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calculating GPS checksum

 
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on7nh



Joined: 05 Jun 2006
Posts: 41
Location: Belgium

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calculating GPS checksum
PostPosted: Tue Nov 28, 2006 2:02 pm     Reply with quote
hello folks,

i am searching now a few days for a example for calculating a Xor checksum from a GPS string :

the string sounds like = "$GPWPL,0051.123,N,00004.568,E,MOTO1"

have anybody a idea to do this?

thanks,
ON7NH

Carl
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Nov 28, 2006 2:26 pm     Reply with quote
I don't think you could search for a few days. In just a few seconds I
can find the answer with http://www/google.com by searching for this
search string:
Quote:
NMEA-0183 checksum


Or search on the CCS forum for:
Quote:
NMEA-0183 checksum

Then you find one of my old posts with a routine.
http://www.ccsinfo.com/forum/search.php
Guest
PostPosted: Wed Nov 29, 2006 1:32 am     Reply with quote
I know how to calculate the checksum =-)

the problem i have is that i need a instruction like mid$ in VB

this is what i have know :
Code:

        for( i=0; i<lengte; i++ )
              {
            // here i need the code to seleckt each character in the string
               fprintf(serial,"%s\n\r",character);
               sumcheck = sumcheck ^ character;
              }
davekelly



Joined: 04 Oct 2006
Posts: 53
Location: Berkshire, England

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PostPosted: Wed Nov 29, 2006 2:25 am     Reply with quote
That's just basic c programming for character arrays

Code:

sumcheck = sumcheck ^ inputString [i];
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