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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2016 Edouard Griffiths, F4EXB. //
// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation as version 3 of the License, or //
// //
// This program is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#include <iostream>
#include "../fec.h"
void decode(DSDcc::Hamming_7_4& hamming_7_4, unsigned char *codeword)
{
for (int i = 0; i < 7; i++)
{
std::cout << (int) codeword[i] << " ";
}
std::cout << std::endl;
if (hamming_7_4.decode(codeword))
{
for (int i = 0; i < 4; i++)
{
std::cout << (int) codeword[i] << " ";
}
std::cout << std::endl << "Decoding OK" << std::endl;
}
else
{
std::cout << "Decoding error" << std::endl;
}
}
int main(int argc, char *argv[])
{
unsigned char msg[4] = {1, 0, 0, 1};
unsigned char er0[7] = {0, 0, 1, 0, 0, 0, 0};
unsigned char codeword[7], xcodeword[7];
DSDcc::Hamming_7_4 hamming_7_4;
hamming_7_4.encode(msg, codeword);
std::cout << "No errors" << std::endl;
decode(hamming_7_4, codeword);
std::cout << std::endl << "Error (2)" << std::endl;
decode(hamming_7_4, er0);
std::cout << std::endl << "Flip one bit (2)" << std::endl;
std::copy(codeword, codeword + 7, xcodeword);
xcodeword[2] ^= 1;
decode(hamming_7_4, xcodeword);
for (int i = 0; i < 3; i++)
{
std::cout << std::endl << "Flip one parity bit " << 4+i << std::endl;
std::copy(codeword, codeword + 7, xcodeword);
xcodeword[4+i] ^= 1;
decode(hamming_7_4, xcodeword);
}
std::cout << std::endl << "Valid checksums" << std::endl;
for (int i = 0; i < 16; i++)
{
msg[0] = (i>>3) & 1;
msg[1] = (i>>2) & 1;
msg[2] = (i>>1) & 1;
msg[3] = i & 1;
hamming_7_4.encode(msg, codeword);
int codenumber = 0;
for (int j = 0; j < 7; j++)
{
codenumber += codeword[j] * (1<<(6-j));
}
std::cout << codenumber << std::endl;
}
return 0;
}
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