{{tag>[hardware gps versalogic centos apu]}}
{{:pd0b-ip5_img_1397.jpg?nolink&600|PC Engines APU and Versalogic GPS}}


=====Versalogic VL-MPEu-G2 GPS=====

====Documentation====
  * {{::mmpeug2.pdf|VL-MPEu-G2 Reference Manual}}
  * {{::neo-7_datasheet_gps.g7-hw-11004_.pdf|Neo-7 Data Sheet}}
  * {{::u-blox7-v14_receiverdescriptionprotocolspec_public_gps.g7-sw-12001_.pdf|u-blox 7 Receiver Description: Including Protocol Specification V14}}

====Configuration for CentOS 6.5====
  * Install the VL-MPEu-G2 module.
  * Start the PC Engines APU.
  * Test serial data. <code>stty -F /dev/ttyACM0 ispeed 4800 && cat </dev/ttyACM0

$GPTXT,01,01,02,u-blox ag - www.u-blox.com*50
$GPTXT,01,01,02,HW  UBX-G70xx   00070000 EFFFFFFFo*1B
$GPTXT,01,01,02,EXT CORE 1.00 (59843) Jun 27 2012 18:25:33*49
$GPTXT,01,01,02,ROM BASE 1.00 (59842) Jun 27 2012 17:43:52*57
$GPTXT,01,01,02,MOD NEO-7N-0*26
$GPTXT,01,01,02,PROTVER 14.00*1E
$GPTXT,01,01,02,ANTSUPERV=AC SD PDoS SR*20
$GPTXT,01,01,02,ANTSTATUS=OK*3B
$GPTXT,01,01,02,FIS 0xBF2601 found*2E
$GPTXT,01,01,02,LLC FFFFFFFF-FFFFFFED-FFFFFFFF-FFFFFFFF-FFFFFF69*20
$GPRMC,173337.00,A,5150.86536,N,00420.44234,E,0.203,,190614,,,A*74
$GPVTG,,T,,M,0.203,N,0.376,K,A*20
$GPGGA,173337.00,5150.86536,N,00420.44234,E,1,04,7.34,15.3,M,46.0,M,,*63
$GPGSA,A,3,16,31,27,21,,,,,,,,,11.98,7.34,9.48*35
$GPGSV,3,1,11,03,16,279,21,05,04,022,,07,07,337,12,16,66,287,44*7F
$GPGSV,3,2,11,18,28,130,23,19,08,268,,21,69,093,30,22,08,163,16*7A
$GPGSV,3,3,11,27,39,275,31,29,20,086,,31,08,200,31*49
$GPGLL,5150.86536,N,00420.44234,E,173337.00,A,A*67</code>
====Install GPSd====
  * Install prerequisite packages. <code>yum install chrpath scons libxslt-devel ncurses-devel asciidoc python-devel</code>
  * Download source code from: [[https://savannah.nongnu.org/projects/gpsd/]]
  * Extract. <code>tar zxvf gpsd-3.10.tar.gz</code>
  * Compile. <code>cd gpsd-3.10
scons prefix=/opt/gpsd
sudo scons udev-install
</code>
  * Test gpsd. <code>gpsd -D 5 -N -n /dev/ttyACM0</code>

====/etc/ntp.conf====
<code># Allow more distance between GPS (USB) and Serial PPS.
# Stratum level 12 when no ref source available
tos mindist 0.010 orphan 12

driftfile /var/lib/ntp/ntp.drift

statsdir /var/log/ntpstats/

statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable

# Local servers
server ntp1.polaire.nl
server ntp2.polaire.nl
server ntp3.home.polaire.nl

# ATOM PPS (/dev/pps0)
server 127.127.22.0 minpoll 4 maxpoll 4
fudge  127.127.22.0 refid PPS

# GPS (USB /dev/ttyACM0)
server 127.127.28.0 minpoll 4 maxpoll 4 prefer
fudge 127.127.28.0 refid GPSd
fudge 127.127.28.0 time1 0.065

# By default, exchange time with everybody, but don't allow configuration.
restrict -4 default kod notrap nomodify nopeer noquery
restrict -6 default kod notrap nomodify nopeer noquery

# Local users may interrogate the ntp server more closely.
restrict 127.0.0.1
restrict ::1</code>