AVR

High-Precision Timing Library for AVR

This lightweight library is specifically designed for millisecond-level time tracking. It supports the “unsigned long long” data type, allowing it to accurately track up to 584.9 million years! Additionally, it can adapt to clock frequencies of up to 20MHz, with most common frequencies having no timing errors.

Compared to Arduino’s built-in millis() timer, this library is especially useful when running at clock frequencies of 8MHz or below or when tracking time for more than 50 days.

Download from GitHub

Brief comparison against the Arduino millis()

Arduino millis()

• Microsecond support
• Doesn’t loose or gain time at any clock frequency
• Loss of resolution at lower frequencies

This library

• Faster execution
• Less RAM used
• Always updates millisecond count every millisecond
• Support for ‘unsigned long long’ data type, 64 bit integer allows tracking time for up to 584.9 million years, Arduino millis() uses ‘unsigned long’ which goes up to 49.71 days
• Uses CTC mode for the timer, which might make it a little bit more difficult to use the timer for multiple things

Accuracy at commonly used clock frequencies