Diff: KL25Z_SystemInit.c

Revision:

3:c6c88a1a58a8

diff -r de96c8c234b6 -r c6c88a1a58a8 KL25Z_SystemInit.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/KL25Z_SystemInit.c	Fri Mar 09 15:19:12 2018 +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 */
+  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,OUTDIV4=1 */
+  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,EREFSTEN=0,SC2P=1,SC4P=0,SC8P=0,SC16P=1 */
+  OSC0->CR = (uint8_t)0x89U;
+  /* MCG->C2: LOCRE0=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: 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,OUTDIV4=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,EREFSTEN=0,SC2P=1,SC4P=0,SC8P=0,SC16P=1 */
+  OSC0->CR = (uint8_t)0x89U;
+  /* MCG->C2: LOCRE0=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: 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,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, OUTDIV4=1 */
+  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,RANGE0=0,HGO0=0,EREFS0=1,LP=0,IRCS=0 */
+  MCG->C2 = (MCG_C2_RANGE0(0x00) | MCG_C2_EREFS0_MASK);
+  /* OSC0->CR: ERCLKEN=1,EREFSTEN=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) */
+}