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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 "../../transport/vrt_packet_handler.hpp"
#include "usrp_commands.h"
#include "usrp1_impl.hpp"
#include <uhd/utils/thread_priority.hpp>
#include <uhd/transport/convert_types.hpp>
#include <uhd/transport/bounded_buffer.hpp>
#include <boost/bind.hpp>
#include <boost/format.hpp>
#include <boost/asio.hpp>
#include <boost/bind.hpp>
#include <boost/thread.hpp>
#include <iostream>
using namespace uhd;
using namespace uhd::usrp;
using namespace uhd::transport;
namespace asio = boost::asio;
/*
* The FX2 firmware bursts data to the FPGA in 512 byte chunks so
* maintain send state to make sure that happens.
*/
struct usrp1_send_state {
uhd::transport::managed_send_buffer::sptr send_buff;
size_t bytes_used;
size_t bytes_free;
};
/***********************************************************************
* IO Implementation Details
**********************************************************************/
struct usrp1_impl::io_impl {
io_impl(zero_copy_if::sptr zc_if);
~io_impl(void);
bool get_recv_buff(managed_recv_buffer::sptr buff);
//state management for the vrt packet handler code
vrt_packet_handler::recv_state packet_handler_recv_state;
usrp1_send_state send_state;
zero_copy_if::sptr data_transport;
unsigned int count;
};
usrp1_impl::io_impl::io_impl(zero_copy_if::sptr zc_if)
: packet_handler_recv_state(1), data_transport(zc_if), count(0)
{
/* NOP */
}
usrp1_impl::io_impl::~io_impl(void)
{
/* NOP */
}
void usrp1_impl::io_init(void)
{
_rx_otw_type.width = 16;
_rx_otw_type.shift = 0;
_rx_otw_type.byteorder = otw_type_t::BO_LITTLE_ENDIAN;
_tx_otw_type.width = 16;
_tx_otw_type.shift = 0;
_tx_otw_type.byteorder = otw_type_t::BO_LITTLE_ENDIAN;
_io_impl = UHD_PIMPL_MAKE(io_impl, (_data_transport));
}
/***********************************************************************
* Data Send
**********************************************************************/
size_t usrp1_impl::send(const std::vector<const void *> &buffs,
size_t num_samps,
const tx_metadata_t &,
const io_type_t &io_type,
send_mode_t)
{
UHD_ASSERT_THROW(buffs.size() == 1);
size_t total_samps_sent = 0;
while (total_samps_sent < num_samps) {
if (_io_impl->send_state.send_buff == NULL) {
_io_impl->send_state.send_buff = _data_transport->get_send_buff();
if (_io_impl->send_state.send_buff == NULL) {
return 0;
}
_io_impl->send_state.bytes_used = 0;
_io_impl->send_state.bytes_free = _io_impl->send_state.send_buff->size();
}
size_t copy_samps =
std::min(num_samps - total_samps_sent, _io_impl->send_state.bytes_free / _tx_otw_type.get_sample_size());
const boost::uint8_t *io_mem =
reinterpret_cast<const boost::uint8_t *>(buffs[0]);
boost::uint8_t *otw_mem = _io_impl->send_state.send_buff->cast<boost::uint8_t *>();
// Type conversion and copy
convert_io_type_to_otw_type(
io_mem + total_samps_sent * io_type.size,
io_type,
otw_mem + _io_impl->send_state.bytes_used,
_tx_otw_type,
copy_samps);
_io_impl->send_state.bytes_used += copy_samps * _tx_otw_type.get_sample_size();
_io_impl->send_state.bytes_free -= copy_samps * _tx_otw_type.get_sample_size();
if (_io_impl->send_state.bytes_free == 0) {
_io_impl->send_state.send_buff->commit(_io_impl->send_state.bytes_used);
_io_impl->send_state.send_buff = uhd::transport::managed_send_buffer::sptr();
}
total_samps_sent += copy_samps;
//check for underruns
if (!(_io_impl->count++ % 1000)) {
unsigned char underrun;
int ret = _ctrl_transport->usrp_control_read(VRQ_GET_STATUS,
0,
GS_TX_UNDERRUN,
&underrun, sizeof(char));
if (ret < 0)
std::cerr << "error: underrun check failed" << std::endl;
if (underrun)
std::cerr << "U" << std::endl;
}
}
return total_samps_sent;
}
/***********************************************************************
* Data Recv
**********************************************************************/
void _recv_helper(vrt_packet_handler::recv_state &state)
{
size_t num_packet_words32 =
state.managed_buffs[0]->size() / sizeof(boost::uint32_t);
const boost::uint32_t *data =
state.managed_buffs[0]->cast<const boost::uint32_t *>();
state.copy_buffs[0] = reinterpret_cast<const boost::uint8_t *>(data);
size_t num_payload_bytes = num_packet_words32 * sizeof(boost::uint32_t);
state.size_of_copy_buffs = num_payload_bytes;
}
size_t usrp1_impl::recv(const std::vector<void *> &buffs,
size_t num_samps,
rx_metadata_t &,
const io_type_t &io_type,
recv_mode_t,
size_t)
{
UHD_ASSERT_THROW(_io_impl->packet_handler_recv_state.width == 1);
UHD_ASSERT_THROW(buffs.size() == 1);
size_t sent_samps = 0;
size_t nsamps_to_copy = 0;;
while (sent_samps < num_samps) {
if (_io_impl->packet_handler_recv_state.size_of_copy_buffs == 0) {
_io_impl->packet_handler_recv_state.fragment_offset_in_samps = 0;
_io_impl->packet_handler_recv_state.managed_buffs[0] =
_io_impl->data_transport->get_recv_buff();
//timeout or something bad returns zero
if (!_io_impl->packet_handler_recv_state.managed_buffs[0].get())
return 0;
_recv_helper(_io_impl->packet_handler_recv_state);
}
size_t bytes_per_item = _rx_otw_type.get_sample_size();
size_t nsamps_available =
_io_impl->packet_handler_recv_state.size_of_copy_buffs / bytes_per_item;
nsamps_to_copy = std::min(num_samps, nsamps_available);
size_t bytes_to_copy = nsamps_to_copy * bytes_per_item;
convert_otw_type_to_io_type(
_io_impl->packet_handler_recv_state.copy_buffs[0],
_rx_otw_type,
reinterpret_cast<boost::uint8_t *>(buffs[0]) + sent_samps * io_type.size,
io_type,
nsamps_to_copy);
_io_impl->packet_handler_recv_state.copy_buffs[0] += bytes_to_copy;
_io_impl->packet_handler_recv_state.size_of_copy_buffs -= bytes_to_copy;
sent_samps += nsamps_to_copy;
//check for overruns
if (!(_io_impl->count++ % 10000)) {
unsigned char overrun;
int ret = _ctrl_transport->usrp_control_read(
VRQ_GET_STATUS,
0,
GS_RX_OVERRUN,
&overrun, sizeof(char));
if (ret < 0)
std::cerr << "error: overrun check failed" << std::endl;
if (overrun)
std::cerr << "O" << std::endl;
}
}
return sent_samps;
}
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