GPS u-blox

Some Armadeus/Opossom SOM are shipped with u-blox chips for GPS functionnality; as these chips have custom tools, they will be detailed here.

Tools installation

• To benefit from u-blox custom features, you have to activate them in gpsd:

$ make menuconfig

Target packages  --->
    ...
    Hardware handling  --->
        ..
        [*] gpsd  --->
            ..
            [*]   install python tools (ubxtool, python-gps, etc...)
            *** Protocols ***
            ...
            [*]   UBX

• rebuild rootfs, reflash, you know ;-)

Usage

• In following examples $SERIAL_DEV is the serial port device on which the GPS is connected (/dev/ttyXXX)
• Show current NMEA config/version:

# ubxtool -p CFG-NMEA

• Activate NMEA 4.1 protocol (on NEO-8M):

# gpsctl -t u-blox -D 5 -b -x "\x06\x17\x00\x41\x00\x02\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00" $SERIAL_DEV

• Switch u-blox module to UBX binary frame format:

# gpsctl -t u-blox -b $SERIAL_DEV

• Switch u-blox module to ascii NMEA frame format:

# gpsctl -t u-blox -n $SERIAL_DEV

• Show current GNNS config:

# ubxtool -p CFG-GNSS

• Activate/deactivate Glonass:

# ubxtool -e/-d GLONASS

• Activate/deactivate Galileo:

# ubxtool -e/-d GALILEO

• Shows Galileo time status (galTOW):

# ubxtool -p NAV-TIMEGAL

• Activate/deactivate GPS:

# ubxtool -e/-d GPS

• Save config to chip (if possible):

# ubxtool -p SAVE

Links

• ubxtool documentation/manual