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GLAST/LAT > DAQ and FSW > FSW > Doxygen Index > LDT / V0-4-0

Constituent: encdec     Tag: rad750

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BWU.h File Reference

Bit Word interface definitions, unpacking specific routines. More...

#include "LDT/BW.h"

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Functions
unsigned int	BWU_expand (unsigned int wrd, unsigned int msk)
	Expands wrd according to the bits set in msk. This is the inverse operation of BWP_collapse.
unsigned int	BWU_revert (unsigned int wrd, unsigned int nwrd, unsigned int nexp)
	Reverts wrd to the original integer. This is the inverse operation of BWP_convert.

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Detailed Description

Bit Word interface definitions, unpacking specific routines.

Author:

JJRussell - russell@slac.stanford.edu

   CVS $Id: BWU.h,v 1.1 2006/09/13 17:09:08 russell Exp $

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Function Documentation

unsigned int BWU_expand	(	unsigned int	msk,
		unsigned int	wrd
	)

Expands wrd according to the bits set in msk. This is the inverse operation of BWP_collapse.

Returns:

The expanded word

Parameters:

	wrd	The mask to control the expansion
	msk	The word to expand

For each cleared bit encountered in msk, a 0 is placed into the equivalent bit position in the output word. For each set bit in msk, the value of the next available bit is pulled from the top of wrd and inserted into the equivalent bit position in the output word. Here equivalent bit position means the same bit position as in msk.

Example

        msk = 0x001101110;
        wrd = 0x1011;

    Expand wrd where the 0's in msk are
        out = 0x001001100;

    If one collapsed out
        msk = 0x001101110;
        out = 0x001001100;
        wrd = 1011;

unsigned int BWU_revert	(	unsigned int	wrd,
		unsigned int	nwrd,
		unsigned int	nexp
	)

Reverts wrd to the original integer. This is the inverse operation of BWP_convert.

Returns:

The revert word

Parameters:

	wrd	The word to expand
	nwrd	The bit field width of the expanded word
	nexp	The number of bits in the exponent.

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