141 lines
4.8 KiB
C++
141 lines
4.8 KiB
C++
/*
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GPS_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 <NMEAGPS.h> // https://github.com/SlashDevin/NeoGPS
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#include <TimeLib.h> // https://github.com/PaulStoffregen/Time
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#include "GPS_com.h"
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#include "RTC_com.h" // to set the RTC
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#include "Serial_AdjustBaud.h" // for adjust serial port baudrate
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#define cfg_pin_GPS_PPS 2
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#define cfg_pin_GPS_Rx 8
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//#define cfg_pin_GPS_Tx 9;
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// add the static modifier to limit visibility of these variables to just this file
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static byte GPS_PPS_PIN = cfg_pin_GPS_PPS; // Pin 2 = NANO INT0, GPS PPS interrupt signal on this Pin
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static bool gps_on; // flag for GPS ON/OFF
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static int pulse_count = 0;
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static time_t gps_seconds_t = 0; // GPS time
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static byte gps_sats = 0;
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volatile bool GPS_sec = false; // flag for GPS-PPS
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volatile unsigned long tmr_PPS;
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// set interrupt flag
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void gps_interrupt() {
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tmr_PPS = micros();
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Serial.print("DEBUG[INT] GPS interrupt: "); Serial.println(tmr_PPS);
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//Serial.print("DEBUG[INT] GPS interrupt "); Serial.println(micros());
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GPS_sec = true;
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}
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NMEAGPS gps; // This parses the GPS characters
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gps_fix fix; // This holds on to the latest values
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//#include <AltSoftSerial.h>
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#include <GPSport.h> // use only for soft-serial
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//#define gpsPort Serial
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//#define GPS_PORT_NAME "Serial"
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#define GPS_PORT_NAME "AltSoftSerial"
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#define DEBUG_PORT Serial
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/***** Notice ********************************************
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Edit file \Arduino\libraries\NeoGPS\src\NMEAGPS_cfg.h
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UnComment line //#define NMEAGPS_PARSE_ZDA
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only process the NMEA sentences GGA, RMC en ZDA
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*********************************************************/
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/****** Notice *******************************************
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Edit file \Arduino\libraries\NeoGPS\src\NeoTime.h
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change both instances of the const name 'DAYS_PER_WEEK'
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to something else, they conflict with TimeLib.h
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*********************************************************/
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// Compile check processing for both RMC & ZDA message [both contain date & time]
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// Less dependent on GPS chip config
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#ifndef NMEAGPS_PARSE_RMC
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#error You must define NMEAGPS_PARSE_RMC in NMEAGPS_cfg.h!
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#endif
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#ifndef NMEAGPS_PARSE_ZDA
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#error You must define NMEAGPS_PARSE_ZDA in NMEAGPS_cfg.h!
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#endif
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#ifndef NMEAGPS_PARSE_GGA
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#error You must define NMEAGPS_PARSE_GGA in NMEAGPS_cfg.h!
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#endif
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const long POSIX_Y2K_offset = 946684800; // = 10957 days = 30 years, NeoTime (GPS) & TimeLib (RTC) library use different Epoch year, 2000 & 1970
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const long offset_28y = 883612800; // = 10227 days = 28 years, simple test for 2038 bug
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const long offset_26w = 15724800; // = 182 days = 26 weeks, simple test for timezone
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const long offset_135 = 123456; // = 135 seconds, simple test for timezone
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const char baud19200 [] PROGMEM = "PUBX,41,1,3,3,19200,0";
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void GPS_setup() {
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pinMode(GPS_PPS_PIN, INPUT_PULLUP); // enable pullup on interrupt pin
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attachInterrupt(digitalPinToInterrupt(GPS_PPS_PIN), gps_interrupt, RISING); // 100ms HIGH at start of second
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GPS_sec = false;
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gpsPort.begin(9600); // set PC to same baudrate for debug messages
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gps.send_P(&gpsPort, (const __FlashStringHelper *) baud19200);
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gpsPort.flush();
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delay(100);
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gpsPort.end();
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gpsPort.begin(19200);
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GPS_ON();
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}
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void GPS_loop() {
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if (GPS_sec) { // do after GPS PPS interrupt
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GPS_sec = false; // clear flag
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GPS_PPS();
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}
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GPS_read_seconds(); // continue reading buffer
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}
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void GPS_PPS() { // do something on the flip of the GPS second
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if (gps_on) { // do only when needed
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pulse_count += 1;
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if (pulse_count > 2) { // skip first PPS-Pulses, to make shure time is from satellite
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if (gps_seconds_t != 0) { // do only if value is set
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// gps_seconds_t += offset_28y; // debug & testing only!
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// gps_seconds_t += offset_26w; // debug & testing only!
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// gps_seconds_t += offset_135;
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Serial.println("DEBUG[GPS_PPS] difference PPS - SQW: " + String(tmr_PPS - tmr_SQW));
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SetRTC(gps_seconds_t); // sync RTC with GPS
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GPS_OFF();
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}
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}
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}
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}
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void GPS_read_seconds() {
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//Serial.println("DEBUG[GPS_read_second()] Start");
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while (gps.available(gpsPort)) {
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fix = gps.read();
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if (fix.valid.time && fix.valid.date) {
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gps_seconds_t = fix.dateTime + POSIX_Y2K_offset; // convert for different epoch year
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}
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if (fix.valid.satellites) {
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gps_sats = fix.satellites;
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}
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}
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}
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void GPS_ON() {
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gps_on = true;
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gps_seconds_t = 0; // make shure GPS serial is alive before setting
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pulse_count = 0;
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Serial.println("GPS: ON"); // debug
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}
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void GPS_OFF() {
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if (gps_on) { // only if NOT off
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gps_on = false;
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Serial.println("GPS: OFF"); // debug
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}
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}
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//End
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