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Align the top of the second with the 1Hz periodic interrupt

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Alessandro Genova
2025-08-03 01:13:19 -04:00
parent e2d13e076e
commit 7acc9cc414
3 changed files with 68 additions and 32 deletions
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watch-library/simulator/watch/watch_rtc.c
+5 -4
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@@ -31,6 +31,7 @@
#include <emscripten/html5.h>
static const uint32_t RTC_CNT_HZ = 128;
static const uint32_t RTC_CNT_SUBSECOND_MASK = RTC_CNT_HZ - 1;
static const uint32_t RTC_CNT_DIV = 7;
static const uint32_t RTC_CNT_TICKS_PER_MINUTE = RTC_CNT_HZ * 60;
static const uint32_t RTC_CNT_TICKS_PER_HOUR = RTC_CNT_TICKS_PER_MINUTE * 60;
@@ -98,15 +99,15 @@ rtc_date_time_t watch_rtc_get_date_time(void) {
}
void watch_rtc_set_unix_time(unix_timestamp_t unix_time) {
// time_backup + counter / RTC_CNT_HZ = unix_time
// unix_time = time_backup + counter / RTC_CNT_HZ - 0.5
rtc_counter_t counter = watch_rtc_get_counter();
reference_timestamp = unix_time - (counter >> RTC_CNT_DIV);
reference_timestamp = unix_time - (counter >> RTC_CNT_DIV) - ((counter & RTC_CNT_SUBSECOND_MASK) >> (RTC_CNT_DIV - 1)) + 1;
}
unix_timestamp_t watch_rtc_get_unix_time(void) {
// time_backup + counter / RTC_CNT_HZ = unix_time
// unix_time = time_backup + counter / RTC_CNT_HZ - 0.5
rtc_counter_t counter = watch_rtc_get_counter();
return reference_timestamp + (counter >> RTC_CNT_DIV);
return reference_timestamp + (counter >> RTC_CNT_DIV) + ((counter & RTC_CNT_SUBSECOND_MASK) >> (RTC_CNT_DIV - 1)) - 1;
}
rtc_counter_t watch_rtc_get_counter(void) {