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//
// Copyright 2013 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 "n230_uart.hpp"
#include <uhd/transport/bounded_buffer.hpp>
#include <uhd/transport/vrt_if_packet.hpp>
#include <uhd/utils/byteswap.hpp>
#include <uhd/utils/msg.hpp>
#include <uhd/types/time_spec.hpp>
#include <uhd/exception.hpp>
using namespace uhd;
using namespace uhd::transport;
namespace uhd { namespace usrp { namespace n230 {
struct n230_uart_impl : n230_uart
{
n230_uart_impl(zero_copy_if::sptr xport, const boost::uint32_t sid):
_xport(xport),
_sid(sid),
_count(0),
_char_queue(4096)
{
//this default baud divider is over 9000
this->set_baud_divider(9001);
//create a task to handle incoming packets
_recv_task = uhd::task::make(boost::bind(&n230_uart_impl::handle_recv, this));
}
void send_char(const char ch)
{
managed_send_buffer::sptr buff = _xport->get_send_buff();
UHD_ASSERT_THROW(bool(buff));
vrt::if_packet_info_t packet_info;
packet_info.link_type = vrt::if_packet_info_t::LINK_TYPE_CHDR;
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 = _count++;
packet_info.sob = false;
packet_info.eob = false;
packet_info.sid = _sid;
packet_info.has_sid = true;
packet_info.has_cid = false;
packet_info.has_tsi = false;
packet_info.has_tsf = false;
packet_info.has_tlr = false;
boost::uint32_t *packet_buff = buff->cast<boost::uint32_t *>();
vrt::if_hdr_pack_le(packet_buff, packet_info);
packet_buff[packet_info.num_header_words32+0] = uhd::htonx(boost::uint32_t(_baud_div));
packet_buff[packet_info.num_header_words32+1] = uhd::htonx(boost::uint32_t(ch));
buff->commit(packet_info.num_packet_words32*sizeof(boost::uint32_t));
}
void write_uart(const std::string &buff)
{
static bool r_sent = false;
for (size_t i = 0; i < buff.size(); i++)
{
if (buff[i] == '\n' and not r_sent) this->send_char('\r');
this->send_char(buff[i]);
r_sent = (buff[i] == '\r');
}
}
std::string read_uart(double timeout)
{
std::string line;
char ch = '\0';
while (_char_queue.pop_with_timed_wait(ch, timeout))
{
if (ch == '\r') continue;
line += std::string(&ch, 1);
if (ch == '\n') return line;
}
return line;
}
void handle_recv(void)
{
managed_recv_buffer::sptr buff = _xport->get_recv_buff();
if (not buff)
return;
const boost::uint32_t *packet_buff = buff->cast<const boost::uint32_t *>();
vrt::if_packet_info_t packet_info;
packet_info.link_type = vrt::if_packet_info_t::LINK_TYPE_CHDR;
packet_info.num_packet_words32 = buff->size()/sizeof(boost::uint32_t);
vrt::if_hdr_unpack_be(packet_buff, packet_info);
const char ch = char(uhd::ntohx(packet_buff[packet_info.num_header_words32+1]));
_char_queue.push_with_pop_on_full(ch);
}
void set_baud_divider(const double baud_div)
{
_baud_div = size_t(baud_div + 0.5);
}
const zero_copy_if::sptr _xport;
const boost::uint32_t _sid;
size_t _count;
size_t _baud_div;
bounded_buffer<char> _char_queue;
uhd::task::sptr _recv_task;
};
n230_uart::sptr n230_uart::make(zero_copy_if::sptr xport, const boost::uint32_t sid)
{
return n230_uart::sptr(new n230_uart_impl(xport, sid));
}
}}} //namespace
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