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RTC sync with GPS v1.2

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This commit is contained in:
Andrey Pazychev
2025-06-14 22:26:02 +03:00
parent fc069bd63e
commit 893a5d2db4
4 changed files with 102 additions and 38 deletions
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4
GPS_RTC_Clock.h
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@@ -39,8 +39,8 @@ extern bool NewHour; // pass to main ino = Hour ready to print
extern time_t Loc_t, RTC_t; // pass to main ino = Local timestamp extern time_t Loc_t, RTC_t; // pass to main ino = Local timestamp
extern bool gps_on; extern bool gps_on;
extern volatile bool GPS_sec, RTC_sec; extern volatile bool GPS_sec, RTC_sec, RTC_sync;
extern unsigned long RTCMillis, GPSMillis;// call from main ino, GPS_RTC_Clock.h extern unsigned long RTCMicros, GPSMicros;// call from main ino, GPS_RTC_Clock.h
extern LiquidCrystal_I2C lcd; extern LiquidCrystal_I2C lcd;
void GPS_RTC_Clock_setup(); void GPS_RTC_Clock_setup();

14
GPS_RTC_Clock.ino
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@@ -34,7 +34,9 @@ void setup() { // the setup function runs once when you
lcd.clear(); lcd.clear();
lcd.backlight(); lcd.backlight();
lcd.setCursor(0,0); lcd.setCursor(0,0);
lcd.print("DEBUG[setup()]"); lcd.print("RTC sync GPS");
lcd.setCursor(0,1);
lcd.print("v1.2");
DEBUG_PORT.begin(38400); DEBUG_PORT.begin(38400);
DEBUG_PORT.flush(); DEBUG_PORT.flush();
delay(1000); delay(1000);
@@ -87,24 +89,24 @@ void RTCtoLCD() {
char message[50]; char message[50];
if (NewSec) { if (NewSec) {
DEBUG_PORT.println("DEBUG[RTCtoLCD] newSec"); //DEBUG_PORT.println("DEBUG[RTCtoLCD] newSec");
//DEBUG_PORT.println("DEBUG[RTCtoLCD] RTCMillis: " + String(RTCMillis)); //DEBUG_PORT.println("DEBUG[RTCtoLCD] RTCMicros: " + String(RTCMicros));
//DEBUG_PORT.println("DEBUG[RTCtoLCD] RTC_sec: " + String(RTC_sec)); //DEBUG_PORT.println("DEBUG[RTCtoLCD] RTC_sec: " + String(RTC_sec));
//DEBUG_PORT.println("DEBUG[RTCtoLCD] millis: " + String(millis())); //DEBUG_PORT.println("DEBUG[RTCtoLCD] millis: " + String(millis()));
//snprintf(segment, sizeof(segment),"%.2u", second(Loc_t)); //snprintf(segment, sizeof(segment),"%.2u", second(Loc_t));
snprintf(segment, sizeof(segment),"%.2u", second(RTC_t)); snprintf(segment, sizeof(segment),"%.2u", second(RTC_t));
lcd.setCursor(6, 0); lcd.setCursor(14, 0);
lcd.print(segment); lcd.print(segment);
} }
if (NewMin) { if (NewMin) {
//snprintf(segment, sizeof(segment),"%.2u", minute(Loc_t)); //snprintf(segment, sizeof(segment),"%.2u", minute(Loc_t));
snprintf(segment, sizeof(segment),"%.2u", minute(RTC_t)); snprintf(segment, sizeof(segment),"%.2u", minute(RTC_t));
lcd.setCursor(3, 0); lcd.setCursor(11, 0);
lcd.print(segment); lcd.print(segment);
//snprintf(segment, sizeof(segment),"%.2u", hour(Loc_t)); //snprintf(segment, sizeof(segment),"%.2u", hour(Loc_t));
snprintf(segment, sizeof(segment),"%.2u", hour(RTC_t)); snprintf(segment, sizeof(segment),"%.2u", hour(RTC_t));
lcd.setCursor(0, 0); lcd.setCursor(8, 0);
lcd.print(segment); lcd.print(segment);
} }
} }

58
GPS_com.cpp
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@@ -23,12 +23,13 @@ static bool gps_on; // flag for GPS ON/OFF
static int pulse_count = 0; static int pulse_count = 0;
static time_t gps_seconds_t = 0; // GPS time static time_t gps_seconds_t = 0; // GPS time
static byte gps_sats = 0; static byte gps_sats = 0;
static bool GPScolon = false;
volatile bool GPS_sec = false; // flag for GPS-PPS volatile bool GPS_sec = false; // flag for GPS-PPS
unsigned long GPSMillis; unsigned long GPSMicros;
// set interrupt flag // set interrupt flag
void gps_interrupt() { void gps_interrupt() {
GPSMillis = micros(); GPSMicros = micros();
GPS_sec = true; GPS_sec = true;
} }
@@ -78,7 +79,7 @@ const char RMC_off [] PROGMEM = "PUBX,40,RMC,0,0,0,0";
const char ZDA_off [] PROGMEM = "PUBX,40,ZDA,0,0,0,0"; const char ZDA_off [] PROGMEM = "PUBX,40,ZDA,0,0,0,0";
const char RMC_on [] PROGMEM = "PUBX,40,RMC,0,1,0,0"; const char RMC_on [] PROGMEM = "PUBX,40,RMC,0,1,0,0";
const char ZDA_on [] PROGMEM = "PUBX,40,ZDA,0,1,0,0"; const char ZDA_on [] PROGMEM = "PUBX,40,ZDA,0,1,0,0";
bool GPS_PPS_LCD; // bool GPS_PPS_LCD;
void GPS_setup() { void GPS_setup() {
DEBUG_PORT.println(F("DEBUG[GPS_setup()] start")); DEBUG_PORT.println(F("DEBUG[GPS_setup()] start"));
@@ -123,32 +124,52 @@ void GPS_loop() {
if (GPS_sec) { // do after GPS PPS interrupt if (GPS_sec) { // do after GPS PPS interrupt
GPS_sec = false; // clear flag GPS_sec = false; // clear flag
GPScolon = true;
lcd.setCursor(2, 0); GPS_PPS_LCD = !GPS_PPS_LCD; lcd.setCursor(10, 0);
lcd.print((GPS_PPS_LCD) ? " " : ":"); lcd.print(":");
GPS_PPS(); GPS_PPS();
DEBUG_PORT.println("PPS: " + String(GPSMicros));
}
else if (micros() - GPSMicros >= 500000 && GPScolon) {
lcd.setCursor(10, 0);
lcd.print(" ");
GPScolon = false;
} }
GPS_read_seconds(); // continue reading buffer GPS_read_seconds(); // continue reading buffer
} }
void GPS_PPS() { // do something on the flip of the GPS second void GPS_PPS() { // do something on the flip of the GPS second
int32_t drift = (RTCMillis - GPSMillis); // % (4294967295UL); int32_t drift = (int32_t)(GPSMicros - RTCMicros); // % (4294967295UL);
//DEBUG_PORT.println("DEBUG[GPS_PPS()] Start"); // Корректировка переполнения (wrap-around)
if (drift > 900000) if (drift > 900000) // Если разница > 0.9 сек
drift -= 1000000; drift -= 1000000; // Корректируем на -1 сек
else if (drift < -900000) else if (drift < -900000) // Если разница < -0.9 сек
drift += 1000000; drift += 1000000; // Корректируем на +1 сек
//DEBUG_PORT.println("DEBUG[GPS_loop()] drift: " + String(drift)); //DEBUG_PORT.println("DEBUG[GPS_loop()] drift: " + String(drift));
lcd.setCursor((16 - sizeof(String(drift))), 1); // Отображение дрейфа в правом нижнем углу LCD (16x2)
lcd.print(drift); String driftStr = String(drift);
if (String(drift).length() > 6) driftStr = " error";
// Вычисляем позицию для выравнивания справа: 16 - длина строки
lcd.setCursor(16 - driftStr.length(), 1);
lcd.print(driftStr);
//if (abs(drift) > 20000 && !gps_on) GPS_ON();
if (RTC_sync && !gps_on) {
GPS_ON();
}
if (drift > 5000 && !gps_on) GPS_ON();
if (gps_on) { // do only when needed if (gps_on) { // do only when needed
if (pulse_count == 0) {
lcd.setCursor(2, 0);
lcd.print("S");
}
pulse_count += 1; pulse_count += 1;
if (pulse_count > 2) { // skip first PPS-Pulses, to make shure time is from satellite if (pulse_count > 4) { // skip first PPS-Pulses, to make shure time is from satellite
if (gps_seconds_t != 0) { // do only if value is set if (gps_seconds_t != 0) { // do only if value is set
// gps_seconds_t += offset_28y; // debug & testing only! // gps_seconds_t += offset_28y; // debug & testing only!
// gps_seconds_t += offset_26w; // debug & testing only! // gps_seconds_t += offset_26w; // debug & testing only!
@@ -177,12 +198,17 @@ void GPS_ON() {
gps_on = true; gps_on = true;
gps_seconds_t = 0; // make shure GPS serial is alive before setting gps_seconds_t = 0; // make shure GPS serial is alive before setting
pulse_count = 0; pulse_count = 0;
lcd.setCursor(2, 0);
lcd.print("S");
} }
void GPS_OFF() { void GPS_OFF() {
if (gps_on) { // only if NOT off if (gps_on) { // only if NOT off
gps_on = false; gps_on = false;
RTC_sync = false;
//Serial.println("GPS: OFF"); // debug //Serial.println("GPS: OFF"); // debug
lcd.setCursor(2, 0);
lcd.print(" ");
} }
} }

64
RTC_com.cpp
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@@ -17,29 +17,31 @@
#endif #endif
// add the static modifier to limit visibility of these variables to just this file // add the static modifier to limit visibility of these variables to just this file
static int ledPin_PPS = A6; // Pin for RTC PseudoPPS LED [analog PIN used as digital PIN] //static int ledPin_PPS = A6; // Pin for RTC PseudoPPS LED [analog PIN used as digital PIN]
static int ledPin_Sync = A7; // Pin for valid RTC Sync //static int ledPin_Sync = A7; // Pin for valid RTC Sync
static byte RTC_1HZ_PIN = cfg_pin_RTC_SQW; // Pin 3 = NANO INT1, RTC provides a 1Hz interrupt signal on this Pin static byte RTC_1HZ_PIN = cfg_pin_RTC_SQW; // Pin 3 = NANO INT1, RTC provides a 1Hz interrupt signal on this Pin
static time_t last_sync_t = 0; // last sync static time_t last_sync_t = 0; // last sync
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. 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.
bool SyncErr = true, RTC_SQW_LCD; static bool RTCcolon = false;
bool SyncErr = true;
#include <DS3232RTC.h> #include <DS3232RTC.h>
DS3232RTC myRTC(0x68); // cfg_ DS3232RTC myRTC(0x68); // cfg_
volatile bool RTC_sec = false; // flag for PseudoPPS volatile bool RTC_sec = false; // flag for PseudoPPS
unsigned long RTCMillis; // blinking timer volatile bool RTC_sync = false; // flag for RTC sync
unsigned long RTCMicros; // blinking timer
void rtc_interrupt() { void rtc_interrupt() {
//Serial.print("DEBUG[INT] RTC interrupt "); Serial.println(micros()); //Serial.print("DEBUG[INT] RTC interrupt "); Serial.println(micros());
RTCMillis = micros(); RTCMicros = micros();
RTC_sec = true; RTC_sec = true;
} }
void RTC_LED_setup() { void RTC_LED_setup() {
pinMode(ledPin_PPS, OUTPUT); //pinMode(ledPin_PPS, OUTPUT);
pinMode(ledPin_Sync, OUTPUT); //pinMode(ledPin_Sync, OUTPUT);
digitalWrite(ledPin_PPS, LOW); // LED off //digitalWrite(ledPin_PPS, LOW); // LED off
digitalWrite(ledPin_Sync, LOW); // LED off //digitalWrite(ledPin_Sync, LOW); // LED off
} }
void RTC_setup() { void RTC_setup() {
@@ -53,25 +55,52 @@ void RTC_setup() {
void RTC_loop() { void RTC_loop() {
if (RTC_sec) { // do after RTC PseudoPPS interrupt, without interrupt NO time/date to display if (RTC_sec) { // do after RTC PseudoPPS interrupt, without interrupt NO time/date to display
//DEBUG_PORT.println("DEBUG[RTC_loop()] RTC_sec: " + String(RTC_sec)); //DEBUG_PORT.println("DEBUG[RTC_loop()] RTC_sec: " + String(RTC_sec));
//DEBUG_PORT.println("DEBUG[RTC_loop()] RTCMillis: " + String(RTCMillis)); //DEBUG_PORT.println("DEBUG[RTC_loop()] RTCMicros: " + String(RTCMicros));
//DEBUG_PORT.println("DEBUG[RTC_loop()] millis: " + String(millis())); //DEBUG_PORT.println("DEBUG[RTC_loop()] millis: " + String(millis()));
lcd.setCursor(5, 0); RTC_SQW_LCD = !RTC_SQW_LCD; lcd.setCursor(13, 0);
lcd.print((RTC_SQW_LCD) ? " " : ":"); lcd.print(":");
RTCcolon = true;
RTC_sec = false; // clear flag RTC_sec = false; // clear flag
digitalWrite(ledPin_PPS, LOW); // LED off
int32_t drift = (int32_t)(GPSMicros - RTCMicros); // % (4294967295UL);
// Корректировка переполнения (wrap-around)
if (drift > 900000) // Если разница > 0.9 сек
drift -= 1000000; // Корректируем на -1 сек
else if (drift < -900000) // Если разница < -0.9 сек
drift += 1000000; // Корректируем на +1 сек
// Отображение дрейфа в правом нижнем углу LCD (16x2)
String driftStr = String(drift);
// Вычисляем позицию для выравнивания справа: 16 - длина строки
lcd.setCursor(16 - driftStr.length(), 1);
lcd.print(driftStr);
DEBUG_PORT.println("SQW: " + String(RTCMicros) + "; drift: " + String(drift) + "; newSec: " + String(NewSec));
if (abs(drift) > 20000 && !gps_on) RTC_sync = true;
//digitalWrite(ledPin_PPS, LOW); // LED off
time_t now_t = myRTC.get(); time_t now_t = myRTC.get();
if ((last_sync_t + (sync_err_hours * 3600)) < now_t) { if ((last_sync_t + (sync_err_hours * 3600)) < now_t) {
SyncErr = true; SyncErr = true;
//digitalWrite(ledPin_Sync, LOW); // LED off //digitalWrite(ledPin_Sync, LOW); // LED off
lcd.setCursor(0, 0);
lcd.print("r");
} }
Sec_Flip(now_t); // pass current datetime from RTC in UTC Sec_Flip(now_t); // pass current datetime from RTC in UTC
} }
else if (micros() - RTCMicros >= 500000 && RTCcolon) {
lcd.setCursor(13, 0);
lcd.print(" ");
RTCcolon = false;
NewSec = false;
}
else { else {
NewSec = false; NewSec = false;
} }
/*if (millis() > (RTCMillis + 100)) { // do 100ms after PseudoPPS interrupt /*if (millis() > (RTCMicros + 100)) { // do 100ms after PseudoPPS interrupt
digitalWrite(ledPin_PPS, HIGH); // LED on digitalWrite(ledPin_PPS, HIGH); // LED on
}*/ }*/
} }
@@ -82,6 +111,13 @@ void SetRTC(time_t t) {
SyncErr = false; SyncErr = false;
//digitalWrite(ledPin_Sync, HIGH); // LED on //digitalWrite(ledPin_Sync, HIGH); // LED on
DEBUG_PORT.println("RTC set by GPS"); // debug DEBUG_PORT.println("RTC set by GPS"); // debug
lcd.setCursor(0, 0);
lcd.print("R");
char segment[9];
snprintf(segment, sizeof(segment),"%.2u:%.2u:%.2u", hour(t), minute(t), second(t));
lcd.setCursor(0, 1);
lcd.print(segment);
} }
//End //End