GPS on the Neo 1973

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discussion]] available as to what significance that "A" might have.
 
discussion]] available as to what significance that "A" might have.
  
As of P1, a binary-only program for talking to the the GPS is available
+
All purchased phones do not include the GPS binary driver.  [http://lists.openmoko.org/pipermail/community/2007-July/008466.html]
in /home/root/DM2/gps, (and presumably, the same binary would function
+
But finally, as described in [[November_29%2C_2007_Community_Update]], the binary driver is available to the community now.
on a P0 device). There is an ongoing effort to write a Free Software
+
 
 +
There is an ongoing effort to write a Free Software
 
program that could be used instead of this binary-only program. See
 
program that could be used instead of this binary-only program. See
[[Hammerhead_protocol]] for details and the latest status.
+
[[Hammerhead/Protocol]] for details and the latest status.
  
In the meantime, Pavel Machek
+
== Quick test (driver output to console) on Neo1973 Phase 1 ==
[http://pavelmachek.livejournal.com/39229.html provides] the
+
''Main article: [[Getting GPS console output with gllin]]''
following script for recording an NMEA stream from the binary program:
+
  
#!/bin/sh
+
To get the output of this driver, read the file /tmp/nmeaNP (it is actually a pipe, not a file). The simplest way is to open another ssh connection to the phone and use cat:
  echo 1 > /sys/class/leds/gta01\:vibrator/brightness
+
  cat /tmp/nmeaNP
killall gllin cat
+
 
sleep 1
+
This way it is possible to see the first results very easily.
echo 0 > /sys/class/leds/gta01\:vibrator/brightness
+
 
mknod /tmp/nmeaNP p
+
== The "GPS Sight" program with graphic interface ==
cat /tmp/nmeaNP >> /tmp/gps.nmea &
+
''Main article: [[GPS Sight]]''
/home/root/DM2/gps/gllin -low 5
+
 
/home/root/DM2/gps/gllin -periodic 3
+
There is also a working open source GPS preview program to get the gllin output to the graphical environment. It can immediately show the location, altitude, speed and curved distance from selected point. This program can also draw the covered path (no background map).  
 +
 
 +
== The old program in /home/root/DM2/gps ==
 +
''Main article - [[Phase 1 GPS driver]]''
 +
 
 +
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.
 +
 
 +
== Bluetooth GPS ==
  
 
He also [http://pavelmachek.livejournal.com/39659.html succeeded]
 
He also [http://pavelmachek.livejournal.com/39659.html succeeded]
Line 52: Line 60:
 
  ) &
 
  ) &
  
 +
== Using UDP ==
 +
 +
gllin sends a udp packet per nmea sentence on port 6000. this is a much cleaner aproach because using files will fill up memory or rootfs (the latter will result in the need for reflashing).
 +
 +
i switch off writing to /tmp/nmeaNP and logging to log/... with
 +
 +
-np
 +
-nmea
 +
 +
the help says that -nmea is the default, fact is that gllin logs nmea sentences into ./log/<date> wich will fill up mem or rootfs for long running tests. the following python script reads the nmea sentences (you need to have python-io installed to get the socket module):
  
As people develop more sophisticated GPS applications, please note them here.
+
#!/usr/bin/python
 +
import sys
 +
import socket
 +
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
 +
s.bind(('127.0.0.1', 6000))
 +
while True:
 +
    line = s.recv(1024)
 +
    sys.stdout.write(line)
 +
    sys.stdout.flush()
  
Here are some ideas for possibilites:
+
the program just prints those to stdout but other methods are possible (i feed them into a NMEA parser).
  
* Cairo-based mapping
+
benefits are that both programs can be started and stopped at will. none needs the other. gllin will not terminate if /tmp/nmeaNP is not there or not read from. the `cat /tmp/nmeaNP | gzip > gps.gz` is a useless idea anyway because the files in log/ (current directory) contains the NMEA data already.
  
* Routing
+
== NMEA ==
 +
The ouput from the binary driver seems to follow the NMEA standard.
  
* Openstreetmap logger, (with voice annotations)
+
Some information about it is available at [http://gpsinformation.org/dale/nmea.htm gpsinformation.org] and on [http://en.wikipedia.org/wiki/NMEA Wikipedia].
  
See [[openstreetmap]] - this is a page which needs fleshed out to a proper application page.
+
[[Category:GPS]]

Latest revision as of 08:14, 19 July 2009

The Neo1973 device contains an integrated GPS. The particular device is marketed as an AGPS, and there is some discussion available as to what significance that "A" might have.

All purchased phones do not include the GPS binary driver. [1] But finally, as described in November_29,_2007_Community_Update, the binary driver is available to the community now.

There is an ongoing effort to write a Free Software program that could be used instead of this binary-only program. See Hammerhead/Protocol for details and the latest status.

Contents

[edit] Quick test (driver output to console) on Neo1973 Phase 1

Main article: Getting GPS console output with gllin

To get the output of this driver, read the file /tmp/nmeaNP (it is actually a pipe, not a file). The simplest way is to open another ssh connection to the phone and use cat:

cat /tmp/nmeaNP

This way it is possible to see the first results very easily.

[edit] The "GPS Sight" program with graphic interface

Main article: GPS Sight

There is also a working open source GPS preview program to get the gllin output to the graphical environment. It can immediately show the location, altitude, speed and curved distance from selected point. This program can also draw the covered path (no background map).

[edit] The old program in /home/root/DM2/gps

Main article - Phase 1 GPS driver

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] Bluetooth GPS

He also succeeded at getting the Neo1973 to act like a bluetooth GPS with the following script: (Note that this script has bad problems if you run it more than once. You can get a "time traveling GPS" effect, with the GPS showing you your past position).

#!/bin/sh
killall rfcomm tail
mknod /dev/rfcomm0 c 216 0
echo 1 > /sys/devices/platform/s3c2410-i2c/i2c-0/0-0008/gta01-pm-bt.0/power_on
sleep 1
hciconfig hci0 up name linuxgps
sleep 1
sdpd
sleep 1
sdptool add SP
(
        while true; do
        rfcomm listen /dev/rfcomm0 1
        sleep 1
        done
) &
(
        while true; do
            tail -f /tmp/gps.nmea > /dev/rfcomm0
            echo 1 > /sys/class/leds/gta01\:vibrator/brightness
            sleep 1
            echo 0 > /sys/class/leds/gta01\:vibrator/brightness
        done
) &

[edit] Using UDP

gllin sends a udp packet per nmea sentence on port 6000. this is a much cleaner aproach because using files will fill up memory or rootfs (the latter will result in the need for reflashing).

i switch off writing to /tmp/nmeaNP and logging to log/... with

-np
-nmea

the help says that -nmea is the default, fact is that gllin logs nmea sentences into ./log/<date> wich will fill up mem or rootfs for long running tests. the following python script reads the nmea sentences (you need to have python-io installed to get the socket module):

#!/usr/bin/python
import sys
import socket
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.bind(('127.0.0.1', 6000))
while True:
    line = s.recv(1024)
    sys.stdout.write(line)
    sys.stdout.flush()

the program just prints those to stdout but other methods are possible (i feed them into a NMEA parser).

benefits are that both programs can be started and stopped at will. none needs the other. gllin will not terminate if /tmp/nmeaNP is not there or not read from. the `cat /tmp/nmeaNP | gzip > gps.gz` is a useless idea anyway because the files in log/ (current directory) contains the NMEA data already.

[edit] NMEA

The ouput from the binary driver seems to follow the NMEA standard.

Some information about it is available at gpsinformation.org and on Wikipedia.

Personal tools

The Neo1973 device contains an integrated GPS. The particular device is marketed as an AGPS, and there is some discussion available as to what significance that "A" might have.

As of P1, a binary-only program for talking to the the GPS is available in /home/root/DM2/gps, (and presumably, the same binary would function on a P0 device). There is an ongoing effort to write a Free Software program that could be used instead of this binary-only program. See Hammerhead_protocol for details and the latest status.

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

He also succeeded at getting the Neo1973 to act like a bluetooth GPS with the following script: (Note that this script has bad problems if you run it more than once. You can get a "time traveling GPS" effect, with the GPS showing you your past position).

#!/bin/sh
killall rfcomm tail
mknod /dev/rfcomm0 c 216 0
echo 1 > /sys/devices/platform/s3c2410-i2c/i2c-0/0-0008/gta01-pm-bt.0/power_on
sleep 1
hciconfig hci0 up name linuxgps
sleep 1
sdpd
sleep 1
sdptool add SP
(
        while true; do
        rfcomm listen /dev/rfcomm0 1
        sleep 1
        done
) &
(
        while true; do
            tail -f /tmp/gps.nmea > /dev/rfcomm0
            echo 1 > /sys/class/leds/gta01\:vibrator/brightness
            sleep 1
            echo 0 > /sys/class/leds/gta01\:vibrator/brightness
        done
) &


As people develop more sophisticated GPS applications, please note them here.

Here are some ideas for possibilites:

  • Cairo-based mapping
  • Routing
  • Openstreetmap logger, (with voice annotations)

See openstreetmap - this is a page which needs fleshed out to a proper application page.