76 lines
2.7 KiB
C++
76 lines
2.7 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 "RTC_com.h"
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#define cfg_pin_RTC_SQW 3;
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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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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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static unsigned long RTCMillis; // blinking timer
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volatile unsigned long tmr_SQW;
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void rtc_interrupt() {
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tmr_SQW = micros();
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//Serial.print("DEBUG[INT] RTC interrupt "); Serial.println(micros());
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RTCMillis = millis();
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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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//Serial.println("DEBUG[RTC_loop()] Start");
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if (RTC_sec) { // do after RTC PseudoPPS interrupt, without interrupt NO time/date to display
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RTC_sec = false; // clear flag
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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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}
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Sec_Flip(now_t); // pass current datetime from RTC in UTC
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}
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if (millis() > (RTCMillis + 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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Serial.println("RTC set by GPS"); // debug
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}
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//End
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