usrp_lib.cpp 9.14 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(0.01);
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
  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;
}
knopp's avatar
 
knopp committed
122
static void trx_usrp_write(openair0_device *device, openair0_timestamp timestamp, const void **buff, int nsamps, int flags)
knopp's avatar
 
knopp committed
123 124 125 126 127 128 129 130 131 132 133 134
{
  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;
}

knopp's avatar
 
knopp committed
135
static int trx_usrp_read(openair0_device *device, openair0_timestamp *ptimestamp, void **buff, int nsamps, int cc)
knopp's avatar
 
knopp committed
136 137 138 139
{

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

knopp's avatar
 
knopp committed
140 141
  int samples_received[cc],i;
  
knopp's avatar
 
knopp committed
142 143
  samples_received = s->rx_stream->recv(buff, nsamps, s->rx_md);

knopp's avatar
 
knopp committed
144 145 146 147 148 149 150 151 152 153 154 155 156 157 158
  //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;
  }
knopp's avatar
 
knopp committed
159 160 161 162 163 164
  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
177 178 179 180 181 182 183 184 185 186 187 188

int openair0_set_frequencies(openair0_device* device, openair0_config_t *openair0_cfg) {

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

  s->usrp->set_tx_freq(openair0_cfg[0].tx_freq[0]);
  s->usrp->set_rx_freq(openair0_cfg[0].rx_freq[0]);

  return(0);
  
}

knopp's avatar
 
knopp committed
189 190 191 192 193 194 195 196
int openair0_set_gains(openair0_device* device, openair0_config_t *openair0_cfg) {

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

  s->usrp->set_tx_gain(openair0_cfg[0].tx_gain[0]);
  s->usrp->set_rx_gain(openair0_cfg[0].rx_gain[0]);
  return(0);
}
knopp's avatar
 
knopp committed
197
 
knopp's avatar
 
knopp committed
198 199
int openair0_device_init(openair0_device* device, openair0_config_t *openair0_cfg)
{
knopp's avatar
knopp committed
200
  uhd::set_thread_priority_safe(1.0);
knopp's avatar
 
knopp committed
201 202 203 204
  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
205
  std::string args = "type=b200";
knopp's avatar
 
knopp committed
206
  uhd::device_addrs_t device_adds = uhd::device::find(args);
knopp's avatar
 
knopp committed
207 208
  size_t i;

knopp's avatar
 
knopp committed
209 210 211 212 213 214 215 216 217 218 219 220
  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);
knopp's avatar
knopp committed
221 222
  s->usrp->set_rx_rate(openair0_cfg[0].sample_rate);
  s->usrp->set_tx_rate(openair0_cfg[0].sample_rate);
knopp's avatar
 
knopp committed
223

knopp's avatar
 
knopp committed
224 225 226 227 228 229 230 231 232 233 234 235
  for(i=0;i<usrp->get_rx_num_channels();i++) {
    if (i<openair0_cfg[0].rx_num_channels) {
      s->usrp->set_rx_freq(openair0_cfg[0].rx_freq[i]);
      s->usrp->set_rx_gain(openair0_cfg[0].rx_gain[i]);
    }
  }
  for(i=0;i<usrp->get_tx_num_channels();i++) {
    if (i<openair0_cfg[0].tx_num_channels) {
      s->usrp->set_tx_freq(openair0_cfg[0].tx_freq[i]);
      s->usrp->set_tx_gain(openair0_cfg[0].tx_gain[i]);
    }
  }
knopp's avatar
knopp committed
236 237
  s->usrp->set_tx_bandwidth(openair0_cfg[0].tx_bw);
  s->usrp->set_rx_bandwidth(openair0_cfg[0].rx_bw);
knopp's avatar
 
knopp committed
238 239

  // create tx & rx streamer
knopp's avatar
 
knopp committed
240 241 242 243 244 245 246 247 248
  uhd::stream_args_t stream_args_rx("sc16", "sc16");
  uhd::stream_args_t stream_args_tx("sc16", "sc16");
  for (i = 0; i<  openair0_cfg[0].rx_num_channels(); i++)
      stream_args_rx.channels.push_back(i);
  for (i = 0; i<  openair0_cfg[0].tx_num_channels(); i++)
      stream_args_tx.channels.push_back(i);

  s->tx_stream = s->usrp->get_tx_stream(stream_args_tx);
  s->rx_stream = s->usrp->get_rx_stream(stream_args_rx);
knopp's avatar
 
knopp committed
249 250 251 252

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

  // display USRP settings
knopp's avatar
 
knopp committed
253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268
  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;
knopp's avatar
 
knopp committed
269 270 271 272 273 274 275

  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;

knopp's avatar
knopp committed
276
  s->sample_rate = openair0_cfg[0].sample_rate;
knopp's avatar
 
knopp committed
277 278 279 280 281 282 283 284 285 286 287
  // 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;
}