esp32 and m8u dead reckoning not working

[joeholdsworth]

Subject of the issue

in i2c mode the m8u dead reckoning never calibrates, if I use it in uart mode with ublox center it does. Some I2C requests occasionally do not work.

Your workbench

• What development board or microcontroller are you using - ESP32
• What version of hardware or breakout board are you using - sparkfun neo m8u
• How is the breakout board wired to your microcontroller - I2C lines, 3.3v supply capable of 300mA
• How is everything being powered - via an LDO 3.3v 300mA reg
• Are there any additional details that may help us help you - id like to perform a check that the DR mode is enabled, is there a command for this?

Steps to reproduce

Tell us how to reproduce this issue. Please post stripped down example code demonstrating your issue.

I'm using the sparkfun examples provided, specifically the DR fusion calibration status, it never achieves calibration,if I perform the same vehicle maneuvers in uart mode and use the esp32 as a serial to usb bridge with the ublox center, it does.

Expected behavior

fusion calibration staus should indicate calibrated

Actual behavior

unit never calibrates

[Daedaliss10]

removing comment and starting separate issue

[PaulZC]

Hi @joeholdsworth ,

Apologies for the very slow reply - this fell off my radar...

Are you having the same issue as this one?

Best wishes,

Paul

[PaulZC]

Hi @joeholdsworth ,
Thank you for your patience!
It has taken a while, but I think we have found the root cause of this issue. There was a gremlin in the code that meant the calibration status wasn't being extracted correctly. The correction is here:
04d8f4a#diff-56e995c8ccf5d6b3bc269a8eaf038164594becf0f1c2df99616a0cd4f803c028R4098
The changes are still in the release_candidate branch, but I hope to be able to merge them into a new release in a day or two.
Thanks again for reporting this.
Best wishes,
Paul