Dataflash log format

ArduCopter
1

Hello Everyone

I’ve been looking for a definition of the Dataflash log format
Does someone has a link for that ?
I found this only : http://ardupilot.org/copter/docs/common-downloading-and-analyzing-data-logs-in-mission-planner.html#message-details-copter-specific
Which isn’t enough to parse the data
The most detailed I found so far is in dronekit repo
https://github.com/dronekit/dronekit-la/blob/master/DataFlash/LogMessage.h
But I would like to work from an official source if possible
I’de like to avoid diving in Mission Planner code. If no choice, I’m interested in a link or 2

Thanks in advance
Bastien

1 Like
2

mavlogdump.py converts logs to various formats (csv, json). Probably an easier piece of code to dive into than MP.

3

Thanks Anthony
Does that mean that log in Ardupilot is in Mavlink ?
I’m talking here about the so called “Dataflash log”

4

mavlogdump.py works on DF logs. short example:

$ mavlogdump.py logs/00000330.BIN --types FMT
2019-04-26 04:55:03.14: FMT {Type : 128, Length : 89, Name : FMT, Format : BBnNZ, Columns : Type,Length,Name,Format,Columns}
2019-04-26 04:55:03.14: FMT {Type : 216, Length : 76, Name : UNIT, Format : QbZ, Columns : TimeUS,Id,Label}
2019-04-26 04:55:03.14: FMT {Type : 215, Length : 44, Name : FMTU, Format : QBNN, Columns : TimeUS,FmtType,UnitIds,MultIds}
1 Like
5

Ok, thanks Mark
So no official doc, I gonna have to reverse engineer the protocol ?
Kinda a weak…
Is there a name for this binary log protocol ?

6

It has its origin in sdlog2 from the PX4 project. The format is “self describing” so I guess it needs no name :slight_smile:

7

Héhé, the Self-Described-No-Named Protocol
Thanks for the anecdote, I’ll start from mavlogdump.py

8

take a look at DFreader.py in