Paul
I don’t understand the part about “Check that you are passing the Wire1 port…”. I’ve posted my code [less the huge comments] below, hopefully that is ok to do.
I am not reading the RTC, only checking if its there and writing the GPS time to it.
Johnny
16 #include <Wire.h> //Needed for I2C to GNSS
17
18 #include <SparkFun_u-blox_GNSS_Arduino_Library.h> //http://librarymanager/All#SparkFun_u-blox_GNSS
19 SFE_UBLOX_GNSS myGNSS;
20
21 long lastTime = 0; //Simple local timer. Limits amount if I2C traffic to u-blox module.
29
30 int count;
31
32 #include <SPI.h> //Needed for the Adafruit SPI SD module
33 #include <SD.h>
34
35 File myFile;
41 #include “RTClib.h”
42
43 RTC_DS3231 rtc;
44
48 int mySecond;
49 int myMinute;
50 int myHour;
51 int myDay;
52 int myMonth;
53 int myYear;
60
61 void setup () {
62
63 Serial.begin(115200); // Needs to be 115200 for the GPS to work properly
64
65 while (!Serial);
66 delay(3000);
67
76
77 Wire1.begin();
78
79 if (myGNSS.begin(Wire1) == false)
80 {
81 Serial.println(F(“u-blox GNSS not detected at default I2C address. Please check wiring. Freezing.”));
82 while (1);
83 }
84
85 Serial.println(“GPS initialized.”);
86
87 myGNSS.setI2COutput(COM_TYPE_UBX | COM_TYPE_NMEA); //Set the I2C port to output both NMEA and UBX messages
88 myGNSS.saveConfigSelective(VAL_CFG_SUBSEC_IOPORT); //Save (only) the communications port settings to flash and BBR
89
102 delay(3000);
103 if (!SD.begin(10)) {
104 Serial.println(“SD card initialization failed!”);
105 while (1);
106 }
107 Serial.println(“SD card initialized.”);
108
109 myFile = SD.open(“GPS_data.txt”,FILE_WRITE);
115 }
119
120 void loop () {
121
127 if (millis() - lastTime > 1000)
128 {
129 lastTime = millis(); //Update the timer
130
131 // Seems GPS seconds need to be adjusted slightly by the time it gets to the RTC adjustment.
132 mySecond = myGNSS.getSecond() - 1;
133 myMinute = myGNSS.getMinute();
134 myMonth = myGNSS.getMonth();
135 myYear = myGNSS.getYear();
136
137 // Timezone adjustment, -8 hours
138 if (myGNSS.getHour() < 8) {
139 myHour = myGNSS.getHour() + 12 -8;
140 myDay = myGNSS.getDay() -1;
141 } else {
142 myHour = myGNSS.getHour() -8;
143 myDay = myGNSS.getDay();
144 }
149
151 if (rtc.begin()) {
152 // RTC connected.
153 // Under this condition the code should just be writing GPS date & time to the RTC.
154 Serial.println(“RTC connected, updating with GPS date & time…”);
155 rtc.adjust(DateTime(myYear, myMonth, myDay, myHour, myMinute, mySecond));
156 Serial.flush();
157 } else {
158 // RTC not connected.
159 // Under this condition the code should just be writing GPS data to the SD card.
160 Serial.println(“RTC not connected, writing GPS data to SD card…”);
161 }
196
197 myFile.print(“GPS: ,”);
198 myFile.print(myYear);
199 myFile.print(‘/’);
200 myFile.print(myMonth);
201 myFile.print(‘/’);
202 myFile.print(myDay);
203 myFile.print(“,”);
204 myFile.print(myHour);
205 myFile.print(‘:’);
206 myFile.print(myMinute);
207 myFile.print(‘:’);
208 myFile.print(myGNSS.getSecond());
209 myFile.print(“,”);
210
211 myFile.print(myGNSS.getLatitude() / 10000000., 7);
212 myFile.print(“,”);
213 myFile.print(myGNSS.getLongitude() / 10000000., 7);
214 myFile.print(“,”);
215 myFile.print(myGNSS.getGroundSpeed());
216 myFile.print(“,”);
217 myFile.print(myGNSS.getHeading());
218 myFile.print(“,”);
219 myFile.print(myGNSS.getFixType());
220 myFile.println();
222
225 myFile.flush();
229
230 }
231 }