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//
// Copyright 2012 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 "usrp2_regs.hpp"
#include <uhd/exception.hpp>
#include <uhd/utils/msg.hpp>
#include <uhd/transport/vrt_if_packet.hpp>
#include "usrp2_fifo_ctrl.hpp"
#include <boost/thread/mutex.hpp>
#include <boost/asio.hpp> //htonl
using namespace uhd::transport;
static const size_t POKE32_CMD = (1 << 8);
static const size_t PEEK32_CMD = 0;
static const double ACK_TIMEOUT = 0.5;
static const boost::uint32_t MAX_SEQS_OUT = 16;
class usrp2_fifo_ctrl_impl : public usrp2_fifo_ctrl{
public:
usrp2_fifo_ctrl_impl(zero_copy_if::sptr xport):
_xport(xport),
_seq(0), _last_seq_ack(0)
{
while (_xport->get_recv_buff(0.0)){} //flush
}
UHD_INLINE void send_pkt(wb_addr_type addr, boost::uint32_t data, int cmd){
managed_send_buffer::sptr buff = _xport->get_send_buff(0.0);
if (not buff){
throw uhd::runtime_error("fifo ctrl timed out getting a send buffer");
}
boost::uint32_t *trans = buff->cast<boost::uint32_t *>();
trans[0] = htonl(++_seq);
boost::uint32_t *pkt = trans + 1;
//load packet info
vrt::if_packet_info_t packet_info;
packet_info.packet_type = vrt::if_packet_info_t::PACKET_TYPE_CONTEXT;
packet_info.num_payload_words32 = 2;
packet_info.num_payload_bytes = packet_info.num_payload_words32*sizeof(boost::uint32_t);
packet_info.packet_count = _seq;
packet_info.sob = false;
packet_info.eob = false;
packet_info.has_sid = false;
packet_info.has_cid = false;
packet_info.has_tsi = false;
packet_info.has_tsf = false;
packet_info.has_tlr = false;
//load header
vrt::if_hdr_pack_be(pkt, packet_info);
//load payload
const boost::uint32_t ctrl_word = (addr & 0xff) | cmd | (_seq << 16);
pkt[packet_info.num_header_words32+0] = htonl(ctrl_word);
pkt[packet_info.num_header_words32+1] = htonl(data);
//send the buffer over the interface
buff->commit(sizeof(boost::uint32_t)*(packet_info.num_packet_words32+1));
}
void poke32(wb_addr_type addr, boost::uint32_t data){
boost::mutex::scoped_lock lock(_mutex);
this->send_pkt((addr - SETTING_REGS_BASE)/4, data, POKE32_CMD);
this->wait_for_ack(boost::int16_t(_seq-MAX_SEQS_OUT));
}
boost::uint32_t peek32(wb_addr_type addr){
boost::mutex::scoped_lock lock(_mutex);
this->send_pkt((addr - READBACK_BASE)/4, 0, PEEK32_CMD);
return this->wait_for_ack(boost::int16_t(_seq));
}
boost::uint32_t wait_for_ack(const boost::int16_t seq_to_ack){
while (_last_seq_ack < seq_to_ack){
managed_recv_buffer::sptr buff = _xport->get_recv_buff(ACK_TIMEOUT);
if (not buff){
throw uhd::runtime_error("fifo ctrl timed out looking for acks");
}
const boost::uint32_t *pkt = buff->cast<const boost::uint32_t *>();
vrt::if_packet_info_t packet_info;
packet_info.num_packet_words32 = buff->size()/sizeof(boost::uint32_t);
vrt::if_hdr_unpack_be(pkt, packet_info);
_last_seq_ack = ntohl(pkt[packet_info.num_header_words32+0]) >> 16;
if (_last_seq_ack == seq_to_ack){
return ntohl(pkt[packet_info.num_header_words32+1]);
}
}
return 0;
}
void poke16(wb_addr_type, boost::uint16_t){
throw uhd::not_implemented_error("poke16 not implemented in fifo ctrl module");
}
boost::uint16_t peek16(wb_addr_type){
throw uhd::not_implemented_error("peek16 not implemented in fifo ctrl module");
}
private:
zero_copy_if::sptr _xport;
boost::mutex _mutex;
boost::uint32_t _seq;
boost::uint16_t _last_seq_ack;
};
usrp2_fifo_ctrl::sptr usrp2_fifo_ctrl::make(zero_copy_if::sptr xport){
return sptr(new usrp2_fifo_ctrl_impl(xport));
}
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