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Return to Gllin.

Personal tools

gllin is an userpsace driver for a hammerhead chip. It was distributed on phase1 openmokos.

Unfortunately, it is an OABI binary, and not even static one, so lots of stuff is needed for it to work. For security reasons, and for compatibility with EABI userland, it is probably best to run it in chroot. Zdanek's wrote an article how to put that together.


The changeroot trick

Your chroot will need to contain following files:


...and you"ll want to mount /sys there. Then, to get gps to work, do:

root@fic-gta01:/chroot$ cat /chroot/tmp/nmeaNP &
root@fic-gta01:/chroot$ chroot /chroot/ gllin -low 1
root@fic-gta01:/chroot$ chroot /chroot/ gllin -periodic 1

More infos and tricks are here: Manually_using_GPS.

gllin options

The /home/root/gllin file installed by the new (legitimate!) .ipk package is really just a shell script. You can modify the options passed to gllin.real by editing that script. Here are the options:


-help                    Help
-board <type>            Defines board type    Ex: '-board matchbox'
                         supported: matchbox, trident
-com <com port>          GPS com port;         Ex: '-com com6'
-baud <baud rate>        Set baud rate;        Ex: '-baud 115200'
-rft <RF type>           Set RF type;          Ex: '-rft RF_LN22OUT'
-freq <freq plan> | ?    set frequency plan for GPS or show the list of all available plans
                         Ex: '-freq FRQ_PLAN_OCXO_10000'
                         Ex: '-freq ?' -- Show all available plans
-g <URL>                 SUPL Server URL or IP address;
                         Ex: '-g'
-p <port>                SUPL Server port number;
                         Ex: '-p 9118'
-udp <port>              Local UDP port to send NMEA to.
                         '-udp 6000'      [default]
-gsm_cell <cell ID>      set GSM Cell ID information
                         cell ID has the following format: '<MCC>.<MNC>.<LAC>.<CI>'
                               MCC - Mobile Country Code
                               MNC - Mobile Network Code
                               LAC - Location Area Code
                               CI  - Cell Identification
                         Ex: '-gsm_cell 310.170.367.25732'
-set_assisted_off        disable SET assisted capability
-set_based_off           disable SET based capability
-msisdn <MSISDN>         set value for MSISDN (international phone number) as SET id
                         Ex: '-msisdn 14081234567'
-nai <nai>               specify Network Access Identifier as SET id
                         Ex: '-nai'
-periodic <s>            make periodic request every s second (-1 to 64)
                         -1  single shot: perform one fix, then quit
                          0       native: perform fixes as fast as possible
                         <s>       timed: report a position every <s> seconds
                                          where <s> is 1 to 64
-recover                 recover GLLIN after signaled exit
-low [<count>]           low level test.  Default <count> is 1
-low_debug               Low level debug ON
+low_debug               Low level debug OFF
-train <count>           Send train data <count> times
+pty | -pty              Enable or disable NMEA output to pty "/tmp/nmeaPTY"
                         Default is off [-pty]
+np | -np                Enable or disable NMEA output to named pipe "/tmp/nmeaNP"
                         Default is on [-np]
+nmea | -nmea            Enable or disable NMEA output to log file
                         Default is off [-nmea]
+daemon | -daemon        Become a daemon (or not)
                         Default is -daemon
-a2 | -a3 | -a0          Select a GTA01 board revision.  Default is a3
-batch <st> <n> <fix>    perform batch test of <n> starts of type <st>
                         <st> is hot, warm, cold, or SNR.
                         Each start has <fix> fixes.
-i                       start GLLIN command line
+pnd                     optimize for PND
-pnd                     look for low signal strength signals
+sim                     using simulator so don't use almanac
-sim                     not using simulator
SNR                      manufacturing SNR test mode
hot                      hot start [default]
warm                     warm start
cold                     cold start
-v[n]                    Report GLLIN version string.
                         n is 1234 to report selected versions.
 version 1.1.7

Some notes:

The listed defaults don't seem to be correct. By default it DOES generate NMEA data in log files. These log files are on your flash (/home/root/gllin/log/*) and are written to once every second. Ridiculous!

To stop this, add the option "-nmea" to the second of the two gllin.real commands in the startup script.

But note further that the startup script also spawns a command to cat the output of the /tmp/nmeaNP named pipe to a gzipped file in /home/root. If you want this to stop, you can do one of two things:

 * cat to /dev/null instead of | gzip >> file
 * add "-np" to the second gllin.real command

You can't just take the cat out of the script, because with the named pipe activated, gllin will QUIT if it doesn't see anybody taking the output from the pipe. To keep it going, either open that pipe or turn it off.