diff --git a/include/timesync.h b/include/timesync.h index ddc7fff6..0cfe5571 100644 --- a/include/timesync.h +++ b/include/timesync.h @@ -7,7 +7,7 @@ #include "timekeeper.h" #define TIME_SYNC_SAMPLES 2 // number of time requests for averaging -#define TIME_SYNC_CYCLE 2 // seconds between two time requests +#define TIME_SYNC_CYCLE 20 // seconds between two time requests #define TIME_SYNC_TIMEOUT 120 // timeout seconds waiting for timeserver answer #define TIME_SYNC_TRIGGER 100 // time deviation in millisec triggering a sync #define TIME_SYNC_FRAME_LENGTH 0x06 // timeserver answer frame length diff --git a/src/lorawan.cpp b/src/lorawan.cpp index 7b0f51ee..102911c3 100644 --- a/src/lorawan.cpp +++ b/src/lorawan.cpp @@ -490,6 +490,9 @@ void user_request_network_time_callback(void *pVoidUserUTCTime, // Update system time with time read from the network if (timeIsValid(*pUserUTCTime)) { setTime(*pUserUTCTime); +#ifdef HAS_RTC + set_rtctime(*pUserUTCTime); // calibrate RTC if we have one +#endif timeSource = _lora; timesyncer.attach(TIME_SYNC_INTERVAL * 60, timeSync); // regular repeat ESP_LOGI(TAG, "Received recent time from LoRa"); diff --git a/src/timesync.cpp b/src/timesync.cpp index 5c3f2753..514a5ea3 100644 --- a/src/timesync.cpp +++ b/src/timesync.cpp @@ -20,8 +20,8 @@ static const char TAG[] = __FILE__; TaskHandle_t timeSyncReqTask; -static uint8_t time_sync_seqNo{}; -static bool lora_time_sync_pending{false}; +static uint8_t time_sync_seqNo = 0; +static bool lora_time_sync_pending = false; typedef std::chrono::system_clock myClock; typedef myClock::time_point myClock_timepoint; @@ -44,8 +44,8 @@ void send_timesync_req() { lora_time_sync_pending = true; - // initialize timestamp array - for (uint8_t i{}; i < TIME_SYNC_SAMPLES; i++) + // clear timestamp array + for (uint8_t i = 0; i < TIME_SYNC_SAMPLES; i++) time_sync_tx[i] = time_sync_rx[i] = myClock_timepoint(); // kick off temporary task for timeserver handshake processing @@ -63,12 +63,11 @@ void send_timesync_req() { // task for sending time sync requests void process_timesync_req(void *taskparameter) { - uint8_t k{}; + uint32_t seq_no = 0, time_to_set_us, time_to_set_ms; uint16_t time_to_set_fraction_msec; - uint32_t seq_no{}, time_to_set_us; - long long int time_to_set_ms; + uint8_t k = 0, i = 0; time_t time_to_set; - auto time_offset{myClock_msecTick::zero()}; + auto time_offset = myClock_msecTick::zero(); // wait until we are joined while (!LMIC.devaddr) { @@ -76,7 +75,7 @@ void process_timesync_req(void *taskparameter) { } // enqueue timestamp samples in lora sendqueue - for (uint8_t i{}; i < TIME_SYNC_SAMPLES; i++) { + for (uint8_t i = 0; i < TIME_SYNC_SAMPLES; i++) { // wrap around seqNo 0 .. 254 time_sync_seqNo = (time_sync_seqNo >= 255) ? 0 : time_sync_seqNo + 1; @@ -122,20 +121,19 @@ void process_timesync_req(void *taskparameter) { ESP_LOGD(TAG, "[%0.3f] avg time diff: %0.3f sec", millis() / 1000.0, myClock_secTick(time_offset).count()); - // calculate absolute time with millisecond precision - time_to_set_ms = (long long)now(time_to_set_us) * 1000LL + - time_to_set_us / 1000LL + time_offset.count(); + // calculate absolute time offset with millisecond precision using time base + // of LMIC os, since we use LMIC's ostime_t txEnd as tx timestamp + time_offset += milliseconds(osticks2ms(os_getTime())); // convert to seconds - time_to_set = (time_t)(time_to_set_ms / 1000LL); + time_to_set = static_cast(myClock_secTick(time_offset).count()); // calculate fraction milliseconds - time_to_set_fraction_msec = (uint16_t)(time_to_set_ms % 1000LL); + time_to_set_fraction_msec = static_cast(time_offset.count() % 1000); ESP_LOGD(TAG, "[%0.3f] Calculated UTC epoch time: %d.%03d sec", millis() / 1000.0, time_to_set, time_to_set_fraction_msec); // adjust system time if (timeIsValid(time_to_set)) { - if (abs(time_offset.count()) >= TIME_SYNC_TRIGGER) { // milliseconds threshold @@ -150,9 +148,12 @@ void process_timesync_req(void *taskparameter) { CLOCKIRQ(); // fire clock pps interrupt } - setTime(time_to_set + 1); - timeSource = _lora; + setTime(++time_to_set); // +1 sec after waiting for top of seceond +#ifdef HAS_RTC + set_rtctime(time_to_set); // calibrate RTC if we have one +#endif + timeSource = _lora; timesyncer.attach(TIME_SYNC_INTERVAL * 60, timeSync); // set to regular repeat ESP_LOGI(TAG, "[%0.3f] Timesync finished, time adjusted by %.3f sec", @@ -170,15 +171,15 @@ finish: } // called from lorawan.cpp after time_sync_req was sent -void store_time_sync_req(uint32_t t_millisec) { +void store_time_sync_req(uint32_t t_txEnd_ms) { - uint8_t k{time_sync_seqNo % TIME_SYNC_SAMPLES}; + uint8_t k = time_sync_seqNo % TIME_SYNC_SAMPLES; - time_sync_tx[k] += milliseconds(t_millisec); + time_sync_tx[k] += milliseconds(t_txEnd_ms); ESP_LOGD(TAG, "[%0.3f] Timesync request #%d sent at %d.%03d", - millis() / 1000.0, time_sync_seqNo, t_millisec / 1000, - t_millisec % 1000); + millis() / 1000.0, time_sync_seqNo, t_txEnd_ms / 1000, + t_txEnd_ms % 1000); } // process timeserver timestamp answer, called from lorawan.cpp @@ -188,16 +189,16 @@ int recv_timesync_ans(uint8_t buf[], uint8_t buf_len) { if ((!lora_time_sync_pending) || (buf_len != TIME_SYNC_FRAME_LENGTH)) return 0; // failure - uint8_t seq_no{buf[0]}, k{seq_no % TIME_SYNC_SAMPLES}; + uint8_t seq_no = buf[0], k = seq_no % TIME_SYNC_SAMPLES; uint16_t timestamp_msec; // convert 1/250th sec fractions to ms uint32_t timestamp_sec; // get the timeserver time. // The first 4 bytes contain the UTC seconds since unix epoch. - // Octet order is little endian. Casts are necessary, because buf is an array + // Octet order is big endian. Casts are necessary, because buf is an array // of single byte values, and they might overflow when shifted - timestamp_sec = ((uint32_t)buf[1]) | (((uint32_t)buf[2]) << 8) | - (((uint32_t)buf[3]) << 16) | (((uint32_t)buf[4]) << 24); + timestamp_sec = ((uint32_t)buf[4]) | (((uint32_t)buf[3]) << 8) | + (((uint32_t)buf[2]) << 16) | (((uint32_t)buf[1]) << 24); // The 5th byte contains the fractional seconds in 2^-8 second steps timestamp_msec = 4 * buf[5];