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document info(Q:time:tag, ...)

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Michael Davidsaver
2018-04-06 15:29:14 -07:00
parent 26d369c042
commit 19602bb06d
2 changed files with 24 additions and 1 deletions
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2
documentation/mainpage.h
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@ -10,7 +10,7 @@ runs inside an EPICS IOC process and allows clients
to make requests to access the Process Variables (PVs)
within.
Configuration of @ref qsrv_group_def.
Documentation of @ref qsrv_config including @ref qsrv_group_def.
@subsection qsrv_build Building

23
documentation/qsrvpage.h
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@ -118,4 +118,27 @@ values/meta-data of all fields.
It may be useful to specify a comma seperated list of field names
so that changes may partially update the group.
@subsection qsrv_stamp QSRV Timestamp Options
QSRV has the ability to perform certain transformations on the timestamp before transporting it.
The mechanism for configuring this is the "Q:time:tag" info() tag.
@subsubsection qsrv_stamp_nslsb Nano-seconds least significant bits
Setting "Q:time:tag" to a value of "nsec:lsb:#", where # is a number between 0 and 32,
will split the nanoseconds value stored in the associated record.
The least significant # bits are stored in the 'timeStamp.userTag' field.
While the remaining 32-# bits are stored in 'timeStamp.nanoseconds' (without shifting).
For example, in the following situation 16 bits are split off.
If the nanoseconds part of the record timestamp is 0x12345678,
then the PVD structure would include "timeStamp.nanoseconds=0x12300000"
and "timeStamp.userTag=0x45678".
@code
record(ai, "...") {
info(Q:time:tag, "nsec:lsb:20")
}
@endcode
*/