$GPRMC and NMEA how to extract from report

[cr-ispinternet]

Hi There,

 

Im a little bi lost and not sure where to start with this one, ive got a small gps receiver which im

polling over a serial connection, each time i poll the device i get a load of rubbish back like this...

 

$GPRMC,223450.000,A,5310.5785,N,00226.2042,W,0.0,25.8,291109,,,A*49

$GPGGA,223450.000,5310.5785,N,00226.2042,W,1,06,2.1,22.3,M,59.1,M,,0000*7D

$GPVTG,25.8,T,,M,0.0,N,0.0,K,A*32

$PMST200,00,204*1E

$PMST200,00,204*1E

$PMST200,00,204*1E

$PMST200,??,204*1E

$PMST200,??,204*1E

$PMST200,??,204*1E

$PMST200,??,204*1E

$PMST200,??,204*1E

$PMST200,??,204*1E

$GPGLL,5310.5785,N,00226.2042,W,223450.00,A,A*73

$GPGSA,A,3,02,04,05,07,08,10,,,,,,,4.5,2.1,4.0*39

$PMST200,??,204*1E

$PMST200,??,204*1E

$PMST200,??,204*1E

 

As they are never ever in the same order i cant really use reg_exp to get what i want, basically im

trying to capture the following and then use split to break them down further and insert into a DB

 

$GPRMC,223450.000,A,5310.5785,N,00226.2042,W,0.0,25.8,291109,,,A*49

 

how can i just get it to extract that line and nothing else unless i ask it to????

 

the output from the serial devic come is extract using this

 

$read = $serial->readPort();

 

than i just echo read etc etc and get my text which is further up, any ones help

or suggestions would be brill...

 

thanks in advance

 

Alan

[salathe]

You could use a basic regular expression to grab only the $GPMRC line (are you familiar at all with regular expressions?) then break that down into an array (or whatever) to work with.

 

Here's a quick example (only lines 1, 2 and 4 are important).

preg_match('/^\$GPRMC,.*$/m', $read, $match);
$line   = $match[0];
$keys   = explode(',', 'command,timestamp,fix,lat,lath,lon,lonh,knots,bearing,date,mag_var,mode,checksum');
$values = explode(',', $line);
$recmin = array_combine($keys, $values);

// Just output the array to test
var_dump($recmin);

[cr-ispinternet]

Sal...

 

You the man my friend, im not that great with regular expressions but i knew thats

what i need to do to get my output. Many thanks for taking a look at that for me i knew

some one on here would be able to help me...

 

thanks so much

 

Alan