檢視Application - u-blox NEO-6M, GPS module的原始碼

[[File:Rpi gps.png|thumb|200px|RPi2 with GPS module(u-blox NEO-6M)]]
[[File:Rpi gpio.png|thumb|200px|RPi2 GPIO]]
== HW connection ==
<pre>
PRi2       --  u-blox NEO-6M
VCC        --  VCC(3v3 / 5V) 
TX(GPIO8)  --  Rx
Rx(GPIO10) --  Tx
Gnd        --  Gnd

or

CP2102 --  u-blox NEO-6M
VCC    --  VCC(3v3 / 5V) 
TX     --  Rx
Rx     --  Tx
Gnd    --  Gnd
</pre>

== Software ==
*Install raspbian
*Install tools
**scons-2.3.4
**gpsd-3.14
**sudo apt-get install scons libncurses5-dev python-dev pps-tools python-gobject  python-gtks-dev
**sudo apt-get install gpsd gpsd-clients python-gps
*TTY issue
**RPi dominate /dev/ttyAMA0 as default serial console
**Vi /etc/inittab 
<pre>

#Spawn a getty on Raspberry Pi serial line
T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100

to:

#Spawn a getty on Raspberry Pi serial line
#T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100
</pre>
**Vi /boot/cmdline.txt
***Remove “console=ttyAMA0,115200 kgdboc=ttyAMA0,115200”
***And, it would be looks like, 
****dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait
*Notes
** If your gpsd controled by systemctl
** edit /etc/default/gpsd and modify the DEVICES as you want
<pre>
# Default settings for gpsd.
# Please do not edit this file directly - use `dpkg-reconfigure gpsd' to
# change the options.
START_DAEMON="true"
GPSD_OPTIONS=""
DEVICES="/dev/ttyAMA0"
USBAUTO="true"
GPSD_SOCKET="/var/run/gpsd.sock"
</pre>
**It only starts working after gpsd attempts 4800, 9600, 19200 then finally 38400
**Solved by 
***stty speed 115200 </dev/ttyAMA0
*Run
**sudo gpsd /dev/ttyUSB0 -F /var/run/gpsd.sock

== Result ==
[[File:Gps 01.png|thumb|xgps]]
[[File:Gps 02.png|thumb|cgps]]
<pre>
First, you need to run gpsd with ur GPS module 
connected by TTY serial, gpsd /dev/ttyAMA0
connected by USB, gpsd /dev/ttyUSB0










</pre>

== Grab geo info by gpspipe ==
<pre>
#!/bin/bash
gpsdata=$( gpspipe -w -n 10 |   grep -m 1 lon )
lat=$( echo "$gpsdata"  | jsawk 'return this.lat' )
lon=$( echo "$gpsdata"  | jsawk 'return this.lon' )
echo "You are here: $lat, $lon - https://maps.google.com/maps?q=$lat,+$lon"
</pre>

== Reference ==
* [https://www.microduino.cc/wiki/index.php?title=Microduino-NEO-6M, Microduino-NEO-6M]
* [https://learn.adafruit.com/adafruit-ultimate-gps-on-the-raspberry-pi/using-uart-instead-of-usb, Using UART instead of USB]
* [http://www.catb.org/gpsd/installation.html, GPSD Installation Instructions]
* [http://raspberry.piaustralia.com.au/pages/using-the-raspberry-pi-model-b-with-itead-studio-rpi-gps-add-on, Using the Raspberry Pi Model B with ITead Studio RPi GPS Add-on]
* [http://thomasloughlin.com/gpspipe-gps-client/, Using GPSPIPE as a Client or Logger for GPSD]

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