Lines Matching +full:pre +full:- +full:calibration +full:- +full:data
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29 memory-segment. The shared memory-segment is created with owner-only
31 ≥2. Units 0 and 1 are always created with owner-only access for
36 <h4>Structure of shared memory-segment</h4>
37 <pre>struct shmTime {
38 int mode; /* 0 - if valid is set:
41 * 1 - if valid is set:
42 * if count before and after read of data is equal:
58 };</pre>
61 <p>Each second, the value of <code>valid</code> of the shared memory-segment is checked:</p>
65 <p>Each second, <code>valid</code> in the shared memory-segment is checked:</p>
69 <h4>Mode-independent post-processing</h4>
73 <li>The receive time stamp of the SHM data must be in the last 5
74 seconds before the time the data is processed. This helps in weeding
75 out stale data.
90 The SHM driver was fixed (ntp-4.2.5p138) to collect data each second rather than
98 serial data stream and one for the PPS information when
99 available. Receivers with a loose/sloppy timing between PPS and serial data
101 data streams and correlate the serial data with the PPS events.
110 The 5th field is the number of good data samples found. The last 64 will be used by <i>NTPD</i>.
111 The 6th field is the number of sample that didn't have valid data ready.
117 <pre>
131 </pre>
158 <td align="center">1-31</td>
159 <td align="center">-</td>
160 <td align="center">-</td>
161 <td><i>reserved -- do not use</i></td>
169 … <dd>Specifies the time offset calibration factor, in seconds and fraction, with default 0.0.
182 to force long-distance initial jumps. <i>Check</i> the
204 non-public mappings are created as
215 the clock unit. (This value could be hex-decoded as 'NTP0',
226 <p><i>NTPD</i> is started as root on most POSIX-like operating systems
230 clock setup. The actual polling of the clock is done as the run-time
232 create a SHM segment owned by the runtime-user account. The internal