLK->EXTCLKCR |= SCU_CLOCKOUT_SOURCE;
/*set PLL div for clkout */
SCU_CLK->EXTCLKCR |= SCU_CLOCKOUT_DIV<<16;
if (SCU_CLOCKOUT_PIN) {
PORT0->IOCR8 = 0x00000088; /*P0.8 --> ALT1 select + HWSEL */
PORT0->HWSEL &= (~PORT0_HWSEL_HW8_Msk);
PORT0->PDR1 &= (~PORT0_PDR1_PD8_Msk); /*set to strong driver */
}
else {
PORT1->IOCR12 = 0x88000000; /*P1.15--> ALT1 select */
PORT1->PDR1 &= (~PORT1_PDR1_PD15_Msk); /*set to strong driver */
}
#endif
/* Setup the System clock */
#if SCU_CLOCK_SETUP
SystemClockSetup();
#endif
/*----------------------------------------------------------------------------
Clock Variable definitions
*----------------------------------------------------------------------------*/
SystemCoreClockUpdate();/*!< System Clock Frequency (Core Clock)*/
/* Setup the USB PL */
#if SCU_USB_CLOCK_SETUP
USBClockSetup();
#endif
}
/**
* @brief Update SystemCoreClock according to Clock Register Values
* @note -
* @param None
* @retval None
*/
void SystemCoreClockUpdate(void)
{
unsigned int PDIV;
unsigned int NDIV;
unsigned int K2DIV;
unsigned int long VCO;
/*----------------------------------------------------------------------------
Clock Variable definitions
*----------------------------------------------------------------------------*/
if (SCU_CLK->SYSCLKCR == 0x00010000)
{
if (SCU_PLL->PLLSTAT & SCU_PLL_PLLSTAT_VCOLOCK_Msk){
/* check if PLL is locked */
/* read back divider settings */
PDIV = ((SCU_PLL->PLLCON1 & SCU_PLL_PLLCON1_PDIV_Msk)>>24)+1;
NDIV = ((SCU_PLL->PLLCON1 & SCU_PLL_PLLCON1_NDIV_Msk)>>8)+1;
K2DIV = ((SCU_PLL->PLLCON1 & SCU_PLL_PLLCON1_K2DIV_Msk)>>16)+1;
if(SCU_PLL->PLLCON2 & SCU_PLL_PLLCON2_PINSEL_Msk){
/* the selected clock is the Backup clock fofi */
VCO = (CLOCK_BACK_UP/PDIV)*NDIV;
SystemCoreClock = VCO/K2DIV;
/* in case the sysclock div is used */
SystemCoreClock = SystemCoreClock/((SCU_CLK->SYSCLKCR & SCU_CLK_SYSCLKCR_SYSDIV_Msk)+1);
}
else
{
/* the selected clock is the PLL external oscillator */
VCO = (CLOCK_CRYSTAL_FREQUENCY/PDIV)*NDIV;
SystemCoreClock = VCO/K2DIV;
/* in case the sysclock div is used */
SystemCoreClock = SystemCoreClock/((SCU_CLK->SYSCLKCR & SCU_CLK_SYSCLKCR_SYSDIV_Msk)+1);
}
}
}
else
{
SystemCoreClock = CLOCK_BACK_UP;
}
}
/**
* @brief -
* @note -
* @param None
* @retval None
*/
#if (SCU_CLOCK_SETUP == 1)
static int SystemClockSetup(void)
{
int temp;
unsigned int long VCO;
int stepping_K2DIV;
/* this weak function enables DAVE3 clock App usage */
if(AllowPLLInitByStartup()){
/* check if PLL is switched on */
if ((SCU_PLL->PLLCON0 &(SCU_PLL_PLLCON0_VCOPWD_Msk | SCU_PLL_PLLCON0_PLLPWD_Msk)) != 0){
/* enable PLL first */
SCU_PLL->PLLCON0 &= ~(SCU_PLL_PLLCON0_VCOPWD_Msk | SCU_PLL_PLLCON0_PLLPWD_Msk);
}
/* Enable OSC_HP if not already on*/
if (SCU_PLL_CLOCK_INPUT == SCU_CLOCK_CRYSTAL)
{
/********************************************************************************************************************/
/* Use external crystal for PLL clock input */
/********************************************************************************************************************/
if (SCU_OSC->OSCHPCTRL & SCU_OSC_OSCHPCTRL_MODE_Msk){
SCU_OSC->OSCHPCTRL &= ~(SCU_OSC_HP_MODE); /*enable the OSC_HP*/
/* setup OSC WDG devider */
SCU_OSC->OSCHPCTRL |= (SCU_OSCHPWDGDIV<<16);
/* select external OSC as PLL input */
SCU_PLL->PLLCON2 &= ~SCU_PLL_PLLCON2_PINSEL_Msk;
/* restart OSC Watchdog */
SCU_PLL->PLLCON0 &= ~SCU_PLL_PLLCON0_OSCRES_Msk;
/* Timeout for wait loop ~150ms */
/********************************/
SysTick->LOAD = ((5000000+100) & SysTick_LOAD_RELOAD_Msk) - 1;/* set reload register */
SysTick->VAL = 0; /* Load the SysTick Counter Value */
SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk |
SysTick_CTRL_ENABLE_Msk; /* Enable SysTick IRQ and SysTick Timer */
do
{
;/* wait for ~150ms */
}while((((SCU_PLL->PLLSTAT) & (SCU_PLL_PLLSTAT_PLLHV_Msk | SCU_PLL_PLLSTAT_PLLLV_Msk |SCU_PLL_PLLSTAT_PLLSP_Msk)) != 0x380)&&(SysTick->VAL >= 500));
SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk; /* Stop SysTick Timer */
if (((SCU_PLL->PLLSTAT) & (SCU_PLL_PLLSTAT_PLLHV_Msk | SCU_PLL_PLLSTAT_PLLLV_Msk |SCU_PLL_PLLSTAT_PLLSP_Msk)) != 0x380)
return(0);/* Return Error */
}
}
else if (SCU_PLL_CLOCK_INPUT == SCU_CLOCK_BACK_UP_FACTORY)
{
/********************************************************************************************************************/
/* Use factory trimming Back-up clock for PLL clock input */
/********************************************************************************************************************/
/* PLL Back up clock selected */
SCU_PLL->PLLCON2 |= SCU_PLL_PLLCON2_PINSEL_Msk;
}
else if (SCU_PLL_CLOCK_INPUT == SCU_CLOCK_BACK_UP_AUTOMATIC)
{
/********************************************************************************************************************/
/* Use automatic trimming Back-up clock for PLL clock input */
/********************************************************************************************************************/
/* check for HIB Domain enabled */
if((SCU_POWER->PWRSTAT & SCU_POWER_PWRSTAT_HIBEN_Msk) == 0)
SCU_POWER->PWRSET |= SCU_POWER_PWRSET_HIB_Msk; /*enable Hibernate domain*/
/* check for HIB Domain is not in reset state */
if ((SCU_RESET->RSTSTAT & SCU_RESET_RSTSTAT_HIBRS_Msk)== 1)
SCU_RESET->RSTCLR |= SCU_RESET_RSTCLR_HIBRS_Msk; /*de-assert hibernate reset*/
/* PLL Back up clock selected */
SCU_PLL->PLLCON2 |= SCU_PLL_PLLCON2_PINSEL_Msk;
if (SCU_STANDBY_CLOCK == HIB_CLOCK_FOSI)
{
/****************************************************************************************************************/
/* Use fOSI as source of the standby clock */
/****************************************************************************************************************/
SCU_HIBERNATE->HDCR &= ~SCU_HIBERNATE_HDCR_STDBYSEL_Msk;
SCU_PLL->PLLCON0 &= ~SCU_PLL_PLLCON0_FOTR_Msk;
for(temp=0;temp<=0xFFFF;temp++);
SCU_PLL->PLLCON0 |= SCU_PLL_PLLCON0_AOTREN_Msk;
}
else if (SCU_STANDBY_CLOCK == HIB_CLOCK_OSCULP)
{
/****************************************************************************************************************/
/* Use fULP as source of the standby clock */
/****************************************************************************************************************/
/*check OSCUL if running correct*/
if ((SCU_HIBERNATE->OSCULCTRL & SCU_HIBERNATE_OSCULCTRL_MODE_Msk)!= 0)
{
while (SCU_GENERAL->MIRRSTS & SCU_GENERAL_MIRRSTS_OSCULCTRL_Msk);
SCU_HIBERNATE->OSCULCTRL &= ~SCU_HIBERNATE_OSCULCTRL_MODE_Msk; /*enable OSCUL*/
/*now ceck if the clock is OK using OSCULP Oscillator Watchdog (ULPWDG)*/
/* select OSCUL clock for RTC*/
SCU_HIBERNATE->HDCR |= SCU_HIBERNATE_HDCR_RCS_Msk;
while (SCU_GENERAL->MIRRSTS & SCU_GENERAL_MIRRSTS_HDCR_Msk);
/*enable OSCULP WDG Alarm Enable*/
SCU_HIBERNATE->HDCR |= SCU_HIBERNATE_HDCR_ULPWDGEN_Msk;
while (SCU_GENERAL->MIRRSTS & SCU_GENERAL_MIRRSTS_HDCR_Msk);
/*wait now for clock is stable */
do
{
SCU_HIBERNATE->HDCLR |= SCU_HIBERNATE_HDCLR_ULPWDG_Msk;
while (SCU_GENERAL->MIRRSTS & SCU_GENERAL_MIRRSTS_HDCLR_Msk);
for(temp=0;temp<=0xFFFF;temp++);
}
while ((SCU_HIBERNATE->HDSTAT & SCU_HIBERNATE_HDSTAT_ULPWDG_Msk)==SCU_HIBERNATE_HDSTAT_ULPWDG_Msk);
SCU_HIBERNATE->HDCLR |= SCU_HIBERNATE_HDCLR_ULPWDG_Msk;
while (SCU_GENERAL->MIRRSTS & SCU_GENERAL_MIRRSTS_HDCLR_Msk);
}
// now OSCULP is running and can be used
SCU_HIBERNATE->HDCR |= SCU_HIBERNATE_HDCR_STDBYSEL_Msk;
while (SCU_GENERAL->MIRRSTS & SCU_GENERAL_MIRRSTS_HDCR_Msk);
SCU_PLL->PLLCON0 &= ~SCU_PLL_PLLCON0_FOTR_Msk;
/*TRIAL for delay loop*/
for(temp=0;temp<=0xFFFF;temp++);
SCU_PLL->PLLCON0 |= SCU_PLL_PLLCON0_AOTREN_Msk;
/*TRIAL for delay loop*/
for(temp=0;temp<=0xFFFF;temp++);
}
}
/********************************************************************************************************************/
/* Setup and look the main PLL */
/********************************************************************************************************************/
if (!(SCU_PLL->PLLSTAT & SCU_PLL_PLLSTAT_VCOLOCK_Msk)){
/* Systen is still running from internal clock */
/* select FOFI as system clock */
if((SCU_CLK->SYSCLKCR & SCU_CLK_SYSCLKCR_SYSSEL_Msk) != 0x0)SCU_CLK->SYSCLKCR &= ~SCU_CLK_SYSCLKCR_SYSSEL_Msk; /*Select FOFI*/
/*calulation for stepping*/
if (SCU_PLL_CLOCK_INPUT == SCU_CLOCK_CRYSTAL)VCO = (CLOCK_CRYSTAL_FREQUENCY/(SCU_PLL_PDIV+1))*(SCU_PLL_NDIV+1);
if ((SCU_PLL_CLOCK_INPUT == SCU_CLOCK_BACK_UP_AUTOMATIC) ||(SCU_PLL_CLOCK_INPUT == SCU_CLOCK_BACK_UP_FACTORY))
VCO = (CLOCK_BACK_UP/(SCU_PLL_PDIV+1))*(SCU_PLL_NDIV+1);
stepping_K2DIV = (VCO/24000000)-1;
/* Go to bypass the Main PLL */
SCU_PLL->PLLCON0 |= SCU_PLL_PLLCON0_VCOBYP_Msk;
/* disconnect OSC_HP to PLL */
SCU_PLL->PLLCON0 |= SCU_PLL_PLLCON0_FINDIS_Msk;
/* Setup devider settings for main PLL */
SCU_PLL->PLLCON1 = ((SCU_PLL_K1DIV) | (SCU_PLL_NDIV<<8) | (stepping_K2DIV<<16) | (SCU_PLL_PDIV<<24));
/* we may have to set OSCDISCDIS */
SCU_PLL->PLLCON0 |= SCU_PLL_PLLCON0_OSCDISCDIS_Msk;
/* connect OSC_HP to PLL */
SCU_PLL->PLLCON0 &= ~SCU_PLL_PLLCON0_FINDIS_Msk;
/* restart PLL Lock detection */
SCU_PLL->PLLCON0 |= SCU_PLL_PLLCON0_RESLD_Msk;
/* wait for PLL Lock */
/* setup time out loop */
/* Timeout for wait loo ~150ms */
/********************************/
SysTick->LOAD = ((5000000+100) & SysTick_LOAD_RELOAD_Msk) - 1;/* set reload register */
SysTick->VAL = 0; /* Load the SysTick Counter Value */
SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk |
SysTick_CTRL_ENABLE_Msk; /* Enable SysTick IRQ and SysTick Timer */
while ((!(SCU_PLL->PLLSTAT & SCU_PLL_PLLSTAT_VCOLOCK_Msk))&&(SysTick->VAL >= 500));
SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk; /* Stop SysTick Timer */
if ((SCU_PLL->PLLSTAT & SCU_PLL_PLLSTAT_VCOLOCK_Msk)==SCU_PLL_PLLSTAT_VCOLOCK_Msk)
{
/* Go back to the Main PLL */
SCU_PLL->PLLCON0 &= ~SCU_PLL_PLLCON0_VCOBYP_Msk;
}
else return(0);
/*********************************************************
here we need to setup the system clock divider
*********************************************************/
SCU_CLK->CPUCLKCR = SCU_CPUCLKCR_DIV;
SCU_CLK->PBCLKCR = SCU_PBCLKCR_DIV;
SCU_CLK->CCUCLKCR = SCU_CCUCLKCR_DIV;
/* Switch system clock to PLL */
SCU_CLK->SYSCLKCR |= 0x00010000;
/* we may have to reset OSCDISCDIS */
SCU_PLL->PLLCON0 &= ~SCU_PLL_PLLCON0_OSCDISCDIS_Msk;
/*********************************************************/
/* Delay for next K2 step ~50µs */
/*********************************************************/
SysTick->LOAD = ((1250+100) & SysTick_LOAD_RELOAD_Msk) - 1;/* set reload register */
SysTick->VAL = 0; /* Load the SysTick Counter Value */
SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk |
SysTick_CTRL_ENABLE_Msk; /* Enable SysTick IRQ and SysTick Timer */
while (SysTick->VAL >= 100); /* wait for ~50µs */
SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk; /* Stop SysTick Timer */
/*********************************************************/
/*********************************************************
here the ramp up of the system clock starts FSys < 60MHz
*********************************************************/
if (CLOCK_FSYS > 60000000){
/*calulation for stepping*/
if (SCU_PLL_CLOCK_INPUT == SCU_CLOCK_CRYSTAL)VCO = (CLOCK_CRYSTAL_FREQUENCY/(SCU_PLL_PDIV+1))*(SCU_PLL_NDIV+1);
if ((SCU_PLL_CLOCK_INPUT == SCU_CLOCK_BACK_UP_AUTOMATIC) ||(SCU_PLL_CLOCK_INPUT == SCU_CLOCK_BACK_UP_FACTORY))
VCO = (CLOCK_BACK_UP/(SCU_PLL_PDIV+1))*(SCU_PLL_NDIV+1);
stepping_K2DIV = (VCO/60000000)-1;
/* Setup devider settings for main PLL */
SCU_PLL->PLLCON1 = ((SCU_PLL_K1DIV) | (SCU_PLL_NDIV<<8) | (stepping_K2DIV<<16) | (SCU_PLL_PDIV<<24));
}
else
{
/* Setup devider settings for main PLL */
SCU_PLL->PLLCON1 = ((SCU_PLL_K1DIV) | (SCU_PLL_NDIV<<8) | (SCU_PLL_K2DIV<<16) | (SCU_PLL_PDIV<<24));
SCU_TRAP->TRAPCLR = SCU_TRAP_TRAPCLR_SOSCWDGT_Msk | SCU_TRAP_TRAPCLR_SVCOLCKT_Msk; /* clear request for System OCS Watchdog Trap and System VCO Lock Trap */
return(1);
}
/*********************************************************/
/* Delay for next K2 step ~50µs */
/*********************************************************/
SysTick->LOAD = ((3000+100) & SysTick_LOAD_RELOAD_Msk) - 1;
SysTick->VAL = 0; /* Load the SysTick Counter Value */
SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk |
SysTick_CTRL_ENABLE_Msk; /* Enable SysTick IRQ and SysTick Timer */
while (SysTick->VAL >= 100); /* wait for ~50µs */
SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk; /* Stop SysTick Timer */
/********************************/
/*********************************************************
here the ramp up of the system clock starts FSys < 90MHz
*********************************************************/
if (CLOCK_FSYS > 90000000){
/*calulation for stepping*/
if (SCU_PLL_CLOCK_INPUT == SCU_CLOCK_CRYSTAL)VCO = (CLOCK_CRYSTAL_FREQUENCY/(SCU_PLL_PDIV+1))*(SCU_PLL_NDIV+1);
if ((SCU_PLL_CLOCK_INPUT == SCU_CLOCK_BACK_UP_AUTOMATIC) ||(SCU_PLL_CLOCK_INPUT == SCU_CLOCK_BACK_UP_FACTORY))
VCO = (CLOCK_BACK_UP/(SCU_PLL_PDIV+1))*(SCU_PLL_NDIV+1);
stepping_K2DIV = (VCO/90000000)-1;
/* Setup devider settings for main PLL */
SCU_PLL->PLLCON1 = ((SCU_PLL_K1DIV) | (SCU_PLL_NDIV<<8) | (stepping_K2DIV<<16) | (SCU_PLL_PDIV<<24));
}
else
{
/* Setup devider settings for main PLL */
SCU_PLL->PLLCON1 = ((SCU_PLL_K1DIV) | (SCU_PLL_NDIV<<8) | (SCU_PLL_K2DIV<<16) | (SCU_PLL_PDIV<<24));
SCU_TRAP->TRAPCLR = SCU_TRAP_TRAPCLR_SOSCWDGT_Msk | SCU_TRAP_TRAPCLR_SVCOLCKT_Msk; /* clear request for System OCS Watchdog Trap and System VCO Lock Trap */
return(1);
}
/*********************************************************/
/* Delay for next K2 step ~50µs */
/*********************************************************/
SysTick->LOAD = ((4800+100) & SysTick_LOAD_RELOAD_Msk) - 1;
SysTick->VAL = 0; /* Load the SysTick Counter Value */
SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk |
SysTick_CTRL_ENABLE_Msk; /* Enable SysTick IRQ and SysTick Timer */
while (SysTick->VAL >= 100); /* wait for ~50µs */
SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk; /* Stop SysTick Timer */
/********************************/
/* Setup devider settings for main PLL */
SCU_PLL->PLLCON1 = ((SCU_PLL_K1DIV) | (SCU_PLL_NDIV<<8) | (SCU_PLL_K2DIV<<16) | (SCU_PLL_PDIV<<24));
SCU_TRAP->TRAPCLR = SCU_TRAP_TRAPCLR_SOSCWDGT_Msk | SCU_TRAP_TRAPCLR_SVCOLCKT_Msk; /* clear request for System OCS Watchdog Trap and System VCO Lock Trap */
}
}/* end this weak function enables DAVE3 clock App usage */
return(1);
}
#endif
/**
* @brief -
* @note -
* @param None
* @retval None
*/
#if (SCU_USB_CLOCK_SETUP == 1)
static int USBClockSetup(void)
{
/* this weak function enables DAVE3 clock App usage */
if(AllowPLLInitByStartup()){
/* check if PLL is switched on */
if ((SCU_PLL->USBPLLCON &(SCU_PLL_USBPLLCON_VCOPWD_Msk | SCU_PLL_USBPLLCON_PLLPWD_Msk)) != 0){
/* enable PLL first */
SCU_PLL->USBPLLCON &= ~(SCU_PLL_USBPLLCON_VCOPWD_Msk | SCU_PLL_USBPLLCON_PLLPWD_Msk);
}
/* check and if not already running enable OSC_HP */
if (SCU_OSC->OSCHPCTRL & SCU_OSC_OSCHPCTRL_MODE_Msk){
/* check if Main PLL is switched on for OSC WD*/
if ((SCU_PLL->PLLCON0 &(SCU_PLL_PLLCON0_VCOPWD_Msk | SCU_PLL_PLLCON0_PLLPWD_Msk)) != 0){
/* enable PLL first */
SCU_PLL->PLLCON0 &= ~(SCU_PLL_PLLCON0_VCOPWD_Msk | SCU_PLL_PLLCON0_PLLPWD_Msk);
}
SCU_OSC->OSCHPCTRL &= ~(SCU_OSC_HP_MODE); /*enable the OSC_HP*/
/* setup OSC WDG devider */
SCU_OSC->OSCHPCTRL |= (SCU_OSCHPWDGDIV<<16);
/* restart OSC Watchdog */
SCU_PLL->PLLCON0 &= ~SCU_PLL_PLLCON0_OSCRES_Msk;
/* Timeout for wait loop ~150ms */
/********************************/
SysTick->LOAD = ((5000000+100) & SysTick_LOAD_RELOAD_Msk) - 1;/* set reload register */
SysTick->VAL = 0; /* Load the SysTick Counter Value */
SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk |
SysTick_CTRL_ENABLE_Msk; /* Enable SysTick IRQ and SysTick Timer */
do
{
;/* wait for ~150ms */
}while((((SCU_PLL->PLLSTAT) & (SCU_PLL_PLLSTAT_PLLHV_Msk | SCU_PLL_PLLSTAT_PLLLV_Msk |SCU_PLL_PLLSTAT_PLLSP_Msk)) != 0x380)&&(SysTick->VAL >= 500));
SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk; /* Stop SysTick Timer */
if (((SCU_PLL->PLLSTAT) & (SCU_PLL_PLLSTAT_PLLHV_Msk | SCU_PLL_PLLSTAT_PLLLV_Msk |SCU_PLL_PLLSTAT_PLLSP_Msk)) != 0x380)
return(0);/* Return Error */
}
/* Setup USB PLL */
/* Go to bypass the Main PLL */
SCU_PLL->USBPLLCON |= SCU_PLL_USBPLLCON_VCOBYP_Msk;
/* disconnect OSC_FI to PLL */
SCU_PLL->USBPLLCON |= SCU_PLL_USBPLLCON_FINDIS_Msk;
/* Setup devider settings for main PLL */
SCU_PLL->USBPLLCON = ((SCU_USBPLL_NDIV<<8) | (SCU_USBPLL_PDIV<<24));
/* Setup USBDIV settings USB clock */
SCU_CLK->USBCLKCR = SCU_USBDIV;
/* we may have to set OSCDISCDIS */
SCU_PLL->USBPLLCON |= SCU_PLL_USBPLLCON_OSCDISCDIS_Msk;
/* connect OSC_FI to PLL */
SCU_PLL->USBPLLCON &= ~SCU_PLL_USBPLLCON_FINDIS_Msk;
/* restart PLL Lock detection */
SCU_PLL->USBPLLCON |= SCU_PLL_USBPLLCON_RESLD_Msk;
/* wait for PLL Lock */
while (!(SCU_PLL->USBPLLSTAT & SCU_PLL_USBPLLSTAT_VCOLOCK_Msk));
}/* end this weak function enables DAVE3 clock App usage */
return(1);
}
#endif