/* ** ################################################################### ** Processors: MK22FN512CAP12 ** MK22FN512VDC12 ** MK22FN512VFX12 ** MK22FN512VLH12 ** MK22FN512VLL12 ** MK22FN512VMP12 ** ** Compilers: Freescale C/C++ for Embedded ARM ** GNU C Compiler ** IAR ANSI C/C++ Compiler for ARM ** Keil ARM C/C++ Compiler ** MCUXpresso Compiler ** ** Reference manual: K22P121M120SF7RM, Rev. 1, March 24, 2014 ** Version: rev. 2.9, 2016-03-21 ** Build: b181105 ** ** 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 2016 Freescale Semiconductor, Inc. ** Copyright 2016-2018 NXP ** All rights reserved. ** ** SPDX-License-Identifier: BSD-3-Clause ** ** http: www.nxp.com ** mail: support@nxp.com ** ** Revisions: ** - rev. 1.0 (2013-07-23) ** Initial version. ** - rev. 1.1 (2013-09-17) ** RM rev. 0.4 update. ** - 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. ** - rev. 2.1 (2013-10-30) ** Definition of BITBAND macros updated to support peripherals with 32-bit acces disabled. ** - rev. 2.2 (2013-12-20) ** Update according to reference manual rev. 0.6, ** - rev. 2.3 (2014-01-13) ** Update according to reference manual rev. 0.61, ** - rev. 2.4 (2014-02-10) ** The declaration of clock configurations has been moved to separate header file system_MK22F51212.h ** - rev. 2.5 (2014-05-06) ** Update according to reference manual rev. 1.0, ** Update of system and startup files. ** Module access macro module_BASES replaced by module_BASE_PTRS. ** - rev. 2.6 (2014-08-28) ** Update of system files - default clock configuration changed. ** Update of startup files - possibility to override DefaultISR added. ** - rev. 2.7 (2014-10-14) ** Interrupt INT_LPTimer renamed to INT_LPTMR0, interrupt INT_Watchdog renamed to INT_WDOG_EWM. ** - rev. 2.8 (2015-02-19) ** Renamed interrupt vector LLW to LLWU. ** - rev. 2.9 (2016-03-21) ** Added MK22FN512VFX12 part. ** GPIO - renamed port instances: PTx -> GPIOx. ** ** ################################################################### */ /*! * @file MK22F51212 * @version 2.9 * @date 2016-03-21 * @brief Device specific configuration file for MK22F51212 (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 #include "fsl_device_registers.h" /* ---------------------------------------------------------------------------- -- 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) /* 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) */ SystemInitHook(); } /* ---------------------------------------------------------------------------- -- SystemCoreClockUpdate() ---------------------------------------------------------------------------- */ void SystemCoreClockUpdate (void) { uint32_t MCGOUTClock; /* Variable to store output clock frequency of the MCG module */ uint16_t Divider; uint8_t tmpC7 = 0; if ((MCG->C1 & MCG_C1_CLKS_MASK) == 0x00U) { /* Output of FLL or PLL is selected */ if ((MCG->C6 & MCG_C6_PLLS_MASK) == 0x00U) { /* FLL is selected */ if ((MCG->C1 & MCG_C1_IREFS_MASK) == 0x00U) { /* External reference clock is selected */ switch (MCG->C7 & MCG_C7_OSCSEL_MASK) { case 0x00U: MCGOUTClock = CPU_XTAL_CLK_HZ; /* System oscillator drives MCG clock */ break; case 0x01U: MCGOUTClock = CPU_XTAL32k_CLK_HZ; /* RTC 32 kHz oscillator drives MCG clock */ break; case 0x02U: default: MCGOUTClock = CPU_INT_IRC_CLK_HZ; /* IRC 48MHz oscillator drives MCG clock */ break; } tmpC7 = MCG->C7; if (((MCG->C2 & MCG_C2_RANGE_MASK) != 0x00U) && ((tmpC7 & MCG_C7_OSCSEL_MASK) != 0x01U)) { switch (MCG->C1 & MCG_C1_FRDIV_MASK) { case 0x38U: Divider = 1536U; break; case 0x30U: Divider = 1280U; break; default: Divider = (uint16_t)(32LU << ((MCG->C1 & MCG_C1_FRDIV_MASK) >> MCG_C1_FRDIV_SHIFT)); break; } } else {/* ((MCG->C2 & MCG_C2_RANGE_MASK) != 0x00U) */ Divider = (uint16_t)(1LU << ((MCG->C1 & MCG_C1_FRDIV_MASK) >> MCG_C1_FRDIV_SHIFT)); } MCGOUTClock = (MCGOUTClock / Divider); /* Calculate the divided FLL reference clock */ } else { /* (!((MCG->C1 & MCG_C1_IREFS_MASK) == 0x00U)) */ MCGOUTClock = CPU_INT_SLOW_CLK_HZ; /* The slow internal reference clock is selected */ } /* (!((MCG->C1 & MCG_C1_IREFS_MASK) == 0x00U)) */ /* Select correct multiplier to calculate the MCG output clock */ switch (MCG->C4 & (MCG_C4_DMX32_MASK | MCG_C4_DRST_DRS_MASK)) { case 0x00U: 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: MCGOUTClock *= 640U; break; } } else { /* (!((MCG->C6 & MCG_C6_PLLS_MASK) == 0x00U)) */ /* PLL is selected */ Divider = (((uint16_t)MCG->C5 & MCG_C5_PRDIV0_MASK) + 0x01U); MCGOUTClock = (uint32_t)(CPU_XTAL_CLK_HZ / Divider); /* Calculate the PLL reference clock */ Divider = (((uint16_t)MCG->C6 & MCG_C6_VDIV0_MASK) + 24U); MCGOUTClock *= Divider; /* Calculate the MCG output clock */ } /* (!((MCG->C6 & MCG_C6_PLLS_MASK) == 0x00U)) */ } else if ((MCG->C1 & MCG_C1_CLKS_MASK) == 0x40U) { /* Internal reference clock is selected */ if ((MCG->C2 & MCG_C2_IRCS_MASK) == 0x00U) { MCGOUTClock = CPU_INT_SLOW_CLK_HZ; /* Slow internal reference clock selected */ } else { /* (!((MCG->C2 & MCG_C2_IRCS_MASK) == 0x00U)) */ Divider = (uint16_t)(0x01LU << ((MCG->SC & MCG_SC_FCRDIV_MASK) >> MCG_SC_FCRDIV_SHIFT)); MCGOUTClock = (uint32_t) (CPU_INT_FAST_CLK_HZ / Divider); /* Fast internal reference clock selected */ } /* (!((MCG->C2 & MCG_C2_IRCS_MASK) == 0x00U)) */ } else if ((MCG->C1 & MCG_C1_CLKS_MASK) == 0x80U) { /* External reference clock is selected */ switch (MCG->C7 & MCG_C7_OSCSEL_MASK) { case 0x00U: MCGOUTClock = CPU_XTAL_CLK_HZ; /* System oscillator drives MCG clock */ break; case 0x01U: MCGOUTClock = CPU_XTAL32k_CLK_HZ; /* RTC 32 kHz oscillator drives MCG clock */ break; case 0x02U: default: MCGOUTClock = CPU_INT_IRC_CLK_HZ; /* IRC 48MHz oscillator drives MCG clock */ break; } } else { /* (!((MCG->C1 & MCG_C1_CLKS_MASK) == 0x80U)) */ /* Reserved value */ return; } /* (!((MCG->C1 & MCG_C1_CLKS_MASK) == 0x80U)) */ SystemCoreClock = (MCGOUTClock / (0x01U + ((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV1_MASK) >> SIM_CLKDIV1_OUTDIV1_SHIFT))); } /* ---------------------------------------------------------------------------- -- SystemInitHook() ---------------------------------------------------------------------------- */ __attribute__ ((weak)) void SystemInitHook (void) { /* Void implementation of the weak function. */ }