How to get the GPS data in EM7455 Module?


#1

Hi

I have been evaluating the EM7455 module using the AirPrime EM series PCIe Development kit in Ubuntu 16.04.
When I connect the device to my Ubuntu system I see three com port named ttyUSB0 , ttyUSB1, ttyUSB2.
I was able to connect to the mobile broadband, also able to give AT commands in ttyUSB2 and get responses.
But i’m unable to get the GPS data from any of the ports ttyUSBx.

The AT commands I used are

AT+GMR

SWI9X30C_02.24.05.06 r7040 CARMD-EV-FRMWR2 2017/05/19 06:23:09

OK

AT!CUSTOM?

!CUSTOM:
GPSENABLE 0x01
GPSSEL 0x01
IPV6ENABLE 0x01
UIM2ENABLE 0x01
SIMLPM 0x01
USBSERIALENABLE 0x01
SINGLEAPNSWITCH 0x01

OK

AT!ENTERCND=“A710”

OK

AT!CUSTOM=“GPSENABLE”,1

OK

AT!GPSTRACK=1,180,50,50,1

OK

AT!GPSSTATUS?

Current time: 2018 08 03 4 11:03:25

2018 08 03 4 11:03:25 Last Fix Status = NONE
2018 08 03 4 11:03:13 Fix Session Status = ACTIVE

No TTFF available

OK

AT!GPSLOC?

Not Available

OK

I have also tested these sequence in open sky environment, but the results are the same.
So can anyone suggest me the correct procedure to get the GPS data from the module?

Thanks.


#2

Good morning sitharthan,

Have you taken a look at AT!GPSSATINFO? to see if there is any satellite info? Also, have you got an correct antenna connected?

Regards,
Tyrone


#3

Hi Tyrone

Thank you for your reply.
Yeah I am able to get some satellite details in COM port 1. And I think that I have connected my GPS antenna at the correct place. I have attached the satellite data details taken through Com port 1.

I have also attached the photo of my set for the antenna connection reference.

Thanks
Sitharthan R


#4

Good afternoon Sitharthan,

I note that from your module setup in the response to AT!CUSTOM that you’re selecting the shared antenna port for your GNSS/GPS antenna. I suggest one of two options:

  1. Move your antenna to the shared RF port (AUX)
  2. Change the config of the module to specify the dedicated GNSS RF port.
    2.1. AT!ENTERCND=“A710”
    2.2. AT!CUSTOM=“GPSSEL”,0
    2.3. AT!RESET

Also, depending on your antenna being active or passive, take a look at AT+WANT.

Regards,
Tyrone