TS-7180 GPS: Difference between revisions

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The TS-7180 has an optional on-board [http://www.telit.com/gnss/sl869/ Telit SL869] GPS receiver. An SMA female connector is provided for the connection of an antenna.
[[File:TS-7180-GPS-Antenna.png|300px]]
 
The TS-7180 has an optional on-board [http://www.telit.com/gnss/sl869/ Telit SL869] GPS receiver, accessible at <code>/dev/ttymxc7</code>, through which the GPS provides NMEA strings. An SMA female connector is provided for attaching an antenna.
 
The GPS power is controllable through a GPIO.  For example:
<source lang=bash>
gpioset 5 19=1 # turn on GPS
gpioset 5 19=0 # turn off GPS
</source>
By default, the GPS module is powered on when the board starts up.
 
A typical way of interfacing with the GPS is using <code>gpsd</code>.  For example, under Debian, load these packages:
<source lang=bash>
apt install gpsd gpsd-clients -y
</source>
Then edit <code>/etc/default/gpsd</code> and enable and/or change these two variables:
<syntaxhighlight lang="bash">
# Devices gpsd should collect to at boot time.
# They need to be read/writeable, either by user gpsd or the group dialout.
DEVICES="/dev/ttymxc7"


[[File:TS-7180-GPS-Antenna.png|300px]]
# Other options you want to pass to gpsd
GPSD_OPTIONS="-n"
</syntaxhighlight>


Before it can be used, power to the GPS receiver must be enabled by setting GPIO #19 low, as shown below:
Then restart gpsd:
<source lang=bash>
<source lang=bash>
tshwctl -a 19 -r -w 1
service gpsd restart
</source>
</source>


{{Note|On REV A/B boards the GPS is always enabled.  Boards ordered after March 5th, 2019 will include this modification, but if your unit has Q29 populated and you would like to use GPS, submit an [RMA https://www.embeddedarm.com/support/rma.php] and we can modify boards.  REV C will include a fix to allow GPS to be powered on/off without modification.}}
For testing, run <code>gpsmon</code> to see lock, coordinates, and time information.
 
You will likely want <code>gpsd</code> to start automatically at boot. To make this always happen, type:
<source lang=bash>
systemctl enable gpsd
</source>


The GPS receiver may then be accessed via the /dev/ttymxc7 uart.
Finally, the following article describes writing clients that interface with <code>gpsd</code>, which can do so from most programming languages:
* [https://gpsd.gitlab.io/gpsd/client-howto.html gpsd writing clients]

Latest revision as of 16:01, 31 August 2021

TS-7180-GPS-Antenna.png

The TS-7180 has an optional on-board Telit SL869 GPS receiver, accessible at /dev/ttymxc7, through which the GPS provides NMEA strings. An SMA female connector is provided for attaching an antenna.

The GPS power is controllable through a GPIO. For example: 

gpioset 5 19=1 # turn on GPS
gpioset 5 19=0 # turn off GPS

By default, the GPS module is powered on when the board starts up.

A typical way of interfacing with the GPS is using gpsd. For example, under Debian, load these packages: 

apt install gpsd gpsd-clients -y

Then edit /etc/default/gpsd and enable and/or change these two variables: 

# Devices gpsd should collect to at boot time.
# They need to be read/writeable, either by user gpsd or the group dialout.
DEVICES="/dev/ttymxc7"

# Other options you want to pass to gpsd
GPSD_OPTIONS="-n"

Then restart gpsd: 

service gpsd restart

For testing, run gpsmon to see lock, coordinates, and time information.

You will likely want gpsd to start automatically at boot. To make this always happen, type: 

systemctl enable gpsd

Finally, the following article describes writing clients that interface with gpsd, which can do so from most programming languages:

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