Getting GPS Coordinates using NMEA

Legato Application Framework
1

HI,

I am trying to get GPS coordinates using NMEA but failing to do so.

  1. My /etc/legato/usbmode file contains “nmea”

  2. i’ve tried

echo "\$GPS_START" > /dev/nmea
  1. then
cat /dev/nmea

gives the following o/p

$GPVTG,,T,,M,,N,,K,N*2C $GPGSA,A,1,,,,,,,,,,,,,,,*1E $GPGGA,,,,,,0,,,,,,,,*66 $PQXFI,,,,,,,,,,*56 $GPRMC,,V,,,,,,,,,,N*53

I was supposed to get a more detailed “$GPRMC” right ??

Am i missing something ?
Please guide.

Thanx.

2

[quote=“Karandeep007”] $GPRMC,,V,,,,,,,,,,N*53
I was supposed to get a more detailed “$GPRMC” right ??
[/quote]
Only when you have a valid GPS fix :exclamation:

The ‘V’ in the RMC sentence indicates that you do not have a valid GPS fix.

aprs.gids.nl/nmea/#rmc

3

[quote=“awneil”][quote=“Karandeep007”] $GPRMC,,V,,,,,,,,,,N*53
I was supposed to get a more detailed “$GPRMC” right ??
[/quote]
Only when you have a valid GPS fix :exclamation:

The ‘V’ in the RMC sentence indicates that you do not have a valid GPS fix.

aprs.gids.nl/nmea/#rmc[/quote]

Thanx a lot…that solved the problem :slight_smile:

4

Hi, is GPS supported on WP85 board ? Coz I was facing issues while trying to run it on WP85…

5

Hi

The mangoh board GPS does not currently work out of the box with an active GPS antenna. The problem is that the existing HW release does not supply a bias voltage to the antenna

Two options to work around this

  1. Use a passive gps antenna -in practice a standard GSM / 3G stub antenna will work
  2. Add a bias voltage to the GPS feed (be careful you could damage your hardware if you are not familiar with doing this)

Cheers

John