Library to control the KL25z Clock Module.
hello
kl25z_clock.cpp
- Committer:
- AlfredoER
- Date:
- 2014-08-14
- Revision:
- 0:218e465e76b6
- Child:
- 1:1097467b4352
File content as of revision 0:218e465e76b6:
#include <stdint.h> #include "MKL25Z4.h" #include "kl25z_clock.h" void switchFEItoPEE( void ) { /* 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 */ } /* Run this to get the new system frequency */ SystemCoreClockUpdate(); } void switchPEEtoBLPI( void ) { MCG->C1 = (uint8_t)0x90U; /* Run this to get the new system frequency */ SystemCoreClockUpdate(); } void switchBLPItoPEE( void ) { }