diff options
| -rw-r--r-- | ports/atmel-samd/common-hal/rtc/RTC.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/ports/atmel-samd/common-hal/rtc/RTC.c b/ports/atmel-samd/common-hal/rtc/RTC.c index d63e81305..680a88deb 100644 --- a/ports/atmel-samd/common-hal/rtc/RTC.c +++ b/ports/atmel-samd/common-hal/rtc/RTC.c @@ -64,6 +64,12 @@ void common_hal_rtc_get_time(timeutils_struct_time_t *tm) { } void common_hal_rtc_set_time(timeutils_struct_time_t *tm) { + // Reset prescaler to increase initial precision. Otherwise we can be up to 1 second off already. + uint32_t freqcorr = hri_rtcmode0_read_FREQCORR_reg(calendar.device.hw); + calendar_deinit(&calendar); + rtc_init(); + hri_rtcmode0_write_FREQCORR_reg(calendar.device.hw, freqcorr); + struct calendar_date date = { .year = tm->tm_year, .month = tm->tm_mon, |