GPS decoding problems

[Heckler]

Here is how I decode the $gprmc sentence...

Partial code below

GPRMC VAR BYTE[64]

hh      VAR BYTE  'hours
mm      VAR BYTE  'minutes
ss      VAR BYTE  'seconds
sss     var word  'milliseconds
fix     VAR WORD  'GPS fix
latdeg  VAR BYTE  'degrees latitude
latmin  VAR BYTE  'minutes latitude  
latminn var word  'fractional minutes latitude
NS      VAR BYTE  'north or south
londeg  VAR BYTE  'degrees longitude
lonmin  VAR BYTE  'minutes longitude
lonminn var word  'fractional minutes longitude
EW      VAR BYTE  'east or west
Knots   VAR byte  'speed in knots (units)
Knotss  var byte  'speed in fractional knots
course  var word  'heading
dy      VAR BYTE  'day
mt      VAR BYTE  'month
yr      VAR BYTE  'year


'============= Main Program ==========================================
Main:
high gpwr
pause 3000

GPSin:
    serin2 gps,188,3000,tmout,[WAIT("$GPRMC,"),STR GPRMC\63\"$"] 'Data IN from GPS
    
    arrayread gprmc,[DEC2 hh,DEC2 mm,dec2 ss,_
      wait(","),fix,wait(","),DEC2 latdeg,DEC2 latmin,wait("."),dec4 latminn,_
      wait(","),NS,wait(","),DEC3 londeg,DEC2 lonmin,wait("."),dec4 lonminn,_
      wait(","),EW,wait(","),dec knots,dec Knotss,dec course,_
      wait(","),DEC2 dy,DEC2 mt,DEC2 yr]      'parse the GPS array into parts

if fix = "V" then gpsin  'jump to "waiting for fix" display

low gpwr
high xpwr
    pause 1000
    
    SEROUT2 xbtx,188,[$0D,$0A,"$GPRMC,",STR GPRMC\63]            'Data OUT to XBEE
    pause 500

Hope this helps

[sradayda]

Thanx so much .. I really appreciate it
Could you please provide me with GPS hardware connections with the pic ?

[mackrackit]

What are you using for the GPS? A handheld unit or a module?

[sradayda]

What are you using for the GPS? A handheld unit or a module?

I am using a module.

[mackrackit]

The module data sheet should give the pin out. RX and TX.

[sradayda]

The module data sheet should give the pin out. RX and TX.

Thanks, but to which pins of the pic16f877 should these pins be connected ??

[mackrackit]

Well.... Back to the data sheet if you are planning to use the USART. Pins RC6 and 7.

If you are going to use SERIN2 then just about any of the pins will work.