mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
Diff: targets/cmsis/TARGET_Freescale/TARGET_MCU_K64F/system_MK64F12.c
- Revision:
- 320:be04b2b1e3f2
- Parent:
- 146:f64d43ff0c18
diff -r b6f57f64aae2 -r be04b2b1e3f2 targets/cmsis/TARGET_Freescale/TARGET_MCU_K64F/system_MK64F12.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/cmsis/TARGET_Freescale/TARGET_MCU_K64F/system_MK64F12.c Thu Sep 11 17:00:08 2014 +0100 @@ -0,0 +1,422 @@ +/* +** ################################################################### +** Processor: MK64FN1M0VMD12 +** Compilers: ARM Compiler +** Freescale C/C++ for Embedded ARM +** GNU C Compiler +** GNU C Compiler - CodeSourcery Sourcery G++ +** IAR ANSI C/C++ Compiler for ARM +** +** Reference manual: K64P144M120SF5RM, Rev.1, July 2013 +** Version: rev. 2.1, 2013-10-29 +** +** Abstract: +** Provides a system configuration function and a global variable that +** contains the system frequency. It configures the device and initializes +** the oscillator (PLL) that is part of the microcontroller device. +** +** Copyright: 2013 Freescale, Inc. All Rights Reserved. +** +** http: www.freescale.com +** mail: support@freescale.com +** +** Revisions: +** - rev. 1.0 (2013-08-12) +** Initial version. +** - rev. 2.0 (2013-10-29) +** Register accessor macros added to the memory map. +** Symbols for Processor Expert memory map compatibility added to the memory map. +** Startup file for gcc has been updated according to CMSIS 3.2. +** System initialization updated. +** MCG - registers updated. +** PORTA, PORTB, PORTC, PORTE - registers for digital filter removed. +** - rev. 2.1 (2013-10-29) +** Definition of BITBAND macros updated to support peripherals with 32-bit acces disabled. +** +** ################################################################### +*/ + +/*! + * @file MK64F12 + * @version 2.1 + * @date 2013-10-29 + * @brief Device specific configuration file for MK64F12 (implementation file) + * + * Provides a system configuration function and a global variable that contains + * the system frequency. It configures the device and initializes the oscillator + * (PLL) that is part of the microcontroller device. + */ + +#include <stdint.h> +#include "MK64F12.h" + +#define DISABLE_WDOG 1 + +#ifndef CLOCK_SETUP +#define CLOCK_SETUP 4 +#endif +/* Predefined clock setups + 0 ... Multipurpose Clock Generator (MCG) in FLL Engaged Internal (FEI) mode + Default part configuration. + Reference clock source for MCG module is the slow internal clock source 32.768kHz + Core clock = 20.97MHz, BusClock = 20.97MHz + 1 ... Multipurpose Clock Generator (MCG) in PLL Engaged External (PEE) mode + Maximum achievable clock frequency configuration. + Reference clock source for MCG module is an external clock source 50MHz + Core clock = 120MHz, BusClock = 60MHz + 2 ... Multipurpose Clock Generator (MCG) in Bypassed Low Power Internal (BLPI) mode + Core clock/Bus clock derived directly from an fast internal clock 4MHz with no multiplication + The clock settings is ready for Very Low Power Run mode. + Core clock = 4MHz, BusClock = 4MHz + 3 ... Multipurpose Clock Generator (MCG) in Bypassed Low Power External (BLPE) mode + Core clock/Bus clock derived directly from the RTC oscillator clock source 32.768kHz + The clock settings is ready for Very Low Power Run mode. + Core clock = 32.768kHz, BusClock = 32.768kHz + 4 ... Multipurpose Clock Generator (MCG) in PLL Engaged External (PEE) mode + USB clock setup + USB clock divider is set for USB to receive 48MHz input clock. + Reference clock source for MCG module is an external clock source 50MHz + USB clock divider is set for USB to receive 48MHz input clock. + Core clock = 120MHz, BusClock = 60MHz +*/ + +/*---------------------------------------------------------------------------- + Define clock source values + *----------------------------------------------------------------------------*/ +#if (CLOCK_SETUP == 0) + #define CPU_XTAL_CLK_HZ 50000000u /* Value of the external crystal or oscillator clock frequency in Hz */ + #define CPU_XTAL32k_CLK_HZ 32768u /* Value of the external 32k crystal or oscillator clock frequency in Hz */ + #define CPU_INT_SLOW_CLK_HZ 32768u /* Value of the slow internal oscillator clock frequency in Hz */ + #define CPU_INT_FAST_CLK_HZ 4000000u /* Value of the fast internal oscillator clock frequency in Hz */ + #define DEFAULT_SYSTEM_CLOCK 20485760u /* Default System clock value */ +#elif (CLOCK_SETUP == 1) + #define CPU_XTAL_CLK_HZ 50000000u /* Value of the external crystal or oscillator clock frequency in Hz */ + #define CPU_XTAL32k_CLK_HZ 32768u /* Value of the external 32k crystal or oscillator clock frequency in Hz */ + #define CPU_INT_SLOW_CLK_HZ 32768u /* Value of the slow internal oscillator clock frequency in Hz */ + #define CPU_INT_FAST_CLK_HZ 4000000u /* Value of the fast internal oscillator clock frequency in Hz */ + #define DEFAULT_SYSTEM_CLOCK 120000000u /* Default System clock value */ +#elif (CLOCK_SETUP == 2) + #define CPU_XTAL_CLK_HZ 50000000u /* Value of the external crystal or oscillator clock frequency in Hz */ + #define CPU_XTAL32k_CLK_HZ 32768u /* Value of the external 32k crystal or oscillator clock frequency in Hz */ + #define CPU_INT_SLOW_CLK_HZ 32768u /* Value of the slow internal oscillator clock frequency in Hz */ + #define CPU_INT_FAST_CLK_HZ 4000000u /* Value of the fast internal oscillator clock frequency in Hz */ + #define DEFAULT_SYSTEM_CLOCK 4000000u /* Default System clock value */ +#elif (CLOCK_SETUP == 3) + #define CPU_XTAL_CLK_HZ 50000000u /* Value of the external crystal or oscillator clock frequency in Hz */ + #define CPU_XTAL32k_CLK_HZ 32768u /* Value of the external 32k crystal or oscillator clock frequency in Hz */ + #define CPU_INT_SLOW_CLK_HZ 32768u /* Value of the slow internal oscillator clock frequency in Hz */ + #define CPU_INT_FAST_CLK_HZ 4000000u /* Value of the fast internal oscillator clock frequency in Hz */ + #define DEFAULT_SYSTEM_CLOCK 32768u /* Default System clock value */ +#elif (CLOCK_SETUP == 4) + #define CPU_XTAL_CLK_HZ 50000000u /* Value of the external crystal or oscillator clock frequency in Hz */ + #define CPU_XTAL32k_CLK_HZ 32768u /* Value of the external 32k crystal or oscillator clock frequency in Hz */ + #define CPU_INT_SLOW_CLK_HZ 32768u /* Value of the slow internal oscillator clock frequency in Hz */ + #define CPU_INT_FAST_CLK_HZ 4000000u /* Value of the fast internal oscillator clock frequency in Hz */ + #define DEFAULT_SYSTEM_CLOCK 120000000u /* Default System clock value */ +#endif /* (CLOCK_SETUP == 4) */ + + +/* ---------------------------------------------------------------------------- + -- Core clock + ---------------------------------------------------------------------------- */ + +uint32_t SystemCoreClock = DEFAULT_SYSTEM_CLOCK; + +/* ---------------------------------------------------------------------------- + -- SystemInit() + ---------------------------------------------------------------------------- */ + +void SystemInit (void) { +#if ((__FPU_PRESENT == 1) && (__FPU_USED == 1)) + SCB->CPACR |= ((3UL << 10*2) | (3UL << 11*2)); /* set CP10, CP11 Full Access */ +#endif /* ((__FPU_PRESENT == 1) && (__FPU_USED == 1)) */ +#if (DISABLE_WDOG) + /* Disable the WDOG module */ + /* WDOG->UNLOCK: WDOGUNLOCK=0xC520 */ + WDOG->UNLOCK = WDOG_UNLOCK_WDOGUNLOCK(0xC520); /* Key 1 */ + /* WDOG->UNLOCK: WDOGUNLOCK=0xD928 */ + WDOG->UNLOCK = WDOG_UNLOCK_WDOGUNLOCK(0xD928); /* Key 2 */ + /* WDOG->STCTRLH: ?=0,DISTESTWDOG=0,BYTESEL=0,TESTSEL=0,TESTWDOG=0,?=0,?=1,WAITEN=1,STOPEN=1,DBGEN=0,ALLOWUPDATE=1,WINEN=0,IRQRSTEN=0,CLKSRC=1,WDOGEN=0 */ + WDOG->STCTRLH = WDOG_STCTRLH_BYTESEL(0x00) | + WDOG_STCTRLH_WAITEN_MASK | + WDOG_STCTRLH_STOPEN_MASK | + WDOG_STCTRLH_ALLOWUPDATE_MASK | + WDOG_STCTRLH_CLKSRC_MASK | + 0x0100U; +#endif /* (DISABLE_WDOG) */ + + /* + * Release hold with ACKISO: Only has an effect if recovering from VLLSx. + * if ACKISO is set you must clear ackiso before initializing the PLL + * if osc enabled in low power modes - enable it first before ack + */ + if (PMC->REGSC & PMC_REGSC_ACKISO_MASK) + { + PMC->REGSC |= PMC_REGSC_ACKISO_MASK; + } + +#if (CLOCK_SETUP == 0) + /* SIM->CLKDIV1: OUTDIV1=0,OUTDIV2=0,OUTDIV3=1,OUTDIV4=1,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0 */ + SIM->CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0x00) | + SIM_CLKDIV1_OUTDIV2(0x00) | + SIM_CLKDIV1_OUTDIV3(0x01) | + SIM_CLKDIV1_OUTDIV4(0x01); /* Update system prescalers */ + /* SIM->SOPT2: PLLFLLSEL=0 */ + SIM->SOPT2 &= (uint32_t)~(uint32_t)(SIM_SOPT2_PLLFLLSEL_MASK); /* Select FLL as a clock source for various peripherals */ + /* SIM->SOPT1: OSC32KSEL=3 */ + SIM->SOPT1 |= SIM_SOPT1_OSC32KSEL(0x03); /* LPO 1kHz oscillator drives 32 kHz clock for various peripherals */ + /* Switch to FEI Mode */ + /* MCG->C1: CLKS=0,FRDIV=0,IREFS=1,IRCLKEN=1,IREFSTEN=0 */ + MCG->C1 = MCG_C1_CLKS(0x00) | + MCG_C1_FRDIV(0x00) | + MCG_C1_IREFS_MASK | + MCG_C1_IRCLKEN_MASK; + /* MCG->C2: LOCRE0=0,?=0,RANGE0=0,HGO0=0,EREFS0=0,LP=0,IRCS=0 */ + MCG->C2 = MCG_C2_RANGE0(0x00); + /* MCG->C4: DMX32=0,DRST_DRS=0 */ + MCG->C4 &= (uint8_t)~(uint8_t)((MCG_C4_DMX32_MASK | MCG_C4_DRST_DRS(0x03))); + /* OSC->CR: ERCLKEN=1,?=0,EREFSTEN=0,?=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */ + OSC->CR = OSC_CR_ERCLKEN_MASK; + /* MCG->C7: OSCSEL=0 */ + MCG->C7 &= (uint8_t)~(uint8_t)(MCG_C7_OSCSEL_MASK); + /* MCG->C5: ?=0,PLLCLKEN0=0,PLLSTEN0=0,PRDIV0=0 */ + MCG->C5 = MCG_C5_PRDIV0(0x00); + /* MCG->C6: LOLIE0=0,PLLS=0,CME0=0,VDIV0=0 */ + MCG->C6 = MCG_C6_VDIV0(0x00); + while((MCG->S & MCG_S_IREFST_MASK) == 0x00U) { /* Check that the source of the FLL reference clock is the internal reference clock. */ + } + while((MCG->S & 0x0CU) != 0x00U) { /* Wait until output of the FLL is selected */ + } +#elif (CLOCK_SETUP == 1) || (CLOCK_SETUP == 4) + /* SIM->SCGC5: PORTA=1 */ + SIM->SCGC5 |= SIM_SCGC5_PORTA_MASK; /* Enable clock gate for ports to enable pin routing */ + /* SIM->CLKDIV1: OUTDIV1=0,OUTDIV2=1,OUTDIV3=1,OUTDIV4=4,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0 */ + SIM->CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0x00) | + SIM_CLKDIV1_OUTDIV2(0x01) | + SIM_CLKDIV1_OUTDIV3(0x02) | + SIM_CLKDIV1_OUTDIV4(0x04); /* Update system prescalers */ + /* SIM->SOPT2: PLLFLLSEL=1 */ + SIM->SOPT2 |= SIM_SOPT2_PLLFLLSEL_MASK; /* Select PLL as a clock source for various peripherals */ + /* SIM->SOPT1: OSC32KSEL=3 */ + SIM->SOPT1 |= SIM_SOPT1_OSC32KSEL(0x03); /* LPO 1kHz oscillator drives 32 kHz clock for various peripherals */ + /* PORTA->PCR[18]: ISF=0,MUX=0 */ + PORTA->PCR[18] &= (uint32_t)~(uint32_t)((PORT_PCR_ISF_MASK | PORT_PCR_MUX(0x07))); + /* Switch to FBE Mode */ + /* MCG->C2: LOCRE0=0,?=0,RANGE0=2,HGO0=0,EREFS0=0,LP=0,IRCS=0 */ + MCG->C2 = MCG_C2_RANGE0(0x02); + /* OSC->CR: ERCLKEN=1,?=0,EREFSTEN=0,?=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */ + OSC->CR = OSC_CR_ERCLKEN_MASK; + /* MCG->C7: OSCSEL=0 */ + MCG->C7 &= (uint8_t)~(uint8_t)(MCG_C7_OSCSEL_MASK); + /* MCG->C1: CLKS=2,FRDIV=5,IREFS=0,IRCLKEN=1,IREFSTEN=0 */ + MCG->C1 = (MCG_C1_CLKS(0x02) | MCG_C1_FRDIV(0x07) | MCG_C1_IRCLKEN_MASK); + /* MCG->C4: DMX32=0,DRST_DRS=0 */ + MCG->C4 &= (uint8_t)~(uint8_t)((MCG_C4_DMX32_MASK | MCG_C4_DRST_DRS(0x03))); + /* MCG->C5: ?=0,PLLCLKEN0=0,PLLSTEN0=0,PRDIV0=0x13 */ + MCG->C5 = MCG_C5_PRDIV0(0x13); + /* MCG->C6: LOLIE0=0,PLLS=0,CME0=0,VDIV0=0x18 */ + MCG->C6 = MCG_C6_VDIV0(0x18); + while((MCG->S & MCG_S_IREFST_MASK) != 0x00U) { /* Check that the source of the FLL reference clock is the external reference clock. */ + } + while((MCG->S & 0x0CU) != 0x08U) { /* Wait until external reference clock is selected as MCG output */ + } + /* Switch to PBE Mode */ + /* MCG->C6: LOLIE0=0,PLLS=1,CME0=0,VDIV0=0x18 */ + MCG->C6 = (MCG_C6_PLLS_MASK | MCG_C6_VDIV0(0x18)); + while((MCG->S & 0x0CU) != 0x08U) { /* Wait until external reference clock is selected as MCG output */ + } + while((MCG->S & MCG_S_LOCK0_MASK) == 0x00U) { /* Wait until locked */ + } + /* Switch to PEE Mode */ + /* MCG->C1: CLKS=0,FRDIV=5,IREFS=0,IRCLKEN=1,IREFSTEN=0 */ + MCG->C1 = (MCG_C1_CLKS(0x00) | MCG_C1_FRDIV(0x05) | MCG_C1_IRCLKEN_MASK); + while((MCG->S & 0x0CU) != 0x0CU) { /* Wait until output of the PLL is selected */ + } + #if (CLOCK_SETUP == 4) + /* Set USB input clock to 48MHz */ + /* SIM->CLKDIV2: USBDIV=4,USBFRAC=1 */ + SIM->CLKDIV2 = (uint32_t)((SIM->CLKDIV2 & (uint32_t)~(uint32_t)( + SIM_CLKDIV2_USBDIV(0x03) + )) | (uint32_t)( + SIM_CLKDIV2_USBDIV(0x04) | + SIM_CLKDIV2_USBFRAC_MASK + )); + #endif +#elif (CLOCK_SETUP == 2) + /* SIM->CLKDIV1: OUTDIV1=0,OUTDIV2=0,OUTDIV3=0,OUTDIV4=4,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0 */ + SIM->CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0x00) | + SIM_CLKDIV1_OUTDIV2(0x00) | + SIM_CLKDIV1_OUTDIV3(0x00) | + SIM_CLKDIV1_OUTDIV4(0x04); /* Update system prescalers */ + /* SIM->SOPT2: PLLFLLSEL=0 */ + SIM->SOPT2 &= (uint32_t)~(uint32_t)(SIM_SOPT2_PLLFLLSEL_MASK); /* Select FLL as a clock source for various peripherals */ + /* SIM->SOPT1: OSC32KSEL=3 */ + SIM->SOPT1 |= SIM_SOPT1_OSC32KSEL(0x03); /* LPO 1kHz oscillator drives 32 kHz clock for various peripherals */ + /* MCG->SC: FCRDIV=0 */ + MCG->SC &= (uint8_t)~(uint8_t)(MCG_SC_FCRDIV(0x07)); + /* Switch to FBI Mode */ + /* MCG->C1: CLKS=1,FRDIV=0,IREFS=1,IRCLKEN=1,IREFSTEN=0 */ + MCG->C1 = MCG_C1_CLKS(0x01) | + MCG_C1_FRDIV(0x00) | + MCG_C1_IREFS_MASK | + MCG_C1_IRCLKEN_MASK; + /* MCG->C2: LOCRE0=0,?=0,RANGE0=0,HGO0=0,EREFS0=0,LP=0,IRCS=1 */ + MCG->C2 = (MCG_C2_RANGE0(0x00) | MCG_C2_IRCS_MASK); + /* MCG->C4: DMX32=0,DRST_DRS=0 */ + MCG->C4 &= (uint8_t)~(uint8_t)((MCG_C4_DMX32_MASK | MCG_C4_DRST_DRS(0x03))); + /* OSC->CR: ERCLKEN=1,?=0,EREFSTEN=0,?=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */ + OSC->CR = OSC_CR_ERCLKEN_MASK; + /* MCG->C7: OSCSEL=0 */ + MCG->C7 &= (uint8_t)~(uint8_t)(MCG_C7_OSCSEL_MASK); + /* MCG->C5: ?=0,PLLCLKEN0=0,PLLSTEN0=0,PRDIV0=0 */ + MCG->C5 = MCG_C5_PRDIV0(0x00); + /* MCG->C6: LOLIE0=0,PLLS=0,CME0=0,VDIV0=0 */ + MCG->C6 = MCG_C6_VDIV0(0x00); + while((MCG->S & MCG_S_IREFST_MASK) == 0x00U) { /* Check that the source of the FLL reference clock is the internal reference clock. */ + } + while((MCG->S & 0x0CU) != 0x04U) { /* Wait until internal reference clock is selected as MCG output */ + } + /* Switch to BLPI Mode */ + /* MCG->C2: LOCRE0=0,?=0,RANGE0=0,HGO0=0,EREFS0=0,LP=1,IRCS=1 */ + MCG->C2 = (MCG_C2_RANGE0(0x00) | MCG_C2_LP_MASK | MCG_C2_IRCS_MASK); + while((MCG->S & MCG_S_IREFST_MASK) == 0x00U) { /* Check that the source of the FLL reference clock is the internal reference clock. */ + } + while((MCG->S & MCG_S_IRCST_MASK) == 0x00U) { /* Check that the fast external reference clock is selected. */ + } +#elif (CLOCK_SETUP == 3) + /* SIM->SCGC6: RTC=1 */ + SIM->SCGC6 |= SIM_SCGC6_RTC_MASK; + if ((RTC->CR & RTC_CR_OSCE_MASK) == 0u) { /* Only if the OSCILLATOR is not already enabled */ + /* RTC->CR: SC2P=0,SC4P=0,SC8P=0,SC16P=0 */ + RTC->CR &= (uint32_t)~(uint32_t)( + RTC_CR_SC2P_MASK | + RTC_CR_SC4P_MASK | + RTC_CR_SC8P_MASK | + RTC_CR_SC16P_MASK + ); + /* RTC->CR: OSCE=1 */ + RTC->CR |= RTC_CR_OSCE_MASK; + /* RTC->CR: CLKO=0 */ + RTC->CR &= (uint32_t)~(uint32_t)(RTC_CR_CLKO_MASK); + } + /* SIM->CLKDIV1: OUTDIV1=0,OUTDIV2=0,OUTDIV3=0,OUTDIV4=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0,?=0 */ + SIM->CLKDIV1 = SIM_CLKDIV1_OUTDIV1(0x00) | + SIM_CLKDIV1_OUTDIV2(0x00) | + SIM_CLKDIV1_OUTDIV3(0x00) | + SIM_CLKDIV1_OUTDIV4(0x00); /* Update system prescalers */ + /* SIM->SOPT1: OSC32KSEL=2 */ + SIM->SOPT1 = (uint32_t)((SIM->SOPT1 & (uint32_t)~(uint32_t)( + SIM_SOPT1_OSC32KSEL(0x01) + )) | (uint32_t)( + SIM_SOPT1_OSC32KSEL(0x02) + )); /* System oscillator drives 32 kHz clock for various peripherals */ + /* Switch to FBE Mode */ + /* MCG->C2: LOCRE0=0,?=0,RANGE0=0,HGO0=0,EREFS0=0,LP=0,IRCS=0 */ + MCG->C2 = MCG_C2_RANGE0(0x00); + /* OSC->CR: ERCLKEN=1,?=0,EREFSTEN=0,?=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */ + OSC->CR = OSC_CR_ERCLKEN_MASK; + /* MCG->C7: OSCSEL=1 */ + MCG->C7 |= MCG_C7_OSCSEL_MASK; + /* MCG->C1: CLKS=2,FRDIV=0,IREFS=0,IRCLKEN=1,IREFSTEN=0 */ + MCG->C1 = (MCG_C1_CLKS(0x02) | MCG_C1_FRDIV(0x00) | MCG_C1_IRCLKEN_MASK); + /* MCG->C4: DMX32=0,DRST_DRS=0 */ + MCG->C4 &= (uint8_t)~(uint8_t)((MCG_C4_DMX32_MASK | MCG_C4_DRST_DRS(0x03))); + /* MCG->C5: ?=0,PLLCLKEN0=0,PLLSTEN0=0,PRDIV0=0 */ + MCG->C5 = MCG_C5_PRDIV0(0x00); + /* MCG->C6: LOLIE0=0,PLLS=0,CME0=0,VDIV0=0 */ + MCG->C6 = MCG_C6_VDIV0(0x00); + while((MCG->S & MCG_S_IREFST_MASK) != 0x00U) { /* Check that the source of the FLL reference clock is the external reference clock. */ + } + while((MCG->S & 0x0CU) != 0x08U) { /* Wait until external reference clock is selected as MCG output */ + } + /* Switch to BLPE Mode */ + /* MCG->C2: LOCRE0=0,?=0,RANGE0=0,HGO0=0,EREFS0=0,LP=1,IRCS=0 */ + MCG->C2 = (MCG_C2_RANGE0(0x00) | MCG_C2_LP_MASK); + while((MCG->S & 0x0CU) != 0x08U) { /* Wait until external reference clock is selected as MCG output */ + } +#endif +} + +/* ---------------------------------------------------------------------------- + -- SystemCoreClockUpdate() + ---------------------------------------------------------------------------- */ + +void SystemCoreClockUpdate (void) { + uint32_t MCGOUTClock; /* Variable to store output clock frequency of the MCG module */ + uint8_t Divider; + + if ((MCG->C1 & MCG_C1_CLKS_MASK) == 0x0u) { + /* Output of FLL or PLL is selected */ + if ((MCG->C6 & MCG_C6_PLLS_MASK) == 0x0u) { + /* FLL is selected */ + if ((MCG->C1 & MCG_C1_IREFS_MASK) == 0x0u) { + /* External reference clock is selected */ + if ((MCG->C7 & MCG_C7_OSCSEL_MASK) == 0x0u) { + MCGOUTClock = CPU_XTAL_CLK_HZ; /* System oscillator drives MCG clock */ + } else { /* (!((MCG->C7 & MCG_C7_OSCSEL_MASK) == 0x0u)) */ + MCGOUTClock = CPU_XTAL32k_CLK_HZ; /* RTC 32 kHz oscillator drives MCG clock */ + } /* (!((MCG->C7 & MCG_C7_OSCSEL_MASK) == 0x0u)) */ + Divider = (uint8_t)(1u << ((MCG->C1 & MCG_C1_FRDIV_MASK) >> MCG_C1_FRDIV_SHIFT)); + MCGOUTClock = (MCGOUTClock / Divider); /* Calculate the divided FLL reference clock */ + if ((MCG->C2 & MCG_C2_RANGE0_MASK) != 0x0u) { + MCGOUTClock /= 32u; /* If high range is enabled, additional 32 divider is active */ + } /* ((MCG->C2 & MCG_C2_RANGE0_MASK) != 0x0u) */ + } else { /* (!((MCG->C1 & MCG_C1_IREFS_MASK) == 0x0u)) */ + MCGOUTClock = CPU_INT_SLOW_CLK_HZ; /* The slow internal reference clock is selected */ + } /* (!((MCG->C1 & MCG_C1_IREFS_MASK) == 0x0u)) */ + /* Select correct multiplier to calculate the MCG output clock */ + switch (MCG->C4 & (MCG_C4_DMX32_MASK | MCG_C4_DRST_DRS_MASK)) { + case 0x0u: + MCGOUTClock *= 640u; + break; + case 0x20u: + MCGOUTClock *= 1280u; + break; + case 0x40u: + MCGOUTClock *= 1920u; + break; + case 0x60u: + MCGOUTClock *= 2560u; + break; + case 0x80u: + MCGOUTClock *= 732u; + break; + case 0xA0u: + MCGOUTClock *= 1464u; + break; + case 0xC0u: + MCGOUTClock *= 2197u; + break; + case 0xE0u: + MCGOUTClock *= 2929u; + break; + default: + break; + } + } else { /* (!((MCG->C6 & MCG_C6_PLLS_MASK) == 0x0u)) */ + /* PLL is selected */ + Divider = (1u + (MCG->C5 & MCG_C5_PRDIV0_MASK)); + MCGOUTClock = (uint32_t)(CPU_XTAL_CLK_HZ / Divider); /* Calculate the PLL reference clock */ + Divider = ((MCG->C6 & MCG_C6_VDIV0_MASK) + 24u); + MCGOUTClock *= Divider; /* Calculate the MCG output clock */ + } /* (!((MCG->C6 & MCG_C6_PLLS_MASK) == 0x0u)) */ + } else if ((MCG->C1 & MCG_C1_CLKS_MASK) == 0x40u) { + /* Internal reference clock is selected */ + if ((MCG->C2 & MCG_C2_IRCS_MASK) == 0x0u) { + MCGOUTClock = CPU_INT_SLOW_CLK_HZ; /* Slow internal reference clock selected */ + } else { /* (!((MCG->C2 & MCG_C2_IRCS_MASK) == 0x0u)) */ + MCGOUTClock = CPU_INT_FAST_CLK_HZ / (1 << ((MCG->SC & MCG_SC_FCRDIV_MASK) >> MCG_SC_FCRDIV_SHIFT)); /* Fast internal reference clock selected */ + } /* (!((MCG->C2 & MCG_C2_IRCS_MASK) == 0x0u)) */ + } else if ((MCG->C1 & MCG_C1_CLKS_MASK) == 0x80u) { + /* External reference clock is selected */ + if ((MCG->C7 & MCG_C7_OSCSEL_MASK) == 0x0u) { + MCGOUTClock = CPU_XTAL_CLK_HZ; /* System oscillator drives MCG clock */ + } else { /* (!((MCG->C7 & MCG_C7_OSCSEL_MASK) == 0x0u)) */ + MCGOUTClock = CPU_XTAL32k_CLK_HZ; /* RTC 32 kHz oscillator drives MCG clock */ + } /* (!((MCG->C7 & MCG_C7_OSCSEL_MASK) == 0x0u)) */ + } else { /* (!((MCG->C1 & MCG_C1_CLKS_MASK) == 0x80u)) */ + /* Reserved value */ + return; + } /* (!((MCG->C1 & MCG_C1_CLKS_MASK) == 0x80u)) */ + SystemCoreClock = (MCGOUTClock / (1u + ((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV1_MASK) >> SIM_CLKDIV1_OUTDIV1_SHIFT))); +}