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Merge pull request #14678 from dylad/cpu/saml1x/rtt-init-fix

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cpu/saml1x: fix RTT issue in init process
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benpicco 2020-09-09 22:47:51 +02:00 committed by GitHub
commit be3667bfdd
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1 changed files with 12 additions and 0 deletions
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12
cpu/saml1x/cpu.c
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@ -135,9 +135,21 @@ void cpu_init(void)
#endif
#ifdef MODULE_PERIPH_GPIO
| MCLK_APBAMASK_PORT
#endif
#ifdef MODULE_PERIPH_RTC_RTT
| MCLK_APBAMASK_RTC
#endif
;
/* Disable the RTC module to prevent synchronization issues during CPU init
if the RTC was running from a previous boot (e.g wakeup from backup)
as the module will be re-init during the boot process */
if (RTC->MODE2.CTRLA.bit.ENABLE && IS_ACTIVE(MODULE_PERIPH_RTC_RTT)) {
while (RTC->MODE2.SYNCBUSY.reg) {}
RTC->MODE2.CTRLA.bit.ENABLE = 0;
while (RTC->MODE2.SYNCBUSY.reg) {}
}
/* Software reset the GCLK module to ensure it is re-initialized correctly */
GCLK->CTRLA.reg = GCLK_CTRLA_SWRST;
while (GCLK->CTRLA.reg & GCLK_CTRLA_SWRST) {}