Ron Frazier (NTP) wrote:
Hi all,
I have recently been posting messages about my experience trying to
install a USB GPS and wring out the maximum performance in Windows.
Now I need help doing the same thing in Linux. I want to install the
GPS using only NTPD if possible, without GPSD, to make my install
configuration as close as possible to the way it's set up in Windows.
Please let me know if I'm on track or not and why my GPS is not working,
if possible.
I'm running Ubuntu 11.04 and had already installed NTP version
1.4.2.6.p2 from the Ubuntu Natty repositories. That runs fine, polling
from the internet.
I plugged in the USB GPS and it appeared as /dev/ttyUSB0. I used the
following configuration line to set up the port:
From: http://www.satsignal.eu/ntp/Sure-GPS.htm
I used: stty -F /dev/ttyUSB0 57600 igncr clocal -echo -ixon
Then, I used the following command to set up a symlink to the port:
ln -T /dev/ttyUSB0 /dev/gps1 (Actually, I tried gps5 first.)
Then, I did cat /dev/gps1 and got the following:
ron@asus-k52f-1:/etc$ cat /dev/gps1
$GPZDA,011724.000,11,02,2012,,*54
$GPZDA,011725.000,11,02,2012,,*55
$GPZDA,011726.000,11,02,2012,,*56
$GPZDA,011727.000,11,02,2012,,*57
$GPZDA,011728.000,11,02,2012,,*58
$GPZDA,011729.000,11,02,2012,,*59
$GPZDA,011730.000,11,02,2012,,*51
$GPZDA,011731.000,11,02,2012,,*50
So, I know the port is working and I know the GPS is putting out data.
Before editing the ntp.conf file, I stopped the service using:
sudo /etc/init.d/ntp stop
These are the GPS lines in /etc/ntp.conf:
server 127.127.20.1 prefer minpoll 3 maxpoll 3 mode 72
fudge 127.127.20.1 time2 0.3000 refid GPS1
last year I played around with the Sure Board.
see http://wiki.tcl.tk/28358
for me the mode keyword did not work the way it was supposed.( baudrate wise )
check what the baudrate is after ntp has started.
Look in the log : /var/log/messages or /var/log/ntp/* for errors.
I am running on SuSE, log destination tend to vary over distributions.
uwe
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