Ardupilog - A DataFlash log to MATLAB converter

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New Dataflash logs include additional messages encapsulating field units and multipliers.
With https://github.com/Georacer/ardupilog/pull/77 now Ardupilog can store this information within each logMsgGroup, on the fieldUnits.<fieldName> and fieldMultipliers.<fieldName> attributes.

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I getting the following error messages

log = Ardupilog()
Undefined function or variable ‘LogMsgGroup’.

Error in Ardupilog/createLogMsgGroups (line 315)
new_msg_group = LogMsgGroup(newType, newName, newLen, newFmt, newLabels);

Error in Ardupilog/readLog (line 134)
obj.createLogMsgGroups(data’);

Error in Ardupilog (line 68)
readLog(obj);

Any help would be appreciated

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Hi,

Can you provide me with the log you are trying to read?
I’m not getting any errors with the current master on my logs.

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Thanks George. File attached.

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Err, are you sure? I don’t see a link or attachment anywhere…

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Hi, II have noticed that the data flash logs in newer 3.9 7 above base ardupliot are not being read by Matlab. This is the error:
Error using Ardupilog/addprop
‘FMT’ is already defined as a property.

Error in Ardupilog/createLogMsgGroups (line 320)
addprop(obj, newName);

Error in Ardupilog/readLog (line 134)
obj.createLogMsgGroups(data’);

Error in Ardupilog (line 68)
readLog(obj);

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Thanks for bringing this up. Can you provide me with a log, so that I can test and fix?

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Hi George,

Thanks for the response. I have uploaded a sample log: https://www.dropbox.com/t/YUf3uycJNNVZCYnA

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@Georacer : Were you able to download the file?

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Yes, 1.7MB. I’ll look into it.

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Hm… I’m getting a different error:

In an assignment  A(:) = B, the number of elements in A and B must be the same.

Error in Ardupilog/buildMsgUnitFormats (line 374)
                multValues(unitIdx) = multValue;

Error in Ardupilog/readLog (line 184)
            obj.buildMsgUnitFormats();

Error in Ardupilog (line 68)
        readLog(obj);

I’ll check it nonetheless, but can you make sure what error you get with the log you sent me?

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FYI, started an issue here, because it looks a bit perplexing and the discussion might take long: https://github.com/Georacer/ardupilog/issues/79

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This is super awesome. I’m using it for a GUI application for flight analysis.

EDIT: Is there a way to create empty Ardupilog structs to manipulate multiple sets of logs? I’d like to create a drop down menu with different logs. I want to define it as a public property.

Example:

plogs = [{ardupilog_1}, {ardupilog_2}, {ardupilog_3}, … {ardupilog_n}]

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Hm… I’m not sure I understand your end-goal and I foresee a lot of back and forth. Care you open an issue with a use-case example where we can talk more?

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Hi. I realize this is made for MATLAB, but have anyone made it work in Octave? I am attempting to do so but it seem to give up before I get prompted to input a file. As a former Matlab user I believe it is superior, but there are many reasons to use open source software, and Octave is not a bad alternative when it comes to that.

1 Like
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I haven’t tested against Octave, but I would suggest that you skip the file selector GUI by providing the filename directly: log = Ardupilog('/path/to/log').
It might give you better chances of working.

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Thank you for the tip. I tried, but get the same error.

>> log = Ardupilog('15.BIN')
parse error near line 83 of file C:\Users\torby\Downloads\ardupilog\Ardupilog.m
  syntax error
>>>                 for prop = properties(obj)'
                                        ^
>>

So it might be some small difference between Octave and Matlab I am not understanding.

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Ah, it seems that Octave does not have the same method for querying which are the attributes of a class. And I don’t know if it has that ability at all. Probably the API for introspection isn’t the same as Matlab’s.

I’m sorry, but I cannot help you further, as I don’t plan to support Octave too.

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I understand that, and I don’t expect support on software the code is not written to run on. Thanks for looking into it, that was helpful.

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Hi George, Thank you very much for your hard work!

I tried to run the matlab script to analyze my .bin file but get the following error :

Error using >
Matrix dimensions must agree.

Error in Ardupilog/findBootTimeUTC (line 507)
leapseconds = sum(recv_gps_datenum > leap_second_table);

Error in Ardupilog (line 74)
obj.findBootTimeUTC();

Error in test_log_matlab (line 1)
log = Ardupilog()

Also attached is the .bin file i’m trying to analyze. Is there a way to fix this issue? thank you very much

1 31-12-1969 19-00-00.bin (488 KB)