90 lines
2.9 KiB
C++
90 lines
2.9 KiB
C++
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/*
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# Copyright 2010 Nick Foster
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#
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# This file is part of gr-air-modes
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#
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# gr-air-modes is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3, or (at your option)
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# any later version.
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#
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# gr-air-modes is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with gr-air-modes; see the file COPYING. If not, write to
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# the Free Software Foundation, Inc., 51 Franklin Street,
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# Boston, MA 02110-1301, USA.
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#
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <air_modes_int_and_dump.h>
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#include <gr_io_signature.h>
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#include <string.h>
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#include <iostream>
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air_modes_int_and_dump_sptr air_make_modes_int_and_dump(int samples_per_symbol)
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{
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return air_modes_int_and_dump_sptr (new air_modes_int_and_dump(samples_per_symbol));
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}
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air_modes_int_and_dump::air_modes_int_and_dump(int samps_per_chip) :
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gr_block ("modes_int_and_dump",
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gr_make_io_signature (1, 1, sizeof(float)),
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gr_make_io_signature (1, 1, sizeof(float)))
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{
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d_samples_per_symbol = samples_per_symbol;
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set_output_multiple(d_samples_per_symbol);
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set_history(d_samples_per_symbol);
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d_acc = 0;
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d_pos = 0;
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}
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int air_modes_int_and_dump::general_work(int noutput_items,
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gr_vector_int &ninput_items,
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gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items)
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{
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const float *in = (const float *) input_items[0];
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float *out = (float *) output_items[0];
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int input_items = std::min(ninput_items[0], ninput_items[1]); //just in case
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//ok first of all we look for "preamble_found" tags in our input range.
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//get a vector of these tags, then every time we hit one
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//reset the integrator position and accumulator
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std::vector<pmt::pmt_t> tags;
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uint64_t abs_sample_cnt = nitems_read(0);
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get_tags_in_range(tags, 0, abs_sample_cnt, abs_sample_cnt + ninput_items, pmt::pmt_string_to_symbol("preamble_found"));
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int out_items = 0;
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int offset = gr_tags::get_nitems(&tags[0]) - abs_sample_cnt;
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for(int i=0; i<120*2; i++) { //for each symbol in a potential long packet
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out[out_items] = 0;
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for(int j=0; j<d_samples_per_symbol; j++) { //for each sample in the symbol
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out[out_items] += in[offset+i+j]; //integrate
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}
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out_items++;
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}
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//insert tag here
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add_item_tag(0, //stream ID
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nitems_written(0), //sample number
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pmt::pmt_string_to_symbol("preamble_found");
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pmt::PMT_T,
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pmt::pmt_string_to_symbol(unique_id());
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);
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consume_each(wat);
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return out_items;
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}
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