tacocatgirl/kl05z-gcc
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Aria Nolan 2024-01-27 16:11:44 -05:00
parent 670d6fbe0d
commit 2059a71d5d
1 changed files with 17 additions and 17 deletions
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34
sysinit.c
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@ -5,28 +5,28 @@
// comments here are pretty poor since I barely understand what's going on // comments here are pretty poor since I barely understand what's going on
void SystemInit() void SystemInit()
{ {
__asm("cpsid i"); __asm("cpsid i");
SIM_COPC = 0; // disable COP watchdog timer SIM_COPC = 0; // disable COP watchdog timer
/***** set 48-MHz clock, 24-MHz bus clock ******/ /***** set 48-MHz clock, 24-MHz bus clock ******/
SIM_SCGC5 |= 0x00000200; // port A mask SIM_SCGC5 |= 0x00000200; // port A mask
PORTA_PCR3 = PORT_PCR_ISF_MASK; PORTA_PCR3 = PORT_PCR_ISF_MASK;
PORTA_PCR4 = PORT_PCR_ISF_MASK; PORTA_PCR4 = PORT_PCR_ISF_MASK;
SIM_CLKDIV1 = 1 << SIM_CLKDIV1_OUTDIV4_SHIFT; // changes clock divider SIM_CLKDIV1 = 1 << SIM_CLKDIV1_OUTDIV4_SHIFT; // changes clock divider
MCG_C2 = MCG_C2_EREFS0_MASK; // osc settings MCG_C2 = MCG_C2_EREFS0_MASK; // osc settings
OSC0_CR = OSC_CR_ERCLKEN_MASK; // external ref clock OSC0_CR = OSC_CR_ERCLKEN_MASK; // external ref clock
MCG_C1 = MCG_C1_IRCLKEN_MASK; MCG_C1 = MCG_C1_IRCLKEN_MASK;
while (!(MCG_S & MCG_S_OSCINIT0_MASK)); // wait for osc to become stable while (!(MCG_S & MCG_S_OSCINIT0_MASK)); // wait for osc to become stable
while (MCG_S & MCG_S_IREFST_MASK); // wait for FLL and external clock to match while (MCG_S & MCG_S_IREFST_MASK); // wait for FLL and external clock to match
// preserve FCTRIM and SCFTRIM // preserve FCTRIM and SCFTRIM
MCG_C4 = ((MCG_C4 & -MCG_C4_DRST_DRS_MASK) | MCG_C4_DC0_25PMAX_MID); MCG_C4 = ((MCG_C4 & -MCG_C4_DRST_DRS_MASK) | MCG_C4_DC0_25PMAX_MID);
// wait for output of FLL to be selected // wait for output of FLL to be selected
while (MCG_S & MCG_S_CLKST_MASK); while (MCG_S & MCG_S_CLKST_MASK);
/****************************/ /****************************/
} }