LFS.py

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#!/usr/local/bin/python
#
#                               Copyright 2005
#                                     by
#                        The Board of Trustees of the
#                     Leland Stanford Junior University.
#                            All rights reserved.
#

__facility__ = "Online"
__abstract__ = "LFS related mnemonics"
__author__   = "Selim Tuvi <stuvi@slac.stanford.edu> SLAC - GLAST LAT I&T/Online"
__date__     = "2005/07/23 00:08:27"
__updated__  = "$Date: 2006/01/09 19:36:46 $"
__version__  = "$Revision: 1.7 $"
__release__  = "$Name: HEAD $"
__credits__  = "SLAC"

import LICOS.copyright_SLAC

from cmdTlmDb import CmdPkg
from FILE     import FswFile, FswFileID
from LICOS.lib.LATconstants import *

DUMP_FSSTAT_MNEMS = [ 'LFSSYSSUNIT', 'LFSSYSSXACT', 'LFSSYSSDEV', 'LFSSYSSDIR',
                      'LFSSYSSFILE', 'LFSSYSSBLKSIZE', 'LFSYSSBLKFREE', 'LFSYSSBLKTOT' ]
SHORT_TIMEOUT = 3
LONG_TIMEOUT  = 30

class LFS(CmdPkg):
  """!\brief LFS telecommand package class

  Provides access to LFS telecommands.
  """
  def __init__(self, db):
    """!\brief LFS constructor.

    \param db  Wrapper database object for the generated module
              containing command and telemetry database classes.
    """
    CmdPkg.__init__(self, db)

  def getLFSstatus(self, unit, device):
    """!\brief Retreive the file system status

    \return a list of mnemonic values
    """
    raise NotImplementedError
    dumpHdlr = TelemetryEvent(cmdDb.getVsc().getDiagHandler(),
                              [ cmdDb.getVsc().getTlmDb().getApidFromName('LLFSSYSLIST')] )
    dumpHdlr.enable()

    # create the 32 bit file ID
    dumpUnit = FswFileID(device=device, directory=0x7f, fileNumber=0)

    self.LFSSYSSTATUS( LFSUNIT     = self.__LFSUNIT(unit),
                       LFSPAD16    = 0,
                       LFSFILEID   = dumpUnit.id())
    status = self.__checkLastCommandStatus()

    plds = dumpHdlr.waitForPayload( DUMP_FSSTAT_MNEMS, timeout = LONG_TIMEOUT )
    dumpHdlr.disable()

    return plds


  def __LFSUNIT(self, realUnit, tranID=0):
    # Actual upload is 4 bits of unit and 12 bits of opaque transaction ID.
    return ( (realUnit & 0xf) << 12 | (tranID & 0xfff) )

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