Michael Davidsaver
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85 lines
1.9 KiB
ReStructuredText
85 lines
1.9 KiB
ReStructuredText
.. _ntapi:
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Common Type Definitions
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=======================
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Library of common type definitions. ::
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#include <pvxs/nt.h>
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namespace pvxs { namespace nt { ... } }
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.. toctree::
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:maxdepth: 1
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:caption: Contents:
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ntscalar
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.. note::
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The nt::* factories are expensive. Avoid repeated use with `pvxs::Value::cloneEmpty`.
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.. _time_t:
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time_t
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------
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Commonly used sub-structure to represent a time
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.. doxygenstruct:: pvxs::nt::TimeStamp
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:members:
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**"secondsPastEpoch"**
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Seconds since POSIX epoch of 1 Jan 1970 UTC.
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Note that the EPICS epoch is 631152000 seconds after the POSIX epoch.
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(cf. POSIX_TIME_AT_EPICS_EPOCH in epicsTime.h from EPICS Base)
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**"nanoseconds"**
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Number of nanoseconds since the start of the second.
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.. _alarm_t:
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alarm_t
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-------
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.. doxygenstruct:: pvxs::nt::Alarm
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:members:
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**"severity"**
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Enumeration of 0 - No Alarm, 1 - Minor, 2 - Major, 3 - Invalid.
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The meaning of Minor and Major are contextual and may be different for each PV.
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An Invalid alarm severity means that the value field should not be taken as
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a meaningful represention of eg. the quantity being measured. Typically,
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it reflects the most recent valid value.
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A UI client may change the state of a widget displaying a value which is alarming
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by eg. changing border color.
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**"status"**
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Enumeration providing context to **"severity"** 0 - No Alarm, 1 - Device, 2 - Driver,
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3 - Record, 4 - Database, 5 - Configuration, 6 - Undefined, 7 - Client
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**"message"**
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Arbitrary string describing the condition being alarmed.
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NTEnum
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------
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Container for a scalar value selection from a list of strings.
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.. doxygenstruct:: pvxs::nt::NTEnum
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:members:
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NTNDArray
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---------
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Container for image data used by areaDetector.
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.. doxygenstruct:: pvxs::nt::NTNDArray
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:members:
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NTURI
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-----
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.. doxygenclass:: pvxs::nt::NTURI
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:members:
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