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refclock: add local option

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Add "local" option to specify that the reference clock is an
unsynchronized clock which is more stable than the system clock (e.g.
TCXO, OCXO, or atomic clock) and it should be used as a local standard
to stabilize the system clock.

Handle the local refclock as a PPS refclock locked to itself which gives
the unsynchronized status to be ignored in the source selection. Wait
for the refclock to get at least minsamples samples and adjust the clock
directly to follow changes in the refclock's sourcestats frequency and
offset.

There should be at most one refclock specified with this option.
This commit is contained in:
Miroslav Lichvar
2022-02-22 11:24:00 +01:00
parent af6ae9186b
commit 62757cda49
5 changed files with 110 additions and 3 deletions
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7
conf.c
View File

@@ -861,7 +861,7 @@ static void
parse_refclock(char *line)
{
int n, poll, dpoll, filter_length, pps_rate, min_samples, max_samples, sel_options;
int max_lock_age, pps_forced, stratum, tai;
int local, max_lock_age, pps_forced, stratum, tai;
uint32_t ref_id, lock_ref_id;
double offset, delay, precision, max_dispersion, pulse_width;
char *p, *cmd, *name, *param;
@@ -871,6 +871,7 @@ parse_refclock(char *line)
poll = 4;
dpoll = 0;
filter_length = 64;
local = 0;
pps_forced = 0;
pps_rate = 0;
min_samples = SRC_DEFAULT_MINSAMPLES;
@@ -929,6 +930,9 @@ parse_refclock(char *line)
if (sscanf(line, "%d%n", &filter_length, &n) != 1) {
break;
}
} else if (!strcasecmp(cmd, "local")) {
n = 0;
local = 1;
} else if (!strcasecmp(cmd, "rate")) {
if (sscanf(line, "%d%n", &pps_rate, &n) != 1)
break;
@@ -995,6 +999,7 @@ parse_refclock(char *line)
refclock->driver_poll = dpoll;
refclock->poll = poll;
refclock->filter_length = filter_length;
refclock->local = local;
refclock->pps_forced = pps_forced;
refclock->pps_rate = pps_rate;
refclock->min_samples = min_samples;