packet_receiver_impl.h

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/* -*- c++ -*- */
/* 
 * Copyright 2015 Pavel Yazev <pyazev@gmail.com>
 * 
 * This 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.
 * 
 * This software 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 this software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifndef INCLUDED_DECT2_PACKET_RECEIVER_IMPL_H
#define INCLUDED_DECT2_PACKET_RECEIVER_IMPL_H

#include <dect2/packet_receiver.h>


#define MAX_PARTS          8                      // Maximum number of DECT parts to be tracked
#define SMPL_BUF_LEN       (32 * 4)  
#define TIME_TOL           10                     // Time tolerance
#define INTER_SLOT_TIME   (480 * 4)               
#define INTER_FRAME_TIME  (INTER_SLOT_TIME * 24) 
#define S_FIELD_BITS       32
#define P32_D_FIELD_BITS   388
#define RFP_SYNC_FIELD     0xAAAAE98A


namespace gr {
  namespace dect2 {

    class packet_receiver_impl : public packet_receiver
    {
        private:
            typedef enum {_RFP_, _PP_} part_type;

            part_type d_part_type;

            uint32_t  d_rx_bits_buf[4];       // Buffer to save demodulated bits. Input signal has four samples per bits. 
                                              // We save bits related to null sample in null element, bits related to first sample in firts element
                                              // and so on. Each element in this array should be considered as circular buffer.
            unsigned  d_rx_bits_buf_index; 
            enum  {_WAIT_BEGIN_, _WAIT_END_, _POST_WAIT_} d_sync_state;

            uint32_t  d_begin_pos;
            uint32_t  d_end_pos;
            uint32_t  d_post_wait_cnt;

            float     d_smpl_buf[SMPL_BUF_LEN];
            uint32_t  d_smpl_buf_index;


            uint32_t  d_smpl_cnt;
            uint32_t  d_out_bit_cnt;
            uint64_t  d_inc_smpl_cnt;          // Incomming samples counter


            uint64_t  d_part_time[MAX_PARTS];
            uint32_t  d_part_seq[MAX_PARTS]; 
            uint32_t  d_part_activity;

            int32_t   d_cur_part_rx_id;



            int d_decimation;
            int  decimation () const { return d_decimation; }
            void set_decimation (int decimation)
            {
                d_decimation = decimation;
                set_relative_rate (1.0 / decimation);
            }
      
            int fixed_rate_ninput_to_noutput(int ninput);
            int fixed_rate_noutput_to_ninput(int noutput);

            int check_part_activity(void);
            int register_part(void);
            int find_best_smpl_point(void);

        public:
            packet_receiver_impl();
            ~packet_receiver_impl();

            // Where all the action really happens
            void forecast (int noutput_items, gr_vector_int &ninput_items_required);

            int general_work(int noutput_items,
                            gr_vector_int &ninput_items,
                            gr_vector_const_void_star &input_items,
                            gr_vector_void_star &output_items);
    };

  } // namespace dect2
} // namespace gr

#endif /* INCLUDED_DECT2_PACKET_RECEIVER_IMPL_H */