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cpu/sam0_common: RTC: avoid negative month after POR

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This commit is contained in:
Benjamin Valentin 2024-03-07 11:30:23 +01:00
parent 1bf643dd5a
commit 8c4d0c53f2
1 changed files with 7 additions and 0 deletions
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7
cpu/sam0_common/periph/rtc_rtt.c
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@ -330,6 +330,13 @@ static void _rtc_init(void)
RTC->MODE2.CTRLA.reg = RTC_MODE2_CTRLA_PRESCALER_DIV1024 /* CLK_RTC_CNT = 1KHz / 1024 -> 1Hz */
| RTC_MODE2_CTRLA_CLOCKSYNC /* Clock Read Synchronization Enable */
| RTC_MODE2_CTRLA_MODE_CLOCK;
/* RTC is all 0 after POR, avoid reading invalid date right after boot */
if (RTC->MODE2.CLOCK.reg == 0) {
RTC->MODE2.CLOCK.reg = RTC_MODE2_CLOCK_MONTH(1)
| RTC_MODE2_CLOCK_DAY(1);
}
#ifdef RTC_MODE2_CTRLB_GP2EN
/* RTC driver does not use COMP[1] or ALARM[1] */
/* Use second set of Compare registers as general purpose register */