diff options
Diffstat (limited to 'tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_Freescale/TARGET_K20XX/TARGET_K20D50M/system_MK20D5.c')
| -rw-r--r-- | tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_Freescale/TARGET_K20XX/TARGET_K20D50M/system_MK20D5.c | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_Freescale/TARGET_K20XX/TARGET_K20D50M/system_MK20D5.c b/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_Freescale/TARGET_K20XX/TARGET_K20D50M/system_MK20D5.c new file mode 100644 index 0000000000..9cd3c16b0c --- /dev/null +++ b/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_Freescale/TARGET_K20XX/TARGET_K20D50M/system_MK20D5.c @@ -0,0 +1,278 @@ +/* +** ################################################################### +** 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: 2015 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))); +} |