[Gta04-owner] New hw-validation snapshot

Dr. H. Nikolaus Schaller hns at goldelico.com
Sat Nov 19 18:34:42 CET 2011


Hi Boudewijn,

> It's been watching the garden for most of the afternoon now, running the HW validation image and off the Openmoko powersupply:
> 
> gta04:~# date
> Sat Nov 19 14:30:23 UTC 2011
> gta04:~# cat /dev/ttyS1|grep GPRMC
> $GPRMC,043012.032,V,,,,,,,130806,,,N*44
> $GPRMC,043013.046,V,,,,,,,130806,,,N*46
> $GPRMC,043014.032,V,,,,,,,130806,,,N*42
> ^C
> gta04:~# cat /dev/ttyS1|grep GPGGA
> $GPGGA,043020.032,,,,,0,00,,,M,0.0,M,,0000*52
> $GPGGA,043021.032,,,,,0,00,,,M,0.0,M,,0000*53
> $GPGGA,043022.042,,,,,0,00,,,M,0.0,M,,0000*57
> $GPGGA,043023.032,,,,,0,00,,,M,0.0,M,,0000*51
> ^C
> gta04:~# cat /dev/ttyS1|grep GPGSV
> $GPGSV,3,1,12,20,00,000,,10,00,000,,25,00,000,,27,00,000,*79
> $GPGSV,3,2,12,19,00,000,,07,00,000,,04,00,000,,24,00,000,*76
> $GPGSV,3,3,12,16,00,000,,28,00,000,,26,00,000,,29,00,000,*78
> $GPGSV,3,1,12,20,00,000,,10,00,000,,25,00,000,,27,00,000,*79
> ^C
> gta04:~# date
> Sat Nov 19 14:30:55 UTC 2011
> 
> Too bad, but not totally unexpected :-(
> 
> I have an external antenna, but not with the right connector. Only the amplifier needs power, not the antenna, wasn't it? So there's nothing to measure at the external connector to see if it got (enough) power.

many thanks for the report!

I did a comparison with the old BeagleBoard Hybrid prototype
which did rapidly see some satellites, although it had been
collecting dust for quite a while :)

The main difference is that the BB Hybrid operates the antennae
with a higher voltage than we have programmed through the
new hw-validation kernel patch. Another difference is the board
layout and that it uses a BeagleBoard C4 (with a 600MHz OMAP3).
So the self-generated noise may be different.

Then, I did measure some voltages in the antenna switch circuit
and it appears that the antenna switch circuit (we simply have
copied from the GTA02) is not working properly, although it
toggles the GPIO to indicate the external antenna.

This could explain some of the problems we see and where
the unexpected ear protector is sitting (the antenna switch),
but not yet the real reason or a cure.

BR,
Nikolaus
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