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hwclock: fix order of samples

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In order to trim oldest samples in the regression function, they need to
be sorted in the data arrays from the oldest to newest.
This commit is contained in:
Miroslav Lichvar
2016-11-15 11:26:18 +01:00
parent 7ec048ce7f
commit 5b2caf48dc
1 changed files with 9 additions and 7 deletions
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16
hwclock.c
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@@ -88,8 +88,8 @@ HCL_CreateInstance(void)
HCL_Instance clock;
clock = MallocNew(struct HCL_Instance_Record);
clock->x_data[0] = 0.0;
clock->y_data[0] = 0.0;
clock->x_data[MAX_SAMPLES - 1] = 0.0;
clock->y_data[MAX_SAMPLES - 1] = 0.0;
clock->n_samples = 0;
clock->valid_coefs = 0;
@@ -142,9 +142,9 @@ HCL_AccumulateSample(HCL_Instance clock, struct timespec *hw_ts,
DEBUG_LOG(LOGF_HwClocks, "HW clock reset interval=%f", local_delta);
}
for (i = clock->n_samples; i > 0; i--) {
clock->y_data[i] = clock->y_data[i - 1] - hw_delta;
clock->x_data[i] = clock->x_data[i - 1] - local_delta;
for (i = MAX_SAMPLES - clock->n_samples; i < MAX_SAMPLES; i++) {
clock->y_data[i - 1] = clock->y_data[i] - hw_delta;
clock->x_data[i - 1] = clock->x_data[i] - local_delta;
}
}
@@ -154,8 +154,10 @@ HCL_AccumulateSample(HCL_Instance clock, struct timespec *hw_ts,
/* Get new coefficients */
clock->valid_coefs =
RGR_FindBestRobustRegression(clock->x_data, clock->y_data, clock->n_samples,
1.0e-9, &clock->offset, &raw_freq, &n_runs, &best_start);
RGR_FindBestRobustRegression(clock->x_data + MAX_SAMPLES - clock->n_samples,
clock->y_data + MAX_SAMPLES - clock->n_samples,
clock->n_samples, 1.0e-9, &clock->offset, &raw_freq,
&n_runs, &best_start);
if (!clock->valid_coefs) {
DEBUG_LOG(LOGF_HwClocks, "HW clock needs more samples");