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MK66F18: only enter HSRUN mode if actually necessary (> 120 MHz) 

This more closely matches the Teensy arduino startup and EEPROM code.
This commit is contained in:
Michael Stapelberg 2021-09-24 09:14:45 +02:00
parent 1127b5575e
commit c3c55769f8
1 changed files with 3 additions and 3 deletions
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6
os/hal/ports/KINETIS/MK66F18/hal_lld.c
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@ -228,13 +228,13 @@ void MK66F18_clock_init(void) {
#define MCG_C6_VDIV0 MCG_C6_VDIV0_SET #define MCG_C6_VDIV0 MCG_C6_VDIV0_SET
#if 1 /* PJRC_HSRUN */ #if 1 /* PJRC_HSRUN */
// if we need faster than the crystal, turn on the PLL // if we need faster than the crystal, turn on the PLL
#if F_CPU > 120000000
SMC->PMCTRL = SMC_PMCTRL_RUNM_SET(3); // enter HSRUN mode SMC->PMCTRL = SMC_PMCTRL_RUNM_SET(3); // enter HSRUN mode
#define SMC_PMSTAT_HSRUN ((uint8_t)0x80) #define SMC_PMSTAT_HSRUN ((uint8_t)0x80)
while (SMC->PMSTAT != SMC_PMSTAT_HSRUN) while (SMC->PMSTAT != SMC_PMSTAT_HSRUN)
; // wait for HSRUN ; // wait for HSRUN
#endif
#if F_CPU == 256000000 #if F_CPU == 256000000
//See table in 27.4.6 MCG Control 6 Register (MCG_C6) //See table in 27.4.6 MCG Control 6 Register (MCG_C6)
//16 -> Multiply factor 32. 32*8MHz =256MHz //16 -> Multiply factor 32. 32*8MHz =256MHz
MCG_C5 = MCG_C5_PRDIV0(0); MCG_C5 = MCG_C5_PRDIV0(0);