get_uptime_ms.cpp

/*
 * uuid-common - Microcontroller common utilities
 * Copyright 2019,2022  Simon Arlott
 *
 * 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 <uuid/common.h>
 
#include <Arduino.h>
#if defined(ARDUINO_ARCH_ESP32)
# include <esp_timer.h>
#elif UUID_COMMON_THREAD_SAFE
# include <mutex>
#endif
 
namespace uuid {
 
uint64_t get_uptime_ms() {
#if defined(ARDUINO_ARCH_ESP32)
    return esp_timer_get_time() / 1000ULL;
#else
# if UUID_COMMON_THREAD_SAFE
    static std::mutex mutex;
# endif
    static uint32_t high_millis = 0;
    static uint32_t low_millis = 0;
 
    uint32_t now_millis = ::millis();
# if UUID_COMMON_THREAD_SAFE
    std::lock_guard<std::mutex> lock{mutex};
# endif
 
    if (now_millis < low_millis) {
        high_millis++;
    }
 
    low_millis = now_millis;
 
    return ((uint64_t)high_millis << 32) | low_millis;
#endif
}
 
} // namespace uuid