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Diffstat (limited to 'gr-pager/lib/pager_flex_deinterleave.cc')
| -rw-r--r-- | gr-pager/lib/pager_flex_deinterleave.cc | 94 |
1 files changed, 0 insertions, 94 deletions
diff --git a/gr-pager/lib/pager_flex_deinterleave.cc b/gr-pager/lib/pager_flex_deinterleave.cc deleted file mode 100644 index f7f1d9f69..000000000 --- a/gr-pager/lib/pager_flex_deinterleave.cc +++ /dev/null @@ -1,94 +0,0 @@ -/* - * Copyright 2004,2006,2010 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 <pager_flex_deinterleave.h> -#include <pageri_bch3221.h> -#include <pageri_util.h> -#include <gr_io_signature.h> - -pager_flex_deinterleave_sptr pager_make_flex_deinterleave() -{ - return gnuradio::get_initial_sptr(new pager_flex_deinterleave()); -} - -pager_flex_deinterleave::pager_flex_deinterleave() : - gr_sync_decimator("flex_deinterleave", - gr_make_io_signature(1, 1, sizeof(unsigned char)), - gr_make_io_signature(1, 1, sizeof(gr_int32)), 32) -{ - set_output_multiple(8); // One FLEX block at a time -} - -int pager_flex_deinterleave::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]; - gr_int32 *out = (gr_int32 *)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++) { - gr_int32 codeword = d_codewords[j]; - - // Apply BCH 32,21 error correction - // TODO: mark dataword when codeword fails ECC - pageri_bch3221(codeword); - - // Reverse bit order - codeword = pageri_reverse_bits32(codeword); - - // Mask off ECC then invert lower 21 bits - codeword = (codeword & 0x001FFFFF)^0x001FFFFF; - - *out++ = codeword; - } - - return j; -} |