WP7502 GPS - no TTFF available[solved]


#1

Hi,

I am working with GPS on WP7502 module in custom board. I am not able to get location values. Below are the outputs of AT!CUSTOM and AT!GPSSTATUS commands.

!CUSTOM:
ISVOICEN 0x01
GPIOSARENABLE 0x01
GPSENABLE 0x01
WAKEHOSTEN 0x83
NMEAENABLE 0x01
GOBIIMEN 0x01
USBECMRNDISOPTION 0x01
HSICENABLE 0x01
SINGLEAPNSWITCH 0x01
SIMLPM 0x01
BOOTQUIETDISABLE 0x01
FASTBOOTEN 0x01

OK

Current time: 1980 01 06 6 00:40:23

1980 01 06 6 00:40:23 Last Fix Status = NONE
1980 01 06 6 00:40:23 Fix Session Status = NONE

No TTFF available

OK

Looks like gps is enabled. Let me know if I am missing any other settings to solve the problem.

Thanks,
Hari.


#2

Hi,
You need to issue the AT!GPSAUTOSTART command.
e.g. at!gpsautostart=1,1,254,1,60


#3

Thanks Habib. Previously I have given at!gpsautostart=1,1,254,1,1000. After changing to at!gpsautostart=1,1,254,1,60, I got

Current time: 1980 01 06 6 00:04:22

1980 01 06 6 00:04:22 Last Fix Status = NONE
1980 01 06 6 00:00:09 Fix Session Status = ACTIVE

And after sometime I got
Current time: 1980 01 06 6 00:13:17

1980 01 06 6 00:04:23 Last Fix Status = FAIL, FAILCODE = 12
1980 01 06 6 00:04:23 Fix Session Status = ACTIVE

Will look into this.

Regards,
Hari


#4

Hi Hari,
Now your Session Status is ACTIVE. You can check your SAT info using at!gpssatinfo?
You need to have at least 3 satellites in view.


#5

Hi Habib,

Yes I got satellites and location also. Thank you.