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?
User | Revision | Line number | New 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 | } |