/*******************************************************************************
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 .
Contact Information
OpenAirInterface Admin: openair_admin@eurecom.fr
OpenAirInterface Tech : openair_tech@eurecom.fr
OpenAirInterface Dev : openair4g-devel@eurecom.fr
Address : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
*******************************************************************************/
/** usrp_lib.cpp
*
* Author: HongliangXU : hong-liang-xu@agilent.com
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include "common_lib.h"
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);
cmd.time_spec = s->usrp->get_time_now() + uhd::time_spec_t(0.01);
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, void **buff, int nsamps, int cc, 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;
if (cc>1) {
std::vector buff_ptrs;
for (int i=0;itx_stream->send(buff_ptrs, nsamps, s->tx_md);
}
else
s->tx_stream->send(buff[0], 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, int cc)
{
usrp_state_t *s = (usrp_state_t*)device->priv;
int samples_received,i;
if (cc>1) {
std::vector buff_ptrs;
for (int i=0;irx_stream->recv(buff_ptrs, nsamps, s->rx_md);
}
else
samples_received = s->rx_stream->recv(buff[0], 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;
}
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);
}
static bool is_equal(double a, double b)
{
return std::fabs(a-b) < std::numeric_limits::epsilon();
}
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);
}
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);
}
int openair0_device_init(openair0_device* device, openair0_config_t *openair0_cfg)
{
uhd::set_thread_priority_safe(1.0);
usrp_state_t *s = (usrp_state_t*)malloc(sizeof(usrp_state_t));
memset(s, 0, sizeof(usrp_state_t));
// Initialize USRP device
std::string args = "type=b200";
/* std::string rx_subdev = "A:A A:B";
std::string tx_subdev = "A:A A:B";*/
uhd::device_addrs_t device_adds = uhd::device::find(args);
size_t i;
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);
// s->usrp->set_rx_subdev_spec(rx_subdev);
// s->usrp->set_tx_subdev_spec(tx_subdev);
// 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);
for(i=0;iusrp->get_rx_num_channels();i++) {
if (iusrp->set_rx_rate(openair0_cfg[0].sample_rate,i);
s->usrp->set_rx_bandwidth(openair0_cfg[0].rx_bw);
printf("Setting rx freq/gain on channel %d/%d\n",i,s->usrp->get_rx_num_channels());
s->usrp->set_rx_freq(openair0_cfg[0].rx_freq[i],i);
s->usrp->set_rx_gain(openair0_cfg[0].rx_gain[i],i);
}
}
for(i=0;iusrp->get_tx_num_channels();i++) {
if (iusrp->set_tx_rate(openair0_cfg[0].sample_rate,i);
s->usrp->set_tx_bandwidth(openair0_cfg[0].tx_bw,i);
printf("Setting tx freq/gain on channel %d/%d\n",i,s->usrp->get_tx_num_channels());
s->usrp->set_tx_freq(openair0_cfg[0].tx_freq[i],i);
s->usrp->set_tx_gain(openair0_cfg[0].tx_gain[i],i);
}
}
// create tx & rx streamer
uhd::stream_args_t stream_args_rx("sc16", "sc16");
stream_args_rx.args["spp"] = str(boost::format("%d") % openair0_cfg[0].samples_per_packet);
uhd::stream_args_t stream_args_tx("sc16", "sc16");
stream_args_tx.args["spp"] = str(boost::format("%d") % openair0_cfg[0].samples_per_packet);
for (i = 0; itx_stream = s->usrp->get_tx_stream(stream_args_tx);
s->rx_stream = s->usrp->get_rx_stream(stream_args_rx);
s->usrp->set_time_now(uhd::time_spec_t(0.0));
// display USRP settings
for (i=0;iusrp->get_rx_rate(i)/1e6) << std::endl;
std::cout << boost::format("Actual RX frequency: %fGHz...") % (s->usrp->get_rx_freq(i)/1e9) << std::endl;
std::cout << boost::format("Actual RX gain: %f...") % (s->usrp->get_rx_gain(i)) << std::endl;
std::cout << boost::format("Actual RX bandwidth: %fM...") % (s->usrp->get_rx_bandwidth(i)/1e6) << std::endl;
std::cout << boost::format("Actual RX antenna: %s...") % (s->usrp->get_rx_antenna(i)) << std::endl;
}
}
for (i=0;iusrp->get_tx_rate(i)/1e6) << std::endl;
std::cout << boost::format("Actual TX frequency: %fGHz...") % (s->usrp->get_tx_freq(i)/1e9) << std::endl;
std::cout << boost::format("Actual TX gain: %f...") % (s->usrp->get_tx_gain(i)) << std::endl;
std::cout << boost::format("Actual TX bandwidth: %fM...") % (s->usrp->get_tx_bandwidth(i)/1e6) << std::endl;
std::cout << boost::format("Actual TX antenna: %s...") % (s->usrp->get_tx_antenna(i)) << 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[0].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;
}