How to extract data from neo 6m gps module

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asking
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Posted by asking: Thu. Jul 10, 2014 - 06:50 PM
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Finally i have parsed the data and displayed time on the 16x2 Display. But i've issue regarding how to add +5.30 Time zone for india to current UTC time. any idea from friends here would help me to save my time...

Its not just simple to add 5hour to hour register and 30 minutes to min ones.. because when it would be 23 hours + 5 means it will show 28...and that's mess. so how to overcome this issue..

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awneil
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Posted by awneil: Thu. Jul 10, 2014 - 07:35 PM
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So you just handle the overflow from hours to days...

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Kartman
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Posted by Kartman: Thu. Jul 10, 2014 - 10:21 PM
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One common method is to convert time to seconds add/subtract your offset then convert back to 'real' time. Its a common problem.

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clawson
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Posted by clawson: Fri. Jul 11, 2014 - 08:51 AM
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Quote:

One common method is to convert time to seconds add/subtract your offset then convert back to 'real' time. Its a common problem.

Does your compiler offer functions like localtime() and mktime() ?

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JohanEkdahl
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Posted by JohanEkdahl: Fri. Jul 11, 2014 - 09:16 AM
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Quote:
Its not just simple to add 5hour to hour register and 30 minutes to min ones..

I'll paraphrase resident 'freak David Prentice: Sit dow and do a few such additions on paper. Then think. Perhaps make a cup of tea. Then think again.

Then implement in a C function what you just did on paper.

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asking
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Posted by asking: Fri. Jul 11, 2014 - 09:20 AM
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clawson wrote:
Quote:

One common method is to convert time to seconds add/subtract your offset then convert back to 'real' time. Its a common problem.

Does your compiler offer functions like localtime() and mktime() ?

i am using Atmel Studio 6 with GCC compiler. i don't know whether it supports..?

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clawson
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Posted by clawson: Fri. Jul 11, 2014 - 09:29 AM
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Quote:

i am using Atmel Studio 6 with GCC compiler. i don't know whether it supports..?

It doesn't have it in the currently issued version but in the "next" version you should find the functions added. In the meantime you can "cherry pick" what you need from here:

http://svn.savannah.nongnu.org/v...

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awneil
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Posted by awneil: Fri. Jul 11, 2014 - 12:17 PM
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If you need the full date/time arithmetic - complete with days, months, leap years, etc - then you should use the functions.

If you just want a correct roll-over of the hours, then that's just simple arithmetic...

Top Tips:

  1. How to properly post source code - see: https://www.avrfreaks.net/comment... - also how to properly include images/pictures
  2. "Garbage" characters on a serial terminal are (almost?) invariably due to wrong baud rate - see: https://learn.sparkfun.com/tutorials/serial-communication
  3. Wrong baud rate is usually due to not running at the speed you thought; check by blinking a LED to see if you get the speed you expected
  4. Difference between a crystal, and a crystal oscillator: https://www.avrfreaks.net/comment...
  5. When your question is resolved, mark the solution: https://www.avrfreaks.net/comment...
  6. Beginner's "Getting Started" tips: https://www.avrfreaks.net/comment...
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asking
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Posted by asking: Fri. Jul 11, 2014 - 03:16 PM
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Yes i just want time...so i will use simple asthmatics i have some idea will post once successful..

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asking
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Posted by asking: Fri. Jul 11, 2014 - 04:04 PM
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Finally i have little success in converting simple arithmetic calculations.. as below

i have added +5.30 for Indian standard time

hour = nmea.getHour();
minute = nmea.getMinute();
hour = hour + 5;
minute = minute + 30; 
if(minute > 59)
{
minute = minute - 60;
hour = hour + 1;
} 
if(hour > 23)
{
hour = hour - 24;
}
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