Function osGetTime

libctru/source/os.c:67–89

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//---------------------------------------------------------------------------------
u64 osGetTime(void) {
//---------------------------------------------------------------------------------
	// Read the latest time reference point published by PTM
	osTimeRef_s tr = osGetTimeRef();

	// Calculate the time elapsed since the reference point using the system clock
	s64 elapsed_tick = svcGetSystemTick() - tr.value_tick;
	s64 elapsed_ms = elapsed_tick * 1000 / tr.sysclock_hz;

	// Apply the drift adjustment if present:
	// Every time PTM publishes a new reference point it measures by how long the
	// system clock has drifted with respect to the RTC. It also recalculates the
	// system clock frequency using RTC data in order to minimize future drift.
	// The idea behind the following logic is to reapply the inaccuracy to the
	// calculated timestamp, but gradually reducing it to zero over the course of
	// an hour. This ensures the monotonic growth of the returned time value.
	const s64 hour_in_ms = 60*60*1000; // milliseconds in an hour
	if (tr.drift_ms != 0 && elapsed_ms < hour_in_ms)
		elapsed_ms += tr.drift_ms * (hour_in_ms - elapsed_ms) / hour_in_ms;

	// Return the final timestamp
	return tr.value_ms + elapsed_ms;
}

//---------------------------------------------------------------------------------
double osTickCounterRead(const TickCounter* cnt) {