Phase 1 GPS driver

From Openmoko

(Difference between revisions)
Jump to: navigation, search
 
m (spellcheck)
 
Line 20: Line 20:
 
  /home/root/DM2/gps/gllin -periodic 3
 
  /home/root/DM2/gps/gllin -periodic 3
  
The binary program was compiled to OABI format which now is obsolete as OM2007.2 builds are in EABI format. You can still run the binary with ''chroot''. [[user:Zdanek|Bartek Zdanowski]] wrote an [http://www.openmoko.org.pl/node/55 aticle] how to run GPS receiver. Alternativly ld-linux can be used to do the trick:
+
The binary program was compiled to OABI format which now is obsolete as OM2007.2 builds are in EABI format. You can still run the binary with ''chroot''. [[user:Zdanek|Bartek Zdanowski]] wrote an [http://www.openmoko.org.pl/node/55 aticle] how to run GPS receiver. Alternatively ld-linux can be used to do the trick:
  
 
==The ld-linux trick==
 
==The ld-linux trick==
  
you need the following files:
+
You need the following files:
  
 
  bin/gllin
 
  bin/gllin
Line 40: Line 40:
 
  lib/libutil.so.1
 
  lib/libutil.so.1
  
the file bin/gllin.sh contains:
+
The file bin/gllin.sh contains:
  
 
  #!/bin/sh
 
  #!/bin/sh
Line 47: Line 47:
 
  `pwd`/lib/ld-linux.so.2 --library-path `pwd`/lib `pwd`/bin/gllin -periodic 3
 
  `pwd`/lib/ld-linux.so.2 --library-path `pwd`/lib `pwd`/bin/gllin -periodic 3
  
be shure to start at least a `cat /tmp/nmeaNP` somewhere.
+
Be sure to start at least a `cat /tmp/nmeaNP` somewhere.
  
another aproach (chroot) is described in [[Gllin]] - here is also a link to a archive with all needed shared libraries in the right format.
+
Another approach (chroot) is described in [[Gllin]] - here is also a link to an archive with all needed shared libraries in the right format.
  
 
==Strange effects==
 
==Strange effects==
  
the message  
+
The message  
  
 
  Stack size 8864 bytes (9 KB)
 
  Stack size 8864 bytes (9 KB)
Line 59: Line 59:
 
means, nobody is reading on the pipe /tmp/nmeaNP, you probably forgot to start the `cat ...`.  
 
means, nobody is reading on the pipe /tmp/nmeaNP, you probably forgot to start the `cat ...`.  
  
the message
+
The message
  
 
  gllin: early exit(3) in halInit()/681
 
  gllin: early exit(3) in halInit()/681
  
is issued by the low-level hardware test but gllin works fine afterwords.
+
is issued by the low-level hardware test but gllin works fine afterwards.
  
do not use the option
+
Do not use the option
  
 
  +daemon
 
  +daemon
  
because gllin writes all files to /tmp then which is a bad idea. because /tmp is ram it is lost. because ram is limited the logfile will eat up your memmory.
+
because gllin then writes all data to file in /tmp which is a bad idea because /tmp is in kept in RAM so it's lost on reset. Also since the RAM is limited the logfile will eat up your memory.
  
 
[[Category:GPS]]
 
[[Category:GPS]]

Latest revision as of 03:00, 27 January 2008

This article describes problems and solutions that were extremely important in the past but seems obsolete now. This content is kept mainly to reflect the history of the project.

In the very early shipment to 50 Phase 1 developers, a binary-only program for talking to the the GPS was accidentally included in /home/root/DM2/gps, (and presumably, the same binary would function on a P0 device). It was compiled to OABI format which now is obsolete as OM2007.2 builds are in EABI format, but developers suggested tricks to run it with chroot. These approaches seem now obsolete and the old binary seems even no longer easily available.

[edit] Binary Daemon GLLIN

For those few with the binary driver in the meantime, Pavel Machek provides the following script for recording an NMEA stream from the binary program.

#!/bin/sh
echo 1 > /sys/class/leds/gta01\:vibrator/brightness
killall gllin cat
sleep 1
echo 0 > /sys/class/leds/gta01\:vibrator/brightness
mknod /tmp/nmeaNP p
cat /tmp/nmeaNP >> /tmp/gps.nmea &
/home/root/DM2/gps/gllin -low 5
/home/root/DM2/gps/gllin -periodic 3

The binary program was compiled to OABI format which now is obsolete as OM2007.2 builds are in EABI format. You can still run the binary with chroot. Bartek Zdanowski wrote an aticle how to run GPS receiver. Alternatively ld-linux can be used to do the trick:

[edit] The ld-linux trick

You need the following files:

bin/gllin
bin/gllin.sh
lib/ld-linux.so.2
lib/libc.so.6
lib/libgcc_s.so.1
lib/libm.so.6
lib/libnss_dns.so.2
lib/libnss_files.so.2
lib/libpthread.so.0
lib/libresolv.so.2
lib/librt.so.1
lib/libstdc++.so.6
lib/libutil.so.1

The file bin/gllin.sh contains:

#!/bin/sh
`pwd`/lib/ld-linux.so.2 --library-path `pwd`/lib `pwd`/bin/gllin -low 5
test -p /tmp/nmeaNP || ( rm -f /tmp/nmeaNP && mknod /tmp/nmeaNP p )
`pwd`/lib/ld-linux.so.2 --library-path `pwd`/lib `pwd`/bin/gllin -periodic 3

Be sure to start at least a `cat /tmp/nmeaNP` somewhere.

Another approach (chroot) is described in Gllin - here is also a link to an archive with all needed shared libraries in the right format.

[edit] Strange effects

The message

Stack size 8864 bytes (9 KB)

means, nobody is reading on the pipe /tmp/nmeaNP, you probably forgot to start the `cat ...`.

The message

gllin: early exit(3) in halInit()/681

is issued by the low-level hardware test but gllin works fine afterwards.

Do not use the option

+daemon

because gllin then writes all data to file in /tmp which is a bad idea because /tmp is in kept in RAM so it's lost on reset. Also since the RAM is limited the logfile will eat up your memory.

Personal tools

This article describes problems and solutions that were extremely important in the past but seems obsolete now. This content is kept mainly to reflect the history of the project.

In the very early shipment to 50 Phase 1 developers, a binary-only program for talking to the the GPS was accidentally included in /home/root/DM2/gps, (and presumably, the same binary would function on a P0 device). It was compiled to OABI format which now is obsolete as OM2007.2 builds are in EABI format, but developers suggested tricks to run it with chroot. These approaches seem now obsolete and the old binary seems even no longer easily available.

Binary Daemon GLLIN

For those few with the binary driver in the meantime, Pavel Machek provides the following script for recording an NMEA stream from the binary program.

#!/bin/sh
echo 1 > /sys/class/leds/gta01\:vibrator/brightness
killall gllin cat
sleep 1
echo 0 > /sys/class/leds/gta01\:vibrator/brightness
mknod /tmp/nmeaNP p
cat /tmp/nmeaNP >> /tmp/gps.nmea &
/home/root/DM2/gps/gllin -low 5
/home/root/DM2/gps/gllin -periodic 3

The binary program was compiled to OABI format which now is obsolete as OM2007.2 builds are in EABI format. You can still run the binary with chroot. Bartek Zdanowski wrote an aticle how to run GPS receiver. Alternativly ld-linux can be used to do the trick:

The ld-linux trick

you need the following files:

bin/gllin
bin/gllin.sh
lib/ld-linux.so.2
lib/libc.so.6
lib/libgcc_s.so.1
lib/libm.so.6
lib/libnss_dns.so.2
lib/libnss_files.so.2
lib/libpthread.so.0
lib/libresolv.so.2
lib/librt.so.1
lib/libstdc++.so.6
lib/libutil.so.1

the file bin/gllin.sh contains:

#!/bin/sh
`pwd`/lib/ld-linux.so.2 --library-path `pwd`/lib `pwd`/bin/gllin -low 5
test -p /tmp/nmeaNP || ( rm -f /tmp/nmeaNP && mknod /tmp/nmeaNP p )
`pwd`/lib/ld-linux.so.2 --library-path `pwd`/lib `pwd`/bin/gllin -periodic 3

be shure to start at least a `cat /tmp/nmeaNP` somewhere.

another aproach (chroot) is described in Gllin - here is also a link to a archive with all needed shared libraries in the right format.

Strange effects

the message

Stack size 8864 bytes (9 KB)

means, nobody is reading on the pipe /tmp/nmeaNP, you probably forgot to start the `cat ...`.

the message

gllin: early exit(3) in halInit()/681

is issued by the low-level hardware test but gllin works fine afterwords.

do not use the option

+daemon

because gllin writes all files to /tmp then which is a bad idea. because /tmp is ram it is lost. because ram is limited the logfile will eat up your memmory.