44 lines
1.9 KiB
C
44 lines
1.9 KiB
C
/*************************************************************************\
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* (C) 2014 David Lettier.
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* http://www.lettier.com/
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* EPICS BASE is distributed subject to a Software License Agreement found
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* in file LICENSE that is included with this distribution.
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\*************************************************************************/
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#ifndef EPICSNTP_H
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#define EPICSNTP_H
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#define NTP_TIMESTAMP_DELTA 2208988800ull
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int epicsNtpGetTime(char *ntpIp, struct timespec *now);
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typedef struct
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{
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uint8_t li_vn_mode; // Eight bits. li, vn, and mode.
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// li. Two bits. Leap indicator.
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// vn. Three bits. Version number of the protocol.
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// mode. Three bits. Client will pick mode 3 for client.
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uint8_t stratum; // Eight bits. Stratum level of the local clock.
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uint8_t poll; // Eight bits. Maximum interval between successive messages.
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uint8_t precision; // Eight bits. Precision of the local clock.
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uint32_t rootDelay; // 32 bits. Total round trip delay time.
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uint32_t rootDispersion; // 32 bits. Max error aloud from primary clock source.
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uint32_t refId; // 32 bits. Reference clock identifier.
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uint32_t refTm_s; // 32 bits. Reference time-stamp seconds.
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uint32_t refTm_f; // 32 bits. Reference time-stamp fraction of a second.
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uint32_t origTm_s; // 32 bits. Originate time-stamp seconds.
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uint32_t origTm_f; // 32 bits. Originate time-stamp fraction of a second.
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uint32_t rxTm_s; // 32 bits. Received time-stamp seconds.
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uint32_t rxTm_f; // 32 bits. Received time-stamp fraction of a second.
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uint32_t txTm_s; // 32 bits and the most important field the client cares about. Transmit time-stamp seconds.
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uint32_t txTm_f; // 32 bits. Transmit time-stamp fraction of a second.
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} ntp_packet; // Total: 384 bits or 48 bytes.
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#endif // EPICSNTP_H
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