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Diffstat (limited to 'gr-pager/lib/flex_deinterleave_impl.cc')
| -rw-r--r-- | gr-pager/lib/flex_deinterleave_impl.cc | 107 |
1 files changed, 0 insertions, 107 deletions
diff --git a/gr-pager/lib/flex_deinterleave_impl.cc b/gr-pager/lib/flex_deinterleave_impl.cc deleted file mode 100644 index 08ced37119..0000000000 --- a/gr-pager/lib/flex_deinterleave_impl.cc +++ /dev/null @@ -1,107 +0,0 @@ -/* -*- c++ -*- */ -/* - * Copyright 2004,2006,2010,2012 Free Software Foundation, Inc. - * - * This file is part of GNU Radio - * - * GNU Radio 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; either version 3, or (at your option) - * any later version. - * - * GNU Radio 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 for more details. - * - * You should have received a copy of the GNU General Public License - * along with GNU Radio; see the file COPYING. If not, write to - * the Free Software Foundation, Inc., 51 Franklin Street, - * Boston, MA 02110-1301, USA. - */ - -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif - -#include "flex_deinterleave_impl.h" -#include "bch3221.h" -#include "util.h" -#include <gnuradio/io_signature.h> - -namespace gr { - namespace pager { - - flex_deinterleave::sptr - flex_deinterleave::make() - { - return gnuradio::get_initial_sptr - (new flex_deinterleave_impl()); - } - - flex_deinterleave_impl::flex_deinterleave_impl() : - sync_decimator("flex_deinterleave", - io_signature::make(1, 1, sizeof(unsigned char)), - io_signature::make(1, 1, sizeof(int)), 32) - { - set_output_multiple(8); // One FLEX block at a time - } - - flex_deinterleave_impl::~flex_deinterleave_impl() - { - } - - int flex_deinterleave_impl::work(int noutput_items, - gr_vector_const_void_star &input_items, - gr_vector_void_star &output_items) - { - const unsigned char *in = (const unsigned char *)input_items[0]; - int *out = (int *)output_items[0]; - - // FLEX codewords are interleaved in blocks of 256 bits or 8, 32 - // bit codes. To deinterleave we parcel each incoming bit into - // the MSB of each codeword, then switch to MSB-1, etc. This is - // done by shifting in the bits from the right on each codeword - // as the bits come in. When we are done we have a FLEX block of - // eight codewords, ready for conversion to data words. - // - // FLEX data words are recovered by reversing the bit order of - // the code word, masking off the (reversed) ECC, and inverting - // the remainder of the bits (!). - // - // The data portion of a FLEX frame consists of 11 of these - // deinterleaved and converted blocks. - // - // set_output_multiple garauntees we have output space for at - // least eight data words, and 256 bits are supplied on input - - int i, j; - for(i = 0; i < 32; i++) { - for(j = 0; j < 8; j++) { - d_codewords[j] <<= 1; - d_codewords[j] |= *in++; - } - } - - // Now convert code words into data words - for(j = 0; j < 8; j++) { - int codeword = d_codewords[j]; - - // Apply BCH 32,21 error correction - // TODO: mark dataword when codeword fails ECC - bch3221(codeword); - - // Reverse bit order - codeword = reverse_bits32(codeword); - - // Mask off ECC then invert lower 21 bits - codeword = (codeword & 0x001FFFFF)^0x001FFFFF; - - *out++ = codeword; - } - - return j; - } - - } /* namespace pager */ -} /* namespace gr */ |