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counter: stm32 rtc: improve reading registers

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Synchronize reading two separate registers. In some edge cases the read
registers could point different dates.

Signed-off-by: Dawid Niedzwiecki <dawidn@google.com>
This commit is contained in:
Dawid Niedzwiecki 2023-08-16 10:12:37 +02:00 • committed by Carles Cufí
commit 16370a259a
1 changed files with 10 additions and 3 deletions
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13
drivers/counter/counter_ll_stm32_rtc.c
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@ -192,10 +192,17 @@ static uint32_t rtc_stm32_read(const struct device *dev)
#endif
ARG_UNUSED(dev);
/* Read time and date registers */
rtc_time = LL_RTC_TIME_Get(RTC);
/* Read time and date registers. Make sure value of the previous register
* hasn't been changed while reading the next one.
*/
#if !defined(COUNTER_NO_DATE)
rtc_date = LL_RTC_DATE_Get(RTC);
do {
rtc_date = LL_RTC_DATE_Get(RTC);
rtc_time = LL_RTC_TIME_Get(RTC);
} while (rtc_date != LL_RTC_DATE_Get(RTC));
#else
rtc_time = LL_RTC_TIME_Get(RTC);
#endif
#if !defined(COUNTER_NO_DATE)