usrp_lib.cpp 8.12 KB
Newer Older
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
/*******************************************************************************
    OpenAirInterface 
    Copyright(c) 1999 - 2014 Eurecom

    OpenAirInterface 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 of the License, or
    (at your option) any later version.


    OpenAirInterface 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 OpenAirInterface.The full GNU General Public License is 
    included in this distribution in the file called "COPYING". If not, 
    see <http://www.gnu.org/licenses/>.

   Contact Information
   OpenAirInterface Admin: openair_admin@eurecom.fr
   OpenAirInterface Tech : openair_tech@eurecom.fr
   OpenAirInterface Dev  : openair4g-devel@eurecom.fr
  
ghaddab's avatar
ghaddab committed
26
   Address      : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
27
28

 *******************************************************************************/
knopp's avatar
 
knopp committed
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46

/** usrp_lib.cpp
 *
 * Author: HongliangXU : hong-liang-xu@agilent.com
 */

#include <string.h>
#include <pthread.h>
#include <unistd.h>
#include <stdio.h>
#include <uhd/utils/thread_priority.hpp>
#include <uhd/usrp/multi_usrp.hpp>
#include <boost/lexical_cast.hpp>
#include <boost/algorithm/string.hpp>
#include <iostream>
#include <complex>
#include <fstream>
#include <cmath>
knopp's avatar
   
knopp committed
47
#include "common_lib.h"
knopp's avatar
 
knopp committed
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

typedef struct
{

  // --------------------------------
  // variables for USRP configuration
  // --------------------------------
  uhd::usrp::multi_usrp::sptr usrp;
  //uhd::usrp::multi_usrp::sptr rx_usrp;

  //create a send streamer and a receive streamer
  uhd::tx_streamer::sptr tx_stream;
  uhd::rx_streamer::sptr rx_stream;

  uhd::tx_metadata_t tx_md;
  uhd::rx_metadata_t rx_md;

  uhd::time_spec_t tm_spec;
  //setup variables and allocate buffer
  uhd::async_metadata_t async_md;

  double sample_rate;
  // time offset between transmiter timestamp and receiver timestamp;
  double tdiff;
  // use usrp_time_offset to get this value
  int tx_forward_nsamps; //166 for 20Mhz


  // --------------------------------
  // Debug and output control
  // --------------------------------
  int num_underflows;
  int num_overflows;
  int num_seq_errors;

  int64_t tx_count;
  int64_t rx_count;
  openair0_timestamp rx_timestamp;

} usrp_state_t;


static int trx_usrp_start(openair0_device *device)
{
  usrp_state_t *s = (usrp_state_t*)device->priv;

  // init recv and send streaming
  uhd::stream_cmd_t cmd(uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS);
knopp's avatar
   
knopp committed
96
  cmd.time_spec = s->usrp->get_time_now() + uhd::time_spec_t(0.001);
knopp's avatar
 
knopp committed
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
  cmd.stream_now = false; // start at constant delay
  s->rx_stream->issue_stream_cmd(cmd);

  s->tx_md.time_spec = s->usrp->get_time_now() + uhd::time_spec_t(1-(double)s->tx_forward_nsamps/s->sample_rate);
  s->tx_md.has_time_spec = true;
  s->tx_md.start_of_burst = true;
  s->tx_md.end_of_burst = false;


  s->rx_count = 0;
  s->tx_count = 0;
  s->rx_timestamp = 0;
}

static void trx_usrp_end(openair0_device *device)
{
  usrp_state_t *s = (usrp_state_t*)device->priv;

  s->rx_stream->issue_stream_cmd(uhd::stream_cmd_t::STREAM_MODE_STOP_CONTINUOUS);

	//send a mini EOB packet
	s->tx_md.end_of_burst = true;
	s->tx_stream->send("", 0, s->tx_md);
	s->tx_md.end_of_burst = false;
}
static void trx_usrp_write(openair0_device *device, openair0_timestamp timestamp, const void *buff, int nsamps, int flags)
{
  usrp_state_t *s = (usrp_state_t*)device->priv;

  s->tx_md.time_spec = uhd::time_spec_t::from_ticks(timestamp, s->sample_rate);
  if(flags)
    s->tx_md.has_time_spec = true;
  else
    s->tx_md.has_time_spec = false;
  s->tx_stream->send(buff, nsamps, s->tx_md);
  s->tx_md.start_of_burst = false;
}

static int trx_usrp_read(openair0_device *device, openair0_timestamp *ptimestamp, void *buff, int nsamps)
{

  usrp_state_t *s = (usrp_state_t*)device->priv;

  int samples_received;
  //TODO: only one channel is supported now
  samples_received = s->rx_stream->recv(buff, nsamps, s->rx_md);

	//handle the error code
	switch(s->rx_md.error_code){
		case uhd::rx_metadata_t::ERROR_CODE_NONE:
			break;
		case uhd::rx_metadata_t::ERROR_CODE_OVERFLOW:
			printf("[recv] USRP RX OVERFLOW!\n");
			s->num_overflows++;
			break;
		case uhd::rx_metadata_t::ERROR_CODE_TIMEOUT:
			printf("[recv] USRP RX TIMEOUT!\n");
			break;
		default:
			printf("[recv] Unexpected error on RX, Error code: 0x%x\n",s->rx_md.error_code);
			break;
	}
  s->rx_count += nsamps;
  s->rx_timestamp = s->rx_md.time_spec.to_ticks(s->sample_rate);
  *ptimestamp = s->rx_timestamp;
  return samples_received;
}

knopp's avatar
   
knopp committed
165
166
167
168
169
170
171
172
openair0_timestamp get_usrp_time(openair0_device *device) 
{
 
  usrp_state_t *s = (usrp_state_t*)device->priv;
  
  return s->usrp->get_time_now().to_ticks(s->sample_rate);
} 

knopp's avatar
 
knopp committed
173
174
175
176
static bool is_equal(double a, double b)
{
  return std::fabs(a-b) < std::numeric_limits<double>::epsilon();
}
knopp's avatar
   
knopp committed
177
 
knopp's avatar
 
knopp committed
178
179
int openair0_device_init(openair0_device* device, openair0_config_t *openair0_cfg)
{
knopp's avatar
   
knopp committed
180
  //  uhd::set_thread_priority_safe(1.0);
knopp's avatar
 
knopp committed
181
182
183
184
  usrp_state_t *s = (usrp_state_t*)malloc(sizeof(usrp_state_t));
  memset(s, 0, sizeof(usrp_state_t));

  // Initialize USRP device
knopp's avatar
   
knopp committed
185
  std::string args = "type=b200";
knopp's avatar
 
knopp committed
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
  uhd::device_addrs_t device_adds = uhd::device::find(args);
  if(device_adds.size() == 0)
  {
    std::cerr<<"No USRP Device Found. " << std::endl;
    free(s);
    return -1;
  }
  s->usrp = uhd::usrp::multi_usrp::make(args);

  // lock mboard clocks
  s->usrp->set_clock_source("internal");
  // set master clock rate and sample rate for tx & rx for streaming
  s->usrp->set_master_clock_rate(30.72e6);
  s->usrp->set_rx_rate(openair0_cfg->sample_rate);
  s->usrp->set_tx_rate(openair0_cfg->sample_rate);

knopp's avatar
   
knopp committed
202
203
204
205
  s->usrp->set_tx_freq(openair0_cfg->tx_freq[0]);
  s->usrp->set_rx_freq(openair0_cfg->rx_freq[0]);
  s->usrp->set_tx_gain(openair0_cfg->tx_gain[0]);
  s->usrp->set_rx_gain(openair0_cfg->rx_gain[0]);
knopp's avatar
 
knopp committed
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
  s->usrp->set_tx_bandwidth(openair0_cfg->tx_bw);
  s->usrp->set_rx_bandwidth(openair0_cfg->rx_bw);

  // create tx & rx streamer
  uhd::stream_args_t stream_args("sc16", "sc16");
  s->tx_stream = s->usrp->get_tx_stream(stream_args);
  s->rx_stream = s->usrp->get_rx_stream(stream_args);

  s->usrp->set_time_now(uhd::time_spec_t(0.0));

  // display USRP settings
	std::cout << std::endl<<boost::format("Actual TX sample rate: %fMSps...") % (s->usrp->get_tx_rate()/1e6) << std::endl;
	std::cout << boost::format("Actual RX sample rate: %fMSps...") % (s->usrp->get_rx_rate()/1e6) << std::endl;

	std::cout << boost::format("Actual TX frequency: %fGHz...") % (s->usrp->get_tx_freq()/1e9) << std::endl;
	std::cout << boost::format("Actual RX frequency: %fGHz...") % (s->usrp->get_rx_freq()/1e9) << std::endl;

	std::cout << boost::format("Actual TX gain: %f...") % (s->usrp->get_tx_gain()) << std::endl;
	std::cout << boost::format("Actual RX gain: %f...") % (s->usrp->get_rx_gain()) << std::endl;

	std::cout << boost::format("Actual TX bandwidth: %fM...") % (s->usrp->get_tx_bandwidth()/1e6) << std::endl;
	std::cout << boost::format("Actual RX bandwidth: %fM...") % (s->usrp->get_rx_bandwidth()/1e6) << std::endl;

	std::cout << boost::format("Actual TX antenna: %s...") % (s->usrp->get_tx_antenna()) << std::endl;
	std::cout << boost::format("Actual RX antenna: %s...") % (s->usrp->get_rx_antenna()) << std::endl;

	std::cout << boost::format("Device timestamp: %f...") % (s->usrp->get_time_now().get_real_secs()) << std::endl;

  device->priv = s;
  device->trx_start_func = trx_usrp_start;
  device->trx_end_func   = trx_usrp_end;
  device->trx_read_func  = trx_usrp_read;
  device->trx_write_func = trx_usrp_write;

  s->sample_rate = openair0_cfg->sample_rate;
  // TODO:
  // init tx_forward_nsamps based usrp_time_offset ex
  if(is_equal(s->sample_rate, (double)30.72e6))
    s->tx_forward_nsamps  = 176;
  if(is_equal(s->sample_rate, (double)15.36e6))
    s->tx_forward_nsamps = 90;
  if(is_equal(s->sample_rate, (double)7.68e6))
    s->tx_forward_nsamps = 50;

  return 0;
}