OESF Portables Forum

Everything Else => General Support and Discussion => Zaurus General Forums => Archived Forums => Software => Topic started by: samxiao on July 15, 2005, 03:23:15 pm

Title: Qpegps Problem
Post by: samxiao on July 15, 2005, 03:23:15 pm

i bought an Ambicom GPS-CF
and i tried to use it on my C1000
i installed qpeGPS and i download the maps already in png format
i also set it to /dev/ttyS3
the connection between Z and GPS-CF seems working

but i cannot get any location from the GPS

cat /dev/ttyS3 i got this:

Quote

# cat /dev/ttyS3
,50.0,0.0,M,,M,,0000*42
$GPGSA,A,1,,,,,,,,,,,,,50.0,50.0,50.0*05
$GPRMC,000100.995,V,36000.0000,N,72000.0000,E,,,270102,,*26
$GPGGA,000101.995,36000.0000,N,72000.0000,E,0,00,50.0,0.0,M,,M,,0000*43
$GPGSA,A,1,,,,,,,,,,,,,50.0,50.0,50.0*05
$GPGSV,1,1,01,16,00,000,*4F
$GPRMC,000101.995,V,36000.0000,N,72000.0000,E,,,270102,,*27
$GPGGA,000102.995,36000.0000,N,72000.0000,E,0,00,50.0,0.0,M,,M,,0000*40
$GPGSA,A,1,,,,,,,,,,,,,50.0,50.0,50.0*05
$GPRMC,000102.995,V,36000.0000,N,72000.0000,E,,,270102,,*24
$GPGGA,000103.995,36000.0000,N,72000.0000,E,0,00,50.0,0.0,M,,M,,0000*41
$GPGSA,A,1,,,,,,,,,,,,,50.0,50.0,50.0*05
$GPRMC,000103.995,V,36000.0000,N,72000.0000,E,,,270102,,*25
$GPGGA,000104.995,36000.0000,N,72000.0000,E,0,00,50.0,0.0,M,,M,,0000*46
$GPGSA,A,1,,,,,,,,,,,,,50.0,50.0,50.0*05
$GPRMC,000104.995,V,36000.0000,N,72000.0000,E,,,270102,,*22

what seems to be wrong?
can anyone give me direction?

i'm using Cacko 1.23

Title: Qpegps Problem
Post by: suid on July 17, 2005, 07:42:59 am

As you say, there doesn't appear to be any problem with comms between the Zaurus and GPS device, because you're picking up NMEA data on ttyS3. However, the NMEA data is showing that you are not picking up any satellites.

If this is the first time you've used the Ambicom, it can take a while to get a fixed position. I suggest keep trying for half an hour and make sure you're in an open space with no obstructions.

I've also experienced this "no fix" problem on my Z in the past and found that restarting gpsd will fix it :

$ killall gpsd

... then restart it from within qpeGPS.

As a last resort, see if you can get the Ambicom running with another portable device.

Ian

Title: Qpegps Problem
Post by: lardman on July 17, 2005, 11:34:50 am

Quote

$GPGSV,1,1,01,16,00,000,*4F

It can only see one satellite - #16 (see this doc to do some more decoding: http://vancouver-webpages.com/peter/nmeafaq.txt) (http://vancouver-webpages.com/peter/nmeafaq.txt))

I'd leave gpds be as it appears to be working - as suid says, put your Z (outside) somewhere with a good field of view (middle of a cricket pitch would be ideal  ) and wait for it to decide where it is - after that it should find itself far more quickly (assuming it behaves the same as other GPS units anyway).


Si

Title: Qpegps Problem
Post by: samxiao on July 17, 2005, 11:42:10 am

thanks guys
i will try it

because this is the first time i use any CF-like GPS device
so i guess i need to work on it for sometimes
it's raining today
maybe i try it tomorrow
thanks

Title: Qpegps Problem
Post by: samxiao on July 18, 2005, 11:53:09 am

i tried
works
but qpeGPS is not practical for driving in a car

anyone has other good suggestion?