TTconv

TTconv for TomTom Rider 2013 (also known as K4, v4, or v5) and TomTom units with GL1 (Global Locate Hammerhead) GPS chip by treysis (treysis@gmx.net)

DISCLAIMER: Use of this patch is at your own risk! While I don't see any way how this patch could cause harm to your device (e.g. there is nothing writing to flash all the time which would degrade flash memory over time) I take no responsibility!

What does it do?

After April 7, 2019 the Rider 2013 and devices with GL1 GPS chip (e.g. ONE 3rd) aren't able to display the correct time anymore and lose some functions because of this. The reason for this is the GPS Week Number Rollover Event (WNRO) which happens every 19.7 years. TTconv takes care of this.

Bugs?

This version seems to work fine as it is now. But I wanted to make it available for everyone as fast as possible, so it is still missing long time tests. USE AT YOUR OWN RISK! NO GUARANTEES FOR NOTHING (but it shouldn't be possible to break something the way it works and it can be completely reverted!). The code of the utility is [very(!) very(!!)] still a bit ugly(!!!). I haven't been coding in years. So it's possible that there will be some bugs.

1. Doesn't seem to work with some editions of NavCore 9.541, especially on devices with only 32 MB RAM. Use previous version!

2. Should work now also after standby! But shows wrong time for some seconds. If signal disappears or if it stops working, manual start by additional menu called "TTconv" is possible. Not sure if this is fixible, but seems to be just a minor inconvience if any at all. I haven't checked thoroughly how this might interfere with any logging, but so far it looked good.

3. I haven't tested it for long time. Maybe it will stop. Just restart as noted under 1. Many users reported no issues at all over thousands of kilometers, and other issues might also stem from reception issues.

4. I also haven't looked at CPU usage/battery drain. Please tell me if you find any unusual battery drain.

5. Won't work after the next WNRO Event on November 20, 2038. You'll be transported back to 2019. But the time should stay correct. But maybe the current GPS won't even be around anymore. Maybe I will provide a solution (it's already in my head), but for now this has to suffice!

6. Probably will catapult you 19.7 years into the future once TomTom releases an official update.

Installation?

Just unpack the archive to the main directory of the TomTom. It will then start automatically. In version v10 I adjusted the startup script to automatically start the additional tools "MiniLog" or "Height" by a user named "Joghurt", which many people have installed on their devices. The old icons from version v7 ("MiniLog Yes" and "MiniLog No") are not needed anymore and are not included in newer versions (delete the following files manually from folder "sdkregistry": minilogyes.cap, minilogyes.bmp, minilogno.cap, minilogno.bmp).

Advanced users: If you are using another tool that uses "ttn" for startup, you will have to overwrite the current "ttn" file when extracting or add this line (preferentially to the beginning) of "ttn":

/mnt/sdcard/fixdate/resetgps &

Uninstallation?

If you are not happy with the result or you encounter some serious bugs, the easiest way is to delete the "ttn" file. This will prevent my patch from starting and your TomTom should work as before (but with the broken time of course). If you want to clean up your device, just delete the files that came with this patch. But leaving them on the device will only occupy a few kilobyte and won't have any effect on the operation of the device.

Icons?

If you just don't like the menu icons you can delete them from the "sdkregistry" folder: ttconv.cap and ttconv.bmp.

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I hope this gives you many additional years of joy with the Rider 2013 and the other GL1 personal navigation devices by TomTom.

Also I have to stress that I am disappointed with TomTom. The Rider 2013 is still officially supported, and the fix was not so difficult (for me it was, because I was not used to coding anymore). Meanwhile, Garmin has published a fix for their 2009 model Zumo 660 (05-06-2019). On the other hand, fortunately TomTom provided the precompiled toolchain and uses Linux on the older devices which is the reason it was possible in the first place to fix it without further help (there was also a bit of luck involved in how every part of the system works together!).

Acknowledgements:

• Anuj Chauhan (and additions by Mithun Kumar, ayush2904) https://www.geeksforgeeks.org/date-after-adding-given-number-of-days-to-the-given-date/ for providing a routine to add a specific number of days to a given date.

• Devendra Aaru/MADMAX/https://gist.github.com/DevNaga's source: https://gist.github.com/DevNaga/fce8e166f4335fa777650493cb9246db for calculating NMEA0183 checksums

• Users at StackOverflow.com for answering my questions on named pipes, strings, pointers, and all the other stuff I couldn't figure out on my own.

• The crowd at digital-eliteboard.net and gpsurl.com for providing me the necessary resources for TomTom devices, testing, and valuable feedback, potentially (actually, not really) putting their devices at risk.

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Changelog:

v12 (07-05-2020):

• Open source release (GPLv3)

v11 (08-06-2019):

• minor code optimizations to ttconv
• added version information to ttconv

v10 (07-06-2019):

• rewrite of parsing NMEA sentences to be more universal and remove some mistakes while parsing certain sentences, optimization of memory usage
• fully automatic startup, no configuration for MiniLog neccessary anymore
• removed delays from scripts for faster startup time
• updated readme

v9 (29-05-2019):

• fixed memory leak in ttconv and cosmetic changes for rare NMEA sentences
• remove ResetGPS menu icon (only TTconv is left for now)

v8 (29-05-2019):

• fixed typo in resetgps and readme :)

v7 (29-05-2019):

• merged with patch for units with GL1 GPS chip
• added menu options to chose if you are MiniLog user or not
• updated readme

v6 (28-05-2019):

• added some sanity checks to ttconv and possibly prevent possible weird data points when recording tracks when GPS signal is lost (e.g. passing through a tunnel)
• preparation for merging with patch for GL1 devices

v5 (27-05-2019):

• updated/fixed readme, removed v? from file (annoying to update :) )

v4 (27-05-2019):

• should work now for non-MiniLog users
• change in Orion.ini to not produce $GPZDA message (was only for testing)

v3 (27-05-2019):

• Adjusted ttn for non-Minilog-users (caused constant restart)

v2 (27-05-2019):

• Added resume after standby

v1 (26-05-2019):

• Initial version