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v_compute_scet.pro
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v_compute_scet.pro
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function v_compute_scet, $
val1, val2, val3
;+ $Id: v_compute_scet.pro,v 1.8 2010/09/27 15:11:00 erard Exp $
;
; NAME:
; v_compute_scet
;
; PURPOSE:
; The SCET values located in the PDS suffix are stored into 3 words of 2 bytes each
; This function compte a SCET value given those 3 words
;
; CALLING SEQUENCE:
; Result=v_compute_scet(val1, val2, val3)
;
; INPUTS:
; val1 = Most significant word
; val2 = Middle word
; val3 = Least significant word
;
; OUTPUTS:
; Result = The SCET (SpaceCraft Elapsed Time)
;-
;
;###########################################################################
;
; LICENSE
;
; Copyright (c) 1999-2008, StŽphane Erard, CNRS - Observatoire de Paris
; All rights reserved.
; Non-profit redistribution and non-profit use in source and binary forms,
; with or without modification, are permitted provided that the following
; conditions are met:
;
; Redistributions of source code must retain the above copyright
; notice, this list of conditions, the following disclaimer, and
; all the modifications history.
; Redistributions in binary form must reproduce the above copyright
; notice, this list of conditions, the following disclaimer and all the
; modifications history in the documentation and/or other materials
; provided with the distribution.
; Neither the name of the CNRS and Observatoire de Paris nor the
; names of its contributors may be used to endorse or promote products
; derived from this software without specific prior written permission.
;
; THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
; DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
; (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;
scet = replicate(double('FFFF'X), n_elements(val1))
valid = where(val1 ne 'FFFF'X)
if (valid[0] eq -1) then return, scet
scet[valid] = ulong(val1[valid]) * 2D^16D
scet[valid] += ulong(val2[valid])
scet[valid] += double(double(val3[valid]) / 2D^16D)
return, scet
end