Getting GPS console output with gllin
This article describes the "quick start" procedure allowing to see the first output and actually use the GPS device in the command line mode, using the gllin driver.
After you download, scp and install the gllin_1.0+r350-r0_fic-gta01.ipk (or similar), it creates the folder 'gllin' in the root home. This folder contains the executable with the same name which starts the driver.
Type cat after you start the gllin, not before. The output from the GPS driver looks like
$GPRMC,235946.99,V,,,,,,,120180,,,N*78 $GPGSA,A,1,,,,,,,,,,,,,11.2,5.0,10.0*36 $GPGGA,235946.99,,,,,00,00,5.0,,M,0.0001999,M,0.0020199,*57 (and so on).
The data are presented in NMEA format which gives a lot of data. The coordinates themselves are reported with the two messages that are described below.
- 143812 Fix taken at 14:38:12 UTC
- A A for the normal (active) message or V for the void message. Void messages are described below.
- 4301.028,N Latitude 43 deg 01.028' N
- 01232.000,E Longitude 12 deg 32.000' E
- 020.0 Ground speed in knots
- 083.4 Track angle in degrees True
- 240307 Date - 24rd of March 2007
- 003.2,W Magnetic variation
- *6A The checksum, begins with *