Akhil Nair / Mbed OS lab6p1

Final (not completed)

KL25Z_SystemInit.c@0:5ce3cfc57999, 2015-11-21 (annotated)

Committer:
Manel_Marin
Date:
Sat Nov 21 13:24:29 2015 +0000
Revision:
0:5ce3cfc57999
Child:
1:159a09ac60ba
Working fully documented example

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Manel_Marin 0:5ce3cfc57999 1 /*
Manel_Marin 0:5ce3cfc57999 2 ** ###################################################################
Manel_Marin 0:5ce3cfc57999 3 ** Processor: MKL25Z128VLK4
Manel_Marin 0:5ce3cfc57999 4 ** Compilers: ARM Compiler
Manel_Marin 0:5ce3cfc57999 5 ** Freescale C/C++ for Embedded ARM
Manel_Marin 0:5ce3cfc57999 6 ** GNU C Compiler
Manel_Marin 0:5ce3cfc57999 7 ** IAR ANSI C/C++ Compiler for ARM
Manel_Marin 0:5ce3cfc57999 8 **
Manel_Marin 0:5ce3cfc57999 9 ** Reference manual: KL25RM, Rev.1, Jun 2012
Manel_Marin 0:5ce3cfc57999 10 ** Version: rev. 1.1, 2012-06-21
Manel_Marin 0:5ce3cfc57999 11 **
Manel_Marin 0:5ce3cfc57999 12 ** Abstract:
Manel_Marin 0:5ce3cfc57999 13 ** Provides a system configuration function and a global variable that
Manel_Marin 0:5ce3cfc57999 14 ** contains the system frequency. It configures the device and initializes
Manel_Marin 0:5ce3cfc57999 15 ** the oscillator (PLL) that is part of the microcontroller device.
Manel_Marin 0:5ce3cfc57999 16 **
Manel_Marin 0:5ce3cfc57999 17 ** Copyright: 2012 Freescale Semiconductor, Inc. All Rights Reserved.
Manel_Marin 0:5ce3cfc57999 18 **
Manel_Marin 0:5ce3cfc57999 19 ** http: www.freescale.com
Manel_Marin 0:5ce3cfc57999 20 ** mail: support@freescale.com
Manel_Marin 0:5ce3cfc57999 21 **
Manel_Marin 0:5ce3cfc57999 22 ** Revisions:
Manel_Marin 0:5ce3cfc57999 23 ** - rev. 1.0 (2012-06-13)
Manel_Marin 0:5ce3cfc57999 24 ** Initial version.
Manel_Marin 0:5ce3cfc57999 25 ** - rev. 1.1 (2012-06-21)
Manel_Marin 0:5ce3cfc57999 26 ** Update according to reference manual rev. 1.
Manel_Marin 0:5ce3cfc57999 27 **
Manel_Marin 0:5ce3cfc57999 28 ** ###################################################################
Manel_Marin 0:5ce3cfc57999 29 */
Manel_Marin 0:5ce3cfc57999 30
Manel_Marin 0:5ce3cfc57999 31 /**
Manel_Marin 0:5ce3cfc57999 32 * @file MKL25Z4
Manel_Marin 0:5ce3cfc57999 33 * @version 1.1
Manel_Marin 0:5ce3cfc57999 34 * @date 2012-06-21
Manel_Marin 0:5ce3cfc57999 35 * @brief Device specific configuration file for MKL25Z4 (implementation file)
Manel_Marin 0:5ce3cfc57999 36 *
Manel_Marin 0:5ce3cfc57999 37 * Provides a system configuration function and a global variable that contains
Manel_Marin 0:5ce3cfc57999 38 * the system frequency. It configures the device and initializes the oscillator
Manel_Marin 0:5ce3cfc57999 39 * (PLL) that is part of the microcontroller device.
Manel_Marin 0:5ce3cfc57999 40 */
Manel_Marin 0:5ce3cfc57999 41
Manel_Marin 0:5ce3cfc57999 42 #include <stdint.h>
Manel_Marin 0:5ce3cfc57999 43 #include "MKL25Z4.h"
Manel_Marin 0:5ce3cfc57999 44
Manel_Marin 0:5ce3cfc57999 45 //MODIFICATION: We DO want watchdog, uC default after reset is enabled with timeout=1024ms (2^10*LPO=1KHz)
Manel_Marin 0:5ce3cfc57999 46 //#define DISABLE_WDOG 1
Manel_Marin 0:5ce3cfc57999 47
Manel_Marin 0:5ce3cfc57999 48 #define CLOCK_SETUP 1
Manel_Marin 0:5ce3cfc57999 49 /* Predefined clock setups
Manel_Marin 0:5ce3cfc57999 50 0 ... Multipurpose Clock Generator (MCG) in FLL Engaged Internal (FEI) mode
Manel_Marin 0:5ce3cfc57999 51 Reference clock source for MCG module is the slow internal clock source 32.768kHz
Manel_Marin 0:5ce3cfc57999 52 Core clock = 41.94MHz, BusClock = 13.98MHz
Manel_Marin 0:5ce3cfc57999 53 1 ... Multipurpose Clock Generator (MCG) in PLL Engaged External (PEE) mode
Manel_Marin 0:5ce3cfc57999 54 Reference clock source for MCG module is an external crystal 8MHz
Manel_Marin 0:5ce3cfc57999 55 Core clock = 48MHz, BusClock = 24MHz
Manel_Marin 0:5ce3cfc57999 56 2 ... Multipurpose Clock Generator (MCG) in Bypassed Low Power External (BLPE) mode
Manel_Marin 0:5ce3cfc57999 57 Core clock/Bus clock derived directly from an external crystal 8MHz with no multiplication
Manel_Marin 0:5ce3cfc57999 58 Core clock = 8MHz, BusClock = 8MHz
Manel_Marin 0:5ce3cfc57999 59 3 ... Multipurpose Clock Generator (MCG) in FLL Engaged External (FEE) mode
Manel_Marin 0:5ce3cfc57999 60 Reference clock source for MCG module is an external crystal 32.768kHz
Manel_Marin 0:5ce3cfc57999 61 Core clock = 47.97MHz, BusClock = 23.98MHz
Manel_Marin 0:5ce3cfc57999 62 This setup sets the RTC to be driven by the MCU clock directly without the need of an external source.
Manel_Marin 0:5ce3cfc57999 63 RTC register values are retained when MCU is reset although there will be a slight (mSec's)loss of time
Manel_Marin 0:5ce3cfc57999 64 accuracy durring the reset period. RTC will reset on power down.
Manel_Marin 0:5ce3cfc57999 65 */
Manel_Marin 0:5ce3cfc57999 66
Manel_Marin 0:5ce3cfc57999 67 /*----------------------------------------------------------------------------
Manel_Marin 0:5ce3cfc57999 68 Define clock source values
Manel_Marin 0:5ce3cfc57999 69 *----------------------------------------------------------------------------*/
Manel_Marin 0:5ce3cfc57999 70 #if (CLOCK_SETUP == 0)
Manel_Marin 0:5ce3cfc57999 71 #define CPU_XTAL_CLK_HZ 8000000u /* Value of the external crystal or oscillator clock frequency in Hz */
Manel_Marin 0:5ce3cfc57999 72 #define CPU_INT_SLOW_CLK_HZ 32768u /* Value of the slow internal oscillator clock frequency in Hz */
Manel_Marin 0:5ce3cfc57999 73 #define CPU_INT_FAST_CLK_HZ 4000000u /* Value of the fast internal oscillator clock frequency in Hz */
Manel_Marin 0:5ce3cfc57999 74 #define DEFAULT_SYSTEM_CLOCK 41943040u /* Default System clock value */
Manel_Marin 0:5ce3cfc57999 75 #elif (CLOCK_SETUP == 1)
Manel_Marin 0:5ce3cfc57999 76 #define CPU_XTAL_CLK_HZ 8000000u /* Value of the external crystal or oscillator clock frequency in Hz */
Manel_Marin 0:5ce3cfc57999 77 #define CPU_INT_SLOW_CLK_HZ 32768u /* Value of the slow internal oscillator clock frequency in Hz */
Manel_Marin 0:5ce3cfc57999 78 #define CPU_INT_FAST_CLK_HZ 4000000u /* Value of the fast internal oscillator clock frequency in Hz */
Manel_Marin 0:5ce3cfc57999 79 #define DEFAULT_SYSTEM_CLOCK 48000000u /* Default System clock value */
Manel_Marin 0:5ce3cfc57999 80 #elif (CLOCK_SETUP == 2)
Manel_Marin 0:5ce3cfc57999 81 #define CPU_XTAL_CLK_HZ 8000000u /* Value of the external crystal or oscillator clock frequency in Hz */
Manel_Marin 0:5ce3cfc57999 82 #define CPU_INT_SLOW_CLK_HZ 32768u /* Value of the slow internal oscillator clock frequency in Hz */
Manel_Marin 0:5ce3cfc57999 83 #define CPU_INT_FAST_CLK_HZ 4000000u /* Value of the fast internal oscillator clock frequency in Hz */
Manel_Marin 0:5ce3cfc57999 84 #define DEFAULT_SYSTEM_CLOCK 8000000u /* Default System clock value */
Manel_Marin 0:5ce3cfc57999 85 #elif (CLOCK_SETUP == 3)
Manel_Marin 0:5ce3cfc57999 86 #define CPU_XTAL_CLK_HZ 32768u /* Value of the external crystal or oscillator clock frequency in Hz */
Manel_Marin 0:5ce3cfc57999 87 #define CPU_INT_SLOW_CLK_HZ 32768u /* Value of the slow internal oscillator clock frequency in Hz */
Manel_Marin 0:5ce3cfc57999 88 #define CPU_INT_FAST_CLK_HZ 4000000u /* Value of the fast internal oscillator clock frequency in Hz */
Manel_Marin 0:5ce3cfc57999 89 #define DEFAULT_SYSTEM_CLOCK 47972352u /* Default System clock value */
Manel_Marin 0:5ce3cfc57999 90 #endif /* (CLOCK_SETUP == 3) */
Manel_Marin 0:5ce3cfc57999 91
Manel_Marin 0:5ce3cfc57999 92 /* ----------------------------------------------------------------------------
Manel_Marin 0:5ce3cfc57999 93 -- Core clock
Manel_Marin 0:5ce3cfc57999 94 ---------------------------------------------------------------------------- */
Manel_Marin 0:5ce3cfc57999 95
Manel_Marin 0:5ce3cfc57999 96 //MODIFICATION: That vartiable already exists
Manel_Marin 0:5ce3cfc57999 97 // uint32_t SystemCoreClock = DEFAULT_SYSTEM_CLOCK;
Manel_Marin 0:5ce3cfc57999 98
Manel_Marin 0:5ce3cfc57999 99 /* ----------------------------------------------------------------------------
Manel_Marin 0:5ce3cfc57999 100 -- SystemInit()
Manel_Marin 0:5ce3cfc57999 101 ---------------------------------------------------------------------------- */
Manel_Marin 0:5ce3cfc57999 102
Manel_Marin 0:5ce3cfc57999 103 void $Sub$$SystemInit (void) {
Manel_Marin 0:5ce3cfc57999 104
Manel_Marin 0:5ce3cfc57999 105 //MODIFICATION:
Manel_Marin 0:5ce3cfc57999 106 // That variable already exists, we set it here
Manel_Marin 0:5ce3cfc57999 107 SystemCoreClock = DEFAULT_SYSTEM_CLOCK;
Manel_Marin 0:5ce3cfc57999 108 // We want visual indication of boot time with red LED on
Manel_Marin 0:5ce3cfc57999 109 //TODO
Manel_Marin 0:5ce3cfc57999 110
Manel_Marin 0:5ce3cfc57999 111 #if (DISABLE_WDOG)
Manel_Marin 0:5ce3cfc57999 112 /* Disable the WDOG module */
Manel_Marin 0:5ce3cfc57999 113 /* SIM_COPC: COPT=0,COPCLKS=0,COPW=0 */
Manel_Marin 0:5ce3cfc57999 114 SIM->COPC = (uint32_t)0x00u;
Manel_Marin 0:5ce3cfc57999 115 #endif /* (DISABLE_WDOG) */
Manel_Marin 0:5ce3cfc57999 116 #if (CLOCK_SETUP == 0)
Manel_Marin 0:5ce3cfc57999 117 /* SIM->CLKDIV1: OUTDIV1=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,OUTDIV4=2,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0 */
Manel_Marin 0:5ce3cfc57999 118 SIM->CLKDIV1 = (uint32_t)0x00020000UL; /* Update system prescalers */
Manel_Marin 0:5ce3cfc57999 119 /* Switch to FEI Mode */
Manel_Marin 0:5ce3cfc57999 120 /* MCG->C1: CLKS=0,FRDIV=0,IREFS=1,IRCLKEN=1,IREFSTEN=0 */
Manel_Marin 0:5ce3cfc57999 121 MCG->C1 = (uint8_t)0x06U;
Manel_Marin 0:5ce3cfc57999 122 /* MCG_C2: LOCRE0=0,??=0,RANGE0=0,HGO0=0,EREFS0=0,LP=0,IRCS=0 */
Manel_Marin 0:5ce3cfc57999 123 MCG->C2 = (uint8_t)0x00U;
Manel_Marin 0:5ce3cfc57999 124 /* MCG->C4: DMX32=0,DRST_DRS=1 */
Manel_Marin 0:5ce3cfc57999 125 MCG->C4 = (uint8_t)((MCG->C4 & (uint8_t)~(uint8_t)0xC0U) | (uint8_t)0x20U);
Manel_Marin 0:5ce3cfc57999 126 /* OSC0->CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */
Manel_Marin 0:5ce3cfc57999 127 OSC0->CR = (uint8_t)0x80U;
Manel_Marin 0:5ce3cfc57999 128 /* MCG->C5: ??=0,PLLCLKEN0=0,PLLSTEN0=0,PRDIV0=0 */
Manel_Marin 0:5ce3cfc57999 129 MCG->C5 = (uint8_t)0x00U;
Manel_Marin 0:5ce3cfc57999 130 /* MCG->C6: LOLIE0=0,PLLS=0,CME0=0,VDIV0=0 */
Manel_Marin 0:5ce3cfc57999 131 MCG->C6 = (uint8_t)0x00U;
Manel_Marin 0:5ce3cfc57999 132 while((MCG->S & MCG_S_IREFST_MASK) == 0x00U) { /* Check that the source of the FLL reference clock is the internal reference clock. */
Manel_Marin 0:5ce3cfc57999 133 }
Manel_Marin 0:5ce3cfc57999 134 while((MCG->S & 0x0CU) != 0x00U) { /* Wait until output of the FLL is selected */
Manel_Marin 0:5ce3cfc57999 135 }
Manel_Marin 0:5ce3cfc57999 136 #elif (CLOCK_SETUP == 1)
Manel_Marin 0:5ce3cfc57999 137 /* SIM->SCGC5: PORTA=1 */
Manel_Marin 0:5ce3cfc57999 138 SIM->SCGC5 |= (uint32_t)0x0200UL; /* Enable clock gate for ports to enable pin routing */
Manel_Marin 0:5ce3cfc57999 139 /* SIM->CLKDIV1: OUTDIV1=1,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,OUTDIV4=1,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0 */
Manel_Marin 0:5ce3cfc57999 140 SIM->CLKDIV1 = (uint32_t)0x10010000UL; /* Update system prescalers */
Manel_Marin 0:5ce3cfc57999 141 /* PORTA->PCR18: ISF=0,MUX=0 */
Manel_Marin 0:5ce3cfc57999 142 PORTA->PCR[18] &= (uint32_t)~0x01000700UL;
Manel_Marin 0:5ce3cfc57999 143 /* PORTA->PCR19: ISF=0,MUX=0 */
Manel_Marin 0:5ce3cfc57999 144 PORTA->PCR[19] &= (uint32_t)~0x01000700UL;
Manel_Marin 0:5ce3cfc57999 145 /* Switch to FBE Mode */
Manel_Marin 0:5ce3cfc57999 146 /* OSC0->CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=1,SC4P=0,SC8P=0,SC16P=1 */
Manel_Marin 0:5ce3cfc57999 147 OSC0->CR = (uint8_t)0x89U;
Manel_Marin 0:5ce3cfc57999 148 /* MCG->C2: LOCRE0=0,??=0,RANGE0=2,HGO0=0,EREFS0=1,LP=0,IRCS=0 */
Manel_Marin 0:5ce3cfc57999 149 MCG->C2 = (uint8_t)0x24U;
Manel_Marin 0:5ce3cfc57999 150 /* MCG->C1: CLKS=2,FRDIV=3,IREFS=0,IRCLKEN=1,IREFSTEN=0 */
Manel_Marin 0:5ce3cfc57999 151 MCG->C1 = (uint8_t)0x9AU;
Manel_Marin 0:5ce3cfc57999 152 /* MCG->C4: DMX32=0,DRST_DRS=0 */
Manel_Marin 0:5ce3cfc57999 153 MCG->C4 &= (uint8_t)~(uint8_t)0xE0U;
Manel_Marin 0:5ce3cfc57999 154 /* MCG->C5: ??=0,PLLCLKEN0=0,PLLSTEN0=0,PRDIV0=1 */
Manel_Marin 0:5ce3cfc57999 155 MCG->C5 = (uint8_t)0x01U;
Manel_Marin 0:5ce3cfc57999 156 /* MCG->C6: LOLIE0=0,PLLS=0,CME0=0,VDIV0=0 */
Manel_Marin 0:5ce3cfc57999 157 MCG->C6 = (uint8_t)0x00U;
Manel_Marin 0:5ce3cfc57999 158 while((MCG->S & MCG_S_IREFST_MASK) != 0x00U) { /* Check that the source of the FLL reference clock is the external reference clock. */
Manel_Marin 0:5ce3cfc57999 159 }
Manel_Marin 0:5ce3cfc57999 160 while((MCG->S & 0x0CU) != 0x08U) { /* Wait until external reference clock is selected as MCG output */
Manel_Marin 0:5ce3cfc57999 161 }
Manel_Marin 0:5ce3cfc57999 162 /* Switch to PBE Mode */
Manel_Marin 0:5ce3cfc57999 163 /* MCG->C6: LOLIE0=0,PLLS=1,CME0=0,VDIV0=0 */
Manel_Marin 0:5ce3cfc57999 164 MCG->C6 = (uint8_t)0x40U;
Manel_Marin 0:5ce3cfc57999 165 while((MCG->S & 0x0CU) != 0x08U) { /* Wait until external reference clock is selected as MCG output */
Manel_Marin 0:5ce3cfc57999 166 }
Manel_Marin 0:5ce3cfc57999 167 while((MCG->S & MCG_S_LOCK0_MASK) == 0x00U) { /* Wait until locked */
Manel_Marin 0:5ce3cfc57999 168 }
Manel_Marin 0:5ce3cfc57999 169 /* Switch to PEE Mode */
Manel_Marin 0:5ce3cfc57999 170 /* MCG->C1: CLKS=0,FRDIV=3,IREFS=0,IRCLKEN=1,IREFSTEN=0 */
Manel_Marin 0:5ce3cfc57999 171 MCG->C1 = (uint8_t)0x1AU;
Manel_Marin 0:5ce3cfc57999 172 while((MCG->S & 0x0CU) != 0x0CU) { /* Wait until output of the PLL is selected */
Manel_Marin 0:5ce3cfc57999 173 }
Manel_Marin 0:5ce3cfc57999 174 #elif (CLOCK_SETUP == 2)
Manel_Marin 0:5ce3cfc57999 175 /* SIM->SCGC5: PORTA=1 */
Manel_Marin 0:5ce3cfc57999 176 SIM->SCGC5 |= (uint32_t)0x0200UL; /* Enable clock gate for ports to enable pin routing */
Manel_Marin 0:5ce3cfc57999 177 /* SIM->CLKDIV1: OUTDIV1=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,OUTDIV4=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0 */
Manel_Marin 0:5ce3cfc57999 178 SIM->CLKDIV1 = (uint32_t)0x00000000UL; /* Update system prescalers */
Manel_Marin 0:5ce3cfc57999 179 /* PORTA->PCR18: ISF=0,MUX=0 */
Manel_Marin 0:5ce3cfc57999 180 PORTA->PCR[18] &= (uint32_t)~0x01000700UL;
Manel_Marin 0:5ce3cfc57999 181 /* PORTA->PCR19: ISF=0,MUX=0 */
Manel_Marin 0:5ce3cfc57999 182 PORTA->PCR[19] &= (uint32_t)~0x01000700UL;
Manel_Marin 0:5ce3cfc57999 183 /* Switch to FBE Mode */
Manel_Marin 0:5ce3cfc57999 184 /* OSC0->CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=1,SC4P=0,SC8P=0,SC16P=1 */
Manel_Marin 0:5ce3cfc57999 185 OSC0->CR = (uint8_t)0x89U;
Manel_Marin 0:5ce3cfc57999 186 /* MCG->C2: LOCRE0=0,??=0,RANGE0=2,HGO0=0,EREFS0=1,LP=0,IRCS=0 */
Manel_Marin 0:5ce3cfc57999 187 MCG->C2 = (uint8_t)0x24U;
Manel_Marin 0:5ce3cfc57999 188 /* MCG->C1: CLKS=2,FRDIV=3,IREFS=0,IRCLKEN=1,IREFSTEN=0 */
Manel_Marin 0:5ce3cfc57999 189 MCG->C1 = (uint8_t)0x9AU;
Manel_Marin 0:5ce3cfc57999 190 /* MCG->C4: DMX32=0,DRST_DRS=0 */
Manel_Marin 0:5ce3cfc57999 191 MCG->C4 &= (uint8_t)~(uint8_t)0xE0U;
Manel_Marin 0:5ce3cfc57999 192 /* MCG->C5: ??=0,PLLCLKEN0=0,PLLSTEN0=0,PRDIV0=0 */
Manel_Marin 0:5ce3cfc57999 193 MCG->C5 = (uint8_t)0x00U;
Manel_Marin 0:5ce3cfc57999 194 /* MCG->C6: LOLIE0=0,PLLS=0,CME0=0,VDIV0=0 */
Manel_Marin 0:5ce3cfc57999 195 MCG->C6 = (uint8_t)0x00U;
Manel_Marin 0:5ce3cfc57999 196 while((MCG->S & MCG_S_IREFST_MASK) != 0x00U) { /* Check that the source of the FLL reference clock is the external reference clock. */
Manel_Marin 0:5ce3cfc57999 197 }
Manel_Marin 0:5ce3cfc57999 198 while((MCG->S & 0x0CU) != 0x08U) { /* Wait until external reference clock is selected as MCG output */
Manel_Marin 0:5ce3cfc57999 199 }
Manel_Marin 0:5ce3cfc57999 200 /* Switch to BLPE Mode */
Manel_Marin 0:5ce3cfc57999 201 /* MCG->C2: LOCRE0=0,??=0,RANGE0=2,HGO0=0,EREFS0=1,LP=1,IRCS=0 */
Manel_Marin 0:5ce3cfc57999 202 MCG->C2 = (uint8_t)0x26U;
Manel_Marin 0:5ce3cfc57999 203 while((MCG->S & 0x0CU) != 0x08U) { /* Wait until external reference clock is selected as MCG output */
Manel_Marin 0:5ce3cfc57999 204 }
Manel_Marin 0:5ce3cfc57999 205 #elif (CLOCK_SETUP == 3)
Manel_Marin 0:5ce3cfc57999 206 /* SIM->SCGC5: PORTA=1 */
Manel_Marin 0:5ce3cfc57999 207 SIM->SCGC5 |= SIM_SCGC5_PORTA_MASK; /* Enable clock gate for ports to enable pin routing */
Manel_Marin 0:5ce3cfc57999 208 /* SIM->CLKDIV1: OUTDIV1=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,OUTDIV4=1,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0 */
Manel_Marin 0:5ce3cfc57999 209 SIM->CLKDIV1 = (SIM_CLKDIV1_OUTDIV1(0x00) | SIM_CLKDIV1_OUTDIV4(0x01)); /* Update system prescalers */
Manel_Marin 0:5ce3cfc57999 210 /* PORTA->PCR[3]: ISF=0,MUX=0 */
Manel_Marin 0:5ce3cfc57999 211 PORTA->PCR[3] &= (uint32_t)~(uint32_t)((PORT_PCR_ISF_MASK | PORT_PCR_MUX(0x07)));
Manel_Marin 0:5ce3cfc57999 212 /* PORTA->PCR[4]: ISF=0,MUX=0 */
Manel_Marin 0:5ce3cfc57999 213 PORTA->PCR[4] &= (uint32_t)~(uint32_t)((PORT_PCR_ISF_MASK | PORT_PCR_MUX(0x07)));
Manel_Marin 0:5ce3cfc57999 214 /* Switch to FEE Mode */
Manel_Marin 0:5ce3cfc57999 215 /* MCG->C2: LOCRE0=0,??=0,RANGE0=0,HGO0=0,EREFS0=1,LP=0,IRCS=0 */
Manel_Marin 0:5ce3cfc57999 216 MCG->C2 = (MCG_C2_RANGE0(0x00) | MCG_C2_EREFS0_MASK);
Manel_Marin 0:5ce3cfc57999 217 /* OSC0->CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */
Manel_Marin 0:5ce3cfc57999 218 OSC0->CR = OSC_CR_ERCLKEN_MASK | OSC_CR_SC16P_MASK | OSC_CR_SC4P_MASK | OSC_CR_SC2P_MASK;
Manel_Marin 0:5ce3cfc57999 219 /* MCG->C1: CLKS=0,FRDIV=0,IREFS=0,IRCLKEN=1,IREFSTEN=0 */
Manel_Marin 0:5ce3cfc57999 220 MCG->C1 = (MCG_C1_CLKS(0x00) | MCG_C1_FRDIV(0x00) | MCG_C1_IRCLKEN_MASK);
Manel_Marin 0:5ce3cfc57999 221 /* MCG->C4: DMX32=1,DRST_DRS=1 */
Manel_Marin 0:5ce3cfc57999 222 MCG->C4 = (uint8_t)((MCG->C4 & (uint8_t)~(uint8_t)(
Manel_Marin 0:5ce3cfc57999 223 MCG_C4_DRST_DRS(0x02)
Manel_Marin 0:5ce3cfc57999 224 )) | (uint8_t)(
Manel_Marin 0:5ce3cfc57999 225 MCG_C4_DMX32_MASK |
Manel_Marin 0:5ce3cfc57999 226 MCG_C4_DRST_DRS(0x01)
Manel_Marin 0:5ce3cfc57999 227 ));
Manel_Marin 0:5ce3cfc57999 228 while((MCG->S & MCG_S_IREFST_MASK) != 0x00U) { /* Check that the source of the FLL reference clock is the external reference clock. */
Manel_Marin 0:5ce3cfc57999 229 }
Manel_Marin 0:5ce3cfc57999 230 while((MCG->S & 0x0CU) != 0x00U) { /* Wait until output of the FLL is selected */
Manel_Marin 0:5ce3cfc57999 231 }
Manel_Marin 0:5ce3cfc57999 232 #endif /* (CLOCK_SETUP == 3) */
Manel_Marin 0:5ce3cfc57999 233 }