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[/] [qaz_libs/] [trunk/] [cli/] [util/] [util_bits.c] - Rev 22

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/*-----------------------------------------------------------*/
 
#include "util_bits.h"
 
 
/*-----------------------------------------------------------*/
void inline 
  util_set_bits
  (
    unsigned int address, 
    unsigned int bit_offset, 
    unsigned int bit_mask, 
    unsigned int data
  )
{
  volatile unsigned int *word_pointer = (volatile unsigned int *)(address);
  unsigned int buffer;
 
  data <<= bit_offset;
  data &= bit_mask;
 
  buffer = *word_pointer;
  buffer &= ~bit_mask;
  buffer |= data;
 
  *word_pointer = buffer;
}
 
 
/*-----------------------------------------------------------*/
unsigned int inline 
  util_get_bits
  (
    unsigned int address, 
    unsigned int bit_offset, 
    unsigned int bit_mask
  )
{
  volatile unsigned int *word_pointer = (volatile unsigned int *)(address);
  unsigned int buffer;
 
  buffer = *word_pointer;
  buffer &= bit_mask;
  buffer >>= bit_offset;
 
  return(buffer);
}
 
 
/*-----------------------------------------------------------*/
unsigned char ReverseBits7ops32bit(unsigned char v)
{
    return ((v * 0x0802LU & 0x22110LU) |
            (v * 0x8020LU & 0x88440LU)) * 0x10101LU >> 16;
}
 
 
 
 

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