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bit_utility.h File Reference

#include <stdint.h>

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Functions
void	endian_swap (unsigned short &x)
void	endian_swap (unsigned int &x)
unsigned int	get_bits (const uint32_t &word, const unsigned int &offset, const unsigned int &nbits)
	______________________________________________________________________ read bits
bool	test_bit (const uint32_t &word, const unsigned int &bit)
	______________________________________________________________________ check a bit, 1=true, 0=false
unsigned int	bcd2dec (const unsigned int code)
	______________________________________________________________________ BCD to DEC

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Function Documentation

void endian_swap

(

unsigned short &

x

)

[inline]

Definition at line 5 of file bit_utility.h.

{
   x = (x >> 8) |
       (x << 8);
}

void endian_swap

(

unsigned int &

x

)

[inline]

Definition at line 11 of file bit_utility.h.

{
   x = (x >> 24) |
       ((x << 8) & 0x00FF0000) |
       ((x >> 8) & 0x0000FF00) |
       (x << 24);
}

unsigned int get_bits	(	const uint32_t &	word,
		const unsigned int &	offset,
		const unsigned int &	nbits
	)			[inline]

______________________________________________________________________ read bits

Definition at line 36 of file bit_utility.h.

{
   uint32_t mask = 0;
   for (unsigned int i = 0; i < nbits; i++)
      mask = (mask << 1) + 1;
   return (word >> offset) & mask;
}

bool test_bit	(	const uint32_t &	word,
		const unsigned int &	bit
	)			[inline]

______________________________________________________________________ check a bit, 1=true, 0=false

Definition at line 46 of file bit_utility.h.

{
   uint32_t mask=1;
   mask = mask << bit;
   return (word & mask) == mask;
}

unsigned int bcd2dec

(

const unsigned int

code

)

[inline]

______________________________________________________________________ BCD to DEC

Definition at line 55 of file bit_utility.h.

{
  unsigned int dec = 0;
  unsigned int bcd = code;
  int index = 1;
  while(bcd != 0) {
    dec += (bcd & 0xf) * index;
    bcd = bcd >> 4;
    index *= 10;
  }
  return dec;
}

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