/home/travis/build/larsks/pipower/millis.c File Reference

Provide an analog of the Arduino millis() function. More...

#include <avr/interrupt.h>
#include <avr/io.h>
#include <util/atomic.h>

Functions
	ISR (TIMER0_COMPA_vect)
	Timer interrupt service routine. More...
void	init_millis ()
	Initialize the millis service. More...
unsigned long	millis ()
	Return milliseconds since mc boot. More...

Variables
volatile unsigned long	timer_millis = 0

Detailed Description

Provide an analog of the Arduino millis() function.

This implementation uses TIMER0 with a /64 divider, which will allow it to operate with a clock frequency of up to 16Mhz.

Function Documentation

void init_millis

(

)

Initialize the millis service.

Configure timer 0 in CTC mode. See the attiny85 datasheet for more information.

ISR

(

TIMER0_COMPA_vect

)

Timer interrupt service routine.

This fires each time the timer counter (TCNT0) reaches the target value stored in OCR0A.

unsigned long millis

(

)

Return milliseconds since mc boot.