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Diffstat (limited to 'startup/system_MK20D10.c')
| -rw-r--r-- | startup/system_MK20D10.c | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/startup/system_MK20D10.c b/startup/system_MK20D10.c new file mode 100644 index 0000000..a4d9140 --- /dev/null +++ b/startup/system_MK20D10.c @@ -0,0 +1,232 @@ +/* +** ################################################################### +** Processors: MK20DN512VLK10 +** MK20DN512VLL10 +** MK20DN512VLQ10 +** MK20DN512VMC10 +** MK20DN512VMD10 +** MK20DX128VLQ10 +** MK20DX128VMD10 +** MK20DX256VLK10 +** MK20DX256VLL10 +** MK20DX256VLQ10 +** MK20DX256VMC10 +** MK20DX256VMD10 +** +** Compilers: Keil ARM C/C++ Compiler +** Freescale C/C++ for Embedded ARM +** GNU C Compiler +** IAR ANSI C/C++ Compiler for ARM +** +** Reference manual: K20P144M100SF2V2RM Rev. 2, Jun 2012 +** Version: rev. 1.9, 2015-07-29 +** Build: b151217 +** +** 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 (c) 2015 Freescale Semiconductor, Inc. +** All rights reserved. +** +** Redistribution and use in source and binary forms, with or without modification, +** are permitted provided that the following conditions are met: +** +** o Redistributions of source code must retain the above copyright notice, this list +** of conditions and the following disclaimer. +** +** o Redistributions in binary form must reproduce the above copyright notice, this +** list of conditions and the following disclaimer in the documentation and/or +** other materials provided with the distribution. +** +** o Neither the name of Freescale Semiconductor, Inc. nor the names of its +** contributors may be used to endorse or promote products derived from this +** software without specific prior written permission. +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND +** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +** WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +** DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR +** ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +** (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON +** ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +** SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +** +** http: www.freescale.com +** mail: support@freescale.com +** +** Revisions: +** - rev. 1.0 (2012-01-03) +** Initial version +** - rev. 1.1 (2012-04-13) +** Added new #define symbol MCU_MEM_MAP_VERSION_MINOR. +** Added new #define symbols <peripheralType>_BASE_PTRS. +** - rev. 1.2 (2012-07-09) +** UART0 - Fixed register definition - CEA709.1-B (LON) registers added. +** - rev. 1.3 (2012-10-29) +** Registers updated according to the new reference manual revision - Rev. 2, Jun 2012 +** - rev. 1.4 (2013-04-05) +** Changed start of doxygen comment. +** - rev. 1.5 (2013-06-24) +** NV_FOPT register - NMI_DIS bit added. +** SPI - PCSIS bit group in MCR register updated. +** - rev. 1.6 (2014-07-23) +** Delay of 1 ms added to SystemInit() to ensure stable FLL output in FEI and FEE MCG modes. +** Predefined SystemInit() implementation updated: +** - External clock sources available on TWR board used. +** - Added 1 ms waiting loop after entering FLL engaged MCG mode. +** - rev. 1.7 (2014-08-28) +** Update of startup files - possibility to override DefaultISR added. +** - rev. 1.8 (2014-10-14) +** Renamed interrupt vector Watchdog to WDOG_EWM and LPTimer to LPTMR0 +** - rev. 1.9 (2015-07-29) +** Correction of backward compatibility. +** +** ################################################################### +*/ + +/*! + * @file MK20D10 + * @version 1.9 + * @date 2015-07-29 + * @brief Device specific configuration file for MK20D10 (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 "fsl_device_registers.h" + + + +/* ---------------------------------------------------------------------------- + -- Core clock + ---------------------------------------------------------------------------- */ + +uint32_t SystemCoreClock = DEFAULT_SYSTEM_CLOCK; + +/* ---------------------------------------------------------------------------- + -- SystemInit() + ---------------------------------------------------------------------------- */ + +void SystemInit (void) { + + /* Watchdog disable */ +#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) */ + +} + +/* ---------------------------------------------------------------------------- + -- SystemCoreClockUpdate() + ---------------------------------------------------------------------------- */ + +void SystemCoreClockUpdate (void) { + + uint32_t MCGOUTClock; /* Variable to store output clock frequency of the MCG module */ + uint16_t Divider; + + 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 */ + if((MCG->C7 & MCG_C7_OSCSEL_MASK) == 0x00U) { + MCGOUTClock = CPU_XTAL_CLK_HZ; /* System oscillator drives MCG clock */ + } else { + MCGOUTClock = CPU_XTAL32k_CLK_HZ; /* RTC 32 kHz oscillator drives MCG clock */ + } + if (((MCG->C2 & MCG_C2_RANGE0_MASK) != 0x00U) && ((MCG->C7 & 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: + 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 */ + if((MCG->C7 & MCG_C7_OSCSEL_MASK) == 0x00U) { + MCGOUTClock = CPU_XTAL_CLK_HZ; /* System oscillator drives MCG clock */ + } else { + MCGOUTClock = CPU_XTAL32k_CLK_HZ; /* RTC 32 kHz oscillator drives MCG clock */ + } + } 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))); + +} |