123 lines
4.5 KiB
C++
123 lines
4.5 KiB
C++
/*
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RTC_com.cpp
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MIT License
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Copyright (c) 2023 hdrlux
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*/
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#include <Arduino.h> // for all the 'standard' Arduino stuff
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#include <DS3232RTC.h> // https://github.com/JChristensen/DS3232RTC
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#include <TimeLib.h> // https://github.com/PaulStoffregen/Time [valid until year 2099, no 2038 bug]
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#include "GPS_RTC_Clock.h"
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#include "RTC_com.h"
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#define cfg_pin_RTC_SQW 3;
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#ifndef DEBUG_PORT
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#define DEBUG_PORT Serial
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#endif
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// add the static modifier to limit visibility of these variables to just this file
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//static int ledPin_PPS = A6; // Pin for RTC PseudoPPS LED [analog PIN used as digital PIN]
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//static int ledPin_Sync = A7; // Pin for valid RTC Sync
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static byte RTC_1HZ_PIN = cfg_pin_RTC_SQW; // Pin 3 = NANO INT1, RTC provides a 1Hz interrupt signal on this Pin
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static time_t last_sync_t = 0; // last sync
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static byte sync_err_hours = 4; // set to 4 for DS3231M, may be set to 8 for DS3231SN. Warning if no GPS sync after n hours, possible 0.1 sec error.
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static bool RTCcolon = false;
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bool SyncErr = true;
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#include <DS3232RTC.h>
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DS3232RTC myRTC(0x68); // cfg_
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volatile bool RTC_sec = false; // flag for PseudoPPS
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volatile bool RTC_sync = false; // flag for RTC sync
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unsigned long RTCMicros; // blinking timer
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void rtc_interrupt() {
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//Serial.print("DEBUG[INT] RTC interrupt "); Serial.println(micros());
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RTCMicros = micros();
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RTC_sec = true;
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}
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void RTC_LED_setup() {
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//pinMode(ledPin_PPS, OUTPUT);
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//pinMode(ledPin_Sync, OUTPUT);
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//digitalWrite(ledPin_PPS, LOW); // LED off
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//digitalWrite(ledPin_Sync, LOW); // LED off
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}
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void RTC_setup() {
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pinMode(RTC_1HZ_PIN, INPUT_PULLUP); // enable pullup on interrupt pin (RTC SQW pin is open drain)
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attachInterrupt(digitalPinToInterrupt(RTC_1HZ_PIN), rtc_interrupt, FALLING); // HIGH 500ms after start of second
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myRTC.begin();
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myRTC.squareWave(DS3232RTC::SQWAVE_1_HZ); // 1 Hz square wave
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RTC_sec = false;
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}
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void RTC_loop() {
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if (RTC_sec) { // do after RTC PseudoPPS interrupt, without interrupt NO time/date to display
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//DEBUG_PORT.println("DEBUG[RTC_loop()] RTC_sec: " + String(RTC_sec));
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//DEBUG_PORT.println("DEBUG[RTC_loop()] RTCMicros: " + String(RTCMicros));
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//DEBUG_PORT.println("DEBUG[RTC_loop()] millis: " + String(millis()));
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lcd.setCursor(13, 0);
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lcd.print(":");
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RTCcolon = true;
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RTC_sec = false; // clear flag
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int32_t drift = (int32_t)(GPSMicros - RTCMicros); // % (4294967295UL);
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// Корректировка переполнения (wrap-around)
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if (drift > 900000) // Если разница > 0.9 сек
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drift -= 1000000; // Корректируем на -1 сек
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else if (drift < -900000) // Если разница < -0.9 сек
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drift += 1000000; // Корректируем на +1 сек
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// Отображение дрейфа в правом нижнем углу LCD (16x2)
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String driftStr = String(drift);
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// Вычисляем позицию для выравнивания справа: 16 - длина строки
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lcd.setCursor(16 - driftStr.length(), 1);
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lcd.print(driftStr);
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DEBUG_PORT.println("SQW: " + String(RTCMicros) + "; drift: " + String(drift) + "; newSec: " + String(NewSec));
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if (abs(drift) > 20000 && !gps_on) RTC_sync = true;
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//digitalWrite(ledPin_PPS, LOW); // LED off
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time_t now_t = myRTC.get();
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if ((last_sync_t + (sync_err_hours * 3600)) < now_t) {
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SyncErr = true;
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//digitalWrite(ledPin_Sync, LOW); // LED off
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lcd.setCursor(0, 0);
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lcd.print("r");
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}
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Sec_Flip(now_t); // pass current datetime from RTC in UTC
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}
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else if (micros() - RTCMicros >= 500000 && RTCcolon) {
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lcd.setCursor(13, 0);
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lcd.print(" ");
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RTCcolon = false;
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NewSec = false;
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}
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else {
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NewSec = false;
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}
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/*if (millis() > (RTCMicros + 100)) { // do 100ms after PseudoPPS interrupt
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digitalWrite(ledPin_PPS, HIGH); // LED on
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}*/
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}
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void SetRTC(time_t t) {
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myRTC.set(t + 1); // the GPS NMEA output is 1 second behind at PPS !!
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last_sync_t = t;
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SyncErr = false;
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//digitalWrite(ledPin_Sync, HIGH); // LED on
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DEBUG_PORT.println("RTC set by GPS"); // debug
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lcd.setCursor(0, 0);
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lcd.print("R");
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char segment[9];
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snprintf(segment, sizeof(segment),"%.2u:%.2u:%.2u", hour(t), minute(t), second(t));
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lcd.setCursor(0, 1);
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lcd.print(segment);
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}
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//End
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