GNU Radio 3.5.1 C++ API
gr_lfsr_32k_source_s.h
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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2004 Free Software Foundation, Inc.
00004  * 
00005  * This file is part of GNU Radio
00006  * 
00007  * GNU Radio is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 3, or (at your option)
00010  * any later version.
00011  * 
00012  * GNU Radio is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  * 
00017  * You should have received a copy of the GNU General Public License
00018  * along with GNU Radio; see the file COPYING.  If not, write to
00019  * the Free Software Foundation, Inc., 51 Franklin Street,
00020  * Boston, MA 02110-1301, USA.
00021  */
00022 
00023 #ifndef INCLUDED_GR_LFSR_32K_SOURCE_S_H
00024 #define INCLUDED_GR_LFSR_32K_SOURCE_S_H
00025 
00026 #include <gr_core_api.h>
00027 #include <gr_sync_block.h>
00028 #include <gri_lfsr_32k.h>
00029 
00030 class gr_lfsr_32k_source_s;
00031 typedef boost::shared_ptr<gr_lfsr_32k_source_s> gr_lfsr_32k_source_s_sptr;
00032 
00033 GR_CORE_API gr_lfsr_32k_source_s_sptr gr_make_lfsr_32k_source_s ();
00034 
00035 /*!
00036  * \brief LFSR pseudo-random source with period of 2^15 bits (2^11 shorts)
00037  * \ingroup source_blk
00038  *
00039  * This source is typically used along with gr_check_lfsr_32k_s to test
00040  * the USRP using its digital loopback mode.
00041  */
00042 class GR_CORE_API gr_lfsr_32k_source_s : public gr_sync_block
00043 {
00044   friend GR_CORE_API gr_lfsr_32k_source_s_sptr gr_make_lfsr_32k_source_s ();
00045 
00046   
00047   static const int BUFSIZE = 2048 - 1;  // ensure pattern isn't packet aligned
00048   int           d_index;
00049   short         d_buffer[BUFSIZE];
00050 
00051   gr_lfsr_32k_source_s ();
00052 
00053  public:
00054 
00055   virtual int work (int noutput_items,
00056                     gr_vector_const_void_star &input_items,
00057                     gr_vector_void_star &output_items);
00058 };
00059 
00060 
00061 #endif