Navigation GPS

[alexfish]

Hi All
NOTE:Thread Closed: Hug API HERE

I am in progress of making a navigation app written in bacon , as can say

from this thread will be applying various code from diffent threads HERE.

in one thead RE X11 widgets I mentioned a gps nmea parser.

I found a simple parser on Github. so here, have a simple parser

in archive are gps.h and gps.c

at present using c print functions , so yes room for improvements , but it be hot off the press.


the bacon code

' demo gps.bac
' TODO change path to files gps.c & gps.h
PRAGMA INCLUDE /home/pi/bacon/gps.h
PRAGMA INCLUDE /home/pi/bacon/gps.c
OPTION PARSE FALSE

SUB print_tpv_value(const char *name, const char *format, const int32_t value, const int32_t scale_factor)

   printf("%s: ", name)
   IF (GPS_INVALID_VALUE != value) THEN
   
       printf(format, (double)value / scale_factor)
   
ELSE
       puts("INVALID")
END IF

END SUB


LOCAL   tpv TYPE struct gps_tpv
LOCAL result TYPE int
DECLARE str[256] TYPE char
   IF (argc != 2) THEN
   
       PRINT "Usage: PROGRAM NMEA\n"
       END
   END IF

   /* Append CRLF to the user supplied string */
   snprintf(str, sizeof(str), "%s\r\n", argv[1]);

   /* Sets the data to a known state */
   gps_init_tpv(&tpv)

   /* Attempt to decode the user supplied string */
   result = gps_decode(&tpv, str)
  IF (result != GPS_OK) THEN
       fprintf(stderr, "Error (%d): %s\n", result, gps_error_string(result))
      END
   END IF

   printf("Talker ID: %s\n", tpv.talker_id)
   printf("Time Stamp: %s\n", tpv.time)
   print_tpv_value("Latitude", "%.6f\n", tpv.latitude, GPS_LAT_LON_FACTOR)
   print_tpv_value("Longitude", "%.6f\n", tpv.longitude, GPS_LAT_LON_FACTOR)
   print_tpv_value("Altitude", "%.3f\n", tpv.altitude, GPS_VALUE_FACTOR)
   print_tpv_value("Track", "%.3f\n", tpv.track, GPS_VALUE_FACTOR)
   print_tpv_value("Speed", "%.3f\n", tpv.speed, GPS_VALUE_FACTOR)

use from terminal ,sample String
'$GPRMC,023044,A,3907.3840,N,12102.4692,W,0.0,156.1,131102,15.3,E,A*37'

I be busy for rest of week , Rest of bits to follow
remember to change the path of where gps.c & gps.h are

ADDED X11/cairo testframe : will not work on PI3
Now in process of looking at original X11/cairo the works on PI3(only)

Please Note : at init stage ; there are 162 images to download and convert
before the Window shows . IE combine openstreet & openseamap marks
Hence launch from the Terminal to monitor progress

key input works , use arrow keys + PageUp/PageDown for Zoom 1 and 2
Maximize the window , will see Large red square and 2 smaller square outlines
the smallest has peep hole 1px * 1 px that should be the GPS cord's

can change 'zoom' + lat and long..
x11/cairo file updated
Sorted Mem loss + now have stable key input draw event :: IE should be no flicker

BR
Alex

Attachments:

gps.tar.bz2 (6.33 KB)

xwin3_2_1.bac.bz2 (5.99 KB)

[vovchik]

Dear Alex,

I changed the paths as you suggest, and am getting compilation errors. I have attached the log.

With kind regards,
vovchik

Attachments:

gps.bac.log.tar.gz (2.27 KB)

[rikky]

I've got the same error. 

May I be so bold to advise you to go to the opencpn.org website, and download their software ?
It 'll save you a tremendous amount of work, and If you like sailing, then their software works, I know for a fact.
Sometimes it's tricky to get your gps or ais device recognised though.
(I have this problem now,,, again.)

 Rik.

Edit PS:
Just realise, that if you sail, and you look on your computer too much, you won't survive this 

[alexfish]

Hi Vovchik


not sure if this is bacon version problem

, since I have a beta : pre release of latest stable ,

reason for the query is the c version compliles An what is in there is a Like for Like,

My initial thoughts are the PRAGMA INCLUDE,


PRAGMA INCLUDE /home/pi/bacon/gps.h
PRAGMA INCLUDE /home/pi/bacon/gps.c

in previous posts of earlier bacon version the pragma include used to work with quotes


PRAGMA INCLUDE "/home/pi/bacon/gps.h"
PRAGMA INCLUDE "/home/pi/bacon/gps.c"


my version will not;

can try quoted and see what happens

BR
Alex

@ Rik

open cpn is c++ and runs in about 200Mb maps and has all the traits , so in one sence
one can see that I do have opencpn, that is why I bought RPI4 8gb mem & a 128gb sim card
and the also the reason I bust the PI3 downloading the 3GB maps of the north sea for it to run
although I do like the Radar feature,

Sorry to hear about the accident.

BR
Alex

[bigbass]

Hello Alex

Along with the reports of Rik and vovchik
it wouldn't compile for me also
I know you are busy so I took a look why

I added PRAGMA OPTIONS -Wno-implicit-int

and downloaded the original header and c file
github.com/JCube001/libgps
your code does compile correctly now

(I don't have a boat but will help where I can)

Joe

libgps-example.tar.gz (7.14 KB)

[vovchik]

Dear Joe,

Thanks. It now compiles fine and runs as it should, I think.

With kind regards,
vovchik

[bigbass]

Hello vovchik
(Rik and Alex)


I was happy to see it was a cmake build so would be easy to package
into a deb or rpm if needed with some editing to the CMakeLists.txt

it builds correctly (docs also and test-gps)
passed all 18 tests

the ouput from the ported bacon code from Alex should produce this result
I tested it against the simple-usage.c and they are correct

Joe


./gps2 '$GPRMC,023044,A,3907.3840,N,12102.4692,W,0.0,156.1,131102,15.3,E,A*37'
Talker ID: GP
Time Stamp: 2002-11-13T02:30:44.000Z
Latitude: 39.123066
Longitude: -121.041153
Altitude: INVALID
Track: 156.100
Speed: 0.000

[bigbass]

Hello guys

so as not to distract from the bacon
c code app that Alex will be doing here I"ll keep
This short


I figured out how to do gps tests with an android phone
and a raspberry pi without any special hardware kits
such as a LoRa/GPS HAT GPS antenna.


experimental-coding.freeforums.net/post/685


Joe

[alexfish]

Hello Joe & Vovchik

Re original tar file had a modded version ,c file

had done this to avoid a compiler warning on undeclared var To int type

in simple terms where the return bit is a CHAR.

thus trying to avoid having to ad this to the compler directives.
PRAGMA OPTIONS -Wno-implicit-int
so having moded the c code, thinking header file
pi@raspberrypi:~ $ cd /home/pi/Downloads/joe/libgps-example
pi@raspberrypi:~/Downloads/joe/libgps-example $ diff gps.c gps2.c
50c50
<     static const hex[] = {
---
>     static const char hex[] = {
pi@raspberrypi:~/Downloads/joe/libgps-example $ diff gps.h gps2.h
pi@raspberrypi:~/Downloads/joe/libgps-example $

so i am looking further

BR
Alex

@ Joe

Thanks for posting the original files.. and the solution.
For reference to gpsd clients , I posted a simple method for decoding ais on the Navigation(AIS) thread

since we are dealing with NMEA
Feel Free to post Here & or The AIS thread ,

MANY thanks to U all

ADDED::

I have a part completed BaCon Interface based on this gpslib
as can See Where I got stuct

BR
Alex

[bigbass]

Hello Alex

with drones and robotics gps data is an important tool
to add to the mix

Feel Free to post Here & or The AIS thread

I will only post what could be helpful
to test gpsd or document some steps
that I found to be working during the testing process
to save forum space 305kb I uploaded the doxygen generated
docs from the cmake build here
sourceforge.net/projects/bassix-gtk3-webkit-browser/files/EXTRA-SUPPORT/libgps-docs.tar.gz/download

just open the index.html
to load the full documentation

this is very useful
gpsd.gitlab.io/gpsd/

Joe

[alexfish]

Agh Well

not sure how I did it but the original zipy has the wrong header file ; gps.h

after a bit of testing will post an update

BR
Alex

[alexfish]

Hi All

New Archive at First post

Have tested with latest BaCon Fossil . seems OK

BR
Alex

[rikky]

Well, it's a long time ago.

I used to do this thing for a living until about 5 years ago
transporting cargo everywhere, inland's, between Emden (D) and Sete ((F) Mediterranee)

But due to health problems and the economic situation for little ships, we had to stop.
There was no other option.
Nowadays I am welding little boats in the cargo space.
And since I'm half retired, the rest of my time I spend with my wife in her garden, or on BaCon programming as a hobby.

Back then it was Marinux that saved my ars.

Fiddle a bit with the baud-rate (I forgot, will fill this in later) , and set the gpsd to gpsd -D 5 -nN /dev/ttyUSB0.
(Totally forgot what this means) and then everything worked like a sharm.

So there was no real pressure anymore to have this thing up and running when my laptop died.

I do have a little lcd screen  with a Rpi3 in the steering cabin.
I did several attempts the last few years.
Never realy succeeded.

Now I know why.

apparently when you plug in a GPS or AIS, then the kernel loads a module.
since I have this Berryboot system, this doesn't work.
It crashes the whole system.

So I'm glad someone on the Bacon forum has taken up the glove.

I will do all my effort to help, if only it is out of self interest.
Starting with yet again installing a new Operating System.
This time I'll use a raspi 4.
And NO Berryboot system.

Be back tomorrow(?) with info of how far I stand.

@ alexfish
Thanks.

 Rik.

[rikky]

Ok, posting this from my new Rpi4 Official OS via Noops.

If you can read this that means I'm alive.

Ghhhhh.... Horrible .

It's like Windows.

You take a newer computer, which is bigger and faster, ... and it takes fuc*in longer to startup.

Next job is to make it headless , giving it a static ip and put it in the steering cabin.

 Rik.

[vovchik]

Dear Rik,

Good luck...and you seem to be making good progress. I have been using my RP4 with Buster/testing for some time now and everything is working fine.

With kind regards,
vovchik