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//
// Copyright 2019 Ettus Research, a National Instruments Brand
//
// SPDX-License-Identifier: GPL-3.0-or-later
//
#include <uhd/exception.hpp>
#include <uhd/rfnoc/mb_controller.hpp>
#include <uhd/utils/algorithm.hpp>
#include <uhd/utils/log.hpp>
#include <atomic>
#include <chrono>
#include <thread>
using namespace uhd::rfnoc;
using namespace std::chrono_literals;
namespace {
const std::vector<std::string> SYNCHRONIZABLE_REF_SOURCES = {"gpsdo", "external"};
}
bool mb_controller::synchronize(std::vector<mb_controller::sptr>& mb_controllers,
const uhd::time_spec_t& time_spec,
const bool quiet)
{
if (mb_controllers.empty()) {
return false;
}
if (mb_controllers.size() == 1) {
UHD_LOG_TRACE("MB_CTRL", "Skipping time synchronization of a single USRP.");
mb_controllers.at(0)->get_timekeeper(0)->set_time_now(time_spec);
return true;
}
// Verify that all devices share a time reference, and that it is a common
// one
const std::string time_source = mb_controllers.at(0)->get_time_source();
if (!uhd::has(SYNCHRONIZABLE_REF_SOURCES, time_source)) {
if (!quiet) {
UHD_LOG_WARNING("MB_CTRL",
"The selected time source "
<< time_source << " does not allow synchronization between devices.");
}
return false;
}
for (auto& mbc : mb_controllers) {
if (mbc->get_time_source() != time_source) {
if (!quiet) {
UHD_LOG_WARNING("MB_CTRL",
"Motherboards do not share a time source, and thus cannot be "
"synchronized!");
}
return false;
}
}
// Get a reference to all timekeepers
std::vector<timekeeper::sptr> timekeepers;
timekeepers.reserve(mb_controllers.size());
for (auto& mbc : mb_controllers) {
// If we also want to sync other timekeepers, this would be the place to
// do that
timekeepers.push_back(mbc->get_timekeeper(0));
}
if (!quiet) {
UHD_LOGGER_INFO("MB_CTRL") << " 1) catch time transition at pps edge";
}
const auto end_time = std::chrono::steady_clock::now() + 1100ms;
const time_spec_t time_start_last_pps = timekeepers.front()->get_time_last_pps();
while (time_start_last_pps == timekeepers.front()->get_time_last_pps()) {
if (std::chrono::steady_clock::now() > end_time) {
// This is always bad, and we'll throw regardless of quiet
throw uhd::runtime_error("Board 0 may not be getting a PPS signal!\n"
"No PPS detected within the time interval.\n"
"See the application notes for your device.\n");
}
std::this_thread::sleep_for(1ms);
}
if (!quiet) {
UHD_LOGGER_INFO("MB_CTRL") << " 2) set times next pps (synchronously)";
}
for (auto& timekeeper : timekeepers) {
timekeeper->set_time_next_pps(time_spec);
}
std::this_thread::sleep_for(1s);
// verify that the time registers are read to be within a few RTT
size_t m = 0;
for (auto& timekeeper : timekeepers) {
time_spec_t time_0 = timekeepers.front()->get_time_now();
time_spec_t time_i = timekeeper->get_time_now();
// 10 ms: greater than RTT but not too big
constexpr double MAX_DEVIATION = 0.01;
if (time_i < time_0 or (time_i - time_0) > time_spec_t(MAX_DEVIATION)) {
if (!quiet) {
UHD_LOGGER_WARNING("MULTI_USRP")
<< boost::format(
"Detected time deviation between board %d and board 0.\n"
"Board 0 time is %f seconds.\n"
"Board %d time is %f seconds.\n")
% m % time_0.get_real_secs() % m % time_i.get_real_secs();
}
return false;
}
m++;
}
return true;
}
/******************************************************************************
* Timekeeper API
*****************************************************************************/
mb_controller::timekeeper::timekeeper()
{
// nop
}
uhd::time_spec_t mb_controller::timekeeper::get_time_now()
{
return time_spec_t::from_ticks(get_ticks_now(), _tick_rate);
}
uhd::time_spec_t mb_controller::timekeeper::get_time_last_pps()
{
return time_spec_t::from_ticks(get_ticks_last_pps(), _tick_rate);
}
void mb_controller::timekeeper::set_time_now(const uhd::time_spec_t& time)
{
set_ticks_now(time.to_ticks(_tick_rate));
}
void mb_controller::timekeeper::set_time_next_pps(const uhd::time_spec_t& time)
{
set_ticks_next_pps(time.to_ticks(_tick_rate));
}
void mb_controller::timekeeper::set_tick_rate(const double tick_rate)
{
if (_tick_rate == tick_rate) {
return;
}
_tick_rate = tick_rate;
// The period is the inverse of the tick rate, normalized by nanoseconds,
// and represented as Q32 (e.g., period == 1ns means period_ns == 1<<32)
const uint64_t period_ns =
static_cast<uint64_t>(1e9 / tick_rate * (uint64_t(1) << 32));
set_period(period_ns);
}
size_t mb_controller::get_num_timekeepers() const
{
return _timekeepers.size();
}
mb_controller::timekeeper::sptr mb_controller::get_timekeeper(const size_t tk_idx) const
{
if (!_timekeepers.count(tk_idx)) {
throw uhd::index_error(
std::string("No timekeeper with index ") + std::to_string(tk_idx));
}
return _timekeepers.at(tk_idx);
}
void mb_controller::register_timekeeper(const size_t idx, timekeeper::sptr tk)
{
_timekeepers.emplace(idx, std::move(tk));
}
std::vector<std::string> mb_controller::get_gpio_banks() const
{
return {};
}
std::vector<std::string> mb_controller::get_gpio_srcs(const std::string&) const
{
throw uhd::not_implemented_error(
"get_gpio_srcs() not supported on this motherboard!");
}
std::vector<std::string> mb_controller::get_gpio_src(const std::string&)
{
throw uhd::not_implemented_error("get_gpio_src() not supported on this motherboard!");
}
void mb_controller::set_gpio_src(const std::string&, const std::vector<std::string>&)
{
throw uhd::not_implemented_error("set_gpio_src() not supported on this motherboard!");
}
void mb_controller::register_sync_source_updater(mb_controller::sync_source_updater_t)
{
throw uhd::not_implemented_error(
"register_sync_source_updater() not supported on this motherboard!");
}
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