80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
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/**
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* @file nullf.c
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* @brief Implements a clock servo that always set the frequency offset to zero.
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* @note Copyright (C) 2015 Richard Cochran <richardcochran@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <stdlib.h>
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#include <math.h>
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#include "nullf.h"
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#include "print.h"
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#include "servo_private.h"
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struct nullf_servo {
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struct servo servo;
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};
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static void nullf_destroy(struct servo *servo)
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{
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struct nullf_servo *s = container_of(servo, struct nullf_servo, servo);
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free(s);
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}
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static double nullf_sample(struct servo *servo, int64_t offset,
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uint64_t local_ts, double weight,
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enum servo_state *state)
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{
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if (!offset) {
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*state = SERVO_LOCKED;
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return 0.0;
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}
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if ((servo->first_update && servo->first_step_threshold &&
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servo->first_step_threshold < fabs(offset)) ||
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(servo->step_threshold && servo->step_threshold < fabs(offset))) {
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*state = SERVO_JUMP;
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} else {
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*state = SERVO_UNLOCKED;
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}
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return 0.0;
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}
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static void nullf_sync_interval(struct servo *servo, double interval)
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{
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}
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static void nullf_reset(struct servo *servo)
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{
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}
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struct servo *nullf_servo_create(void)
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{
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struct nullf_servo *s;
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s = calloc(1, sizeof(*s));
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if (!s)
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return NULL;
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s->servo.destroy = nullf_destroy;
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s->servo.sample = nullf_sample;
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s->servo.sync_interval = nullf_sync_interval;
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s->servo.reset = nullf_reset;
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return &s->servo;
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}
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