Re: [Paparazzi-devel] PPZ GPS board and U-Blox LEA-6 - cannot save configuration

[Felix Ruess]

Hi,

I never had any problems with the ublox4 and 5 on the ppz gps board,
but I don't have a ublox6 yet...
You can also use the ucenter module to configure the gps on startup of
the autopilot:  http://paparazzi.enac.fr/wiki/Module/GPS_UBlox_UCenter

Cheers, Felix

On Mon, Dec 5, 2011 at 1:21 PM, Greg Jones
<address@hidden> wrote:
> I should add that even if the GPS is power cycled within a few seconds – the
> configuration is “lost” and the device reverts to a Safeboot looking only at
> the ROM and the factory settings – even though in theory there is enough
> power to retain settings during that period.
>
>
>
> thanks
>
>
>
> From: Greg Jones
> Sent: 05 December 2011 12:13
> To: address@hidden
> Subject: Re: [Paparazzi-devel] PPZ GPS board and U-Blox LEA-6 - cannot save
> configuration
>
>
>
>>have you checked if the big capacitor on the board "P11070CT-NDÂ " is
>> functioning normally?
>
>>Regards,
>
>>
>>Imed LIMAIEM
>
> Hi Imed
>
>
>
> I measure approx. 2.55 V across that cap and 1 minute after power done it
> measures 1.2 V.  So the voltage into the V_BCKUP pin of the LEA-6H falls to
> under 1.4 V within about 45 seconds. According to the U-Blox datasheet this
> should be between 1.4 V and 3.6 V which is a slightly wider than for the
> LEA-5H (1.5 – 3.6 V) but the datasheet does mention higher current
> requirements. Surely this means that the cap is providing nothing other than
> protection against very brief losses of power? Maybe I have misunderstood
> something there. Or maybe the LEA-6H does draw significantly more current
> against the battery backup.
>
>
>
> BUT in any case, the configuration should be written to flash memory in the
> LEA-6H as well as just BBR as it is with the LEA-5H. Since it should be
> getting written to flash then the BBR is not necessary for holding
> configuration.
>
>
>
> The LEA-6H is reading it’s firmware and configuration from ROM only as can
> be confirmed by examining the UBlox message UBX>MON>HW2 where we see that
> the value for “Source of low level configuration” is ROM.
>
>
>
> Also I have now since “successfully” flashed the LEA-6H with the new U-Blox
> firmware 7.03, no errors were reported during the firmware upgrade process
> which I have repeated a couple of times. But still when power cycled the
> unit ignores the updated firmware held in flash and boots using the original
> 6.02 firmware and default configuration which is held in the LEA-6H ROM.
>
>
>
> I get the feeling that it is storing both the config and the new firmware in
> the Flash but that the flash is being ignored at start-up because of the
> “Safeboot” mode which is forcing the Ublox to read both config and firmware
> from ROM only.
>
>
>
> I suppose this leads to two questions:
>
>
>
> 1)      Should the U-Blox modules when on a PPZ GPS board be capable of
> storing configuration in flash (I think they should)
>
> 2)      Why is the LEA-6H when on a PPZ GPS board only booting from ROM and
> ignoring it’s flash memory holding the firmware and config?
>
>
>
> Thanks
>
>
>
>
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