extended GPS driver
modified driver, based on the Seeed.GPS module and driver.
Impliments:
For indoor testing your software it’s contain a virtual driver, delivering GPS NMEA data based on a txt file.
it’s VB-Code 
If I am not mistaken this is the first VB project on codeshare.
… and .vb can’t be viewed without downloading.
Need an update to the viewer.
the second version was uploaded
The processing of the UBX-messages was renewed. A UBX-Message-class was generated.
Some bugfixes.
A usage example is added to show how to use the ALP-File from “http://alp.u-blox.com/current_3d.alp”.
with the ALP file you get a GPS-Fix in only a few seconds and you get a Position at places with a non clear sky (somtimes i get an inddor position fix)
I’ve change the namespace and the dll-name so is possible to replace the official driver.
the replacement is described in:
the replaced driver is useable in VB and C# with the designer
I will post a new codeshare projekt with a prove of concept using the driver in a c# project
Thanks Daniel for this new driver! I was struggling with the buffer overflow.
2 things I noticed:
[ul]The shift operator in VB (<< and >>) does not work in the latest version of the framework[/ul]
[ul]The Latitude is spot on with my real coordinate, but the longitude is not. About .7 degrees off. I did not had time to investigate the code to see where it could be coming from.[/ul]
Thanks again!
@ Gabriel M -
no problem with vb10 / .NET Micro Framework SDK 4.2 (RTM QFE2) / GHI V 4.2.10
the driver don’t calculate the coordinate, so maybe problem with the fix/state of the gps.
I’m thinking about evaluate the accuracy and add the value to the ‘POSITION’-Object
I have VB12 / NETMF SDK 4.3 and the latest GHI. Looks like the issue is from the NETMF side.
I do not know how GPS works behind the scene, I was assuming that it would have give the right lat/long out of the box. Being offset of ~55kms is kind of annoying. If you can fix that I will appreciate, meanwhile I’ll check about the POSITION object!
@ VB-Daniel - I retried the original Seeed driver and it’s giving me the right position.
Do you have a compile version of your code? I’ll like to try it.
@ Gabriel M - sorry for the late answering…realy busy time…
I can’t retrace your problem. I just tested outside and get a valid position.
So some questions.
do you wait for the position received event
or do you parse the NMEA message
if you parse the NMEA message are you sure the position is fixed ?
before the gps is thrown non valid values → see gga message
field 6 fix status :
0 - no fix / invalid
1 - 2D or 3D
2 - DGPS
6 - estimated fix
look after the units
position.latitude dd.ddddddd
position.latitudestring “ddmm.mmmm”
position.longitude dd.ddddddd
position.longitudestring “dddmm.mmmm”
it’s not possible to load it on codeshare…
post your mail on monday evening (europe-time)
i answer the files…
revise my code
2)change the baudrate to 57600 / save a lot of procesor time
3)add a function to send raw data to the gps, nedded to send RTCM data