DigitalInfinity/ESP32-PaxCounter
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timesync.cpp comments polished

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This commit is contained in:
Klaus K Wilting 2020-03-07 23:47:36 +01:00
parent 208376a232
commit bf4f3c0e8f
1 changed files with 8 additions and 12 deletions
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20
src/timesync.cpp
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@ -99,15 +99,11 @@ void IRAM_ATTR timesync_processReq(void *taskparameter) {
// open a receive window to immediately get DevTimeAns
LMIC_sendAlive();
#endif
// open a receive window to immediately get the answer (Class A device)
// LMIC_sendAlive();
// wait until a timestamp was received
if (xTaskNotifyWait(0x00, ULONG_MAX, &seqNo,
pdMS_TO_TICKS(TIME_SYNC_TIMEOUT * 1000)) == pdFALSE) {
ESP_LOGW(TAG, "[%0.3f] Timesync aborted: timed out", millis() / 1000.0);
goto Fail; // no valid sequence received before timeout
goto Fail; // no timestamp received before timeout
}
// check if we are in handshake with server
@ -122,11 +118,11 @@ void IRAM_ATTR timesync_processReq(void *taskparameter) {
timesync_timestamp[sample_idx][timesync_tx];
// increment and wrap around seqNo, keeping it in time port range
WRAP(time_sync_seqNo, TIMEREQUEST_MAX_SEQNO);
// increment index for timestamp array
WRAP(time_sync_seqNo, TIMEREQUEST_MAX_SEQNO);
sample_idx++;
// if last cycle, finish after, else pause until next cycle
// if we are not in last cycle, pause until next cycle
if (i < TIME_SYNC_SAMPLES - 1)
vTaskDelay(pdMS_TO_TICKS(TIME_SYNC_CYCLE * 1000));
@ -137,14 +133,14 @@ void IRAM_ATTR timesync_processReq(void *taskparameter) {
// mask application irq to ensure accurate timing
mask_user_IRQ();
// average time offset over the summed up difference
// calculate average time offset over the summed up difference
// + add msec from recent gateway time, found with last sample_idx
// + apply a compensation constant TIME_SYNC_FIXUP for processing time
// + apply a compensation constant for processing times node + gateway
time_offset_ms /= TIME_SYNC_SAMPLES;
time_offset_ms +=
timesync_timestamp[sample_idx - 1][gwtime_msec] + TIME_SYNC_FIXUP;
// calculate absolute time in UTC epoch: take latest time received from
// calculate absolute UTC time: take latest timestamp received from
// gateway, convert to whole seconds, round to ceil, add fraction seconds
setMyTime(timesync_timestamp[sample_idx - 1][gwtime_sec] +
time_offset_ms / 1000,
@ -176,7 +172,7 @@ void timesync_storeReq(uint32_t timestamp, timesync_t timestamp_type) {
timesync_timestamp[sample_idx][timestamp_type] = timestamp;
}
// callback function to receive network time server answer
// callback function to receive time answer from network or answer
void IRAM_ATTR timesync_serverAnswer(void *pUserData, int flag) {
// if no timesync handshake is pending then exit
@ -259,7 +255,7 @@ void IRAM_ATTR timesync_serverAnswer(void *pUserData, int flag) {
#endif // (TIME_SYNC_LORAWAN)
Finish:
// check if calucalted time is recent
// check if calculated time is recent
if (timeIsValid(timestamp_sec)) {
// store time received from gateway
timesync_storeReq(timestamp_sec, gwtime_sec);