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/* -*- c++ -*- */
/*
* Copyright 2004,2006 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 <usrp_source_c.h>
#include <gr_io_signature.h>
#include <usrp_standard.h>
#include <usrp_bytesex.h>
static const int NBASIC_SAMPLES_PER_ITEM = 2; // I & Q
usrp_source_c_sptr
usrp_make_source_c (int which_board,
unsigned int decim_rate,
int nchan,
int mux,
int mode,
int fusb_block_size,
int fusb_nblocks,
const std::string fpga_filename,
const std::string firmware_filename
) throw (std::runtime_error)
{
return usrp_source_c_sptr (new usrp_source_c (which_board,
decim_rate,
nchan,
mux,
mode,
fusb_block_size,
fusb_nblocks,
fpga_filename,
firmware_filename
));
}
usrp_source_c::usrp_source_c (int which_board,
unsigned int decim_rate,
int nchan,
int mux,
int mode,
int fusb_block_size,
int fusb_nblocks,
const std::string fpga_filename,
const std::string firmware_filename
) throw (std::runtime_error)
: usrp_source_base ("usrp_source_c",
gr_make_io_signature (1, 1, sizeof (gr_complex)),
which_board, decim_rate, nchan, mux, mode,
fusb_block_size, fusb_nblocks,
fpga_filename, firmware_filename)
{
}
usrp_source_c::~usrp_source_c ()
{
// NOP
}
int
usrp_source_c::ninput_bytes_reqd_for_noutput_items (int noutput_items)
{
return noutput_items * NBASIC_SAMPLES_PER_ITEM * sizeof_basic_sample();
}
/*
* Convert interleaved 8 or 16-bit I & Q from usrp buffer into a single
* complex output stream.
*/
void
usrp_source_c::copy_from_usrp_buffer (gr_vector_void_star &output_items,
int output_index,
int output_items_available,
int &output_items_produced,
const void *usrp_buffer,
int usrp_buffer_length,
int &bytes_read)
{
gr_complex *out = &((gr_complex *) output_items[0])[output_index];
unsigned sbs = sizeof_basic_sample();
unsigned nusrp_bytes_per_item = NBASIC_SAMPLES_PER_ITEM * sbs;
int nitems = std::min (output_items_available,
(int)(usrp_buffer_length / nusrp_bytes_per_item));
signed char *s8 = (signed char *) usrp_buffer;
short *s16 = (short *) usrp_buffer;
switch (sbs){
case 1:
for (int i = 0; i < nitems; i++){
out[i] = gr_complex ((float)(s8[2*i+0] << 8), (float)(s8[2*i+1] << 8));
}
break;
case 2:
for (int i = 0; i < nitems; i++){
out[i] = gr_complex ((float) usrp_to_host_short(s16[2*i+0]),
(float) usrp_to_host_short(s16[2*i+1]));
}
break;
default:
assert(0);
}
output_items_produced = nitems;
bytes_read = nitems * nusrp_bytes_per_item;
}
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