Fails to initialise

[StressedDave]

Subject of the issue

myGNSS.begin() returns false

Your workbench

Using Arduino v2.2.1 & CLI 0.34.0

Behaviour has been confirmed on both Sparkfun NEO-M8U & NEO-M9N boards Behaviour confirmed with Adafruit Feather boards (M0, M4 and RP2040) & QtPy (ESP32 C3)

Device (Adafruit Feather STM32F403) using older version of library (last compiled several months ago) works correctly with both GPS boards

Device scan confirms that boards are connected

Steps to reproduce

Tested on large number of library examples, including Example8_GetProtocolVersion

Expected behavior

Expected to work as standard example

Actual behavior

Device outputs "u-blox GNSS not detected at default I2C address. Please check wiring. Freezing." via serial port. Debug output shows (x3):

Sending: CLS:CFG ID:0x0 Len: 0x1 Payload: 0
sendCommand: Waiting for ACK response
checkUbloxI2C: Reading 28 bytes
checkUbloxI2C: OK, zero bytes available
checkUbloxI2C: Reading 28 bytes
checkUbloxI2C: OK, zero bytes available
checkUbloxI2C: Reading 28 bytes
checkUbloxI2C: OK, zero bytes available
checkUbloxI2C: Reading 28 bytes
checkUbloxI2C: OK, zero bytes available
checkUbloxI2C: Reading 100 bytes
checkUbloxI2C: OK, zero bytes available
checkUbloxI2C: Reading 28 bytes
checkUbloxI2C: OK, zero bytes available
checkUbloxI2C: Reading 28 bytes
checkUbloxI2C: OK, zero bytes available
checkUbloxI2C: Reading 28 bytes
checkUbloxI2C: OK, zero bytes available
checkUbloxI2C: Reading 28 bytes
checkUbloxI2C: OK, zero bytes available
checkUbloxI2C: Reading 56 bytes
checkUbloxI2C: OK, zero bytes available
checkUbloxI2C: Reading 28 bytes
checkUbloxI2C: OK, zero bytes available
waitForACKResponse: TIMEOUT after 1100 msec.

[PaulZC]

Hi,

I can't replicate your issue...

I've just tried Example8 on an Adafruit SAMD21 M0 (Adalogger) connected to a NEO-M8U breakout via I2C and everything is working fine.

I'm using: Arduino IDE 1.8.19; Adafruit SAMD boards 1.7.13; this library v2.2.24.

Are you sure you are using this library - v2.2.24? Or are you perhaps trying to use v3 of the library? (Your comment about "using older version of library" hints that you may be using v3?)

Best, Paul

[PaulZC]

Humm... From the "Sending: CLS:CFG ID:0x0", it looks like you are indeed using this library. That is the CFG-PRT check used by v2 of the library, not v3.

Just tried Arduino IDE 2.2.1 and again it's working fine for me:

All I can suggest is that you check your I2C cable and make sure you are connecting to the correct SCL / SDA pins?

Closing - because I can't replicate your issue. Please re-open if you think I've missed something.

Best wishes, Paul

[StressedDave]

Weird - I didn't have the v3 library on my system. A quick install of v3, deinstall of v3 & v2 and then reinstall v2 and it's happy now.

I'm blaming the Arduino library manager...

Thanks for checking for me.

[PaulZC]

No worries - glad it's working for you, Paul