1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
|
/* -*- c++ -*- */
/*
* Copyright 2010 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.
*/
#include <uhd_simple_source.h>
#include <gr_io_signature.h>
#include <boost/thread.hpp>
#include <stdexcept>
#include "utils.h"
/***********************************************************************
* Make UHD Source
**********************************************************************/
boost::shared_ptr<uhd_simple_source> uhd_make_simple_source(
const std::string &args,
const std::string &type
){
return boost::shared_ptr<uhd_simple_source>(
new uhd_simple_source(args_to_device_addr(args), type)
);
}
/***********************************************************************
* UHD Source
**********************************************************************/
uhd_simple_source::uhd_simple_source(
const uhd::device_addr_t &addr,
const std::string &type
) : gr_sync_block(
"uhd source",
gr_make_io_signature(0, 0, 0),
gr_make_io_signature(1, 1, get_size(type))
){
_type = type;
_dev = uhd::device::make(addr);
_sizeof_samp = get_size(type);
set_streaming(false);
}
uhd_simple_source::~uhd_simple_source(void){
set_streaming(false);
}
/***********************************************************************
* DDC Control
**********************************************************************/
void uhd_simple_source::set_streaming(bool enb){
wax::obj ddc = (*_dev)
[uhd::DEVICE_PROP_MBOARD]
[uhd::named_prop_t(uhd::MBOARD_PROP_RX_DSP, "ddc0")];
ddc[std::string("enabled")] = enb;
_is_streaming = enb;
}
/***********************************************************************
* Work
**********************************************************************/
int uhd_simple_source::work(
int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items
){
//conditionally start streaming in the work call
//this prevents streaming before the runtime is ready
if (not _is_streaming) set_streaming(true);
size_t total_items_read = 0;
size_t timeout_count = 50;
uhd::rx_metadata_t metadata;
//call until the output items are all filled
//or an exit condition below is encountered
while(total_items_read < size_t(noutput_items)){
size_t items_read = _dev->recv(
boost::asio::buffer(
(uint8_t *)output_items[0]+(total_items_read*_sizeof_samp),
(noutput_items-total_items_read)*_sizeof_samp
), metadata, _type
);
//record items read and recv again
if (items_read > 0){
total_items_read += items_read;
continue;
}
//if we have read at least once, but not this time, get out
// commented out behaviour: I believe that it would be better to
// fill the buffer entirely to mimimize scheduler context switching
//if (total_items_read > 0) break;
//the timeout part
boost::this_thread::sleep(boost::posix_time::milliseconds(1));
if (--timeout_count == 0) break;
}
return total_items_read;
}
|
