60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
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/*
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* Copyright (c) 2023 Andri Yngvason
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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#define NTP_SAMPLE_PERIOD 1000000 // µs
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#define NTP_MIN_SAMPLE_COUNT 3
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#define NTP_SAMPLE_SIZE 16
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struct aml_ticker;
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struct ntp_client;
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typedef void (*ntp_client_ping_fn)(struct ntp_client*, uint32_t t0, uint32_t t1,
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uint32_t t2, uint32_t t3);
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struct ntp_sample {
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int32_t theta;
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uint32_t delta;
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};
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struct ntp_client {
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struct ntp_sample samples[NTP_SAMPLE_SIZE];
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int sample_index;
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int sample_count;
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struct aml_ticker* ping_ticker;
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ntp_client_ping_fn send_ping;
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void* userdata;
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};
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int ntp_client_init(struct ntp_client*, ntp_client_ping_fn send_ping,
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void* userdata);
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void ntp_client_deinit(struct ntp_client*);
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void ntp_client_process_pong(struct ntp_client*, uint32_t t0, uint32_t t1,
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uint32_t t2, uint32_t t3);
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bool ntp_client_get_best_sample(const struct ntp_client* self,
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struct ntp_sample* sample);
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bool ntp_client_translate_server_time(const struct ntp_client* self,
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uint32_t* dst, const uint32_t t);
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