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[/] [qaz_libs/] [trunk/] [cli/] [util/] [util_bits.c] - Blame information for rev 24

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1 24 qaztronic
//////////////////////////////////////////////////////////////////////
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////                                                              ////
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//// Copyright (C) 2015 Authors and OPENCORES.ORG                 ////
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////                                                              ////
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//// This source file may be used and distributed without         ////
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//// restriction provided that this copyright statement is not    ////
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//// removed from the file and that any derivative work contains  ////
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//// the original copyright notice and the associated disclaimer. ////
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////                                                              ////
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//// This source file is free software; you can redistribute it   ////
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//// and/or modify it under the terms of the GNU Lesser General   ////
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//// Public License as published by the Free Software Foundation; ////
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//// either version 2.1 of the License, or (at your option) any   ////
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//// later version.                                               ////
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////                                                              ////
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//// This source is distributed in the hope that it will be       ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
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//// PURPOSE.  See the GNU Lesser General Public License for more ////
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//// details.                                                     ////
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////                                                              ////
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//// You should have received a copy of the GNU Lesser General    ////
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//// Public License along with this source; if not, download it   ////
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//// from http://www.opencores.org/lgpl.shtml                     ////
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////                                                              ////
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//////////////////////////////////////////////////////////////////////
27 22 qaztronic
 
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#include "util_bits.h"
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/*-----------------------------------------------------------*/
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void inline
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  util_set_bits
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  (
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    unsigned int address,
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    unsigned int bit_offset,
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    unsigned int bit_mask,
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    unsigned int data
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  )
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{
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  volatile unsigned int *word_pointer = (volatile unsigned int *)(address);
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  unsigned int buffer;
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  data <<= bit_offset;
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  data &= bit_mask;
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  buffer = *word_pointer;
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  buffer &= ~bit_mask;
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  buffer |= data;
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  *word_pointer = buffer;
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}
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/*-----------------------------------------------------------*/
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unsigned int inline
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  util_get_bits
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  (
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    unsigned int address,
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    unsigned int bit_offset,
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    unsigned int bit_mask
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  )
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{
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  volatile unsigned int *word_pointer = (volatile unsigned int *)(address);
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  unsigned int buffer;
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  buffer = *word_pointer;
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  buffer &= bit_mask;
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  buffer >>= bit_offset;
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  return(buffer);
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}
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/*-----------------------------------------------------------*/
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unsigned char ReverseBits7ops32bit(unsigned char v)
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{
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    return ((v * 0x0802LU & 0x22110LU) |
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            (v * 0x8020LU & 0x88440LU)) * 0x10101LU >> 16;
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}
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