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Diff: targets/cmsis/TARGET_Freescale/TARGET_K20D5M/system_MK20D5.c
- Revision:
- 255:20b371a9491b
- Parent:
- 254:181b5e179739
- Child:
- 256:76fd9a263045
--- a/targets/cmsis/TARGET_Freescale/TARGET_K20D5M/system_MK20D5.c Thu Jul 10 09:00:09 2014 +0100
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,278 +0,0 @@
-/*
-** ###################################################################
-** Compilers: ARM Compiler
-** Freescale C/C++ for Embedded ARM
-** GNU C Compiler
-** IAR ANSI C/C++ Compiler for ARM
-**
-** Reference manuals: K20P64M50SF0RM Rev. 1, Oct 2011
-** K20P32M50SF0RM Rev. 1, Oct 2011
-** K20P48M50SF0RM Rev. 1, Oct 2011
-**
-** Version: rev. 1.0, 2011-12-15
-**
-** 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: 2011 Freescale Semiconductor, Inc. All Rights Reserved.
-**
-** http: www.freescale.com
-** mail: support@freescale.com
-**
-** Revisions:
-** - rev. 1.0 (2011-12-15)
-** Initial version
-**
-** ###################################################################
-*/
-
-/**
- * @file MK20D5
- * @version 1.0
- * @date 2011-12-15
- * @brief Device specific configuration file for MK20D5 (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 "MK20D5.h"
-
-#define DISABLE_WDOG 1
-
-#define CLOCK_SETUP 1
-/* Predefined clock setups
- 0 ... Multipurpose Clock Generator (MCG) in FLL Engaged Internal (FEI) mode
- Reference clock source for MCG module is the slow internal clock source 32.768kHz
- Core clock = 41.94MHz, BusClock = 41.94MHz
- 1 ... Multipurpose Clock Generator (MCG) in PLL Engaged External (PEE) mode
- Reference clock source for MCG module is an external crystal 8MHz
- Core clock = 48MHz, BusClock = 48MHz
- 2 ... Multipurpose Clock Generator (MCG) in Bypassed Low Power External (BLPE) mode
- Core clock/Bus clock derived directly from an external crystal 8MHz with no multiplication
- Core clock = 8MHz, BusClock = 8MHz
-*/
-
-/*----------------------------------------------------------------------------
- Define clock source values
- *----------------------------------------------------------------------------*/
-#if (CLOCK_SETUP == 0)
- #define CPU_XTAL_CLK_HZ 8000000u /* 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 41943040u /* Default System clock value */
-#elif (CLOCK_SETUP == 1)
- #define CPU_XTAL_CLK_HZ 8000000u /* 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 48000000u /* Default System clock value */
-#elif (CLOCK_SETUP == 2)
- #define CPU_XTAL_CLK_HZ 8000000u /* 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 8000000u /* Default System clock value */
-#endif /* (CLOCK_SETUP == 2) */
-
-
-/* ----------------------------------------------------------------------------
- -- Core clock
- ---------------------------------------------------------------------------- */
-
-uint32_t SystemCoreClock = DEFAULT_SYSTEM_CLOCK;
-
-/* ----------------------------------------------------------------------------
- -- SystemInit()
- ---------------------------------------------------------------------------- */
-
-void SystemInit (void) {
-#if (DISABLE_WDOG)
- /* Disable the WDOG module */
- /* WDOG_UNLOCK: WDOGUNLOCK=0xC520 */
- WDOG->UNLOCK = (uint16_t)0xC520u; /* Key 1 */
- /* WDOG_UNLOCK : WDOGUNLOCK=0xD928 */
- WDOG->UNLOCK = (uint16_t)0xD928u; /* Key 2 */
- /* WDOG_STCTRLH: ??=0,DISTESTWDOG=0,BYTESEL=0,TESTSEL=0,TESTWDOG=0,??=0,STNDBYEN=1,WAITEN=1,STOPEN=1,DBGEN=0,ALLOWUPDATE=1,WINEN=0,IRQRSTEN=0,CLKSRC=1,WDOGEN=0 */
- WDOG->STCTRLH = (uint16_t)0x01D2u;
-#endif /* (DISABLE_WDOG) */
-#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 = (uint32_t)0x00110000u; /* Update system prescalers */
- /* Switch to FEI Mode */
- /* MCG->C1: CLKS=0,FRDIV=0,IREFS=1,IRCLKEN=1,IREFSTEN=0 */
- MCG->C1 = (uint8_t)0x06u;
- /* MCG->C2: ??=0,??=0,RANGE0=0,HGO=0,EREFS=0,LP=0,IRCS=0 */
- MCG->C2 = (uint8_t)0x00u;
- /* MCG_C4: DMX32=0,DRST_DRS=1 */
- MCG->C4 = (uint8_t)((MCG->C4 & (uint8_t)~(uint8_t)0xC0u) | (uint8_t)0x20u);
- /* MCG->C5: ??=0,PLLCLKEN=0,PLLSTEN=0,PRDIV0=0 */
- MCG->C5 = (uint8_t)0x00u;
- /* MCG->C6: LOLIE=0,PLLS=0,CME=0,VDIV0=0 */
- MCG->C6 = (uint8_t)0x00u;
- while((MCG->S & MCG_S_IREFST_MASK) == 0u) { /* 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)
- /* 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 = (uint32_t)0x00110000u; /* Update system prescalers */
- /* Switch to FBE Mode */
- /* OSC0->CR: ERCLKEN=0,??=0,EREFSTEN=0,??=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */
- OSC0->CR = (uint8_t)0x00u;
- /* MCG->C7: OSCSEL=0 */
- MCG->C7 = (uint8_t)0x00u;
- /* MCG->C2: ??=0,??=0,RANGE0=2,HGO=0,EREFS=1,LP=0,IRCS=0 */
- MCG->C2 = (uint8_t)0x24u;
- /* MCG->C1: CLKS=2,FRDIV=3,IREFS=0,IRCLKEN=1,IREFSTEN=0 */
- MCG->C1 = (uint8_t)0x9Au;
- /* MCG->C4: DMX32=0,DRST_DRS=0 */
- MCG->C4 &= (uint8_t)~(uint8_t)0xE0u;
- /* MCG->C5: ??=0,PLLCLKEN=0,PLLSTEN=0,PRDIV0=3 */
- MCG->C5 = (uint8_t)0x03u;
- /* MCG->C6: LOLIE=0,PLLS=0,CME=0,VDIV0=0 */
- MCG->C6 = (uint8_t)0x00u;
- while((MCG->S & MCG_S_OSCINIT0_MASK) == 0u) { /* Check that the oscillator is running */
- }
-#if 0 /* ARM: THIS CHECK IS REMOVED DUE TO BUG WITH SLOW IRC IN REV. 1.0 */
- while((MCG->S & MCG_S_IREFST_MASK) != 0u) { /* Check that the source of the FLL reference clock is the external reference clock. */
- }
-#endif
- while((MCG->S & 0x0Cu) != 0x08u) { /* Wait until external reference clock is selected as MCG output */
- }
- /* Switch to PBE Mode */
- /* MCG_C5: ??=0,PLLCLKEN=0,PLLSTEN=0,PRDIV0=3 */
- MCG->C5 = (uint8_t)0x03u;
- /* MCG->C6: LOLIE=0,PLLS=1,CME=0,VDIV0=0 */
- MCG->C6 = (uint8_t)0x40u;
- while((MCG->S & MCG_S_PLLST_MASK) == 0u) { /* Wait until the source of the PLLS clock has switched to the PLL */
- }
- while((MCG->S & MCG_S_LOCK0_MASK) == 0u) { /* Wait until locked */
- }
- /* Switch to PEE Mode */
- /* MCG->C1: CLKS=0,FRDIV=3,IREFS=0,IRCLKEN=1,IREFSTEN=0 */
- MCG->C1 = (uint8_t)0x1Au;
- while((MCG->S & 0x0Cu) != 0x0Cu) { /* Wait until output of the PLL is selected */
- }
- while((MCG->S & MCG_S_LOCK0_MASK) == 0u) { /* Wait until locked */
- }
-#elif (CLOCK_SETUP == 2)
- /* 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 = (uint32_t)0x00110000u; /* Update system prescalers */
- /* Switch to FBE Mode */
- /* OSC0->CR: ERCLKEN=0,??=0,EREFSTEN=0,??=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */
- OSC0->CR = (uint8_t)0x00u;
- /* MCG->C7: OSCSEL=0 */
- MCG->C7 = (uint8_t)0x00u;
- /* MCG->C2: ??=0,??=0,RANGE0=2,HGO=0,EREFS=1,LP=0,IRCS=0 */
- MCG->C2 = (uint8_t)0x24u;
- /* MCG->C1: CLKS=2,FRDIV=3,IREFS=0,IRCLKEN=1,IREFSTEN=0 */
- MCG->C1 = (uint8_t)0x9Au;
- /* MCG->C4: DMX32=0,DRST_DRS=0 */
- MCG->C4 &= (uint8_t)~(uint8_t)0xE0u;
- /* MCG->C5: ??=0,PLLCLKEN=0,PLLSTEN=0,PRDIV0=0 */
- MCG->C5 = (uint8_t)0x00u;
- /* MCG->C6: LOLIE=0,PLLS=0,CME=0,VDIV0=0 */
- MCG->C6 = (uint8_t)0x00u;
- while((MCG->S & MCG_S_OSCINIT0_MASK) == 0u) { /* Check that the oscillator is running */
- }
-#if 0 /* ARM: THIS CHECK IS REMOVED DUE TO BUG WITH SLOW IRC IN REV. 1.0 */
- while((MCG->S & MCG_S_IREFST_MASK) != 0u) { /* Check that the source of the FLL reference clock is the external reference clock. */
- }
-#endif
- while((MCG->S & 0x0CU) != 0x08u) { /* Wait until external reference clock is selected as MCG output */
- }
- /* Switch to BLPE Mode */
- /* MCG->C2: ??=0,??=0,RANGE0=2,HGO=0,EREFS=1,LP=0,IRCS=0 */
- MCG->C2 = (uint8_t)0x24u;
-#endif /* (CLOCK_SETUP == 2) */
-}
-
-/* ----------------------------------------------------------------------------
- -- 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)));
-}