Hi, I'm unable to have 1us precision with Sure GPS card and NTP :
_ ubuntu 12.04 LTS / Kernel 3.2 _ SURE GPS : http://www.satsignal.eu/ntp/Sure-GPS.htm (PPS modifications done) - ntp atched with timepps.h (but i'm not sure it's work) 09.pps.rules : KERNEL=="ttyS0", SYMLINK+="gps0" KERNEL=="ttyS0", RUN+="/bin/setserial -v /dev/%k low_latency" KERNEL=="ttyS0", RUN+="/usr/sbin/ldattach pps /dev/%k" KERNEL=="pps0", OWNER="root", GROUP="tty", MODE="0660", SYMLINK+="gpspps0" etc/apparmor.d/tunables/ntpd : @{NTPD_DEVICE}="/dev/ttyS0 server 127.127.20.0 iburst minpoll 4 prefer mode 18 fudge 127.127.20.0 flag1 1 flag2 0 # time1: PPS time offset # time2: Serial end-of-line time offset # flag1: PPS enable # flag2: PPS direction (0 == rising edge, 1 == falling edge) # flag3: Use kernel PPS clock discipline # flag4: Obscure location in timecode offet : 30ms (30100µS) jitter 10ms (10000µs) ppstest works but i don't understant with i can't get 1µs precision as if PPS kernel mode doesn't work please help !!!! i'm a newbie and i need 1PPS and 1/10µs presision with linux and GPS sure electronics Board. Thanks _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
