Max M10S andd u-box GNSS V3

Pitchuk · August 2, 2024, 6:01am

Hi
I have an issue with my Max M10S connected over I2C.
I believe it maybe an issue with the library and have posted it I2C held up for over 1sec · Issue #62 · sparkfun/SparkFun_u-blox_GNSS_v3 · GitHub

Basically the first function of the library I call takes over 1000ms holding up the I2C and stalling the processor for this time.

All subsequent library functions run in 0ms untill the loop is re-run.

As such all other processes are preventing screen refresh and other bits of my code. I would appreciate if someone could help

PaulZC · August 2, 2024, 8:46am

Hi David,

Please see my reply on GitHub for the answer:

github.com/sparkfun/SparkFun_u-blox_GNSS_v3

I2C held up for over 1sec

opened 09:43PM - 01 Aug 24 UTC

closed 07:57AM - 02 Aug 24 UTC

pitchuk

Hi There, I have a SparkFun MAX-M10S wired via i2c to a Pi Pico running earleph…ilhower core 3.9.4. I am using different I2C lines but confirm this works with all other devices on the circuit. However when I run my code to get data, the first function (normally myGNSS.getPVT(), but seems to be any function) will take over 1 second to return anything. After which all remaining commands will take 0ms. It is preventing access to the I2C lines and stalling the processor for too long, preventing button recognition and screen refresh. Making device very laggy. I have simplified my code as show below, my serial output come back as: 1010 0 1006 0 1005 0 1006 0 1004 0 Got Fix 904 0 Got Fix 906 0 Got Fix 1010 0 Showing that both with and without satellite fix the first poll of the Max10S takes ~1000ms and rest of functions take 0ms ``` #include <Wire.h> //Needed for I2C to GNSS #include <SparkFun_u-blox_GNSS_v3.h> //http://librarymanager/All#SparkFun_u-blox_GNSS_v3 SFE_UBLOX_GNSS myGNSS; long lastTime1 = 0; //Simple local timer. Limits amount if I2C traffic to u-blox module. long lastTime2 = 0; long now = 0; int32_t latitudeTX; int32_t longitudeTX; int min_check; int Broadcast_Int = 2; //has to be greater than number oof nodes int t_sec; int t_min; int t_hour; int fixType; void setup() { Serial.begin(115200); Serial.println("SparkFun u-blox Example"); delay(2); Wire.setClock(400000); Wire.begin(); if (myGNSS.begin() == false) //Connect to the u-blox module using Wire port { Serial.println(F("u-blox GNSS not detected at default I2C address. Please check wiring. Freezing.")); while (1) ; } myGNSS.setI2COutput(COM_TYPE_UBX); //Set the I2C port to output UBX only (turn off NMEA noise) //myGNSS.saveConfiguration(); //Optional: Save the current settings to flash and BBR } void loop() { lastTime1 = millis(); if (myGNSS.getPVT() == true) { lastTime2 = millis(); if (myGNSS.getTimeValid()) { t_hour = myGNSS.getHour(); t_min = myGNSS.getMinute(); fixType = myGNSS.getFixType(); if (fixType == 5) { fixType = 0; } if (fixType >= 2) { latitudeTX = myGNSS.getLatitude(); longitudeTX = myGNSS.getLongitude(); } } } now = millis(); if (fixType >= 2) { Serial.print("Got Fix "); //print if we get a sat fix } long change = now - lastTime1; Serial.print(change); //Time in millis of every GPS command Serial.print(" "); change = now - lastTime2; Serial.println(change);//Time in millis of every GPS command besides first one delay(3000); } ```

Best wishes,
Paul

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Max M10S andd u-box GNSS V3

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