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acapola |
/*
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Author: Sebastien Riou (acapola)
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Creation date: 17:16:40 01/09/2011
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$LastChangedDate: 2011-01-29 13:16:17 +0100 (Sat, 29 Jan 2011) $
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$LastChangedBy: acapola $
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$LastChangedRevision: 11 $
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$HeadURL: file:///svn/iso7816_3_master/iso7816_3_master/trunk/test/HexStringConversion.v $
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This file is under the BSD licence:
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Copyright (c) 2011, Sebastien Riou
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
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The names of contributors may not be used to endorse or promote products derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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`default_nettype none
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acapola |
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function [7:0] hexString2Byte;
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input [15:0] byteInHexString;
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integer i;
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reg [7:0] hexDigit;
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reg [4:0] nibble;
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begin
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//hexString2Byte=0;
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for(i=0;i<2;i=i+1) begin
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nibble=5'b10000;//invalid
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hexDigit=byteInHexString[i*8+:8];
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if(("0"<=hexDigit)&&("9">=hexDigit))
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nibble=hexDigit-"0";
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if(("a"<=hexDigit)&&("f">=hexDigit))
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nibble=10+hexDigit-"a";
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if(("A"<=hexDigit)&&("F">=hexDigit))
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nibble=10+hexDigit-"A";
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if(nibble>15) begin
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$display("Invalid input for hex conversion: '%s', hexDigit='%s' (%x), nibble=%d",byteInHexString,hexDigit,hexDigit,nibble);
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$finish;
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end
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hexString2Byte[i*4+:4]=nibble;
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end
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end
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endfunction
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