ublox M8N GPS - doesn't store settings - Discussions

Replies

Arshish Maneckji February 23, 2016 at 1:39am

I had the same problem guys with my M8N Drotek GPS. Settings I manually changed never persisted even after writing them to flash.

The workaround I found that fixed this was to upload the configuration file provided in the WIKI.

http://copter.ardupilot.com/wiki/common-ublox-gps/#installing_and_u...

Despite this, the baud rate still reverts back to 9600 whenever i connect to UCenter however the rest of the parameters seem to stick.

Hope this helps.
- Paul Meier > Arshish Maneckji February 23, 2016 at 2:09am
  
  Hi Arshish,
  
  I also have a drotek gps but I do not have problems.
  
  In UCenter after you have finished your settings in Configuration go to the CFG (Configuration) tab select as per image below and click send. Let me know if it solves your problem
  
  Screenshot (20).png
  
  https://storage.ning.com/topology/rest/1.0/file/get/3702620178?profile=original
  - Arshish Maneckji > Paul Meier February 23, 2016 at 2:15am
    
    Thanks Paul.. Ill try try this today.
Yakup HELVACI November 9, 2015 at 10:53am

If pixhawk uses same configuration on wiki page (link) , gps doesnt accept some commands on that config file. You have to do it manually with u-center.

I explained here
Todd Hill November 8, 2015 at 3:04pm

I am beginning to think we are just victims of cheap Chinese M8N knock-offs. According to Ublox they are all supposed to be "future proof", with built in internal flash like G+J Noci have already stipulated. However, when I have tried to reflash some of my Chinese modules the settings just aren't there upon reboot. I know that it is not my FTDI, as I am able to reflash some of my more expensive Modules. I am beginning to think it is in the knock-off chip design itself.

I did notice that when the modules in question were plugged in for the first time they worked, but if I left them plugged in during a firmware update they would become nonfunctional. Refresh rate on all of them would be at 1Hz after update. Maybe someone with better knowledge of these board layouts will have a better idea of just what is going on. I haven't looked any further into it myself, but now that I see that it is not just me I will look more into it.
Michael Utz November 8, 2015 at 12:24am

any solution ? facing the same problem.....
- Gabor H > Michael Utz November 8, 2015 at 1:13am
  
  Solution for the moment, to solder a switch to the TX cable coming out from Pixhawk. This way you can enable/disble programming.
  
  Or wait till GPS parameters owerwrite can be enabled/disabled from upcoming version of MissionPlanner.
Developer

Jani Hirvinen November 4, 2015 at 4:23pm

Many of Chinese made M8N GPSes are not using memorychip to store settings. M8N chip cannot store settings inside main chip.
- Gabor H > Jani Hirvinen November 5, 2015 at 12:39am
  
  If this is the case, then what's the purpose of the tiny battery on the PCB?
  - Developer
    
    Jani Hirvinen > Gabor H November 5, 2015 at 12:54am
    
    To keep the navigation map and last "online" location alive inside gps chip. If you look all jDrones or 3RD uBlox based GPSes. We have external flash memory to store settings.

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