82 lines
2.1 KiB
Markdown
82 lines
2.1 KiB
Markdown
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# GPS: Glonass G-7020 VK-172 GPS
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I got myself the G-7020 GPS Module to connect my RPi via USB. Here is how it works
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```bash
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# requirements
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sudo apt install gpsd gpsd-clients python-gi-cairo minicom
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```
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Check if gpsd is already running
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```bash
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ps -aux | grep gpsd
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kill <gpsd id>
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```
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Note if you're using the Raspbian Jessie or later release you'll need to disable a systemd service that gpsd installs. This service has systemd listen on a local socket and run gpsd when clients connect to it, however it will also interfere with other gpsd instances that are manually run (like here). You will need to disable the gpsd systemd service by running the following commands:
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```bash
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sudo systemctl stop gpsd.socket
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sudo systemctl disable gpsd.socket
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```
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Should you ever want to enable the default gpsd systemd service you can run these commands to restore it (but remember the rest of the steps here won't work!):
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```bash
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sudo systemctl enable gpsd.socket
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sudo systemctl start gpsd.socket
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```
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Check if port 2947 is free or blocked:
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```bash
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netstat -tulpn
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```
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Now list all ports and find the new one
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```bash
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ls /dev/tty*
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```
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or use system to show new devices
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```bash
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dmesg | grep tty
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```
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Test if the choosen port gets data
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```bash
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cat /dev/ttyACM0
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```
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If you wish to go that route, for whatever reason, before doing anything else, make sure gpsd is not running.
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```bash
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sudo killall gpsd
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```
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and remove any sockets gpsd might have left behind,
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```bash
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sudo rm /var/run/gpsd.sock
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```
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Change from binary to NMEA:
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```bash
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gpsctl -f -n /dev/ttyUSB0
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stty -F /dev/ttyACM0
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#set baud rate of GPS
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stty -F /dev/ttyACM0 9600
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```
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Now test your device
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```bash
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minicom -b 9600 -o -D /dev/ttyACM0
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```
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To leave minicom press 'Ctrl-A' then 'X' and ENTER
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and test gpsd
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```bash
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gpsd -b -n -N -D4 -s 9600 -S 2948 /dev/ttyACM0
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```
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You can configure your GPS device by editing `/etc/default/gpsd`:
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```bash
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START_DAEMON="true"
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USBAUTO="true"
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DEVICES="/dev/ttyACM0"
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GPSD_OPTIONS="-b -n -S 2900"
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GPSD_SOCKET="/var/run/gpsd.sock"
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```
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After that restart the service and watch the results
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```bash
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sudo service gpsd restart
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xgps
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cgps -s
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```
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