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refclock: add option to filter wrong pulse edges

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Add width option to the refclock directive to set expected width of
pulses in a PPS signal. The width adds a limit for the maximum offset
and root distance in order to reject PPS samples from wrong events, e.g.
PHCs which cannot be configured to timestamp only rising of falling
edges.
This commit is contained in:
Miroslav Lichvar
2017-05-19 18:51:03 +02:00
parent eceb8d9937
commit 1ca099473f
3 changed files with 36 additions and 1 deletions
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7
conf.c
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@@ -676,7 +676,7 @@ parse_refclock(char *line)
int n, poll, dpoll, filter_length, pps_rate, min_samples, max_samples, sel_options;
int max_lock_age, pps_forced;
uint32_t ref_id, lock_ref_id;
double offset, delay, precision, max_dispersion;
double offset, delay, precision, max_dispersion, pulse_width;
char *p, *cmd, *name, *param;
unsigned char ref[5];
RefclockParameters *refclock;
@@ -693,6 +693,7 @@ parse_refclock(char *line)
delay = 1e-9;
precision = 0.0;
max_dispersion = 0.0;
pulse_width = 0.0;
ref_id = 0;
max_lock_age = 2;
lock_ref_id = 0;
@@ -766,6 +767,9 @@ parse_refclock(char *line)
} else if (!strcasecmp(cmd, "maxdispersion")) {
if (sscanf(line, "%lf%n", &max_dispersion, &n) != 1)
break;
} else if (!strcasecmp(cmd, "width")) {
if (sscanf(line, "%lf%n", &pulse_width, &n) != 1)
break;
} else if (!strcasecmp(cmd, "noselect")) {
n = 0;
sel_options |= SRC_SELECT_NOSELECT;
@@ -804,6 +808,7 @@ parse_refclock(char *line)
refclock->delay = delay;
refclock->precision = precision;
refclock->max_dispersion = max_dispersion;
refclock->pulse_width = pulse_width;
refclock->ref_id = ref_id;
refclock->max_lock_age = max_lock_age;
refclock->lock_ref_id = lock_ref_id;