phc2sys: add option to set slave-master time offset.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>master
parent
a373805b6d
commit
1a83619b17
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@ -24,6 +24,8 @@ phc2sys \- synchronize two clocks
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.BI \-R " update-rate"
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] [
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.BI \-N " clock-readings"
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] [
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.BI \-O " offset"
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]
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.SH DESCRIPTION
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@ -84,6 +86,10 @@ the fastest reading is used to update the slave clock, this is useful to
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minimize the error caused by random delays in scheduling and bus utilization.
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The default is 5.
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.TP
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.BI \-O " offset"
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Specify the offset between the slave and master times in seconds.
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The default is 0 seconds.
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.TP
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.BI \-h
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Display a help message.
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10
phc2sys.c
10
phc2sys.c
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@ -241,6 +241,7 @@ static void usage(char *progname)
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" -I [ki] integration constant (0.3)\n"
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" -R [rate] slave clock update rate in HZ (1)\n"
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" -N [num] number of master clock readings per update (5)\n"
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" -O [offset] slave-master time offset (0)\n"
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" -h prints this message and exits\n"
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"\n",
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progname);
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@ -253,12 +254,12 @@ int main(int argc, char *argv[])
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clockid_t src = CLOCK_INVALID, dst = CLOCK_REALTIME;
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uint64_t phc_ts;
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int64_t phc_offset;
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int c, phc_readings = 5, phc_rate = 1;
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int c, phc_readings = 5, phc_rate = 1, sync_offset = 0;
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/* Process the command line arguments. */
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progname = strrchr(argv[0], '/');
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progname = progname ? 1+progname : argv[0];
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while (EOF != (c = getopt(argc, argv, "c:d:hs:P:I:R:N:i:"))) {
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while (EOF != (c = getopt(argc, argv, "c:d:hs:P:I:R:N:O:i:"))) {
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switch (c) {
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case 'c':
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dst = clock_open(optarg);
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@ -281,6 +282,9 @@ int main(int argc, char *argv[])
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case 'N':
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phc_readings = atoi(optarg);
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break;
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case 'O':
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sync_offset = atoi(optarg);
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break;
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case 'i':
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ethdev = optarg;
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break;
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@ -311,6 +315,7 @@ int main(int argc, char *argv[])
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struct timespec now;
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if (clock_gettime(src, &now))
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perror("clock_gettime");
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now.tv_sec += sync_offset;
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if (clock_settime(dst, &now))
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perror("clock_settime");
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}
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@ -323,6 +328,7 @@ int main(int argc, char *argv[])
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if (!read_phc(src, dst, phc_readings, &phc_offset, &phc_ts)) {
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continue;
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}
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phc_offset -= sync_offset * NS_PER_SEC;
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do_servo(&servo, dst, phc_offset, phc_ts, kp, ki);
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show_servo(stdout, "phc", phc_offset, phc_ts);
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}
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