Steven Saner <[email protected]> writes: > Hi: > > I flew my Telemetrum v1.2 system today with the Altus Droid connected to > the Teledongle via USB. > > The flight was good. Went to 6887ft and only had about 1/4 mile to walk > for recovery. > > A couple issues though. > > The altimeter did not record the entire flight in the flash memory. Only > the first 75 sec of the flight was recorded. The entire flight time was > several minutes. When I go to save the flight data using the AltOS > application on a computer the download errors out with: > > "Flight 8 download error invalid checksum at 0x100000 Valid log data > saved". > > So, this kind of makes sense because I had the Max Flight Log Size set > to 992 (2 flights). So, if I understand right, it would use only the 1st > MB of the 2MB storage for the flight (no other recorded flights). And > 0x100000 is the 1MB location where the data probably just ends.
1MB should be able to store about 40 minutes of flight data, so there's
something amiss here.
Can you send whatever log file you've managed to save to me so I can
take a look at it?
> But at this point in time I can find no way to actually delete that
> flight from the altimeter and also the Maximum Flight Log Size selection
> in the Configuration panel is greyed out and disabled. I don't remember
> for sure, but does the UI normally give the option to delete after you
> have downloaded? Since it is erroring out, I'm not getting that
> option.
You can resize only if there aren't any flights still saved on the device.
> What am I missing here? Do I understand the cause of the problem
> correctly, or should I be at all worried about a flash failure?
I'd suspect some kind of firmware bug frankly. 75 seconds of flight
time, of which presumably 60 were probably descent would yield a log
file of:
15 seconds ascent * 100 samples per second * 8 bytes per sample
60 seconds descent * 10 samples per second * 8 bytes per sample
16800 bytes of flight log.
> The second issue is that during the recovery phase, the Altus Droid
> application as it was giving me the voice updates kept saying "Speed
> 0.0" and never anything different than that. So first question is, is
> that supposed to be vertical speed or horizontal speed?
We only report vertical speed so that you can verify if the recovery
system has deployed as expected.
> Lastly, I know that the Altus Droid saves the telemetry data to the
> Android file system. Is there any way to then get the droid app to load
> one of those files and replay it like you can with the AltOS computer
> app? Or at least get the flight stats? I would find it useful at times
> to be able to load one of those files on the phone and at least see what
> the basic flight stats were.
You can take the telemetry file from the AltosDroid app and replay it on
your computer. AltosDroid isn't that fancy (yet).
Please send along your log file and let me see if that has a story to
tell; if there's a firmware problem, I may be able to use that to
reproduce it on the ground too.
--
-keith
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