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//
// Copyright 2014-2016 Ettus Research LLC
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: GPL-3.0-or-later
//
#include <iostream>
#include <string>
#include <chrono>
#include <thread>
#include <string.h>
#include <stdint.h>
#include <boost/algorithm/string.hpp>
#include <boost/asio.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 MAX_CACHE_AGE 256 //seconds
namespace uhd{
octoclock_uart_iface::octoclock_uart_iface(udp_simple::sptr udp, uint32_t proto_ver): uart_iface(){
_udp = udp;
_state.num_wraps = 0;
_state.pos = 0;
_device_state.num_wraps = 0;
_device_state.pos = 0;
_proto_ver = proto_ver;
// To avoid replicating sequence numbers between sessions
_sequence = uint32_t(std::rand());
size_t len = 0;
//Get pool size from device
octoclock_packet_t pkt_out;
pkt_out.sequence = uhd::htonx<uint32_t>(_sequence);
pkt_out.len = 0;
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, _proto_ver, 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){
size_t len = 0;
octoclock_packet_t pkt_out;
pkt_out.sequence = uhd::htonx<uint32_t>(++_sequence);
pkt_out.len = buf.size();
memcpy(pkt_out.data, buf.c_str(), buf.size());
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, _proto_ver, 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;
const auto exit_time =
std::chrono::steady_clock::now()
+ std::chrono::milliseconds(int64_t(timeout*1e3));
while(true)
{
_update_cache();
for(char ch = _getchar(); ch != 0; ch = _getchar()){
_rxbuff += ch;
//If newline found, return string
if(ch == '\n'){
result.swap(_rxbuff);
return result;
}
}
if (std::chrono::steady_clock::now() > exit_time) {
break;
}
std::this_thread::sleep_for(std::chrono::milliseconds(1));
}
return result;
}
void octoclock_uart_iface::_update_cache(){
octoclock_packet_t pkt_out;
pkt_out.len = 0;
size_t len = 0;
uint8_t octoclock_data[udp_simple::mtu];
const octoclock_packet_t *pkt_in = reinterpret_cast<octoclock_packet_t*>(octoclock_data);
if(STATES_EQUAL){
boost::system_time time = boost::get_system_time();
boost::posix_time::time_duration age = time - _last_cache_update;
bool cache_expired = (age > boost::posix_time::seconds(MAX_CACHE_AGE));
pkt_out.sequence = uhd::htonx<uint32_t>(++_sequence);
UHD_OCTOCLOCK_SEND_AND_RECV(_udp, _proto_ver, 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;
_last_cache_update = time;
}
uint8_t delta_wraps = (_device_state.num_wraps - _state.num_wraps);
if(cache_expired or delta_wraps > 1 or
((delta_wraps == 1) and (_device_state.pos > _state.pos))){
_state.pos = _device_state.pos;
_state.num_wraps = (_device_state.num_wraps-1);
_rxbuff.clear();
while((_cache[_state.pos] != '\n')){
_state.pos = (_state.pos+1) % _poolsize;
//We may have wrapped around locally
if(_state.pos == 0) _state.num_wraps++;
if(STATES_EQUAL) break;
}
if (_cache[_state.pos] == '\n'){
_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(STATES_EQUAL){
return 0;
}
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, uint32_t proto_ver){
return uart_iface::sptr(new octoclock_uart_iface(udp, proto_ver));
}
}
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