bitroutines.c

这是一个c＋＋编写的WCDMA链路采用RAKE接收的方针源代码

/*
 |
 | Copyright disclaimer:
 |   This software was developed at the National Institute of Standards
 |   and Technology by employees of the Federal Government in the course
 |   of their official duties. Pursuant to title 17 Section 105 of the
 |   United States Code this software is not subject to copyright
 |   protection and is in the public domain.
 |
 |   We would appreciate acknowledgement if the software is used.
 |
*/

/* 
 | Project:     WCDMA simulation environment
 | Module:      Bit manipulation routines
 | Author:      Tommi Makelainen, NIST
 | Date:        January 6, 1999
 |
 | History:
 |              January 6, 1999 Tommi Makelainen
 |                      Initial version.
 |
 */

#include "bitroutines.h"

/* -------------------------------------------------------------------- */
/*
 * Function:    extract_bit_from_byte
 * Desc.:       Extract given single bit value from a given byte.
 *
 * Inputs:
 *   byte       input byte
 *   pos        bit position (7-0) 7 = leftmost, 0 = bit on the right
 * Returns:
 *              bit value (0 or 1)
 *
 * Note:
 */
char extract_bit_from_byte(char byte, int pos)
{
    int i;
    char bit;

    bit = 0;
    bit = (byte >> pos) & 0x1;

    return (bit);
}

/* -------------------------------------------------------------------- */
/*
 * Function:    set_bit_in_byte
 * Desc.:       Set a value of a single bit 'bit' in given
 *              position 'pos' in a byte 'byte'.
 *
 * Inputs:
 *   bit        input bit value
 *   pos        bit position to set
 * Outputs:
 *   byte       modified byte
 *
 * Note:
 */
int set_bit_in_byte(char bit, int pos, char *byte)
{
    char temp_byte;

    temp_byte = 0;
    temp_byte = (bit << pos);
    *byte |= temp_byte;

    return(0);
}

/* -------------------------------------------------------------------- */