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drivers: rtc: stm32: fix wrong nanosecond value

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SSR register does not contain direct nanosecond value. This adds the
necessary conversion.

Signed-off-by: Johan Lafon <johan.lafon@syslinbit.com>
This commit is contained in:
Johan Lafon 2023-09-05 18:17:07 +02:00 • committed by Fabio Baltieri
commit 29fa718941
1 changed files with 10 additions and 6 deletions
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16
drivers/rtc/rtc_ll_stm32.c
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@ -156,13 +156,15 @@ static int rtc_stm32_set_time(const struct device *dev, const struct rtc_time *t
static int rtc_stm32_get_time(const struct device *dev, struct rtc_time *timeptr)
{
ARG_UNUSED(dev);
const struct rtc_stm32_config *cfg = dev->config;
uint32_t sync_prescaler = cfg->ll_rtc_config.SynchPrescaler;
uint32_t rtc_date, rtc_time;
uint32_t rtc_date, rtc_time, rtc_subsecond;
/* Read time and date registers */
rtc_time = LL_RTC_TIME_Get(RTC);
rtc_date = LL_RTC_DATE_Get(RTC);
/* Read subsecond, time and date registers */
rtc_subsecond = LL_RTC_TIME_GetSubSecond(RTC);
rtc_time = LL_RTC_TIME_Get(RTC);
rtc_date = LL_RTC_DATE_Get(RTC);
timeptr->tm_year = TM_TO_RTC_OFFSET + __LL_RTC_CONVERT_BCD2BIN(__LL_RTC_GET_YEAR(rtc_date));
/* tm_mon allowed values are 0-11 */
@ -174,7 +176,9 @@ static int rtc_stm32_get_time(const struct device *dev, struct rtc_time *timeptr
timeptr->tm_min = __LL_RTC_CONVERT_BCD2BIN(__LL_RTC_GET_MINUTE(rtc_time));
timeptr->tm_sec = __LL_RTC_CONVERT_BCD2BIN(__LL_RTC_GET_SECOND(rtc_time));
timeptr->tm_nsec = LL_RTC_TIME_GetSubSecond(RTC);
uint64_t temp = ((uint64_t)(sync_prescaler - rtc_subsecond)) * 1000000000L;
timeptr->tm_nsec = DIV_ROUND_CLOSEST(temp, sync_prescaler + 1);
return 0;
}