GPS: A780 LAPI interface decoded

[Floe]

Hello everybody,

as I wasn't too pleased with CoPilot (it's nice for routing, but I'd like
something with logging capability), I was looking for an open solution
to access the GPS device on the A780.

Building on the source code from mack (test_gps), I've managed to write a
small tool that connects to the GPS through lapisrv, therefore playing nicely
with, e.g., Copilot (at least in theory so far ). The GPS message contents
have been reverse engineered from stracing CoPilot and from lapisrv debug
messages.

I've attached the commented source code and a precompiled version - please
test liberally and report back. The final goal would be gpsd support..

Yours, Florian

EDIT: I've been asked by the OpenEZX guys to include a GPL license in the
source code. Please download the updated version.

[kawa0815]

Hello Floe!

Is a nice work and you make me happy!

I wish the next step is:
Compiling the source from
qpegps.sourceforge.net/index.html
an connect to your gpsd.

kawa

[lurker]

Great work, Floe! I don't have now to tinker with accessing to data provided by j2me-based gps daemon.

[Floe]

@lurker: glad to hear that - AFAIK, you were planning to port gpsd?
EDIT: have you tried running gpsdump in parallel with CoPilot? In theory,
lapisrv should handle that, but my late-night trial yesterday didn't work.

[lurker]

I wrote small java application that gets data from gps and communicates with clients in gpsd protocol, but non-java software couldn't access to it due to design of jvm. Now I can write native gpsd clone using your code.

I don't really need running CoPilot, because there are no maps of my location yet, but my midlet worked well in parallel with it.

[mack]

Great work, Floe!

Are you going to take the extra step and add lapisrv support to gpsd so standard gps applications can be used ?

[kawa0815]

Hello Floe,


I have trying your dump on my A780.
I have starting gpsdump from qconsole and waiting a while.
The output work after 3 min. fine.

kawa

[Floe]

Great work, Floe!

Are you going to take the extra step and add lapisrv support to gpsd so standard gps applications can be used ?

Well, I'll try.. I don't know yet when I'll have enough spare time, but on the other hand, it shouldn't be too difficult.

[Floe]

A note:

I've been asked by the OpenEZX guys to include a GPL license in the
source code. Please download the updated version from the first post.

Yours, Floe

[lurker]

Here's my gpsd-compatible daemon based on Floe's gpsdump. Few commands are supported (for now), but it should be enough for use with qpegps. Please test and post your response.