Jiajun Zhang
LAB 6 PART 2
Fork of
Watchdog_sample_nocoverage
by 
William Marsh
Diff: KL25Z_SystemInit.c
- Revision:
- 0:5ce3cfc57999
- Child:
- 1:159a09ac60ba
diff -r 000000000000 -r 5ce3cfc57999 KL25Z_SystemInit.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/KL25Z_SystemInit.c Sat Nov 21 13:24:29 2015 +0000
@@ -0,0 +1,233 @@
+/*
+** ###################################################################
+** Processor: MKL25Z128VLK4
+** Compilers: ARM Compiler
+** Freescale C/C++ for Embedded ARM
+** GNU C Compiler
+** IAR ANSI C/C++ Compiler for ARM
+**
+** Reference manual: KL25RM, Rev.1, Jun 2012
+** Version: rev. 1.1, 2012-06-21
+**
+** 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: 2012 Freescale Semiconductor, Inc. All Rights Reserved.
+**
+** http: www.freescale.com
+** mail: support@freescale.com
+**
+** Revisions:
+** - rev. 1.0 (2012-06-13)
+** Initial version.
+** - rev. 1.1 (2012-06-21)
+** Update according to reference manual rev. 1.
+**
+** ###################################################################
+*/
+
+/**
+ * @file MKL25Z4
+ * @version 1.1
+ * @date 2012-06-21
+ * @brief Device specific configuration file for MKL25Z4 (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 "MKL25Z4.h"
+
+//MODIFICATION: We DO want watchdog, uC default after reset is enabled with timeout=1024ms (2^10*LPO=1KHz)
+//#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 = 13.98MHz
+ 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 = 24MHz
+ 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
+ 3 ... Multipurpose Clock Generator (MCG) in FLL Engaged External (FEE) mode
+ Reference clock source for MCG module is an external crystal 32.768kHz
+ Core clock = 47.97MHz, BusClock = 23.98MHz
+ This setup sets the RTC to be driven by the MCU clock directly without the need of an external source.
+ RTC register values are retained when MCU is reset although there will be a slight (mSec's)loss of time
+ accuracy durring the reset period. RTC will reset on power down.
+*/
+
+/*----------------------------------------------------------------------------
+ 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_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_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_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 */
+#elif (CLOCK_SETUP == 3)
+ #define CPU_XTAL_CLK_HZ 32768u /* Value of the external 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 47972352u /* Default System clock value */
+#endif /* (CLOCK_SETUP == 3) */
+
+/* ----------------------------------------------------------------------------
+ -- Core clock
+ ---------------------------------------------------------------------------- */
+
+//MODIFICATION: That vartiable already exists
+// uint32_t SystemCoreClock = DEFAULT_SYSTEM_CLOCK;
+
+/* ----------------------------------------------------------------------------
+ -- SystemInit()
+ ---------------------------------------------------------------------------- */
+
+void $Sub$$SystemInit (void) {
+
+ //MODIFICATION:
+ // That variable already exists, we set it here
+ SystemCoreClock = DEFAULT_SYSTEM_CLOCK;
+ // We want visual indication of boot time with red LED on
+ //TODO
+
+#if (DISABLE_WDOG)
+ /* Disable the WDOG module */
+ /* SIM_COPC: COPT=0,COPCLKS=0,COPW=0 */
+ SIM->COPC = (uint32_t)0x00u;
+#endif /* (DISABLE_WDOG) */
+#if (CLOCK_SETUP == 0)
+ /* 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 */
+ SIM->CLKDIV1 = (uint32_t)0x00020000UL; /* 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: LOCRE0=0,??=0,RANGE0=0,HGO0=0,EREFS0=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);
+ /* OSC0->CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */
+ OSC0->CR = (uint8_t)0x80U;
+ /* MCG->C5: ??=0,PLLCLKEN0=0,PLLSTEN0=0,PRDIV0=0 */
+ MCG->C5 = (uint8_t)0x00U;
+ /* MCG->C6: LOLIE0=0,PLLS=0,CME0=0,VDIV0=0 */
+ MCG->C6 = (uint8_t)0x00U;
+ while((MCG->S & MCG_S_IREFST_MASK) == 0x00U) { /* 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->SCGC5: PORTA=1 */
+ SIM->SCGC5 |= (uint32_t)0x0200UL; /* Enable clock gate for ports to enable pin routing */
+ /* 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 */
+ SIM->CLKDIV1 = (uint32_t)0x10010000UL; /* Update system prescalers */
+ /* PORTA->PCR18: ISF=0,MUX=0 */
+ PORTA->PCR[18] &= (uint32_t)~0x01000700UL;
+ /* PORTA->PCR19: ISF=0,MUX=0 */
+ PORTA->PCR[19] &= (uint32_t)~0x01000700UL;
+ /* Switch to FBE Mode */
+ /* OSC0->CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=1,SC4P=0,SC8P=0,SC16P=1 */
+ OSC0->CR = (uint8_t)0x89U;
+ /* MCG->C2: LOCRE0=0,??=0,RANGE0=2,HGO0=0,EREFS0=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,PLLCLKEN0=0,PLLSTEN0=0,PRDIV0=1 */
+ MCG->C5 = (uint8_t)0x01U;
+ /* MCG->C6: LOLIE0=0,PLLS=0,CME0=0,VDIV0=0 */
+ MCG->C6 = (uint8_t)0x00U;
+ while((MCG->S & MCG_S_IREFST_MASK) != 0x00U) { /* Check that the source of the FLL reference clock is the external reference clock. */
+ }
+ while((MCG->S & 0x0CU) != 0x08U) { /* Wait until external reference clock is selected as MCG output */
+ }
+ /* Switch to PBE Mode */
+ /* MCG->C6: LOLIE0=0,PLLS=1,CME0=0,VDIV0=0 */
+ MCG->C6 = (uint8_t)0x40U;
+ while((MCG->S & 0x0CU) != 0x08U) { /* Wait until external reference clock is selected as MCG output */
+ }
+ while((MCG->S & MCG_S_LOCK0_MASK) == 0x00U) { /* 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 */
+ }
+#elif (CLOCK_SETUP == 2)
+ /* SIM->SCGC5: PORTA=1 */
+ SIM->SCGC5 |= (uint32_t)0x0200UL; /* Enable clock gate for ports to enable pin routing */
+ /* 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 */
+ SIM->CLKDIV1 = (uint32_t)0x00000000UL; /* Update system prescalers */
+ /* PORTA->PCR18: ISF=0,MUX=0 */
+ PORTA->PCR[18] &= (uint32_t)~0x01000700UL;
+ /* PORTA->PCR19: ISF=0,MUX=0 */
+ PORTA->PCR[19] &= (uint32_t)~0x01000700UL;
+ /* Switch to FBE Mode */
+ /* OSC0->CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=1,SC4P=0,SC8P=0,SC16P=1 */
+ OSC0->CR = (uint8_t)0x89U;
+ /* MCG->C2: LOCRE0=0,??=0,RANGE0=2,HGO0=0,EREFS0=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,PLLCLKEN0=0,PLLSTEN0=0,PRDIV0=0 */
+ MCG->C5 = (uint8_t)0x00U;
+ /* MCG->C6: LOLIE0=0,PLLS=0,CME0=0,VDIV0=0 */
+ MCG->C6 = (uint8_t)0x00U;
+ while((MCG->S & MCG_S_IREFST_MASK) != 0x00U) { /* Check that the source of the FLL reference clock is the external reference clock. */
+ }
+ while((MCG->S & 0x0CU) != 0x08U) { /* Wait until external reference clock is selected as MCG output */
+ }
+ /* Switch to BLPE Mode */
+ /* MCG->C2: LOCRE0=0,??=0,RANGE0=2,HGO0=0,EREFS0=1,LP=1,IRCS=0 */
+ MCG->C2 = (uint8_t)0x26U;
+ while((MCG->S & 0x0CU) != 0x08U) { /* Wait until external reference clock is selected as MCG output */
+ }
+#elif (CLOCK_SETUP == 3)
+/* SIM->SCGC5: PORTA=1 */
+ SIM->SCGC5 |= SIM_SCGC5_PORTA_MASK; /* Enable clock gate for ports to enable pin routing */
+ /* 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 */
+ SIM->CLKDIV1 = (SIM_CLKDIV1_OUTDIV1(0x00) | SIM_CLKDIV1_OUTDIV4(0x01)); /* Update system prescalers */
+ /* PORTA->PCR[3]: ISF=0,MUX=0 */
+ PORTA->PCR[3] &= (uint32_t)~(uint32_t)((PORT_PCR_ISF_MASK | PORT_PCR_MUX(0x07)));
+ /* PORTA->PCR[4]: ISF=0,MUX=0 */
+ PORTA->PCR[4] &= (uint32_t)~(uint32_t)((PORT_PCR_ISF_MASK | PORT_PCR_MUX(0x07)));
+ /* Switch to FEE Mode */
+ /* MCG->C2: LOCRE0=0,??=0,RANGE0=0,HGO0=0,EREFS0=1,LP=0,IRCS=0 */
+ MCG->C2 = (MCG_C2_RANGE0(0x00) | MCG_C2_EREFS0_MASK);
+ /* OSC0->CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */
+ OSC0->CR = OSC_CR_ERCLKEN_MASK | OSC_CR_SC16P_MASK | OSC_CR_SC4P_MASK | OSC_CR_SC2P_MASK;
+ /* MCG->C1: CLKS=0,FRDIV=0,IREFS=0,IRCLKEN=1,IREFSTEN=0 */
+ MCG->C1 = (MCG_C1_CLKS(0x00) | MCG_C1_FRDIV(0x00) | MCG_C1_IRCLKEN_MASK);
+ /* MCG->C4: DMX32=1,DRST_DRS=1 */
+ MCG->C4 = (uint8_t)((MCG->C4 & (uint8_t)~(uint8_t)(
+ MCG_C4_DRST_DRS(0x02)
+ )) | (uint8_t)(
+ MCG_C4_DMX32_MASK |
+ MCG_C4_DRST_DRS(0x01)
+ ));
+ while((MCG->S & MCG_S_IREFST_MASK) != 0x00U) { /* Check that the source of the FLL reference clock is the external reference clock. */
+ }
+ while((MCG->S & 0x0CU) != 0x00U) { /* Wait until output of the FLL is selected */
+ }
+#endif /* (CLOCK_SETUP == 3) */
+}