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drivers: rtc: stm32: check if year is supported by RTC

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RTC does not support year before 2000 while tm/rtc_time structure
reference year is 1900

Signed-off-by: Johan Lafon <johan.lafon@syslinbit.com>
This commit is contained in:
Johan Lafon 2023-09-11 12:09:52 +02:00 • committed by Fabio Baltieri
commit f0b3e4e850
1 changed files with 13 additions and 4 deletions
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17
drivers/rtc/rtc_ll_stm32.c
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@ -27,10 +27,12 @@
LOG_MODULE_REGISTER(rtc_stm32, CONFIG_RTC_LOG_LEVEL);
/* Convert calendar start time */
/* RTC start time: 1st, Jan, 2000 */
/* struct tm start: 1st, Jan, 1900 */
#define TM_TO_RTC_OFFSET 100
#define RTC_YEAR_REF 2000
/* struct tm start time: 1st, Jan, 1900 */
#define TM_YEAR_REF 1900
/* conversion offset between RTC and tm structure */
#define TM_TO_RTC_OFFSET (RTC_YEAR_REF - TM_YEAR_REF)
/* Convert part per billion calibration value to a number of clock pulses added or removed each
* 2^20 clock cycles so it is suitable for the CALR register fields
@ -129,6 +131,13 @@ static const struct rtc_stm32_config rtc_config = {
static int rtc_stm32_set_time(const struct device *dev, const struct rtc_time *timeptr)
{
uint32_t real_year = timeptr->tm_year + TM_YEAR_REF;
if (real_year < RTC_YEAR_REF) {
/* RTC does not support years before 2000 */
return -EINVAL;
}
LOG_INF("Setting clock");
LL_RTC_DisableWriteProtection(RTC);
@ -137,7 +146,7 @@ static int rtc_stm32_set_time(const struct device *dev, const struct rtc_time *t
while (!LL_RTC_IsActiveFlag_INIT(RTC)) {
};
LL_RTC_DATE_SetYear(RTC, __LL_RTC_CONVERT_BIN2BCD(timeptr->tm_year - TM_TO_RTC_OFFSET));
LL_RTC_DATE_SetYear(RTC, __LL_RTC_CONVERT_BIN2BCD(real_year - RTC_YEAR_REF));
LL_RTC_DATE_SetMonth(RTC, __LL_RTC_CONVERT_BIN2BCD(timeptr->tm_mon + 1));
LL_RTC_DATE_SetDay(RTC, __LL_RTC_CONVERT_BIN2BCD(timeptr->tm_mday));