https://github.com/luni64/hiresclock

https://github.com/luni64/hiresclock

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• Host: GitHub
• URL: https://github.com/luni64/hiresclock
• Owner: luni64
• Created: 2022-06-29T13:22:27.000Z (over 2 years ago)
• Default Branch: master
• Last Pushed: 2024-04-24T06:02:44.000Z (7 months ago)
• Last Synced: 2024-04-24T13:19:31.173Z (7 months ago)
• Language: C++
• Size: 650 KB
• Stars: 2
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
## High Resolution Clock for 32bit ARM boards (currently implemented for Teensy 4.1 only)

The clock uses the main clock of a T4.x (600MHz) as time-base for a `std::chrono` compatible clock. Resolution is 1/600MHz = 1.66ns.

By default `HiResClock::begin()` synchronizes the clock with the RTC.

A few useless usage examples

```c++

#include "HiResClock.h"

using namespace std::chrono;

void setup()

{

    HiResClock::begin(); // start the clock and sync to rtc (works with and without battery)

    auto t0 = HiResClock::now();

    delay(1234);

    auto t1 = HiResClock::now();

    nanoseconds delta_in_ns = duration_cast(t1 - t0);

    Serial.printf("delta: %0.9fs\n", delta_in_ns.count() / 1E9);

    // transform current time to standard time_t value

    auto now = HiResClock::now();

    time_t t = HiResClock::to_time_t(now);

    Serial.print(ctime(&t));

}

auto then = HiResClock::now() + 10h;

void loop()

{

    if (HiResClock::now() < then)

    {

        Serial.println("still waiting...");

    };

    constexpr unsigned delaytime = duration_cast(0.34h + 2min + 3434ns).count(); // let the compiler calculate that

    delay(delaytime);

}

```