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//
// Copyright 2014 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 <iostream>
#include <string>
#include <string.h>
#include <boost/algorithm/string.hpp>
#include <boost/asio.hpp>
#include <boost/cstdint.hpp>
#include <boost/format.hpp>
#include <boost/thread/thread.hpp>
#include <uhd/exception.hpp>
#include <uhd/utils/byteswap.hpp>
#include "common.h"
#include "octoclock_uart.hpp"
namespace asio = boost::asio;
using namespace uhd::transport;
#define NUM_WRAPS_EQUAL (_state.num_wraps == _device_state.num_wraps)
#define POS_EQUAL (_state.pos == _device_state.pos)
#define STATES_EQUAL (NUM_WRAPS_EQUAL && POS_EQUAL)
#define LOCAL_STATE_AHEAD (_state.num_wraps > _device_state.num_wraps || \
(NUM_WRAPS_EQUAL && _state.pos > _device_state.pos))
namespace uhd{
octoclock_uart_iface::octoclock_uart_iface(udp_simple::sptr udp): uart_iface(){
_udp = udp;
_state.num_wraps = 0;
_state.pos = 0;
_device_state.num_wraps = 0;
_device_state.pos = 0;
size_t len = 0;
//Get pool size from device
octoclock_packet_t pkt_out;
pkt_out.sequence = uhd::htonx<boost::uint16_t>(std::rand());
pkt_out.len = 0;
boost::uint8_t octoclock_data[udp_simple::mtu];
const octoclock_packet_t *pkt_in = reinterpret_cast<octoclock_packet_t*>(octoclock_data);
UHD_OCTOCLOCK_SEND_AND_RECV(_udp, SEND_POOLSIZE_CMD, pkt_out, len, octoclock_data);
if(UHD_OCTOCLOCK_PACKET_MATCHES(SEND_POOLSIZE_ACK, pkt_out, pkt_in, len)){
_poolsize = pkt_in->poolsize;
_cache.resize(_poolsize);
}
else throw uhd::runtime_error("Failed to communicate with GPSDO.");
}
void octoclock_uart_iface::write_uart(const std::string &buf){
std::string to_send = boost::algorithm::replace_all_copy(buf, "\n", "\r\n");
size_t len = 0;
octoclock_packet_t pkt_out;
pkt_out.sequence = uhd::htonx<boost::uint32_t>(std::rand());
pkt_out.len = to_send.size();
memcpy(pkt_out.data, to_send.c_str(), to_send.size());
boost::uint8_t octoclock_data[udp_simple::mtu];
const octoclock_packet_t *pkt_in = reinterpret_cast<octoclock_packet_t*>(octoclock_data);
UHD_OCTOCLOCK_SEND_AND_RECV(_udp, HOST_SEND_TO_GPSDO_CMD, pkt_out, len, octoclock_data);
if(not UHD_OCTOCLOCK_PACKET_MATCHES(HOST_SEND_TO_GPSDO_ACK, pkt_out, pkt_in, len)){
throw uhd::runtime_error("Failed to send commands to GPSDO.");
}
}
std::string octoclock_uart_iface::read_uart(double timeout){
std::string result;
boost::system_time exit_time = boost::get_system_time() + boost::posix_time::milliseconds(long(timeout*1e3));
while(boost::get_system_time() < exit_time){
_update_cache();
for(char ch = _getchar(); ch != -1; ch = _getchar()){
if(ch == '\r') continue; //Skip carriage returns
_rxbuff += ch;
//If newline found, return string
if(ch == '\n'){
result = _rxbuff;
_rxbuff.clear();
return result;
}
}
boost::this_thread::sleep(boost::posix_time::milliseconds(1));
}
return result;
}
void octoclock_uart_iface::_update_cache(){
octoclock_packet_t pkt_out;
pkt_out.len = 0;
size_t len = 0;
boost::uint8_t octoclock_data[udp_simple::mtu];
const octoclock_packet_t *pkt_in = reinterpret_cast<octoclock_packet_t*>(octoclock_data);
if(STATES_EQUAL or LOCAL_STATE_AHEAD){
pkt_out.sequence++;
UHD_OCTOCLOCK_SEND_AND_RECV(_udp, SEND_GPSDO_CACHE_CMD, pkt_out, len, octoclock_data);
if(UHD_OCTOCLOCK_PACKET_MATCHES(SEND_GPSDO_CACHE_ACK, pkt_out, pkt_in, len)){
memcpy(&_cache[0], pkt_in->data, _poolsize);
_device_state = pkt_in->state;
}
boost::uint8_t delta_wraps = (_device_state.num_wraps - _state.num_wraps);
if(delta_wraps > 1 or
((delta_wraps == 1) and (_device_state.pos >= _state.pos))){
_state.pos = (_device_state.pos+1) % _poolsize;
_state.num_wraps = (_device_state.num_wraps-1);
while((_cache[_state.pos] != '\n') and (_state.pos != _device_state.pos)){
_state.pos = (_state.pos+1) % _poolsize;
//We may have wrapped around locally
if(_state.pos == 0) _state.num_wraps++;
}
_state.pos = (_state.pos+1) % _poolsize;
//We may have wrapped around locally
if(_state.pos == 0) _state.num_wraps++;
}
}
}
char octoclock_uart_iface::_getchar(){
if(LOCAL_STATE_AHEAD){
return -1;
}
char ch = _cache[_state.pos];
_state.pos = ((_state.pos+1) % _poolsize);
//We may have wrapped around locally
if(_state.pos == 0) _state.num_wraps++;
return ch;
}
uart_iface::sptr octoclock_make_uart_iface(udp_simple::sptr udp){
return uart_iface::sptr(new octoclock_uart_iface(udp));
}
}
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