stats.c

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#include "stats.h"
 
#include <memory.h>
#include <math.h>
 
#include "event.h"
#include "ptp_core.h"
#include "ptp_defs.h"
#include "settings_interface.h"
 
 
#define S (gPtpCoreState)
 
// clear statistics
void ptp_clear_stats() {
    memset(&S.stats, 0, sizeof(PtpStats));
    S.stats.filtTimeErr = 100 * PTP_ACCURACY_LIMIT_NS; // prevent strange LOCKED-UNLOCKED-LOCKED series when starting up
}
 
// get statistics
const PtpStats* ptp_get_stats() {
    return &S.stats;
}
// filter parameters for statistics calculation
// WARNING: Data calculation won't be totally accurate due to unvertain sampling time!
 
#define PTP_TE_FILT_Fc_HZ (0.1) 
 
// collect statistics
void ptp_collect_stats(int64_t d) {
    double a = exp(-PTP_TE_FILT_Fc_HZ * 2 * M_PI * (S.slave.messaging.syncPeriodMs / 1000.0));
 
    // performing time error filtering
    double y_prev = S.stats.filtTimeErr, y;
    y = a * y_prev + (1 - a) * d; // filtering equation
    S.stats.filtTimeErr = y;
 
    // set locked state
    bool locked = ((fabs(S.stats.filtTimeErr) < (PTP_ACCURACY_LIMIT_NS)) && (ptp_get_current_master_clock_identity() != 0));
    CLILOG(S.logging.locked && (locked != S.stats.locked), "PTP %s!\n", locked ? "LOCKED" : "DIVERGED");
    
    // invoke LOCKED/UNLOCKED event
    if (locked != S.stats.locked) {
        PTP_IUEV(locked ? PTP_UEV_LOCKED : PTP_UEV_UNLOCKED);
    }
 
    S.stats.locked = locked;
}