A C wrote:
Hi everyone,
I read through most of the archives on various discussions on PPS from a
GPS and tried the suggestions listed there but none have seemed to work
in my case.
I am using a Globalsat ET212 GPS SiRF III based receiver module which
was originally used in cellular phone station equipment. It is
configured to emit only $GPRMC at 4800 baud. It has a PPS output
connected to DCD.
The system is a Sun IPX running NetBSD compiled with PPS_SYNC enabled.
The receiver is attached to /dev/ttyb with symlinks of /dev/gps1,
/dev/pps1, and /dev/gpspps1. I downloaded the code for 4.2.6p3. I've
used the program pps-api.c in the util directory of the ntp tarball to
verify that DCD is working. The results show that the kernel PPS is
available:
# ../util/pps-api /dev/gps1
0.000000000 0.000000000 0 0 0.000000000
1313869152.080535506 0.000000000 1 0 -1313869152.080535412
1313869152.080535506 1313869152.960557409 1 1 0.880021903
1313869153.040540311 1313869152.960557409 2 1 -0.079982902
1313869153.040540311 1313869153.920562214 2 2 0.880021903
1313869154.000540116 1313869153.920562214 3 2 -0.079977902
1313869154.000540116 1313869154.880552020 3 3 0.880011904
1313869154.960541921 1313869154.880552020 4 3 -0.079989901
1313869154.960541921 1313869155.840593822 4 4 0.880051901
1313869155.920541727 1313869155.840593822 5 4 -0.079947905
1313869155.920541727 1313869156.800565630 5 5 0.880023903
1313869156.880537532 1313869156.800565630 6 5 -0.079971902
However, ntpd itself doesn't seem to be using the kernel code even
though the NMEA refclock driver is configured for it (at least I hope
it's configured):
I've only just noticed this.
Not by default.
On i386 NetBSD-5.1 my kernel conf has amongst other changes
# options PPS_SYNC
options PPS_SYNC
However I don't know if it applies to your architecture.
David
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