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anupam19 / i2c-gps-nav

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ublox initialization problem #6

Open GoogleCodeExporter opened 9 years ago

GoogleCodeExporter commented 9 years ago 
What steps will reproduce the problem?
1. Can't initialize ublox
2.
3.

What is the expected output? What do you see instead?

What version of the product are you using? On what operating system?

Please provide any additional information below.
Hi EOSbandi, recently I used your 2.2 beta release. can't initialized ublox GPS.
I guess Serial.write(PSTR("xxxxx")); can't be used.
maybe need some pgm_read_byte ?

thanks

Original issue reported on code.google.com by mail.ima...@gmail.com on 23 Feb 2013 at 3:31

GoogleCodeExporter commented 9 years ago 
Or just we just erase PSTR.

Original comment by mail.ima...@gmail.com on 23 Feb 2013 at 3:35

GoogleCodeExporter commented 9 years ago 
My comments are based on I2C_GPS_NAV_v2.2Beta1-r62.rar and using the UBlox 
CN-06 GPS unit that has no EEPROM fitted.

Indeed PSTR doesn't work with Serial.Write(). I have added a helper function to 
allow the strings still to be stored in program memory.

There are other problems to:

1) I think line no:1513 in I2C_GPS_NAV_v2_2.ino  "lastframe_time = millis();" 
is in the wrong place. It should be moved up to after line no: 1477
The way it is in r62 the variable lastframe_time is only updated when we have a 
(3D fix && we have 5 or more sats). This stops the single led blink from 
indicating a good packet, and the double led blink from indicating a 2D fix.

2) I find the delay(5); on line no:1283 essential, without it the GPS fails.

3) I find bridging of pins 13 and 14 on the NEO-6M module essential also.

Attached are my changes with comments.

Original comment by th9...@gmail.com on 5 Apr 2013 at 2:13

Attachments:

GoogleCodeExporter commented 9 years ago 
Bang on! #2 th9 your version fixed the issues I was having with my v2 CN-06 as 
well.

Additionally I had to change the definition of UBLOX_INIT to:

const char UBLOX_INIT[] PROGMEM = {

I think that's because I am using Linux and GCC does not support the older 
progmem typedefs, but I am no expert so I'm not sure.

I think your point about moving lastframe_time was spot-on as well but I 
haven't dug deep on that - indeed it looks like it was a bug.

Are any fixes likely to be committed? I see no changes to the repo since last 
year.

Thanks for your tips, certainly restored my sanity after a few late nights 
trying to get this puppy going!

Original comment by goo...@purple.dropbear.id.au on 23 Jul 2013 at 2:52

GoogleCodeExporter commented 9 years ago 
No problem, glad it helped. I have no idea if this will ever get commited. I 
would have thought raising an issue and then posting the fix would have spurred 
some action !

Original comment by th9...@gmail.com on 24 Jul 2013 at 11:23

GoogleCodeExporter commented 9 years ago 
I'm guessing that EOSBandi has plenty of other things on his plate. At least 
with your fix now "tested" by another user it might make it easier to consider 
for inclusion.

I've taken the liberty of attaching your changes as a patch which also includes 
my change to the progmem stuff, hopefully that will make it easier to merge in.

Original comment by goo...@purple.dropbear.id.au on 24 Jul 2013 at 11:07

Attachments:

GoogleCodeExporter commented 9 years ago 
Hi, 

Sorry to resurrect an old thread, but I found this key to getting GPS working 
for me.

Your suggested changes are DEFINITELY needed to get the Crius I2C-GPS Nav board 
talking to a ublox based GPS module (i.e. VK16D) that does not have EEPROM (it 
was supposed to have one, but with the config WORKING with your changes, it is 
not needed!!!!)  I was dead in the water until I made your changes.  As a bonus 
I can run the GPS at 57200 the optimal rate.  THANK YOU!!!!

Original comment by kirkb4...@gmail.com on 6 Nov 2014 at 1:13

Attachments:

GoogleCodeExporter commented 9 years ago 
It's good to here this is still helping people out. Thanks for the thanks !

Original comment by th9...@gmail.com on 6 Nov 2014 at 10:08