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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 "usrp_e_impl.hpp"
#include "../../transport/vrt_packet_handler.hpp"
#include <boost/bind.hpp>
#include <fcntl.h> //read, write
#include <linux/usrp_e.h> //transfer frame struct
#include <stddef.h> //offsetof
using namespace uhd;
static const size_t MAX_BUFF_SIZE = 2048;
/***********************************************************************
* Data Transport (phony zero-copy with read/write)
**********************************************************************/
class data_transport:
public transport::phony_zero_copy_recv_if,
public transport::phony_zero_copy_send_if
{
public:
data_transport(int fd):
transport::phony_zero_copy_recv_if(MAX_BUFF_SIZE),
transport::phony_zero_copy_send_if(MAX_BUFF_SIZE),
_fd(fd)
{
/* NOP */
}
size_t get_num_recv_frames(void) const{
return 10; //FIXME no idea!
}
size_t get_num_send_frames(void) const{
return 10; //FIXME no idea!
}
private:
int _fd;
size_t send(const boost::asio::const_buffer &buff){
//Set the frame length in the frame header.
//This is technically bad to write to a const buffer,
//but this will go away when the ring gets implemented,
//and the send buffer commit method will set the length.
const_cast<usrp_transfer_frame *>(
boost::asio::buffer_cast<const usrp_transfer_frame *>(buff)
)->len = boost::asio::buffer_size(buff);
return write(
_fd,
boost::asio::buffer_cast<const void *>(buff),
boost::asio::buffer_size(buff)
);
}
size_t recv(const boost::asio::mutable_buffer &buff){
return read(
_fd,
boost::asio::buffer_cast<void *>(buff),
boost::asio::buffer_size(buff)
);
}
};
/***********************************************************************
* IO Implementation Details
**********************************************************************/
struct usrp_e_impl::io_impl{
vrt_packet_handler::recv_state recv_state;
vrt_packet_handler::send_state send_state;
data_transport transport;
io_impl(int fd): transport(fd){}
};
void usrp_e_impl::io_init(void){
_io_impl = UHD_PIMPL_MAKE(io_impl, (_iface->get_file_descriptor()));
}
/***********************************************************************
* Data Send
**********************************************************************/
size_t usrp_e_impl::send(
const boost::asio::const_buffer &buff,
const uhd::tx_metadata_t &metadata,
const io_type_t & io_type,
send_mode_t send_mode
){
otw_type_t send_otw_type;
send_otw_type.width = 16;
send_otw_type.shift = 0;
send_otw_type.byteorder = otw_type_t::BO_NATIVE;
return vrt_packet_handler::send(
_io_impl->send_state,
buff,
metadata,
send_mode,
io_type,
send_otw_type, //TODO
64e6, //TODO
boost::bind(&data_transport::get_send_buff, &_io_impl->transport),
(MAX_BUFF_SIZE - sizeof(usrp_transfer_frame))/send_otw_type.get_sample_size(),
offsetof(usrp_transfer_frame, buf)
);
}
/***********************************************************************
* Data Recv
**********************************************************************/
size_t usrp_e_impl::recv(
const boost::asio::mutable_buffer &buff,
uhd::rx_metadata_t &metadata,
const io_type_t &io_type,
recv_mode_t recv_mode
){
otw_type_t recv_otw_type;
recv_otw_type.width = 16;
recv_otw_type.shift = 0;
recv_otw_type.byteorder = otw_type_t::BO_NATIVE;
return vrt_packet_handler::recv(
_io_impl->recv_state,
buff,
metadata,
recv_mode,
io_type,
recv_otw_type, //TODO
64e6, //TODO
boost::bind(&data_transport::get_recv_buff, &_io_impl->transport),
offsetof(usrp_transfer_frame, buf)
);
}
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