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/*
** ###################################################################
** Processors: MKL05Z32FK4
** MKL05Z32LC4
** MKL05Z32VLF4
**
** Compilers: ARM Compiler
** Freescale C/C++ for Embedded ARM
** GNU C Compiler
** IAR ANSI C/C++ Compiler for ARM
**
** Reference manual: KL05P48M48SF1RM, Rev.3, Sep 2012
** Version: rev. 1.6, 2013-04-11
**
** 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: 2013 Freescale, Inc. All Rights Reserved.
**
** http: www.freescale.com
** mail: support@freescale.com
**
** Revisions:
** - rev. 1.0 (2012-06-08)
** Initial version.
** - rev. 1.1 (2012-06-21)
** Update according to reference manual rev. 1.
** - rev. 1.2 (2012-08-01)
** Device type UARTLP changed to UART0.
** Missing PORTB_IRQn interrupt number definition added.
** - rev. 1.3 (2012-10-04)
** Update according to reference manual rev. 3.
** - rev. 1.4 (2012-11-22)
** MCG module - bit LOLS in MCG_S register renamed to LOLS0.
** NV registers - bit EZPORT_DIS in NV_FOPT register removed.
** - rev. 1.5 (2013-04-05)
** Changed start of doxygen comment.
** - rev. 1.6 (2013-04-11)
** SystemInit methods updated with predefined initialization sequence.
**
** ###################################################################
*/
/*!
* @file MKL05Z4
* @version 1.6
* @date 2013-04-11
* @brief Device specific configuration file for MKL05Z4 (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 "MKL05Z4.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 = 20.97MHz
1 ... 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
2 ... Multipurpose Clock Generator (MCG) in FLL Bypassed Low Power Internal (BLPI) mode
Core clock/Bus clock derived directly from an fast internal 4MHz clock with no multiplication
Core clock = 4MHz, BusClock = 4MHz
*/
/*----------------------------------------------------------------------------
Define clock source values
*----------------------------------------------------------------------------*/
#if (CLOCK_SETUP == 0)
#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 41943040u /* Default System clock value */
#elif (CLOCK_SETUP == 1)
#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 */
#elif (CLOCK_SETUP == 2)
#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 4000000u /* 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 */
/* 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=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 */
/* Switch to FEI Mode */
/* MCG->C1: CLKS=0,FRDIV=0,IREFS=1,IRCLKEN=1,IREFSTEN=0 */
MCG->C1 = MCG_C1_CLKS(0x00) |
MCG_C1_FRDIV(0x00) |
MCG_C1_IREFS_MASK |
MCG_C1_IRCLKEN_MASK;
/* MCG->C2: LOCRE0=0,??=0,RANGE0=0,HGO0=0,EREFS0=0,LP=0,IRCS=0 */
MCG->C2 = MCG_C2_RANGE0(0x00);
/* MCG_C4: DMX32=0,DRST_DRS=1 */
MCG->C4 = (uint8_t)((MCG->C4 & (uint8_t)~(uint8_t)(
MCG_C4_DMX32_MASK |
MCG_C4_DRST_DRS(0x02)
)) | (uint8_t)(
MCG_C4_DRST_DRS(0x01)
));
/* OSC0->CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */
OSC0->CR = OSC_CR_ERCLKEN_MASK;
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 |= 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=1,SC8P=1,SC16P=0 */
OSC0->CR = OSC_CR_ERCLKEN_MASK | OSC_CR_SC8P_MASK | OSC_CR_SC4P_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 */
}
#elif (CLOCK_SETUP == 2)
/* 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 = (SIM_CLKDIV1_OUTDIV1(0x00) | SIM_CLKDIV1_OUTDIV4(0x00)); /* Update system prescalers */
/* MCG->SC: FCRDIV=0 */
MCG->SC &= (uint8_t)~(uint8_t)(MCG_SC_FCRDIV(0x07));
/* Switch to FBI Mode */
/* MCG->C1: CLKS=1,FRDIV=0,IREFS=1,IRCLKEN=1,IREFSTEN=0 */
MCG->C1 = MCG_C1_CLKS(0x01) |
MCG_C1_FRDIV(0x00) |
MCG_C1_IREFS_MASK |
MCG_C1_IRCLKEN_MASK;
/* MCG->C2: LOCRE0=0,??=0,RANGE0=0,HGO0=0,EREFS0=0,LP=0,IRCS=1 */
MCG->C2 = (MCG_C2_RANGE0(0x00) | MCG_C2_IRCS_MASK);
/* MCG->C4: DMX32=0,DRST_DRS=0 */
MCG->C4 &= (uint8_t)~(uint8_t)((MCG_C4_DMX32_MASK | MCG_C4_DRST_DRS(0x03)));
/* OSC0->CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */
OSC0->CR = OSC_CR_ERCLKEN_MASK;
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) != 0x04U) { /* Wait until internal reference clock is selected as MCG output */
}
/* Switch to BLPI Mode */
/* MCG->C2: LOCRE0=0,??=0,RANGE0=0,HGO0=0,EREFS0=0,LP=1,IRCS=1 */
MCG->C2 = (MCG_C2_RANGE0(0x00) | MCG_C2_LP_MASK | MCG_C2_IRCS_MASK);
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 & MCG_S_IRCST_MASK) == 0x00U) { /* Check that the fast external reference clock is selected. */
}
#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 is selected */
if ((MCG->C1 & MCG_C1_IREFS_MASK) == 0x0u) {
/* External reference clock is selected */
MCGOUTClock = CPU_XTAL_CLK_HZ; /* System oscillator drives MCG clock */
Divider = (uint8_t)(1u << ((MCG->C1 & MCG_C1_FRDIV_MASK) >> MCG_C1_FRDIV_SHIFT));
MCGOUTClock = (MCGOUTClock / Divider); /* Calculate the divided FLL reference clock */
} 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 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 */
MCGOUTClock = CPU_XTAL_CLK_HZ; /* System oscillator drives MCG clock */
} 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)));
}
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