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//
// Copyright 2010 Ettus Research LLC
//
// This program 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.
//
// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
//
#include <complex>
#include <boost/shared_array.hpp>
#include <boost/format.hpp>
#include "usrp2_impl.hpp"
using namespace uhd;
using namespace uhd::usrp;
/***********************************************************************
* Constants
**********************************************************************/
typedef std::complex<float> fc32_t;
typedef std::complex<int16_t> sc16_t;
static const float float_scale_factor = pow(2.0, 15);
//max length with header, stream id, seconds, fractional seconds
static const size_t max_vrt_header_words = 5;
/***********************************************************************
* Helper Functions
**********************************************************************/
static inline void host_floats_to_usrp2_shorts(
int16_t *usrp2_shorts,
const float *host_floats,
size_t num_samps
){
for(size_t i = 0; i < num_samps; i++){
usrp2_shorts[i] = htons(int16_t(host_floats[i]*float_scale_factor));
}
}
static inline void usrp2_shorts_to_host_floats(
float *host_floats,
const int16_t *usrp2_shorts,
size_t num_samps
){
for(size_t i = 0; i < num_samps; i++){
host_floats[i] = float(ntohs(usrp2_shorts[i])/float_scale_factor);
}
}
static inline void host_shorts_to_usrp2_shorts(
int16_t *usrp2_shorts,
const int16_t *host_shorts,
size_t num_samps
){
for(size_t i = 0; i < num_samps; i++){
usrp2_shorts[i] = htons(host_shorts[i]);
}
}
static inline void usrp2_shorts_to_host_shorts(
int16_t *host_shorts,
const int16_t *usrp2_shorts,
size_t num_samps
){
for(size_t i = 0; i < num_samps; i++){
host_shorts[i] = ntohs(usrp2_shorts[i]);
}
}
/***********************************************************************
* Send Raw Data
**********************************************************************/
size_t usrp2_impl::send_raw(
const boost::asio::const_buffer &buff,
const uhd::metadata_t &metadata
){
std::vector<boost::asio::const_buffer> buffs(2);
uint32_t vrt_hdr[max_vrt_header_words];
uint32_t vrt_hdr_flags = 0;
size_t num_vrt_hdr_words = 1;
//load the vrt header and flags
if(metadata.has_stream_id){
vrt_hdr_flags |= (0x1 << 28); //IF Data packet with Stream Identifier
vrt_hdr[num_vrt_hdr_words++] = htonl(metadata.stream_id);
}
if(metadata.has_time_spec){
vrt_hdr_flags |= (0x3 << 22) | (0x1 << 20); //TSI: Other, TSF: Sample Count Timestamp
vrt_hdr[num_vrt_hdr_words++] = htonl(metadata.time_spec.secs);
vrt_hdr[num_vrt_hdr_words++] = htonl(metadata.time_spec.ticks);
vrt_hdr[num_vrt_hdr_words++] = 0; //unused part of fractional seconds
}
vrt_hdr_flags |= (metadata.start_of_burst)? (0x1 << 25) : 0;
vrt_hdr_flags |= (metadata.end_of_burst)? (0x1 << 24) : 0;
//fill in complete header word
vrt_hdr[0] = htonl(vrt_hdr_flags |
((_stream_id_to_packet_seq[metadata.stream_id]++ & 0xf) << 16) |
((boost::asio::buffer_size(buff)/sizeof(uint32_t)) & 0xffff)
);
//load the buffer vector
size_t vrt_hdr_size = num_vrt_hdr_words*sizeof(uint32_t);
buffs[0] = boost::asio::buffer(&vrt_hdr, vrt_hdr_size);
buffs[1] = buff;
//send and return number of samples
return (_data_transport->send(buffs) - vrt_hdr_size)/sizeof(sc16_t);
}
/***********************************************************************
* Receive Raw Data
**********************************************************************/
size_t usrp2_impl::recv_raw(
const boost::asio::mutable_buffer &buff,
uhd::metadata_t &metadata
){
//load the buffer vector
std::vector<boost::asio::mutable_buffer> buffs(2);
uint32_t vrt_hdr[max_vrt_header_words];
buffs[0] = boost::asio::buffer(vrt_hdr, max_vrt_header_words);
buffs[1] = buff;
//receive into the buffers
size_t bytes_recvd = _data_transport->recv(buffs);
//failure case
if (bytes_recvd < max_vrt_header_words*sizeof(uint32_t)) return 0;
//unpack the vrt header
metadata = uhd::metadata_t();
uint32_t vrt_header = ntohl(vrt_hdr[0]);
metadata.has_stream_id = true;
metadata.stream_id = ntohl(vrt_hdr[1]);
metadata.has_time_spec = true;
metadata.time_spec.secs = ntohl(vrt_hdr[2]);
metadata.time_spec.ticks = ntohl(vrt_hdr[3]);
//return the number of samples received
size_t num_words = vrt_header & 0xffff;
return (num_words*sizeof(uint32_t))/sizeof(sc16_t);
}
/***********************************************************************
* Send Data
**********************************************************************/
size_t usrp2_impl::send(
const boost::asio::const_buffer &buff,
const uhd::metadata_t &metadata,
const std::string &type
){
if (type == "fc32"){
size_t num_samps = boost::asio::buffer_size(buff)/sizeof(fc32_t);
boost::shared_array<sc16_t> raw_mem(new sc16_t[num_samps]);
boost::asio::mutable_buffer raw_buff(raw_mem.get(), num_samps*sizeof(sc16_t));
host_floats_to_usrp2_shorts(
boost::asio::buffer_cast<int16_t*>(raw_buff),
boost::asio::buffer_cast<const float*>(buff),
num_samps*2 //double for complex
);
return send_raw(raw_buff, metadata);
}
if (type == "sc16"){
#ifdef HAVE_BIG_ENDIAN
return send_raw(buff, metadata);
#else
size_t num_samps = boost::asio::buffer_size(buff)/sizeof(sc16_t);
boost::shared_array<sc16_t> raw_mem(new sc16_t[num_samps]);
boost::asio::mutable_buffer raw_buff(raw_mem.get(), num_samps*sizeof(sc16_t));
host_shorts_to_usrp2_shorts(
boost::asio::buffer_cast<int16_t*>(raw_buff),
boost::asio::buffer_cast<const int16_t*>(buff),
num_samps*2 //double for complex
);
return send_raw(raw_buff, metadata);
#endif
}
throw std::runtime_error(str(boost::format("usrp2 send: cannot handle type \"%s\"") % type));
}
/***********************************************************************
* Receive Data
**********************************************************************/
size_t usrp2_impl::recv(
const boost::asio::mutable_buffer &buff,
uhd::metadata_t &metadata,
const std::string &type
){
if (type == "fc32"){
size_t num_samps = boost::asio::buffer_size(buff)/sizeof(fc32_t);
boost::shared_array<sc16_t> raw_mem(new sc16_t[num_samps]);
boost::asio::mutable_buffer raw_buff(raw_mem.get(), num_samps*sizeof(sc16_t));
num_samps = recv_raw(raw_buff, metadata);
usrp2_shorts_to_host_floats(
boost::asio::buffer_cast<float*>(buff),
boost::asio::buffer_cast<const int16_t*>(raw_buff),
num_samps*2 //double for complex
);
return num_samps;
}
if (type == "sc16"){
#ifdef HAVE_BIG_ENDIAN
return recv_raw(buff, metadata);
#else
size_t num_samps = boost::asio::buffer_size(buff)/sizeof(sc16_t);
boost::shared_array<sc16_t> raw_mem(new sc16_t[num_samps]);
boost::asio::mutable_buffer raw_buff(raw_mem.get(), num_samps*sizeof(sc16_t));
num_samps = recv_raw(raw_buff, metadata);
usrp2_shorts_to_host_shorts(
boost::asio::buffer_cast<int16_t*>(buff),
boost::asio::buffer_cast<const int16_t*>(raw_buff),
num_samps*2 //double for complex
);
return num_samps;
#endif
}
throw std::runtime_error(str(boost::format("usrp2 recv: cannot handle type \"%s\"") % type));
}
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