Subversion Repositories iso7816_3_master

function [7:0] hexString2Byte;

        input [15:0] byteInHexString;

        integer i;

        reg [7:0] hexDigit;

        reg [4:0] nibble;

        begin

                //hexString2Byte=0;

                for(i=0;i<2;i=i+1) begin

                        nibble=5'b10000;//invalid

                        hexDigit=byteInHexString[i*8+:8];

                        if(("0"<=hexDigit)&&("9">=hexDigit))

                                nibble=hexDigit-"0";

                        if(("a"<=hexDigit)&&("f">=hexDigit))

                                nibble=10+hexDigit-"a";

                        if(("A"<=hexDigit)&&("F">=hexDigit))

                                nibble=10+hexDigit-"A";

                        if(nibble>15) begin

                                $display("Invalid input for hex conversion: '%s', hexDigit='%s' (%x), nibble=%d",byteInHexString,hexDigit,hexDigit,nibble);

                                $finish;

                        end

                        hexString2Byte[i*4+:4]=nibble;

                end

        end

endfunction