Dirk Zimoch
90a727c901
Most errors found with: codespell -L cach,thst,odly,aslo,parm,parms,inpu,ges,prset,pevent,ptd,pring,valu,noo,noe,ned,inout,ro,siz,froms,nd,fo,singl,sart,multy,tthe,allong,ment,inate,nodel,tring,alse,ture,thi,wille,numer Some more manually found (its -> it's) c++20: Do not use apostrophe (e.g. can't) in unquoted #error message
66 lines
3.3 KiB
Markdown
66 lines
3.3 KiB
Markdown
# Release Notes
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This document describes the changes that were included in the release of EPICS
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noted below. Release entries are now provided in a separate document for each
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version in the EPICS 7 series, but all are combined into a single page for
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publishing on the EPICS website. Separate release documents are also included
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from the older Base 3.15 and 3.16 series.
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## EPICS Release 7.0.1.1
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### Changed SIML failure behavior
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A failure when fetching the simulation mode through `SIML` will not put the
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record into INVALID alarm state anymore. Instead, as long as the record's
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current alarm severity (`SEVR`)is `NO_ALARM`, its alarm status (`STAT`) will be
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set to `LINK_ALARM` without increasing the severity. This allows clients to get
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some notification of a failing or bad `SIML` link without otherwise affecting
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record processing.
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### `dbVerify()` has been restored to dbStaticLib
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This routine was removed in Base-3.16.1 but has been reimplemented in this
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release by special request. Note that the error message strings that it
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returns when verification fails have changed, but are still designed for
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display to the user.
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### Simulation mode improvements
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Records that support simulation mode have two new fields, `SSCN` (Simulation
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Scan Mode) and `SDLY` (Simulation Delay). `SSCN` is a menu field that provides
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an alternate value for the `SCAN` field to be used while the record is in
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simulation mode. This is especially useful for I/O scanned records, for which
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simulation mode was not working at all. Setting `SDLY` to a positive value
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makes the record process asynchronously in simulation mode, with the second
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stage processing happening after the specified time (in seconds).
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### Extend the dbServer API with init/run/pause/stop methods
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This change permits IOCs to be built that omit the CA server (RSRV) by
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removing its registrar entry which is now provided in the new `rsrv.dbd` file.
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Other server layers can be built into the IOC (alongside RSRV or in place of
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it) by registering them in a similar manner. The dbServer API is documented
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with Doxygen comments in the header file.
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Specific IOC server layers can be disabled at runtime by adding their name to
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the environment variable `EPICS_IOC_IGNORE_SERVERS` (separated by spaces if more
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than one should be ignored).
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### Grand source-code reorganization
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EPICS 7.0.1 contains the IOC Database, RSRV server and the Channel Access
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client code from EPICS Base 3.16.1 along with all the original record types
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and soft device support, but GDD and the Portable Channel Access Server have
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been unbundled and are now available separately. In their place we have
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brought in the more recently written EPICS V4 C++ libraries (collectively
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referred to as the PVA modules). The directory tree for EPICS is somewhat
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larger as a result, and the original structure of the Base directories has
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been split into 4 separate Git repositories. External modules should build
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against this new structure with little or no changes needed, except that some
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allowance may be needed for the merging of the V4 modules.
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There should be rather more description and documentation of these changes
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than is currently available, but as developers we generally much prefer to
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write code than documentation. Send questions to the tech-talk mailing list
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and we'll be happy to try and answer them!
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