get_uptime_ms.cpp
1 /*
2  * uuid-common - Microcontroller common utilities
3  * Copyright 2019 Simon Arlott
4  *
5  * This program is free software: you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation, either version 3 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program. If not, see <http://www.gnu.org/licenses/>.
17  */
18 
19 #include <uuid/common.h>
20 
21 #include <Arduino.h>
22 
23 namespace uuid {
24 
25 uint64_t get_uptime_ms() {
26  static uint32_t high_millis = 0;
27  static uint32_t low_millis = 0;
28 
29  uint32_t now_millis = ::millis();
30 
31  if (now_millis < low_millis) {
32  high_millis++;
33  }
34 
35  low_millis = now_millis;
36 
37  return ((uint64_t)high_millis << 32) | low_millis;
38 }
39 
40 } // namespace uuid
uint64_t get_uptime_ms()
Get the current uptime as a 64-bit milliseconds value.
Common utilities.