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Stream Device 2.x

Stream Device 2.x. A device driver for byte stream oriented I/O. asynDriver. GPIB. CAN. RS232. What was Stream Device again?. records. ai. bo. stringout. waveform. record interfaces. Stream Device kernel. protocol files. bus interfaces. bus drivers. Proven Features.

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Stream Device 2.x

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  1. Stream Device 2.x A device driver for byte stream oriented I/O

  2. asynDriver ... GPIB CAN RS232 What was Stream Device again? ... records ai bo stringout waveform record interfaces Stream Device kernel protocol files bus interfaces bus drivers

  3. Proven Features • Plain text config file (protocol file) • No C coding necessary to support new devices • Modular design • Support for all standard I/O record types • ai, ao, bi, bo, mbbi, mbbo, mbbiDirect, mbboDirect, longin, longout, stringin, stringout, waveform • other record types easy to implement • Independent of underlying I/O hardware

  4. New Features • EPICS R3.14.6 compatible • Runs on a PC as well as on vxWorks • Support for asynDriver • Generic serial line, GPIB, and network driver included • Stream Device and other software can talk to the same device without interference. • Lots of protocol extensions

  5. New Protocol Features • Exception handlers • E.g. init handler (used in init_record) • Sub-protocols (use one protocol in an other one) • More protocol variables • E.g. minimal and maximal input length • User defined variables • Direct access to record fields

  6. user variable sub-protocol exception handlers Examples • Handlers, variables, sub-protocols terminator = CR LF; F = "FREQ"; read_freq { out $F "?"; in "%f"; @readError { out "RESET"; } } set_freq { out $F " %.9f"; @init { read_freq; } }

  7. Format converter modules • Standard formats (%f %x %[a-z] …) • Additional formats (%b %D %{s0|s1|s2} …) • New formats can be implemented easily • e.g. regular expression: %/regexp/ • User functions as pseudo-formats • e.g. checksum as %@ • encode after format, decode before scan

  8. Examples • Formats, field access, user functions read_strange_status_bits { out "stat?"; in "%12B.!";}access_record_fields { out "%(A).3f, %(B)g, %(C)d, %(DESC)s"; in "%f%(EGU)s";}apply_user_function { in "A=%d%@";}

  9. Some Gimmicks • Reload protocols without reboot • dbior shows all used protocols • Support for calcout record • Memory tracing to find leaks • Dynamically allocated buffers • don't care about buffer sizes • implemented with new StreamBuffer class

  10. StreamBuffer Class • Used for all buffers in Stream Device • Transparently uses static or allocated memory • Implements appending, deleting, replacing of bytes or strings, and memory management in an efficient way • Implements printf to append formatted values • Can be used by other software as well

  11. Where to get Stream Device 2.x • Pre-release available from dirk.zimoch@psi.ch • Might be instable (testers welcome) • No complete documentation yet • but Stream Device 1.x documentation helps:www.delta.uni-dortmund.de/controls

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