Time sync Rasp3 usb gps

Koen

Hi all!

Yesterday i did install the latest emteria OS. It works great! My plan is to use it stand alone without any wifi connection.
The problem is that de rasp pi3 will loose its tike. I have a clock module for the Pi but dont know how to install it on the OS. Somebody that knows if that will work? Otherwise is have a gnss usb receiver but tried it to connect it with https://github.com/freshollie/UsbGps4Droid . Enable mock service is a problem. I enabled the mock location trough developer option, but the gps4droid app will keep saying the mock location service is off. Do i something wrong?
Btw, can i use the usb gso receiver for time? Or will it not work whatever what?

Martin

Hi Koen, last two Emteria versions contain USB GPS driver with time-sync functionality, but this is GPS driver and I don't know if it works with GNSS receivers. Look at #53

BTW, Emteria is able to read USB GPS receivers by default, so you don't need any mock apps.

IKS

There are other discussions about RTC modules for Pi, which may be helpful for you. If you are able to read the time from GPS, you can go ahead and update the system time (either from a script or from an app).

Martin

Current version of USB GPS driver updates system time if property "ro.kernel.android.gps.time_sync" is set to some nonzero value (I recomend 20 or 30).

Koen

Hello All. Thank you for your support.
@ Martin. I can check your option by typing the command in terminal? Or how can i check this?

Martin

You must edit file build.prop probably located in the /system folder and reboot. Use total commander, for example.

Koen

HI Martin,
The line says: ro.kernel.android.gps=ttyACMO
What do i have to change in this line?

Martin

No, you should add new line:
ro.kernel.android.gps.time_sync=30

But at first, try if your receiver is compatible by some application, e.g. GPS Status.

Koen

Your Right. I add the new line, rebooted. When checking with gps status it keeps looking for GPS location. Strange.

Martin

So you could try to install and run "Serial USB Terminal" (https://play.google.com/store/apps/details?id=de.kai_morich.serial_usb_terminal&hl=en). In the menu, choose your attached USB receiver according to vendor and product IDs (google them for your device, e.g. http://www.linux-usb.org/usb.ids). As terminal type choose CDC. Touch "connect" and you should see received NMEA sentences. Copy and send them to this thread.

Martin

Sorry, I forgot to say - If you want to see anything in GPS Status, your device must see some satellites - it must be in the FIX state. Some buildings effectively prevent reception of the signal, so you can try to push the receiver out of the window.

Koen

Good Evening. I extracted this for gps serial:
19:57:06.493 $GPGSV,4,2,13,13,06,017,,15,12,048,22,16,52,195,22,18,15,245,2376
19:57:06.493 $GPGSV,4,3,13,20,53,092,41,21,31,067,32,26,27,178,33,27,76,298,2875
19:57:06.494 $GPGSV,4,4,13,30,09,332,184A
19:57:06.494 $GPGLL,5152.63069,N,00533.24180,E,231842.00,A,A64
19:57:07.492 $GPRMC,231843.00,A,5152.63072,N,00533.24174,E,0.147,,070219,,,A72
19:57:07.492 $GPVTG,,T,,M,0.147,N,0.272,K,A26
19:57:07.493 $GPGGA,231843.00,5152.63072,N,00533.24174,E,1,08,1.10,-4.9,M,46.1,M,,7A
19:57:07.493 $GPGSA,A,3,21,20,27,10,08,18,26,16,,,,,2.08,1.10,1.760F
19:57:07.493 $GPGSV,4,1,13,07,16,301,,08,42,293,21,10,49,139,24,11,02,263,2778
19:57:07.495 $GPGSV,4,2,13,13,06,017,,15,12,048,23,16,52,195,22,18,15,245,2377
19:57:07.496 $GPGSV,4,3,13,20,53,092,41,21,31,067,32,26,27,178,33,27,76,298,2875
19:57:07.496 $GPGSV,4,4,13,30,09,332,194B
19:57:07.496 $GPGLL,5152.63072,N,00533.24174,E,231843.00,A,A64
19:57:08.494 $GPRMC,231844.00,A,5152.63072,N,00533.24179,E,0.105,,070219,,,A7E
19:57:08.494 $GPVTG,,T,,M,0.105,N,0.194,K,A2B
19:57:08.496 $GPGGA,231844.00,5152.63072,N,00533.24179,E,1,08,1.10,-4.8,M,46.1,M,,71
19:57:08.497 $GPGSA,A,3,21,20,27,10,08,18,26,16,,,,,2.08,1.10,1.760F
19:57:08.499 $GPGSV,4,1,13,07,16,301,,08,42,293,21,10,49,139,24,11,02,263,2877
19:57:08.499 $GPGSV,4,2,13,13,06,017,,15,12,048,23,16,52,195,22,18,15,245,2377
19:57:08.500 $GPGSV,4,3,13,20,53,092,41,21,31,067,32,26,27,178,33,27,76,298,2875
19:57:08.500 $GPGSV,4,4,13,30,09,332,194B
19:57:08.500 $GPGLL,5152.63072,N,00533.24179,E,231844.00,A,A6E
19:57:09.491 $GPRMC,231845.00,A,5152.63073,N,00533.24178,E,0.043,,070219,,,A7C
19:57:09.492 $GPVTG,,T,,M,0.043,N,0.079,K,A2A
19:57:09.493 $GPGGA,231845.00,5152.63073,N,00533.24178,E,1,08,1.10,-4.9,M,46.1,M,,71
19:57:09.494 $GPGSA,A,3,21,20,27,10,08,18,26,16,,,,,2.08,1.10,1.760F
19:57:09.494 $GPGSV,4,1,13,07,16,301,,08,42,293,21,10,49,139,23,11,02,263,2870
19:57:09.495 $GPGSV,4,2,13,13,06,017,,15,12,048,23,16,52,195,22,18,15,245,2470
19:57:09.495 $GPGSV,4,3,13,20,53,092,41,21,31,067,32,26,27,178,33,27,76,298,2875
19:57:09.496 $GPGSV,4,4,13,30,09,332,194B
19:57:09.496 $GPGLL,5152.63073,N,00533.24178,E,231845.00,A,A6F
19:57:10.493 $GPRMC,231846.00,A,5152.63073,N,00533.24177,E,0.034,,070219,,,A70
19:57:10.494 $GPVTG,,T,,M,0.034,N,0.063,K,A21
19:57:10.494 $GPGGA,231846.00,5152.63073,N,00533.24177,E,1,08,1.10,-5.0,M,46.1,M,,75
19:57:10.494 $GPGSA,A,3,21,20,27,10,08,18,26,16,,,,,2.08,1.10,1.760F
19:57:10.496 $GPGSV,4,1,13,07,16,301,,08,42,293,21,10,49,139,23,11,02,263,2870
19:57:10.497 $GPGSV,4,2,13,13,06,017,,15,12,048,23,16,52,195,21,18,15,245,2374
19:57:10.499 $GPGSV,4,3,13,20,53,092,42,21,31,067,32,26,27,178,33,27,76,298,2876
19:57:10.499 $GPGSV,4,4,13,30,09,332,184A
19:57:10.499 $GPGLL,5152.63073,N,00533.24177,E,231846.00,A,A63
19:57:11.486 $GPRMC,231847.00,A,5152.63068,N,00533.24183,E,0.131,,070219,,,A74
19:57:11.486 $GPVTG,,T,,M,0.131,N,0.243,K,A25
19:57:11.488 $GPGGA,231847.00,5152.63068,N,00533.24183,E,1,08,1.10,-4.9,M,46.1,M,,7D
19:57:11.488 $GPGSA,A,3,21,20,27,10,08,18,26,16,,,,,2.08,1.10,1.760F
19:57:11.490 $GPGSV,4,1,13,07,16,301,,08,42,293,20,10,49,139,23,11,02,263,2871
19:57:11.491 $GPGSV,4,2,13,13,06,017,,15,12,048,23,16,52,195,22,18,15,245,2470
19:57:11.492 $GPGSV,4,3,13,20,53,092,42,21,31,067,32,26,27,178,33,27,76,298,2876
19:57:11.493 $GPGSV,4,4,13,30,09,332,194B

Looks like Gps to me?!

Koen

The device is a u-blox 7 usb receiver i found out. It is working with u-center windows 10.

Martin

Yes, your data are correct. If I send them to the current GPS driver then it works. There is only one small problem - your GPRMC sentences don't contain "Bearing" parameter but it couldn't be reason of your issue.

Have you turned on the Position in the settings? And How version of Emteria do you have?

Koen

Hi Martin, I installed emteria v0.6.2. with a personal licence.
Location in on. Mode Device only. GPS status has permission it says.

Martin

So this is very strange. So I see only two possibilities what could be wrong.
1) Measure rate management built in driver is not working properly on u-blox 7
2) Android core needs Bearing parameter

I would send you modified driver with deactivated MRM and fake bearing parameter. Copy it to /system/lib/hw and don't forget set owner and permissions to original values (same as other drivers in hw folder). And reboot device.

IKS

@Martin, it looks to me that we should start using the same repository for a better collaboration. I'll check if we can replace our own code by a direct link to https://github.com/kconger/android-serial-gps-driver, which would include your future updates automatically.

Martin

Hi @IKS, It would be great.

Hi @Koen, I forgot for third possible source of your problems. How many devices do you have connected to USB ports? It's possible that your GPS device have different name than ttyACM0. You can see all tty devices in e.g. Total commander in the /dev folder.

Koen

Hi Martin,
It is getting strange.
I did film the boot so i can playback what the boot was saying:
It found the Ublox 7 gps receiver. ACM0 cdc_acm 1-1.4:1.0
binder 164:164 transactoin failed 29189.
I changed the ACM to 1. Dont know why, and back to AMC0. Now the GPS status app is working. I can read the exact time from it.
Android is not using the time that is picked up by the receiver, so thats the only problem i think. Tried location High Accuracy, Battey savind and Device only. Time is on network provided.
We are getting there!

Koen

Martin.
I want to thank you for your great help. I just made a very stupid mistake. ro.kernal is not working;-) ro.kernel is better!
Many thanks!