322 lines
9.5 KiB
C++
322 lines
9.5 KiB
C++
#include "timekeeper.h"
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#include "paxcounter.conf"
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#if !(HAS_LORA)
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#if (TIME_SYNC_LORASERVER)
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#error TIME_SYNC_LORASERVER defined, but device has no LORA configured
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#elif (TIME_SYNC_LORAWAN)
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#error TIME_SYNC_LORAWAN defined, but device has no LORA configured
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#endif
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#endif
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// Local logging tag
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static const char TAG[] = __FILE__;
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// symbol to display current time source
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const char timeSetSymbols[] = {'G', 'R', 'L', '?'};
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#ifdef HAS_IF482
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#if (HAS_SDS011)
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#error cannot use IF482 together with SDS011 (both use UART#2)
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#endif
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HardwareSerial IF482(2); // use UART #2 (#1 may be in use for serial GPS)
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#endif
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Ticker timesyncer;
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void timeSync() { xTaskNotify(irqHandlerTask, TIMESYNC_IRQ, eSetBits); }
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void calibrateTime(void) {
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time_t t = 0;
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uint16_t t_msec = 0;
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// kick off asychronous lora timesync if we have
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#if (HAS_LORA) && (TIME_SYNC_LORASERVER) || (TIME_SYNC_LORAWAN)
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timesync_request();
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#endif
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// (only!) if we lost time, we try to fallback to local time source RTS or GPS
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if (timeSource == _unsynced) {
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// has RTC -> fallback to RTC time
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#ifdef HAS_RTC
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t = get_rtctime();
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timeSource = _rtc;
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#endif
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// no RTC -> fallback to GPS time
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#if (HAS_GPS)
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t = get_gpstime(&t_msec);
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timeSource = _gps;
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#endif
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if (t)
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setMyTime((uint32_t)t, t_msec, timeSource); // set time
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} // fallback
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else
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// no fallback time source available -> we can't set time
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return;
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} // calibrateTime()
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// adjust system time, calibrate RTC and RTC_INT pps
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void IRAM_ATTR setMyTime(uint32_t t_sec, uint16_t t_msec,
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timesource_t mytimesource) {
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// called with invalid timesource?
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if (mytimesource == _unsynced)
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return;
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// increment t_sec only if t_msec > 1000
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time_t time_to_set = (time_t)(t_sec + t_msec / 1000);
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// do we have a valid time?
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if (timeIsValid(time_to_set)) {
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// if we have msec fraction, then wait until top of second with
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// millisecond precision
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if (t_msec % 1000) {
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time_to_set++;
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vTaskDelay(pdMS_TO_TICKS(1000 - t_msec % 1000));
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}
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ESP_LOGD(TAG, "[%0.3f] UTC time: %d.%03d sec", millis() / 1000.0,
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time_to_set, t_msec % 1000);
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// if we have got an external timesource, set RTC time and shift RTC_INT pulse
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// to top of second
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#ifdef HAS_RTC
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if ((mytimesource == _gps) || (mytimesource == _lora))
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set_rtctime(time_to_set);
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#endif
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// if we have a software pps timer, shift it to top of second
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#if (!defined GPS_INT && !defined RTC_INT)
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timerWrite(ppsIRQ, 0); // reset pps timer
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CLOCKIRQ(); // fire clock pps, this advances time 1 sec
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#endif
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setTime(time_to_set); // set the time on top of second
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timeSource = mytimesource; // set global variable
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timesyncer.attach(TIME_SYNC_INTERVAL * 60, timeSync);
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ESP_LOGI(TAG, "[%0.3f] Timesync finished, time was set | source: %c",
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millis() / 1000.0, timeSetSymbols[mytimesource]);
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} else {
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timesyncer.attach(TIME_SYNC_INTERVAL_RETRY * 60, timeSync);
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ESP_LOGI(TAG, "[%0.3f] Timesync failed, invalid time fetched | source: %c",
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millis() / 1000.0, timeSetSymbols[mytimesource]);
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}
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}
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// helper function to setup a pulse per second for time synchronisation
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uint8_t timepulse_init() {
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// use time pulse from GPS as time base with fixed 1Hz frequency
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#ifdef GPS_INT
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// setup external interupt pin for rising edge GPS INT
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pinMode(GPS_INT, INPUT_PULLDOWN);
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// setup external rtc 1Hz clock as pulse per second clock
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ESP_LOGI(TAG, "Timepulse: external (GPS)");
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return 1; // success
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// use pulse from on board RTC chip as time base with fixed frequency
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#elif defined RTC_INT
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// setup external interupt pin for falling edge RTC INT
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pinMode(RTC_INT, INPUT_PULLUP);
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// setup external rtc 1Hz clock as pulse per second clock
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if (I2C_MUTEX_LOCK()) {
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Rtc.SetSquareWavePinClockFrequency(DS3231SquareWaveClock_1Hz);
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Rtc.SetSquareWavePin(DS3231SquareWavePin_ModeClock);
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I2C_MUTEX_UNLOCK();
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ESP_LOGI(TAG, "Timepulse: external (RTC)");
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return 1; // success
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} else {
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ESP_LOGE(TAG, "RTC initialization error, I2C bus busy");
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return 0; // failure
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}
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return 1; // success
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#else
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// use ESP32 hardware timer as time base with adjustable frequency
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ppsIRQ = timerBegin(1, 8000, true); // set 80 MHz prescaler to 1/10000 sec
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timerAlarmWrite(ppsIRQ, 10000, true); // 1000ms
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ESP_LOGI(TAG, "Timepulse: internal (ESP32 hardware timer)");
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return 1; // success
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#endif
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} // timepulse_init
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void timepulse_start(void) {
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#ifdef GPS_INT // start external clock gps pps line
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attachInterrupt(digitalPinToInterrupt(GPS_INT), CLOCKIRQ, RISING);
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#elif defined RTC_INT // start external clock rtc
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attachInterrupt(digitalPinToInterrupt(RTC_INT), CLOCKIRQ, FALLING);
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#else // start internal clock esp32 hardware timer
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timerAttachInterrupt(ppsIRQ, &CLOCKIRQ, true);
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timerAlarmEnable(ppsIRQ);
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#endif
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// start cyclic time sync
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timeSync(); // init systime by RTC or GPS or LORA
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timesyncer.attach(TIME_SYNC_INTERVAL * 60, timeSync);
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}
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// interrupt service routine triggered by either pps or esp32 hardware timer
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void IRAM_ATTR CLOCKIRQ(void) {
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BaseType_t xHigherPriorityTaskWoken = pdFALSE;
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SyncToPPS(); // advance systime, see microTime.h
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// advance wall clock, if we have
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#if (defined HAS_IF482 || defined HAS_DCF77)
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xTaskNotifyFromISR(ClockTask, uint32_t(now()), eSetBits,
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&xHigherPriorityTaskWoken);
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#endif
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// flip time pulse ticker, if needed
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#ifdef HAS_DISPLAY
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#if (defined GPS_INT || defined RTC_INT)
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TimePulseTick = !TimePulseTick; // flip pulse ticker
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#endif
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#endif
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// yield only if we should
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if (xHigherPriorityTaskWoken)
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portYIELD_FROM_ISR();
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}
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// helper function to check plausibility of a time
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time_t timeIsValid(time_t const t) {
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// is it a time in the past? we use compile date to guess
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return (t >= compiledUTC() ? t : 0);
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}
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// helper function to convert compile time to UTC time
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time_t compiledUTC(void) {
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static time_t t = myTZ.toUTC(RtcDateTime(__DATE__, __TIME__).Epoch32Time());
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return t;
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}
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// helper function to calculate serial transmit time
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TickType_t tx_Ticks(uint32_t framesize, unsigned long baud, uint32_t config,
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int8_t rxPin, int8_t txPins) {
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uint32_t databits = ((config & 0x0c) >> 2) + 5;
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uint32_t stopbits = ((config & 0x20) >> 5) + 1;
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uint32_t txTime = (databits + stopbits + 1) * framesize * 1000.0 / baud;
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// +1 for the startbit
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return round(txTime);
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}
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#if (defined HAS_IF482 || defined HAS_DCF77)
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#if (defined HAS_DCF77 && defined HAS_IF482)
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#error You must define at most one of IF482 or DCF77!
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#endif
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void clock_init(void) {
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// setup clock output interface
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#ifdef HAS_IF482
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IF482.begin(HAS_IF482);
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#elif defined HAS_DCF77
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pinMode(HAS_DCF77, OUTPUT);
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#endif
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time_t userUTCTime = now();
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xTaskCreatePinnedToCore(clock_loop, // task function
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"clockloop", // name of task
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2048, // stack size of task
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(void *)&userUTCTime, // start time as task parameter
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4, // priority of the task
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&ClockTask, // task handle
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1); // CPU core
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assert(ClockTask); // has clock task started?
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} // clock_init
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void clock_loop(void *taskparameter) { // ClockTask
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// caveat: don't use now() in this task, it will cause a race condition
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// due to concurrent access to i2c bus when reading/writing from/to rtc chip!
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#define nextmin(t) (t + DCF77_FRAME_SIZE + 1) // next minute
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#ifdef HAS_TWO_LED
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static bool led1_state = false;
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#endif
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uint32_t printtime;
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time_t t = *((time_t *)taskparameter), last_printtime = 0; // UTC time seconds
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#ifdef HAS_DCF77
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uint8_t *DCFpulse; // pointer on array with DCF pulse bits
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DCFpulse = DCF77_Frame(nextmin(t)); // load first DCF frame before start
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#elif defined HAS_IF482
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static TickType_t txDelay = pdMS_TO_TICKS(1000 - IF482_SYNC_FIXUP) -
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tx_Ticks(IF482_FRAME_SIZE, HAS_IF482);
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#endif
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// output the next second's pulse/telegram after pps arrived
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for (;;) {
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// wait for timepulse and store UTC time in seconds got
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xTaskNotifyWait(0x00, ULONG_MAX, &printtime, portMAX_DELAY);
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t = time_t(printtime);
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// no confident or no recent time -> suppress clock output
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if ((timeStatus() == timeNotSet) || !(timeIsValid(t)) ||
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(t == last_printtime))
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continue;
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#if defined HAS_IF482
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// wait until moment to fire. Normally we won't get notified during this
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// timespan, except when next pps pulse arrives while waiting, because pps
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// was adjusted by recent time sync
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if (xTaskNotifyWait(0x00, ULONG_MAX, &printtime, txDelay) == pdTRUE)
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t = time_t(printtime); // new adjusted UTC time seconds
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// send IF482 telegram
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IF482.print(IF482_Frame(t + 1)); // note: telegram is for *next* second
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#elif defined HAS_DCF77
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if (second(t) == DCF77_FRAME_SIZE - 1) // is it time to load new frame?
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DCFpulse = DCF77_Frame(nextmin(t)); // generate frame for next minute
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if (minute(nextmin(t)) == // do we still have a recent frame?
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DCFpulse[DCF77_FRAME_SIZE]) // (timepulses could be missed!)
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DCF77_Pulse(t, DCFpulse); // then output current second's pulse
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// else we have no recent frame, thus suppressing clock output
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#endif
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// pps blink on secondary LED if we have one
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#ifdef HAS_TWO_LED
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if (led1_state)
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switch_LED1(LED_OFF);
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else
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switch_LED1(LED_ON);
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led1_state = !led1_state;
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#endif
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last_printtime = t;
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} // for
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} // clock_loop()
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#endif // HAS_IF482 || defined HAS_DCF77
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