clock.hpp

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//
// Copyright (c) 2019 Erwin Rol <erwin@erwinrol.com>
//
// SPDX-License-Identifier: Apache-2.0
//
 
#ifndef ZPP_INCLUDE_ZPP_CLOCK_HPP
#define ZPP_INCLUDE_ZPP_CLOCK_HPP
 
#include <zephyr/kernel.h>
#include <zephyr/sys_clock.h>
#include <zephyr/sys/__assert.h>
 
#include <chrono>
#include <limits>
 
namespace zpp {
 
class uptime_clock {
public:
  using rep = int64_t;
  using period = std::nano;
  using duration = std::chrono::duration<rep, period>;
  using time_point = std::chrono::time_point<uptime_clock>;
  static constexpr bool is_steady = false;
 
  static time_point now() noexcept
  {
    return time_point(duration(k_ticks_to_ns_floor64(k_uptime_ticks())));
  }
};
 
 
class cycle_clock {
public:
  using rep = uint64_t;
  using period = std::nano;
  using duration = std::chrono::duration<rep, period>;
  using time_point = std::chrono::time_point<cycle_clock>;
  static constexpr bool is_steady = false;
 
  static time_point now() noexcept
  {
    return time_point(duration(k_cyc_to_ns_floor64(k_cycle_get_32())));
  }
};
 
template<class T_Rep, class T_Period>
constexpr k_ticks_t to_tick(const std::chrono::duration<T_Rep, T_Period>& d) noexcept
{
  using namespace std::chrono;
 
  return k_ns_to_ticks_floor64(duration_cast<nanoseconds>(d).count());
}
 
 
template<class T_Rep, class T_Period>
constexpr k_timeout_t to_timeout(const std::chrono::duration<T_Rep, T_Period>& d) noexcept
{
  return { to_tick(d) };
}
 
} // namespace zpp
 
#endif // ZPP_INCLUDE_ZPP_CLOCK_HPP