Alfredo Espinoza Rhoton / KL25Z_ClockControl

Library to control the KL25z Clock Module.

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kl25z_clock.cpp@0:218e465e76b6, 2014-08-14 (annotated)

Committer:
AlfredoER
Date:
Thu Aug 14 23:34:18 2014 +0000
Revision:
0:218e465e76b6
Child:
1:1097467b4352
-First draft of library.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AlfredoER 0:218e465e76b6 1 #include <stdint.h>
AlfredoER 0:218e465e76b6 2 #include "MKL25Z4.h"
AlfredoER 0:218e465e76b6 3
AlfredoER 0:218e465e76b6 4 #include "kl25z_clock.h"
AlfredoER 0:218e465e76b6 5
AlfredoER 0:218e465e76b6 6 void switchFEItoPEE( void )
AlfredoER 0:218e465e76b6 7 {
AlfredoER 0:218e465e76b6 8 /* SIM->SCGC5: PORTA=1 */
AlfredoER 0:218e465e76b6 9 SIM->SCGC5 |= (uint32_t)0x0200UL; /* Enable clock gate for ports to enable pin routing */
AlfredoER 0:218e465e76b6 10 /* 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 */
AlfredoER 0:218e465e76b6 11 SIM->CLKDIV1 = (uint32_t)0x10010000UL; /* Update system prescalers */
AlfredoER 0:218e465e76b6 12 /* PORTA->PCR18: ISF=0,MUX=0 */
AlfredoER 0:218e465e76b6 13 PORTA->PCR[18] &= (uint32_t)~0x01000700UL;
AlfredoER 0:218e465e76b6 14 /* PORTA->PCR19: ISF=0,MUX=0 */
AlfredoER 0:218e465e76b6 15 PORTA->PCR[19] &= (uint32_t)~0x01000700UL;
AlfredoER 0:218e465e76b6 16 /* Switch to FBE Mode */
AlfredoER 0:218e465e76b6 17 /* OSC0->CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=1,SC4P=0,SC8P=0,SC16P=1 */
AlfredoER 0:218e465e76b6 18 OSC0->CR = (uint8_t)0x89U;
AlfredoER 0:218e465e76b6 19 /* MCG->C2: LOCRE0=0,??=0,RANGE0=2,HGO0=0,EREFS0=1,LP=0,IRCS=0 */
AlfredoER 0:218e465e76b6 20 MCG->C2 = (uint8_t)0x24U;
AlfredoER 0:218e465e76b6 21 /* MCG->C1: CLKS=2,FRDIV=3,IREFS=0,IRCLKEN=1,IREFSTEN=0 */
AlfredoER 0:218e465e76b6 22 MCG->C1 = (uint8_t)0x9AU;
AlfredoER 0:218e465e76b6 23 /* MCG->C4: DMX32=0,DRST_DRS=0 */
AlfredoER 0:218e465e76b6 24 MCG->C4 &= (uint8_t)~(uint8_t)0xE0U;
AlfredoER 0:218e465e76b6 25 /* MCG->C5: ??=0,PLLCLKEN0=0,PLLSTEN0=0,PRDIV0=1 */
AlfredoER 0:218e465e76b6 26 MCG->C5 = (uint8_t)0x01U;
AlfredoER 0:218e465e76b6 27 /* MCG->C6: LOLIE0=0,PLLS=0,CME0=0,VDIV0=0 */
AlfredoER 0:218e465e76b6 28 MCG->C6 = (uint8_t)0x00U;
AlfredoER 0:218e465e76b6 29 while((MCG->S & MCG_S_IREFST_MASK) != 0x00U) { /* Check that the source of the FLL reference clock is the external reference clock. */
AlfredoER 0:218e465e76b6 30 }
AlfredoER 0:218e465e76b6 31 while((MCG->S & 0x0CU) != 0x08U) { /* Wait until external reference clock is selected as MCG output */
AlfredoER 0:218e465e76b6 32 }
AlfredoER 0:218e465e76b6 33 /* Switch to PBE Mode */
AlfredoER 0:218e465e76b6 34 /* MCG->C6: LOLIE0=0,PLLS=1,CME0=0,VDIV0=0 */
AlfredoER 0:218e465e76b6 35 MCG->C6 = (uint8_t)0x40U;
AlfredoER 0:218e465e76b6 36 while((MCG->S & 0x0CU) != 0x08U) { /* Wait until external reference clock is selected as MCG output */
AlfredoER 0:218e465e76b6 37 }
AlfredoER 0:218e465e76b6 38 while((MCG->S & MCG_S_LOCK0_MASK) == 0x00U) { /* Wait until locked */
AlfredoER 0:218e465e76b6 39 }
AlfredoER 0:218e465e76b6 40 /* Switch to PEE Mode */
AlfredoER 0:218e465e76b6 41 /* MCG->C1: CLKS=0,FRDIV=3,IREFS=0,IRCLKEN=1,IREFSTEN=0 */
AlfredoER 0:218e465e76b6 42 MCG->C1 = (uint8_t)0x1AU;
AlfredoER 0:218e465e76b6 43 while((MCG->S & 0x0CU) != 0x0CU) { /* Wait until output of the PLL is selected */
AlfredoER 0:218e465e76b6 44 }
AlfredoER 0:218e465e76b6 45
AlfredoER 0:218e465e76b6 46 /* Run this to get the new system frequency */
AlfredoER 0:218e465e76b6 47 SystemCoreClockUpdate();
AlfredoER 0:218e465e76b6 48 }
AlfredoER 0:218e465e76b6 49
AlfredoER 0:218e465e76b6 50 void switchPEEtoBLPI( void )
AlfredoER 0:218e465e76b6 51 {
AlfredoER 0:218e465e76b6 52 MCG->C1 = (uint8_t)0x90U;
AlfredoER 0:218e465e76b6 53
AlfredoER 0:218e465e76b6 54 /* Run this to get the new system frequency */
AlfredoER 0:218e465e76b6 55 SystemCoreClockUpdate();
AlfredoER 0:218e465e76b6 56 }
AlfredoER 0:218e465e76b6 57
AlfredoER 0:218e465e76b6 58 void switchBLPItoPEE( void )
AlfredoER 0:218e465e76b6 59 {
AlfredoER 0:218e465e76b6 60
AlfredoER 0:218e465e76b6 61 }