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timesync.cpp: adjust lora time calibration

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This commit is contained in:
Klaus K Wilting 2020-03-02 00:12:57 +01:00
parent 305b5e15eb
commit 36f0a6255a
1 changed files with 10 additions and 5 deletions
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15
src/timesync.cpp
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@ -117,14 +117,19 @@ void process_timesync_req(void *taskparameter) {
// average time offset over all collected diffs
time_offset_ms /= TIME_SYNC_SAMPLES;
// --------- do we need this? ---------
// calculate time offset with millisecond precision using LMIC's time base,
// since we use LMIC's ostime_t txEnd as tx timestamp.
// Also apply calibration const to compensate processing time.
time_offset_ms += milliseconds(osticks2ms(os_getTime())) -
milliseconds(millis()) + milliseconds(TIME_SYNC_FIXUP);
//
// time_offset_ms += milliseconds(osticks2ms(os_getTime())) -
// milliseconds(millis());
// --------- not sure -----------------
// calculate absolute time in UTC epoch: convert to whole seconds, round to
// ceil, and calculate fraction milliseconds
// Apply calibration const to compensate processing time.
time_offset_ms += milliseconds(TIME_SYNC_FIXUP);
// calculate absolute time in UTC epoch: convert to whole seconds, round
// to ceil, and calculate fraction milliseconds
time_to_set = (uint32_t)(time_offset_ms.count() / 1000) + 1;
// calculate fraction milliseconds
time_to_set_fraction_msec = (uint16_t)(time_offset_ms.count() % 1000);