Hi, Ok today my friend Henk (Henk are you still subscribed here?) soldered the raspberry pi on my adafruit ultimate gps breakout v3. Apart from the soldering things were totally easy to get to work: only a few tweaks to cmdline.txt and inittab and the serial data streamed in. I decided _not_ to patch the kernel after a couple of issues with missing include files and such. But as only "watching" the nmea stream gives bad results, I needed to find an alternative for the PPS signal. So I wrote a little program which watches the GPIO port using poll (which waits for an interrupt) and then pokes in the shared memory segment of ntpd.
After 51 minutes of ntpd run-time this gives: remote refid st t when poll reach delay offset jitter ============================================================================== *firewall.intran 192.168.64.2 3 u 7 64 377 0.560 -0.506 0.493 -belle.intranet. 192.168.64.2 3 u 58 64 377 0.560 -0.470 0.405 -time2.intranet. 194.109.20.18 3 u 56 64 377 1.034 -1.282 1.392 +auth1.xs4all.nl 193.67.79.202 2 u 28 64 377 17.580 -0.160 0.490 xSHM(0) .NMEA. 0 l 1 16 377 0.000 -359.47 10.670 +SHM(1) .PPS. 0 l 1 8 377 0.000 2.964 0.061 I started the program with statistics logging enabled so I will produce some nice graphs after a day or so. Folkert van Heusden -- Feeling generous? -> http://www.vanheusden.com/wishlist.php ---------------------------------------------------------------------- Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.