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GLAST/LAT > DAQ and FSW > FSW > Doxygen Index > LDT / V0-3-0

Constituent: encdec     Tag: rad750

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BWU.c File Reference

Bit Word Unpacking, where word refers to 32-bit words. More...

#include "LDT/BWU.h"
#include "ffs.h"
#include <stdio.h>

Include dependency graph for BWU.c:

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 Unpacking, where word refers to 32-bit words.

Author:

JJRussell - russell@slac.stanford.edu

   CVS $Id: BWU.c,v 1.1 2006/09/13 17:08:33 russell Exp $

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Function Documentation

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. 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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