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Millis

This library allows you to use millis function like with Arduino. Millis function returns time in ms from the program start.

Implementation

  1. Add "millis.h", "millis_config.h" and "millis.c" files to your project
  2. Select Timer/Couter which you want to be used by millis library and assign the right number to the MILLIS_TC_NUM macro located in the "millis_config.h" file.
    • Timer/Counter0 -> 0, Timer/Counter1 -> 1

Hardware support:

ATtiny84A, ATtiny85, ATtiny88

  • It is possible to add another AVR MCUs, just add another conditional directives (#if defined(\_\_AVR\_*YOUR_DEVICE*\_\_)), assign the right registers and set the right OCREG_VALUE in millis_config.h file.

  • CPU clock is 8 MHz, but it is possible to implement different CPU clock, just set the right OCREG_VALUE and prescaler in millis_config.h file.

  • When running at 8 MHz, following settings are highly recommended:

    • 8-bit Timer/Counter: OCREG_VALUE = 124, prescaler = 64
    • 16-bit Timer/Counter: OCREG_VALUE = 7999, prescaler = 1

How to use

  • Execute millis_init() function to set registers and interrupts.

  • Then just call millis() function to get time in ms.

  • You can call resetMillis() to reset 32-bit millis counter to prevent variable overflow.

  • Make sure to execute sei() function to enable global interrupts.