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   1 /* -*- c++ -*- */
   2 /*
   3  * Copyright 2004,2006 Free Software Foundation, Inc.
   4  *
   5  * This file is part of GNU Radio
   6  *
   7  * GNU Radio is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2, or (at your option)
  10  * any later version.
  11  *
  12  * GNU Radio is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with GNU Radio; see the file COPYING.  If not, write to
  19  * the Free Software Foundation, Inc., 51 Franklin Street,
  20  * Boston, MA 02110-1301, USA.
  21  */
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26
  27 #include <usrp1_sink_s.h>
  28 #include <gr_io_signature.h>
  29 #include <usrp_standard.h>
  30 #include <usrp_bytesex.h>
  31
  32 usrp1_sink_s_sptr
  33 usrp1_make_sink_s (int which_board,
  34                    unsigned int interp_rate,
  35                    int nchan,
  36                    int mux,
  37                    int fusb_block_size,
  38                    int fusb_nblocks,
  39                    const std::string fpga_filename,
  40                    const std::string firmware_filename
  41                    ) throw (std::runtime_error)
  42 {
  43   return usrp1_sink_s_sptr (new usrp1_sink_s (which_board,
  44                                               interp_rate,
  45                                               nchan,
  46                                               mux,
  47                                               fusb_block_size,
  48                                               fusb_nblocks,
  49                                               fpga_filename,
  50                                               firmware_filename
  51                                               ));
  52 }
  53
  54
  55 usrp1_sink_s::usrp1_sink_s (int which_board,
  56                             unsigned int interp_rate,
  57                             int nchan,
  58                             int mux,
  59                             int fusb_block_size,
  60                             int fusb_nblocks,
  61                             const std::string fpga_filename,
  62                             const std::string firmware_filename
  63                             ) throw (std::runtime_error)
  64   : usrp1_sink_base ("usrp1_sink_s",
  65                      gr_make_io_signature (1, 1, sizeof (short)),
  66                      which_board, interp_rate, nchan, mux,
  67                      fusb_block_size, fusb_nblocks,
  68                      fpga_filename, firmware_filename)
  69 {
  70   set_output_multiple (512 / sizeof(short));    // don't change
  71 }
  72
  73 usrp1_sink_s::~usrp1_sink_s ()
  74 {
  75   // NOP
  76 }
  77
  78 /*
  79  * Take one short input stream and format it into interleaved short I & Q
  80  * for the usrp.
  81  */
  82 void
  83 usrp1_sink_s::copy_to_usrp_buffer (gr_vector_const_void_star &input_items,
  84                                    int  input_index,
  85                                    int  input_items_available,
  86                                    int  &input_items_consumed,  // out
  87                                    void *usrp_buffer,
  88                                    int  usrp_buffer_length,
  89                                    int  &bytes_written)         // out
  90 {
  91   short *in = &((short *) input_items[0])[input_index];
  92   short *dst = (short *) usrp_buffer;
  93
  94   static const int usrp_bytes_per_input_item = sizeof (short);
  95
  96   int nitems = std::min (input_items_available,
  97                          usrp_buffer_length / usrp_bytes_per_input_item);
  98
  99   for (int i = 0; i < nitems; i++){     // FIXME unroll
 100     dst[i] = host_to_usrp_short(in[i]);
 101   }
 102
 103   input_items_consumed = nitems;
 104   bytes_written = nitems * usrp_bytes_per_input_item;
 105 }
 106